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Class yii\db\Query

Inheritanceyii\db\Query » yii\base\Component » yii\base\BaseObject
Implementsyii\base\Configurable, yii\db\ExpressionInterface, yii\db\QueryInterface
Uses Traitsyii\db\QueryTrait
Subclassesyii\db\ActiveQuery
Available since version2.0
Source Code https://github.com/yiisoft/yii2/blob/master/framework/db/Query.php

Query represents a SELECT SQL statement in a way that is independent of DBMS.

Query provides a set of methods to facilitate the specification of different clauses in a SELECT statement. These methods can be chained together.

By calling createCommand(), we can get a yii\db\Command instance which can be further used to perform/execute the DB query against a database.

For example,

$query = new Query;
// compose the query
$query->select('id, name')
    ->from('user')
    ->limit(10);
// build and execute the query
$rows = $query->all();
// alternatively, you can create DB command and execute it
$command = $query->createCommand();
// $command->sql returns the actual SQL
$rows = $command->queryAll();

Query internally uses the yii\db\QueryBuilder class to generate the SQL statement.

A more detailed usage guide on how to work with Query can be found in the guide article on Query Builder.

Public Properties

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Property Type Description Defined By
$behaviors yii\base\Behavior[] List of behaviors attached to this component. yii\base\Component
$distinct boolean Whether to select distinct rows of data only. yii\db\Query
$emulateExecution boolean Whether to emulate the actual query execution, returning empty or false results. yii\db\QueryTrait
$from array|null The table(s) to be selected from. yii\db\Query
$groupBy array|null How to group the query results. yii\db\Query
$having string|array|yii\db\ExpressionInterface|null The condition to be applied in the GROUP BY clause. yii\db\Query
$indexBy string|callable|null The name of the column by which the query results should be indexed by. yii\db\QueryTrait
$join array|null How to join with other tables. yii\db\Query
$limit integer|yii\db\ExpressionInterface|null Maximum number of records to be returned. yii\db\QueryTrait
$offset integer|yii\db\ExpressionInterface|null Zero-based offset from where the records are to be returned. yii\db\QueryTrait
$orderBy array|null How to sort the query results. yii\db\QueryTrait
$params array|null List of query parameter values indexed by parameter placeholders. yii\db\Query
$queryCacheDependency yii\caching\Dependency|null The dependency to be associated with the cached query result for this query yii\db\Query
$queryCacheDuration integer|boolean|null The default number of seconds that query results can remain valid in cache. yii\db\Query
$select array|null The columns being selected. yii\db\Query
$selectOption string|null Additional option that should be appended to the 'SELECT' keyword. yii\db\Query
$tablesUsedInFrom string[] Table names indexed by aliases. yii\db\Query
$union array|null This is used to construct the UNION clause(s) in a SQL statement. yii\db\Query
$where string|array|yii\db\ExpressionInterface|null Query condition. yii\db\QueryTrait
$withQueries array|null This is used to construct the WITH section in a SQL query. yii\db\Query

Public Methods

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Method Description Defined By
__call() Calls the named method which is not a class method. yii\base\Component
__clone() This method is called after the object is created by cloning an existing one. yii\base\Component
__construct() Constructor. yii\base\BaseObject
__get() Returns the value of a component property. yii\base\Component
__isset() Checks if a property is set, i.e. defined and not null. yii\base\Component
__set() Sets the value of a component property. yii\base\Component
__toString() Returns the SQL representation of Query yii\db\Query
__unset() Sets a component property to be null. yii\base\Component
addGroupBy() Adds additional group-by columns to the existing ones. yii\db\Query
addOrderBy() Adds additional ORDER BY columns to the query. yii\db\QueryTrait
addParams() Adds additional parameters to be bound to the query. yii\db\Query
addSelect() Add more columns to the SELECT part of the query. yii\db\Query
all() Executes the query and returns all results as an array. yii\db\Query
andFilterCompare() Adds a filtering condition for a specific column and allow the user to choose a filter operator. yii\db\Query
andFilterHaving() Adds an additional HAVING condition to the existing one but ignores empty operands. yii\db\Query
andFilterWhere() Adds an additional WHERE condition to the existing one but ignores empty operands. yii\db\QueryTrait
andHaving() Adds an additional HAVING condition to the existing one. yii\db\Query
andWhere() Adds an additional WHERE condition to the existing one. yii\db\Query
attachBehavior() Attaches a behavior to this component. yii\base\Component
attachBehaviors() Attaches a list of behaviors to the component. yii\base\Component
average() Returns the average of the specified column values. yii\db\Query
batch() Starts a batch query. yii\db\Query
behaviors() Returns a list of behaviors that this component should behave as. yii\base\Component
cache() Enables query cache for this Query. yii\db\Query
canGetProperty() Returns a value indicating whether a property can be read. yii\base\Component
canSetProperty() Returns a value indicating whether a property can be set. yii\base\Component
className() Returns the fully qualified name of this class. yii\base\BaseObject
column() Executes the query and returns the first column of the result. yii\db\Query
count() Returns the number of records. yii\db\Query
create() Creates a new Query object and copies its property values from an existing one. yii\db\Query
createCommand() Creates a DB command that can be used to execute this query. yii\db\Query
detachBehavior() Detaches a behavior from the component. yii\base\Component
detachBehaviors() Detaches all behaviors from the component. yii\base\Component
distinct() Sets the value indicating whether to SELECT DISTINCT or not. yii\db\Query
each() Starts a batch query and retrieves data row by row. yii\db\Query
emulateExecution() Sets whether to emulate query execution, preventing any interaction with data storage. yii\db\QueryTrait
ensureBehaviors() Makes sure that the behaviors declared in behaviors() are attached to this component. yii\base\Component
exists() Returns a value indicating whether the query result contains any row of data. yii\db\Query
filterHaving() Sets the HAVING part of the query but ignores empty operands. yii\db\Query
filterWhere() Sets the WHERE part of the query but ignores empty operands. yii\db\QueryTrait
from() Sets the FROM part of the query. yii\db\Query
getBehavior() Returns the named behavior object. yii\base\Component
getBehaviors() Returns all behaviors attached to this component. yii\base\Component
getTablesUsedInFrom() Returns table names used in from() indexed by aliases. yii\db\Query
groupBy() Sets the GROUP BY part of the query. yii\db\Query
hasEventHandlers() Returns a value indicating whether there is any handler attached to the named event. yii\base\Component
hasMethod() Returns a value indicating whether a method is defined. yii\base\Component
hasProperty() Returns a value indicating whether a property is defined for this component. yii\base\Component
having() Sets the HAVING part of the query. yii\db\Query
indexBy() Sets the indexBy() property. yii\db\QueryTrait
init() Initializes the object. yii\base\BaseObject
innerJoin() Appends an INNER JOIN part to the query. yii\db\Query
join() Appends a JOIN part to the query. yii\db\Query
leftJoin() Appends a LEFT OUTER JOIN part to the query. yii\db\Query
limit() Sets the LIMIT part of the query. yii\db\QueryTrait
max() Returns the maximum of the specified column values. yii\db\Query
min() Returns the minimum of the specified column values. yii\db\Query
noCache() Disables query cache for this Query. yii\db\Query
off() Detaches an existing event handler from this component. yii\base\Component
offset() Sets the OFFSET part of the query. yii\db\QueryTrait
on() Attaches an event handler to an event. yii\base\Component
one() Executes the query and returns a single row of result. yii\db\Query
orFilterHaving() Adds an additional HAVING condition to the existing one but ignores empty operands. yii\db\Query
orFilterWhere() Adds an additional WHERE condition to the existing one but ignores empty operands. yii\db\QueryTrait
orHaving() Adds an additional HAVING condition to the existing one. yii\db\Query
orWhere() Adds an additional WHERE condition to the existing one. yii\db\Query
orderBy() Sets the ORDER BY part of the query. yii\db\QueryTrait
params() Sets the parameters to be bound to the query. yii\db\Query
populate() Converts the raw query results into the format as specified by this query. yii\db\Query
prepare() Prepares for building SQL. yii\db\Query
rightJoin() Appends a RIGHT OUTER JOIN part to the query. yii\db\Query
scalar() Returns the query result as a scalar value. yii\db\Query
select() Sets the SELECT part of the query. yii\db\Query
sum() Returns the sum of the specified column values. yii\db\Query
trigger() Triggers an event. yii\base\Component
union() Appends a SQL statement using UNION operator. yii\db\Query
where() Sets the WHERE part of the query. yii\db\Query
withQuery() Prepends a SQL statement using WITH syntax. yii\db\Query

Protected Methods

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Method Description Defined By
cleanUpTableNames() Clean up table names and aliases Both aliases and names are enclosed into {{ and }}. yii\db\Query
filterCondition() Removes empty operands from the given query condition. yii\db\QueryTrait
getUnaliasedColumnsFromSelect() yii\db\Query
getUniqueColumns() Returns unique column names excluding duplicates. yii\db\Query
isEmpty() Returns a value indicating whether the give value is "empty". yii\db\QueryTrait
normalizeOrderBy() Normalizes format of ORDER BY data. yii\db\QueryTrait
normalizeSelect() Normalizes the SELECT columns passed to select() or addSelect(). yii\db\Query
queryScalar() Queries a scalar value by setting select() first. yii\db\Query
setCommandCache() Sets $command cache, if this query has enabled caching. yii\db\Query

Property Details

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$distinct public property

Whether to select distinct rows of data only. If this is set true, the SELECT clause would be changed to SELECT DISTINCT.

public boolean $distinct false
$from public property

The table(s) to be selected from. For example, ['user', 'post']. This is used to construct the FROM clause in a SQL statement.

See also from().

public array|null $from null
$groupBy public property

How to group the query results. For example, ['company', 'department']. This is used to construct the GROUP BY clause in a SQL statement.

public array|null $groupBy null
$having public property

The condition to be applied in the GROUP BY clause. It can be either a string or an array. Please refer to where() on how to specify the condition.

$join public property

How to join with other tables. Each array element represents the specification of one join which has the following structure:

[$joinType, $tableName, $joinCondition]

For example,

[
    ['INNER JOIN', 'user', 'user.id = author_id'],
    ['LEFT JOIN', 'team', 'team.id = team_id'],
]
public array|null $join null
$params public property

List of query parameter values indexed by parameter placeholders. For example, [':name' => 'Dan', ':age' => 31].

public array|null $params = []
$queryCacheDependency public property (available since version 2.0.14)

The dependency to be associated with the cached query result for this query

See also cache().

$queryCacheDuration public property (available since version 2.0.14)

The default number of seconds that query results can remain valid in cache. Use 0 to indicate that the cached data will never expire. Use a negative number to indicate that query cache should not be used. Use boolean true to indicate that yii\db\Connection::$queryCacheDuration should be used.

See also cache().

$select public property

The columns being selected. For example, ['id', 'name']. This is used to construct the SELECT clause in a SQL statement. If not set, it means selecting all columns.

See also select().

public array|null $select null
$selectOption public property

Additional option that should be appended to the 'SELECT' keyword. For example, in MySQL, the option 'SQL_CALC_FOUND_ROWS' can be used.

public string|null $selectOption null
$tablesUsedInFrom public property

Table names indexed by aliases.

public string[] $tablesUsedInFrom null
$union public property

This is used to construct the UNION clause(s) in a SQL statement. Each array element is an array of the following structure:

  • query: either a string or a yii\db\Query object representing a query
  • all: boolean, whether it should be UNION ALL or UNION
public array|null $union null
$withQueries public property (available since version 2.0.35)

This is used to construct the WITH section in a SQL query. Each array element is an array of the following structure:

  • query: either a string or a yii\db\Query object representing a query
  • alias: string, alias of query for further usage
  • recursive: boolean, whether it should be WITH RECURSIVE or WITH

See also withQuery().

public array|null $withQueries null

Method Details

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__call() public method

Defined in: yii\base\Component::__call()

Calls the named method which is not a class method.

This method will check if any attached behavior has the named method and will execute it if available.

Do not call this method directly as it is a PHP magic method that will be implicitly called when an unknown method is being invoked.

public mixed __call ( $name, $params )
$name string

The method name

$params array

Method parameters

return mixed

The method return value

throws yii\base\UnknownMethodException

when calling unknown method

                public function __call($name, $params)
{
    $this->ensureBehaviors();
    foreach ($this->_behaviors as $object) {
        if ($object->hasMethod($name)) {
            return call_user_func_array([$object, $name], $params);
        }
    }
    throw new UnknownMethodException('Calling unknown method: ' . get_class($this) . "::$name()");
}

            
__clone() public method

Defined in: yii\base\Component::__clone()

This method is called after the object is created by cloning an existing one.

It removes all behaviors because they are attached to the old object.

public void __clone ( )

                public function __clone()
{
    $this->_events = [];
    $this->_eventWildcards = [];
    $this->_behaviors = null;
}

            
__construct() public method

Defined in: yii\base\BaseObject::__construct()

Constructor.

The default implementation does two things:

  • Initializes the object with the given configuration $config.
  • Call init().

If this method is overridden in a child class, it is recommended that

  • the last parameter of the constructor is a configuration array, like $config here.
  • call the parent implementation at the end of the constructor.
public void __construct ( $config = [] )
$config array

Name-value pairs that will be used to initialize the object properties

                public function __construct($config = [])
{
    if (!empty($config)) {
        Yii::configure($this, $config);
    }
    $this->init();
}

            
__get() public method

Defined in: yii\base\Component::__get()

Returns the value of a component property.

This method will check in the following order and act accordingly:

  • a property defined by a getter: return the getter result
  • a property of a behavior: return the behavior property value

Do not call this method directly as it is a PHP magic method that will be implicitly called when executing $value = $component->property;.

See also __set().

public mixed __get ( $name )
$name string

The property name

return mixed

The property value or the value of a behavior's property

throws yii\base\UnknownPropertyException

if the property is not defined

throws yii\base\InvalidCallException

if the property is write-only.

                public function __get($name)
{
    $getter = 'get' . $name;
    if (method_exists($this, $getter)) {
        // read property, e.g. getName()
        return $this->$getter();
    }
    // behavior property
    $this->ensureBehaviors();
    foreach ($this->_behaviors as $behavior) {
        if ($behavior->canGetProperty($name)) {
            return $behavior->$name;
        }
    }
    if (method_exists($this, 'set' . $name)) {
        throw new InvalidCallException('Getting write-only property: ' . get_class($this) . '::' . $name);
    }
    throw new UnknownPropertyException('Getting unknown property: ' . get_class($this) . '::' . $name);
}

            
__isset() public method

Defined in: yii\base\Component::__isset()

Checks if a property is set, i.e. defined and not null.

This method will check in the following order and act accordingly:

  • a property defined by a setter: return whether the property is set
  • a property of a behavior: return whether the property is set
  • return false for non existing properties

Do not call this method directly as it is a PHP magic method that will be implicitly called when executing isset($component->property).

See also https://www.php.net/manual/en/function.isset.php.

public boolean __isset ( $name )
$name string

The property name or the event name

return boolean

Whether the named property is set

                public function __isset($name)
{
    $getter = 'get' . $name;
    if (method_exists($this, $getter)) {
        return $this->$getter() !== null;
    }
    // behavior property
    $this->ensureBehaviors();
    foreach ($this->_behaviors as $behavior) {
        if ($behavior->canGetProperty($name)) {
            return $behavior->$name !== null;
        }
    }
    return false;
}

            
__set() public method

Defined in: yii\base\Component::__set()

Sets the value of a component property.

This method will check in the following order and act accordingly:

  • a property defined by a setter: set the property value
  • an event in the format of "on xyz": attach the handler to the event "xyz"
  • a behavior in the format of "as xyz": attach the behavior named as "xyz"
  • a property of a behavior: set the behavior property value

Do not call this method directly as it is a PHP magic method that will be implicitly called when executing $component->property = $value;.

See also __get().

public void __set ( $name, $value )
$name string

The property name or the event name

$value mixed

The property value

throws yii\base\UnknownPropertyException

if the property is not defined

throws yii\base\InvalidCallException

if the property is read-only.

                public function __set($name, $value)
{
    $setter = 'set' . $name;
    if (method_exists($this, $setter)) {
        // set property
        $this->$setter($value);
        return;
    } elseif (strncmp($name, 'on ', 3) === 0) {
        // on event: attach event handler
        $this->on(trim(substr($name, 3)), $value);
        return;
    } elseif (strncmp($name, 'as ', 3) === 0) {
        // as behavior: attach behavior
        $name = trim(substr($name, 3));
        $this->attachBehavior($name, $value instanceof Behavior ? $value : Yii::createObject($value));
        return;
    }
    // behavior property
    $this->ensureBehaviors();
    foreach ($this->_behaviors as $behavior) {
        if ($behavior->canSetProperty($name)) {
            $behavior->$name = $value;
            return;
        }
    }
    if (method_exists($this, 'get' . $name)) {
        throw new InvalidCallException('Setting read-only property: ' . get_class($this) . '::' . $name);
    }
    throw new UnknownPropertyException('Setting unknown property: ' . get_class($this) . '::' . $name);
}

            
__toString() public method

Returns the SQL representation of Query

public string __toString ( )

                public function __toString()
{
    return serialize($this);
}

            
__unset() public method

Defined in: yii\base\Component::__unset()

Sets a component property to be null.

This method will check in the following order and act accordingly:

  • a property defined by a setter: set the property value to be null
  • a property of a behavior: set the property value to be null

Do not call this method directly as it is a PHP magic method that will be implicitly called when executing unset($component->property).

See also https://www.php.net/manual/en/function.unset.php.

public void __unset ( $name )
$name string

The property name

throws yii\base\InvalidCallException

if the property is read only.

                public function __unset($name)
{
    $setter = 'set' . $name;
    if (method_exists($this, $setter)) {
        $this->$setter(null);
        return;
    }
    // behavior property
    $this->ensureBehaviors();
    foreach ($this->_behaviors as $behavior) {
        if ($behavior->canSetProperty($name)) {
            $behavior->$name = null;
            return;
        }
    }
    throw new InvalidCallException('Unsetting an unknown or read-only property: ' . get_class($this) . '::' . $name);
}

            
addGroupBy() public method

Adds additional group-by columns to the existing ones.

See also groupBy().

public $this addGroupBy ( $columns )
$columns string|array|yii\db\ExpressionInterface

Additional columns to be grouped by. Columns can be specified in either a string (e.g. "id, name") or an array (e.g. ['id', 'name']). The method will automatically quote the column names unless a column contains some parenthesis (which means the column contains a DB expression).

Note that if your group-by is an expression containing commas, you should always use an array to represent the group-by information. Otherwise, the method will not be able to correctly determine the group-by columns.

Since version 2.0.7, an yii\db\Expression object can be passed to specify the GROUP BY part explicitly in plain SQL. Since version 2.0.14, an yii\db\ExpressionInterface object can be passed as well.

return $this

The query object itself

                public function addGroupBy($columns)
{
    if ($columns instanceof ExpressionInterface) {
        $columns = [$columns];
    } elseif (!is_array($columns)) {
        $columns = preg_split('/\s*,\s*/', trim($columns), -1, PREG_SPLIT_NO_EMPTY);
    }
    if ($this->groupBy === null) {
        $this->groupBy = $columns;
    } else {
        $this->groupBy = array_merge($this->groupBy, $columns);
    }
    return $this;
}

            
addOrderBy() public method

Defined in: yii\db\QueryTrait::addOrderBy()

Adds additional ORDER BY columns to the query.

See also orderBy().

public $this addOrderBy ( $columns )
$columns string|array|yii\db\ExpressionInterface

The columns (and the directions) to be ordered by. Columns can be specified in either a string (e.g. "id ASC, name DESC") or an array (e.g. ['id' => SORT_ASC, 'name' => SORT_DESC]).

The method will automatically quote the column names unless a column contains some parenthesis (which means the column contains a DB expression).

Note that if your order-by is an expression containing commas, you should always use an array to represent the order-by information. Otherwise, the method will not be able to correctly determine the order-by columns.

Since version 2.0.7, an yii\db\ExpressionInterface object can be passed to specify the ORDER BY part explicitly in plain SQL.

return $this

The query object itself

                public function addOrderBy($columns)
{
    $columns = $this->normalizeOrderBy($columns);
    if ($this->orderBy === null) {
        $this->orderBy = $columns;
    } else {
        $this->orderBy = array_merge($this->orderBy, $columns);
    }
    return $this;
}

            
addParams() public method

Adds additional parameters to be bound to the query.

See also params().

public $this addParams ( $params )
$params array

List of query parameter values indexed by parameter placeholders. For example, [':name' => 'Dan', ':age' => 31].

return $this

The query object itself

                public function addParams($params)
{
    if (!empty($params)) {
        if (empty($this->params)) {
            $this->params = $params;
        } else {
            foreach ($params as $name => $value) {
                if (is_int($name)) {
                    $this->params[] = $value;
                } else {
                    $this->params[$name] = $value;
                }
            }
        }
    }
    return $this;
}

            
addSelect() public method

Add more columns to the SELECT part of the query.

Note, that if select() has not been specified before, you should include * explicitly if you want to select all remaining columns too:

$query->addSelect(["*", "CONCAT(first_name, ' ', last_name) AS full_name"])->one();

See also select().

public $this addSelect ( $columns )
$columns string|array|yii\db\ExpressionInterface

The columns to add to the select. See select() for more details about the format of this parameter.

return $this

The query object itself

                public function addSelect($columns)
{
    if ($this->select === null) {
        return $this->select($columns);
    }
    if (!is_array($this->select)) {
        $this->select = $this->normalizeSelect($this->select);
    }
    $this->select = array_merge($this->select, $this->normalizeSelect($columns));
    return $this;
}

            
all() public method

Executes the query and returns all results as an array.

public array all ( $db null )
$db yii\db\Connection|null

The database connection used to generate the SQL statement. If this parameter is not given, the db application component will be used.

return array

The query results. If the query results in nothing, an empty array will be returned.

                public function all($db = null)
{
    if ($this->emulateExecution) {
        return [];
    }
    $rows = $this->createCommand($db)->queryAll();
    return $this->populate($rows);
}

            
andFilterCompare() public method (available since version 2.0.8)

Adds a filtering condition for a specific column and allow the user to choose a filter operator.

It adds an additional WHERE condition for the given field and determines the comparison operator based on the first few characters of the given value. The condition is added in the same way as in andFilterWhere() so empty values are ignored. The new condition and the existing one will be joined using the AND operator.

The comparison operator is intelligently determined based on the first few characters in the given value. In particular, it recognizes the following operators if they appear as the leading characters in the given value:

  • <: the column must be less than the given value.
  • >: the column must be greater than the given value.
  • <=: the column must be less than or equal to the given value.
  • >=: the column must be greater than or equal to the given value.
  • <>: the column must not be the same as the given value.
  • =: the column must be equal to the given value.
  • If none of the above operators is detected, the $defaultOperator will be used.
public $this andFilterCompare ( $name, $value, $defaultOperator '=' )
$name string

The column name.

$value string

The column value optionally prepended with the comparison operator.

$defaultOperator string

The operator to use, when no operator is given in $value. Defaults to =, performing an exact match.

return $this

The query object itself

                public function andFilterCompare($name, $value, $defaultOperator = '=')
{
    if (preg_match('/^(<>|>=|>|<=|<|=)/', (string)$value, $matches)) {
        $operator = $matches[1];
        $value = substr($value, strlen($operator));
    } else {
        $operator = $defaultOperator;
    }
    return $this->andFilterWhere([$operator, $name, $value]);
}

            
andFilterHaving() public method (available since version 2.0.11)

Adds an additional HAVING condition to the existing one but ignores empty operands.

The new condition and the existing one will be joined using the AND operator.

This method is similar to andHaving(). The main difference is that this method will remove empty query operands. As a result, this method is best suited for building query conditions based on filter values entered by users.

See also:

public $this andFilterHaving ( array $condition )
$condition array

The new HAVING condition. Please refer to having() on how to specify this parameter.

return $this

The query object itself

                public function andFilterHaving(array $condition)
{
    $condition = $this->filterCondition($condition);
    if ($condition !== []) {
        $this->andHaving($condition);
    }
    return $this;
}

            
andFilterWhere() public method

Defined in: yii\db\QueryTrait::andFilterWhere()

Adds an additional WHERE condition to the existing one but ignores empty operands.

The new condition and the existing one will be joined using the 'AND' operator.

This method is similar to andWhere(). The main difference is that this method will remove empty query operands. As a result, this method is best suited for building query conditions based on filter values entered by users.

See also:

public $this andFilterWhere ( array $condition )
$condition array

The new WHERE condition. Please refer to where() on how to specify this parameter.

return $this

The query object itself

                public function andFilterWhere(array $condition)
{
    $condition = $this->filterCondition($condition);
    if ($condition !== []) {
        $this->andWhere($condition);
    }
    return $this;
}

            
andHaving() public method

Adds an additional HAVING condition to the existing one.

The new condition and the existing one will be joined using the AND operator.

See also:

public $this andHaving ( $condition, $params = [] )
$condition string|array|yii\db\ExpressionInterface

The new HAVING condition. Please refer to where() on how to specify this parameter.

$params array

The parameters (name => value) to be bound to the query.

return $this

The query object itself

                public function andHaving($condition, $params = [])
{
    if ($this->having === null) {
        $this->having = $condition;
    } else {
        $this->having = ['and', $this->having, $condition];
    }
    $this->addParams($params);
    return $this;
}

            
andWhere() public method

Adds an additional WHERE condition to the existing one.

The new condition and the existing one will be joined using the AND operator.

See also:

public $this andWhere ( $condition, $params = [] )
$condition string|array|yii\db\ExpressionInterface

The new WHERE condition. Please refer to where() on how to specify this parameter.

$params array

The parameters (name => value) to be bound to the query.

return $this

The query object itself

                public function andWhere($condition, $params = [])
{
    if ($this->where === null) {
        $this->where = $condition;
    } elseif (is_array($this->where) && isset($this->where[0]) && strcasecmp($this->where[0], 'and') === 0) {
        $this->where[] = $condition;
    } else {
        $this->where = ['and', $this->where, $condition];
    }
    $this->addParams($params);
    return $this;
}

            
attachBehavior() public method

Defined in: yii\base\Component::attachBehavior()

Attaches a behavior to this component.

This method will create the behavior object based on the given configuration. After that, the behavior object will be attached to this component by calling the yii\base\Behavior::attach() method.

See also detachBehavior().

public yii\base\Behavior attachBehavior ( $name, $behavior )
$name string

The name of the behavior.

$behavior string|array|yii\base\Behavior

The behavior configuration. This can be one of the following:

return yii\base\Behavior

The behavior object

                public function attachBehavior($name, $behavior)
{
    $this->ensureBehaviors();
    return $this->attachBehaviorInternal($name, $behavior);
}

            
attachBehaviors() public method

Defined in: yii\base\Component::attachBehaviors()

Attaches a list of behaviors to the component.

Each behavior is indexed by its name and should be a yii\base\Behavior object, a string specifying the behavior class, or an configuration array for creating the behavior.

See also attachBehavior().

public void attachBehaviors ( $behaviors )
$behaviors array

List of behaviors to be attached to the component

                public function attachBehaviors($behaviors)
{
    $this->ensureBehaviors();
    foreach ($behaviors as $name => $behavior) {
        $this->attachBehaviorInternal($name, $behavior);
    }
}

            
average() public method

Returns the average of the specified column values.

public mixed average ( $q, $db null )
$q string

The column name or expression. Make sure you properly quote column names in the expression.

$db yii\db\Connection|null

The database connection used to generate the SQL statement. If this parameter is not given, the db application component will be used.

return mixed

The average of the specified column values.

                public function average($q, $db = null)
{
    if ($this->emulateExecution) {
        return 0;
    }
    return $this->queryScalar("AVG($q)", $db);
}

            
batch() public method

Starts a batch query.

A batch query supports fetching data in batches, which can keep the memory usage under a limit. This method will return a yii\db\BatchQueryResult object which implements the Iterator interface and can be traversed to retrieve the data in batches.

For example,

$query = (new Query)->from('user');
foreach ($query->batch() as $rows) {
    // $rows is an array of 100 or fewer rows from user table
}
public yii\db\BatchQueryResult batch ( $batchSize 100, $db null )
$batchSize integer

The number of records to be fetched in each batch.

$db yii\db\Connection|null

The database connection. If not set, the "db" application component will be used.

return yii\db\BatchQueryResult

The batch query result. It implements the Iterator interface and can be traversed to retrieve the data in batches.

                public function batch($batchSize = 100, $db = null)
{
    return Yii::createObject([
        'class' => BatchQueryResult::className(),
        'query' => $this,
        'batchSize' => $batchSize,
        'db' => $db,
        'each' => false,
    ]);
}

            
behaviors() public method

Defined in: yii\base\Component::behaviors()

Returns a list of behaviors that this component should behave as.

Child classes may override this method to specify the behaviors they want to behave as.

The return value of this method should be an array of behavior objects or configurations indexed by behavior names. A behavior configuration can be either a string specifying the behavior class or an array of the following structure:

'behaviorName' => [
    'class' => 'BehaviorClass',
    'property1' => 'value1',
    'property2' => 'value2',
]

Note that a behavior class must extend from yii\base\Behavior. Behaviors can be attached using a name or anonymously. When a name is used as the array key, using this name, the behavior can later be retrieved using getBehavior() or be detached using detachBehavior(). Anonymous behaviors can not be retrieved or detached.

Behaviors declared in this method will be attached to the component automatically (on demand).

public array behaviors ( )
return array

The behavior configurations.

                public function behaviors()
{
    return [];
}

            
cache() public method (available since version 2.0.14)

Enables query cache for this Query.

public $this cache ( $duration true, $dependency null )
$duration integer|true

The number of seconds that query results can remain valid in cache. Use 0 to indicate that the cached data will never expire. Use a negative number to indicate that query cache should not be used. Use boolean true to indicate that yii\db\Connection::$queryCacheDuration should be used. Defaults to true.

$dependency yii\caching\Dependency|null

The cache dependency associated with the cached result.

return $this

The Query object itself

                public function cache($duration = true, $dependency = null)
{
    $this->queryCacheDuration = $duration;
    $this->queryCacheDependency = $dependency;
    return $this;
}

            
canGetProperty() public method

Defined in: yii\base\Component::canGetProperty()

Returns a value indicating whether a property can be read.

A property can be read if:

  • the class has a getter method associated with the specified name (in this case, property name is case-insensitive);
  • the class has a member variable with the specified name (when $checkVars is true);
  • an attached behavior has a readable property of the given name (when $checkBehaviors is true).

See also canSetProperty().

public boolean canGetProperty ( $name, $checkVars true, $checkBehaviors true )
$name string

The property name

$checkVars boolean

Whether to treat member variables as properties

$checkBehaviors boolean

Whether to treat behaviors' properties as properties of this component

return boolean

Whether the property can be read

                public function canGetProperty($name, $checkVars = true, $checkBehaviors = true)
{
    if (method_exists($this, 'get' . $name) || $checkVars && property_exists($this, $name)) {
        return true;
    } elseif ($checkBehaviors) {
        $this->ensureBehaviors();
        foreach ($this->_behaviors as $behavior) {
            if ($behavior->canGetProperty($name, $checkVars)) {
                return true;
            }
        }
    }
    return false;
}

            
canSetProperty() public method

Defined in: yii\base\Component::canSetProperty()

Returns a value indicating whether a property can be set.

A property can be written if:

  • the class has a setter method associated with the specified name (in this case, property name is case-insensitive);
  • the class has a member variable with the specified name (when $checkVars is true);
  • an attached behavior has a writable property of the given name (when $checkBehaviors is true).

See also canGetProperty().

public boolean canSetProperty ( $name, $checkVars true, $checkBehaviors true )
$name string

The property name

$checkVars boolean

Whether to treat member variables as properties

$checkBehaviors boolean

Whether to treat behaviors' properties as properties of this component

return boolean

Whether the property can be written

                public function canSetProperty($name, $checkVars = true, $checkBehaviors = true)
{
    if (method_exists($this, 'set' . $name) || $checkVars && property_exists($this, $name)) {
        return true;
    } elseif ($checkBehaviors) {
        $this->ensureBehaviors();
        foreach ($this->_behaviors as $behavior) {
            if ($behavior->canSetProperty($name, $checkVars)) {
                return true;
            }
        }
    }
    return false;
}

            
className() public static method
Deprecated since 2.0.14. On PHP >=5.5, use ::class instead.

Defined in: yii\base\BaseObject::className()

Returns the fully qualified name of this class.

public static string className ( )
return string

The fully qualified name of this class.

                public static function className()
{
    return get_called_class();
}

            
cleanUpTableNames() protected method (available since version 2.0.14)

Clean up table names and aliases Both aliases and names are enclosed into {{ and }}.

protected string[] cleanUpTableNames ( $tableNames )
$tableNames array

Non-empty array

return string[]

Table names indexed by aliases

                protected function cleanUpTableNames($tableNames)
{
    $cleanedUpTableNames = [];
    foreach ($tableNames as $alias => $tableName) {
        if (is_string($tableName) && !is_string($alias)) {
            $pattern = <<<PATTERN
'"`\[]|{{)
'"`\]]|}})
?\)
\s+
(?:as)?
\s*
?:['"`\[]|{{)
.*?
(?:['"`\]]|}})
|
.*?

ERN;
            if (preg_match($pattern, $tableName, $matches)) {
                if (isset($matches[2])) {
                    list(, $tableName, $alias) = $matches;
                } else {
                    $tableName = $alias = $matches[1];
                }
            }
        }
        if ($tableName instanceof Expression) {
            if (!is_string($alias)) {
                throw new InvalidArgumentException('To use Expression in from() method, pass it in array format with alias.');
            }
            $cleanedUpTableNames[$this->ensureNameQuoted($alias)] = $tableName;
        } elseif ($tableName instanceof self) {
            $cleanedUpTableNames[$this->ensureNameQuoted($alias)] = $tableName;
        } else {
            $cleanedUpTableNames[$this->ensureNameQuoted($alias)] = $this->ensureNameQuoted($tableName);
        }
    }
    return $cleanedUpTableNames;
}

            
column() public method

Executes the query and returns the first column of the result.

public array column ( $db null )
$db yii\db\Connection|null

The database connection used to generate the SQL statement. If this parameter is not given, the db application component will be used.

return array

The first column of the query result. An empty array is returned if the query results in nothing.

                public function column($db = null)
{
    if ($this->emulateExecution) {
        return [];
    }
    if ($this->indexBy === null) {
        return $this->createCommand($db)->queryColumn();
    }
    if (is_string($this->indexBy) && is_array($this->select) && count($this->select) === 1) {
        if (strpos($this->indexBy, '.') === false && count($tables = $this->getTablesUsedInFrom()) > 0) {
            $this->select[] = key($tables) . '.' . $this->indexBy;
        } else {
            $this->select[] = $this->indexBy;
        }
    }
    $rows = $this->createCommand($db)->queryAll();
    $results = [];
    $column = null;
    if (is_string($this->indexBy)) {
        if (($dotPos = strpos($this->indexBy, '.')) === false) {
            $column = $this->indexBy;
        } else {
            $column = substr($this->indexBy, $dotPos + 1);
        }
    }
    foreach ($rows as $row) {
        $value = reset($row);
        if ($this->indexBy instanceof \Closure) {
            $results[call_user_func($this->indexBy, $row)] = $value;
        } else {
            $results[$row[$column]] = $value;
        }
    }
    return $results;
}

            
count() public method

Returns the number of records.

public integer|string|null count ( $q '*', $db null )
$q string

The COUNT expression. Defaults to '*'. Make sure you properly quote column names in the expression.

$db yii\db\Connection|null

The database connection used to generate the SQL statement. If this parameter is not given (or null), the db application component will be used.

return integer|string|null

Number of records. The result may be a string depending on the underlying database engine and to support integer values higher than a 32bit PHP integer can handle.

                public function count($q = '*', $db = null)
{
    if ($this->emulateExecution) {
        return 0;
    }
    return $this->queryScalar("COUNT($q)", $db);
}

            
create() public static method

Creates a new Query object and copies its property values from an existing one.

The properties being copies are the ones to be used by query builders.

public static yii\db\Query create ( $from )
$from yii\db\Query

The source query object

return yii\db\Query

The new Query object

                public static function create($from)
{
    return new self([
        'where' => $from->where,
        'limit' => $from->limit,
        'offset' => $from->offset,
        'orderBy' => $from->orderBy,
        'indexBy' => $from->indexBy,
        'select' => $from->select,
        'selectOption' => $from->selectOption,
        'distinct' => $from->distinct,
        'from' => $from->from,
        'groupBy' => $from->groupBy,
        'join' => $from->join,
        'having' => $from->having,
        'union' => $from->union,
        'params' => $from->params,
        'withQueries' => $from->withQueries,
    ]);
}

            
createCommand() public method

Creates a DB command that can be used to execute this query.

public yii\db\Command createCommand ( $db null )
$db yii\db\Connection|null

The database connection used to generate the SQL statement. If this parameter is not given, the db application component will be used.

return yii\db\Command

The created DB command instance.

                public function createCommand($db = null)
{
    if ($db === null) {
        $db = Yii::$app->getDb();
    }
    list($sql, $params) = $db->getQueryBuilder()->build($this);
    $command = $db->createCommand($sql, $params);
    $this->setCommandCache($command);
    return $command;
}

            
detachBehavior() public method

Defined in: yii\base\Component::detachBehavior()

Detaches a behavior from the component.

The behavior's yii\base\Behavior::detach() method will be invoked.

public yii\base\Behavior|null detachBehavior ( $name )
$name string

The behavior's name.

return yii\base\Behavior|null

The detached behavior. Null if the behavior does not exist.

                public function detachBehavior($name)
{
    $this->ensureBehaviors();
    if (isset($this->_behaviors[$name])) {
        $behavior = $this->_behaviors[$name];
        unset($this->_behaviors[$name]);
        $behavior->detach();
        return $behavior;
    }
    return null;
}

            
detachBehaviors() public method

Defined in: yii\base\Component::detachBehaviors()

Detaches all behaviors from the component.

public void detachBehaviors ( )

                public function detachBehaviors()
{
    $this->ensureBehaviors();
    foreach ($this->_behaviors as $name => $behavior) {
        $this->detachBehavior($name);
    }
}

            
distinct() public method

Sets the value indicating whether to SELECT DISTINCT or not.

public $this distinct ( $value true )
$value boolean

Whether to SELECT DISTINCT or not.

return $this

The query object itself

                public function distinct($value = true)
{
    $this->distinct = $value;
    return $this;
}

            
each() public method

Starts a batch query and retrieves data row by row.

This method is similar to batch() except that in each iteration of the result, only one row of data is returned. For example,

$query = (new Query)->from('user');
foreach ($query->each() as $row) {
}
public yii\db\BatchQueryResult each ( $batchSize 100, $db null )
$batchSize integer

The number of records to be fetched in each batch.

$db yii\db\Connection|null

The database connection. If not set, the "db" application component will be used.

return yii\db\BatchQueryResult

The batch query result. It implements the Iterator interface and can be traversed to retrieve the data in batches.

                public function each($batchSize = 100, $db = null)
{
    return Yii::createObject([
        'class' => BatchQueryResult::className(),
        'query' => $this,
        'batchSize' => $batchSize,
        'db' => $db,
        'each' => true,
    ]);
}

            
emulateExecution() public method (available since version 2.0.11)

Defined in: yii\db\QueryTrait::emulateExecution()

Sets whether to emulate query execution, preventing any interaction with data storage.

After this mode is enabled, methods, returning query results like yii\db\QueryInterface::one(), yii\db\QueryInterface::all(), yii\db\QueryInterface::exists() and so on, will return empty or false values. You should use this method in case your program logic indicates query should not return any results, like in case you set false where condition like 0=1.

public $this emulateExecution ( $value true )
$value boolean

Whether to prevent query execution.

return $this

The query object itself.

                public function emulateExecution($value = true)
{
    $this->emulateExecution = $value;
    return $this;
}

            
ensureBehaviors() public method

Defined in: yii\base\Component::ensureBehaviors()

Makes sure that the behaviors declared in behaviors() are attached to this component.

public void ensureBehaviors ( )

                public function ensureBehaviors()
{
    if ($this->_behaviors === null) {
        $this->_behaviors = [];
        foreach ($this->behaviors() as $name => $behavior) {
            $this->attachBehaviorInternal($name, $behavior);
        }
    }
}

            
exists() public method

Returns a value indicating whether the query result contains any row of data.

public boolean exists ( $db null )
$db yii\db\Connection|null

The database connection used to generate the SQL statement. If this parameter is not given, the db application component will be used.

return boolean

Whether the query result contains any row of data.

                public function exists($db = null)
{
    if ($this->emulateExecution) {
        return false;
    }
    $command = $this->createCommand($db);
    $params = $command->params;
    $command->setSql($command->db->getQueryBuilder()->selectExists($command->getSql()));
    $command->bindValues($params);
    return (bool) $command->queryScalar();
}

            
filterCondition() protected method

Defined in: yii\db\QueryTrait::filterCondition()

Removes empty operands from the given query condition.

protected array filterCondition ( $condition )
$condition array

The original condition

return array

The condition with empty operands removed.

throws yii\base\NotSupportedException

if the condition operator is not supported

                protected function filterCondition($condition)
{
    if (!is_array($condition)) {
        return $condition;
    }
    if (!isset($condition[0])) {
        // hash format: 'column1' => 'value1', 'column2' => 'value2', ...
        foreach ($condition as $name => $value) {
            if ($this->isEmpty($value)) {
                unset($condition[$name]);
            }
        }
        return $condition;
    }
    // operator format: operator, operand 1, operand 2, ...
    $operator = array_shift($condition);
    switch (strtoupper($operator)) {
        case 'NOT':
        case 'AND':
        case 'OR':
            foreach ($condition as $i => $operand) {
                $subCondition = $this->filterCondition($operand);
                if ($this->isEmpty($subCondition)) {
                    unset($condition[$i]);
                } else {
                    $condition[$i] = $subCondition;
                }
            }
            if (empty($condition)) {
                return [];
            }
            break;
        case 'BETWEEN':
        case 'NOT BETWEEN':
            if (array_key_exists(1, $condition) && array_key_exists(2, $condition)) {
                if ($this->isEmpty($condition[1]) || $this->isEmpty($condition[2])) {
                    return [];
                }
            }
            break;
        default:
            if (array_key_exists(1, $condition) && $this->isEmpty($condition[1])) {
                return [];
            }
    }
    array_unshift($condition, $operator);
    return $condition;
}

            
filterHaving() public method (available since version 2.0.11)

Sets the HAVING part of the query but ignores empty operands.

This method is similar to having(). The main difference is that this method will remove empty query operands. As a result, this method is best suited for building query conditions based on filter values entered by users.

The following code shows the difference between this method and having():

// HAVING `age`=:age
$query->filterHaving(['name' => null, 'age' => 20]);
// HAVING `age`=:age
$query->having(['age' => 20]);
// HAVING `name` IS NULL AND `age`=:age
$query->having(['name' => null, 'age' => 20]);

Note that unlike having(), you cannot pass binding parameters to this method.

See also:

public $this filterHaving ( array $condition )
$condition array

The conditions that should be put in the HAVING part. See having() on how to specify this parameter.

return $this

The query object itself

                public function filterHaving(array $condition)
{
    $condition = $this->filterCondition($condition);
    if ($condition !== []) {
        $this->having($condition);
    }
    return $this;
}

            
filterWhere() public method

Defined in: yii\db\QueryTrait::filterWhere()

Sets the WHERE part of the query but ignores empty operands.

This method is similar to where(). The main difference is that this method will remove empty query operands. As a result, this method is best suited for building query conditions based on filter values entered by users.

The following code shows the difference between this method and where():

// WHERE `age`=:age
$query->filterWhere(['name' => null, 'age' => 20]);
// WHERE `age`=:age
$query->where(['age' => 20]);
// WHERE `name` IS NULL AND `age`=:age
$query->where(['name' => null, 'age' => 20]);

Note that unlike where(), you cannot pass binding parameters to this method.

See also:

public $this filterWhere ( array $condition )
$condition array

The conditions that should be put in the WHERE part. See where() on how to specify this parameter.

return $this

The query object itself

                public function filterWhere(array $condition)
{
    $condition = $this->filterCondition($condition);
    if ($condition !== []) {
        $this->where($condition);
    }
    return $this;
}

            
from() public method

Sets the FROM part of the query.

public $this from ( $tables )
$tables string|array|yii\db\ExpressionInterface

The table(s) to be selected from. This can be either a string (e.g. 'user') or an array (e.g. ['user', 'profile']) specifying one or several table names. Table names can contain schema prefixes (e.g. 'public.user') and/or table aliases (e.g. 'user u'). The method will automatically quote the table names unless it contains some parenthesis (which means the table is given as a sub-query or DB expression).

When the tables are specified as an array, you may also use the array keys as the table aliases (if a table does not need alias, do not use a string key).

Use a Query object to represent a sub-query. In this case, the corresponding array key will be used as the alias for the sub-query.

To specify the FROM part in plain SQL, you may pass an instance of yii\db\ExpressionInterface.

Here are some examples:

// SELECT * FROM  `user` `u`, `profile`;
$query = (new \yii\db\Query)->from(['u' => 'user', 'profile']);

// SELECT * FROM (SELECT * FROM `user` WHERE `active` = 1) `activeusers`;
$subquery = (new \yii\db\Query)->from('user')->where(['active' => true])
$query = (new \yii\db\Query)->from(['activeusers' => $subquery]);

// subquery can also be a string with plain SQL wrapped in parenthesis
// SELECT * FROM (SELECT * FROM `user` WHERE `active` = 1) `activeusers`;
$subquery = "(SELECT * FROM `user` WHERE `active` = 1)";
$query = (new \yii\db\Query)->from(['activeusers' => $subquery]);
return $this

The query object itself

                public function from($tables)
{
    if ($tables instanceof ExpressionInterface) {
        $tables = [$tables];
    }
    if (is_string($tables)) {
        $tables = preg_split('/\s*,\s*/', trim($tables), -1, PREG_SPLIT_NO_EMPTY);
    }
    $this->from = $tables;
    return $this;
}

            
getBehavior() public method

Defined in: yii\base\Component::getBehavior()

Returns the named behavior object.

public yii\base\Behavior|null getBehavior ( $name )
$name string

The behavior name

return yii\base\Behavior|null

The behavior object, or null if the behavior does not exist

                public function getBehavior($name)
{
    $this->ensureBehaviors();
    return isset($this->_behaviors[$name]) ? $this->_behaviors[$name] : null;
}

            
getBehaviors() public method

Defined in: yii\base\Component::getBehaviors()

Returns all behaviors attached to this component.

public yii\base\Behavior[] getBehaviors ( )
return yii\base\Behavior[]

List of behaviors attached to this component

                public function getBehaviors()
{
    $this->ensureBehaviors();
    return $this->_behaviors;
}

            
getTablesUsedInFrom() public method (available since version 2.0.12)

Returns table names used in from() indexed by aliases.

Both aliases and names are enclosed into {{ and }}.

public string[] getTablesUsedInFrom ( )
return string[]

Table names indexed by aliases

throws yii\base\InvalidConfigException

                public function getTablesUsedInFrom()
{
    if (empty($this->from)) {
        return [];
    }
    if (is_array($this->from)) {
        $tableNames = $this->from;
    } elseif (is_string($this->from)) {
        $tableNames = preg_split('/\s*,\s*/', trim($this->from), -1, PREG_SPLIT_NO_EMPTY);
    } elseif ($this->from instanceof Expression) {
        $tableNames = [$this->from];
    } else {
        throw new InvalidConfigException(gettype($this->from) . ' in $from is not supported.');
    }
    return $this->cleanUpTableNames($tableNames);
}

            
getUnaliasedColumnsFromSelect() protected method (available since version 2.0.14)
Deprecated in 2.0.21

protected array getUnaliasedColumnsFromSelect ( )
return array

List of columns without aliases from SELECT statement.

                protected function getUnaliasedColumnsFromSelect()
{
    $result = [];
    if (is_array($this->select)) {
        foreach ($this->select as $name => $value) {
            if (is_int($name)) {
                $result[] = $value;
            }
        }
    }
    return array_unique($result);
}

            
getUniqueColumns() protected method (available since version 2.0.14)
Deprecated in 2.0.21

Returns unique column names excluding duplicates.

Columns to be removed:

  • if column definition already present in SELECT part with same alias
  • if column definition without alias already present in SELECT part without alias too
protected void getUniqueColumns ( $columns )
$columns array

The columns to be merged to the select.

                protected function getUniqueColumns($columns)
{
    $unaliasedColumns = $this->getUnaliasedColumnsFromSelect();
    $result = [];
    foreach ($columns as $columnAlias => $columnDefinition) {
        if (!$columnDefinition instanceof Query) {
            if (is_string($columnAlias)) {
                $existsInSelect = isset($this->select[$columnAlias]) && $this->select[$columnAlias] === $columnDefinition;
                if ($existsInSelect) {
                    continue;
                }
            } elseif (is_int($columnAlias)) {
                $existsInSelect = in_array($columnDefinition, $unaliasedColumns, true);
                $existsInResultSet = in_array($columnDefinition, $result, true);
                if ($existsInSelect || $existsInResultSet) {
                    continue;
                }
            }
        }
        $result[$columnAlias] = $columnDefinition;
    }
    return $result;
}

            
groupBy() public method

Sets the GROUP BY part of the query.

See also addGroupBy().

public $this groupBy ( $columns )
$columns string|array|yii\db\ExpressionInterface

The columns to be grouped by. Columns can be specified in either a string (e.g. "id, name") or an array (e.g. ['id', 'name']). The method will automatically quote the column names unless a column contains some parenthesis (which means the column contains a DB expression).

Note that if your group-by is an expression containing commas, you should always use an array to represent the group-by information. Otherwise, the method will not be able to correctly determine the group-by columns.

Since version 2.0.7, an yii\db\ExpressionInterface object can be passed to specify the GROUP BY part explicitly in plain SQL. Since version 2.0.14, an yii\db\ExpressionInterface object can be passed as well.

return $this

The query object itself

                public function groupBy($columns)
{
    if ($columns instanceof ExpressionInterface) {
        $columns = [$columns];
    } elseif (!is_array($columns)) {
        $columns = preg_split('/\s*,\s*/', trim($columns), -1, PREG_SPLIT_NO_EMPTY);
    }
    $this->groupBy = $columns;
    return $this;
}

            
hasEventHandlers() public method

Defined in: yii\base\Component::hasEventHandlers()

Returns a value indicating whether there is any handler attached to the named event.

public boolean hasEventHandlers ( $name )
$name string

The event name

return boolean

Whether there is any handler attached to the event.

                public function hasEventHandlers($name)
{
    $this->ensureBehaviors();
    if (!empty($this->_events[$name])) {
        return true;
    }
    foreach ($this->_eventWildcards as $wildcard => $handlers) {
        if (!empty($handlers) && StringHelper::matchWildcard($wildcard, $name)) {
            return true;
        }
    }
    return Event::hasHandlers($this, $name);
}

            
hasMethod() public method

Defined in: yii\base\Component::hasMethod()

Returns a value indicating whether a method is defined.

A method is defined if:

  • the class has a method with the specified name
  • an attached behavior has a method with the given name (when $checkBehaviors is true).
public boolean hasMethod ( $name, $checkBehaviors true )
$name string

The property name

$checkBehaviors boolean

Whether to treat behaviors' methods as methods of this component

return boolean

Whether the method is defined

                public function hasMethod($name, $checkBehaviors = true)
{
    if (method_exists($this, $name)) {
        return true;
    } elseif ($checkBehaviors) {
        $this->ensureBehaviors();
        foreach ($this->_behaviors as $behavior) {
            if ($behavior->hasMethod($name)) {
                return true;
            }
        }
    }
    return false;
}

            
hasProperty() public method

Defined in: yii\base\Component::hasProperty()

Returns a value indicating whether a property is defined for this component.

A property is defined if:

  • the class has a getter or setter method associated with the specified name (in this case, property name is case-insensitive);
  • the class has a member variable with the specified name (when $checkVars is true);
  • an attached behavior has a property of the given name (when $checkBehaviors is true).

See also:

public boolean hasProperty ( $name, $checkVars true, $checkBehaviors true )
$name string

The property name

$checkVars boolean

Whether to treat member variables as properties

$checkBehaviors boolean

Whether to treat behaviors' properties as properties of this component

return boolean

Whether the property is defined

                public function hasProperty($name, $checkVars = true, $checkBehaviors = true)
{
    return $this->canGetProperty($name, $checkVars, $checkBehaviors) || $this->canSetProperty($name, false, $checkBehaviors);
}

            
having() public method

Sets the HAVING part of the query.

See also:

public $this having ( $condition, $params = [] )
$condition string|array|yii\db\ExpressionInterface

The conditions to be put after HAVING. Please refer to where() on how to specify this parameter.

$params array

The parameters (name => value) to be bound to the query.

return $this

The query object itself

                public function having($condition, $params = [])
{
    $this->having = $condition;
    $this->addParams($params);
    return $this;
}

            
indexBy() public method

Defined in: yii\db\QueryTrait::indexBy()

Sets the indexBy() property.

public $this indexBy ( $column )
$column string|callable

The name of the column by which the query results should be indexed by. This can also be a callable (e.g. anonymous function) that returns the index value based on the given row data. The signature of the callable should be:

function ($row)
{
    // return the index value corresponding to $row
}
return $this

The query object itself

                public function indexBy($column)
{
    $this->indexBy = $column;
    return $this;
}

            
init() public method

Defined in: yii\base\BaseObject::init()

Initializes the object.

This method is invoked at the end of the constructor after the object is initialized with the given configuration.

public void init ( )

                public function init()
{
}

            
innerJoin() public method

Appends an INNER JOIN part to the query.

public $this innerJoin ( $table, $on '', $params = [] )
$table string|array

The table or sub-query to be joined.

Use a string to represent the name of the table to be joined. The table name can contain a schema prefix (e.g. 'public.user') and/or table alias (e.g. 'user u'). The method will automatically quote the table name unless it contains some parenthesis (which means the table is given as a sub-query or DB expression).

You may also specify the table as an array with one element, using the array key as the table alias (e.g. ['u' => 'user']).

To join a sub-query, use an array with one element, with the value set to a yii\db\Query object representing the sub-query, and the corresponding key representing the alias.

$on string|array

The join condition that should appear in the ON part. Please refer to join() on how to specify this parameter.

$params array

The parameters (name => value) to be bound to the query.

return $this

The query object itself

                public function innerJoin($table, $on = '', $params = [])
{
    $this->join[] = ['INNER JOIN', $table, $on];
    return $this->addParams($params);
}

            
isEmpty() protected method

Defined in: yii\db\QueryTrait::isEmpty()

Returns a value indicating whether the give value is "empty".

The value is considered "empty", if one of the following conditions is satisfied:

  • it is null,
  • an empty string (''),
  • a string containing only whitespace characters,
  • or an empty array.
protected boolean isEmpty ( $value )
$value mixed
return boolean

If the value is empty

                protected function isEmpty($value)
{
    return $value === '' || $value === [] || $value === null || is_string($value) && trim($value) === '';
}

            
join() public method

Appends a JOIN part to the query.

The first parameter specifies what type of join it is.

public $this join ( $type, $table, $on '', $params = [] )
$type string

The type of join, such as INNER JOIN, LEFT JOIN.

$table string|array

The table or sub-query to be joined.

Use a string to represent the name of the table to be joined. The table name can contain a schema prefix (e.g. 'public.user') and/or table alias (e.g. 'user u'). The method will automatically quote the table name unless it contains some parenthesis (which means the table is given as a sub-query or DB expression).

You may also specify the table as an array with one element, using the array key as the table alias (e.g. ['u' => 'user']).

To join a sub-query, use an array with one element, with the value set to a yii\db\Query object representing the sub-query, and the corresponding key representing the alias.

$on string|array

The join condition that should appear in the ON part. Please refer to where() on how to specify this parameter.

Note that the array format of where() is designed to match columns to values instead of columns to columns, so the following would not work as expected: ['post.author_id' => 'user.id'], it would match the post.author_id column value against the string 'user.id'. It is recommended to use the string syntax here which is more suited for a join:

'post.author_id = user.id'
$params array

The parameters (name => value) to be bound to the query.

return $this

The query object itself

                public function join($type, $table, $on = '', $params = [])
{
    $this->join[] = [$type, $table, $on];
    return $this->addParams($params);
}

            
leftJoin() public method

Appends a LEFT OUTER JOIN part to the query.

public $this leftJoin ( $table, $on '', $params = [] )
$table string|array

The table or sub-query to be joined.

Use a string to represent the name of the table to be joined. The table name can contain a schema prefix (e.g. 'public.user') and/or table alias (e.g. 'user u'). The method will automatically quote the table name unless it contains some parenthesis (which means the table is given as a sub-query or DB expression).

You may also specify the table as an array with one element, using the array key as the table alias (e.g. ['u' => 'user']).

To join a sub-query, use an array with one element, with the value set to a yii\db\Query object representing the sub-query, and the corresponding key representing the alias.

$on string|array

The join condition that should appear in the ON part. Please refer to join() on how to specify this parameter.

$params array

The parameters (name => value) to be bound to the query

return $this

The query object itself

                public function leftJoin($table, $on = '', $params = [])
{
    $this->join[] = ['LEFT JOIN', $table, $on];
    return $this->addParams($params);
}

            
limit() public method

Defined in: yii\db\QueryTrait::limit()

Sets the LIMIT part of the query.

public $this limit ( $limit )
$limit integer|yii\db\ExpressionInterface|null

The limit. Use null or negative value to disable limit.

return $this

The query object itself

                public function limit($limit)
{
    $this->limit = $limit;
    return $this;
}

            
max() public method

Returns the maximum of the specified column values.

public mixed max ( $q, $db null )
$q string

The column name or expression. Make sure you properly quote column names in the expression.

$db yii\db\Connection|null

The database connection used to generate the SQL statement. If this parameter is not given, the db application component will be used.

return mixed

The maximum of the specified column values.

                public function max($q, $db = null)
{
    return $this->queryScalar("MAX($q)", $db);
}

            
min() public method

Returns the minimum of the specified column values.

public mixed min ( $q, $db null )
$q string

The column name or expression. Make sure you properly quote column names in the expression.

$db yii\db\Connection|null

The database connection used to generate the SQL statement. If this parameter is not given, the db application component will be used.

return mixed

The minimum of the specified column values.

                public function min($q, $db = null)
{
    return $this->queryScalar("MIN($q)", $db);
}

            
noCache() public method (available since version 2.0.14)

Disables query cache for this Query.

public $this noCache ( )
return $this

The Query object itself

                public function noCache()
{
    $this->queryCacheDuration = -1;
    return $this;
}

            
normalizeOrderBy() protected method

Defined in: yii\db\QueryTrait::normalizeOrderBy()

Normalizes format of ORDER BY data.

protected array normalizeOrderBy ( $columns )
$columns array|string|yii\db\ExpressionInterface

The columns value to normalize. See orderBy() and addOrderBy().

                protected function normalizeOrderBy($columns)
{
    if ($columns instanceof ExpressionInterface) {
        return [$columns];
    } elseif (is_array($columns)) {
        return $columns;
    }
    $columns = preg_split('/\s*,\s*/', trim($columns), -1, PREG_SPLIT_NO_EMPTY);
    $result = [];
    foreach ($columns as $column) {
        if (preg_match('/^(.*?)\s+(asc|desc)$/i', $column, $matches)) {
            $result[$matches[1]] = strcasecmp($matches[2], 'desc') ? SORT_ASC : SORT_DESC;
        } else {
            $result[$column] = SORT_ASC;
        }
    }
    return $result;
}

            
normalizeSelect() protected method (available since version 2.0.21)

Normalizes the SELECT columns passed to select() or addSelect().

protected array normalizeSelect ( $columns )
$columns string|array|yii\db\ExpressionInterface

                protected function normalizeSelect($columns)
{
    if ($columns instanceof ExpressionInterface) {
        $columns = [$columns];
    } elseif (!is_array($columns)) {
        $columns = preg_split('/\s*,\s*/', trim((string)$columns), -1, PREG_SPLIT_NO_EMPTY);
    }
    $select = [];
    foreach ($columns as $columnAlias => $columnDefinition) {
        if (is_string($columnAlias)) {
            // Already in the normalized format, good for them
            $select[$columnAlias] = $columnDefinition;
            continue;
        }
        if (is_string($columnDefinition)) {
            if (
                preg_match('/^(.*?)(?i:\s+as\s+|\s+)([\w\-_\.]+)$/', $columnDefinition, $matches) &&
                !preg_match('/^\d+$/', $matches[2]) &&
                strpos($matches[2], '.') === false
            ) {
                // Using "columnName as alias" or "columnName alias" syntax
                $select[$matches[2]] = $matches[1];
                continue;
            }
            if (strpos($columnDefinition, '(') === false) {
                // Normal column name, just alias it to itself to ensure it's not selected twice
                $select[$columnDefinition] = $columnDefinition;
                continue;
            }
        }
        // Either a string calling a function, DB expression, or sub-query
        $select[] = $columnDefinition;
    }
    return $select;
}

            
off() public method

Defined in: yii\base\Component::off()

Detaches an existing event handler from this component.

This method is the opposite of on().

Note: in case wildcard pattern is passed for event name, only the handlers registered with this wildcard will be removed, while handlers registered with plain names matching this wildcard will remain.

See also on().

public boolean off ( $name, $handler null )
$name string

Event name

$handler callable|null

The event handler to be removed. If it is null, all handlers attached to the named event will be removed.

return boolean

If a handler is found and detached

                public function off($name, $handler = null)
{
    $this->ensureBehaviors();
    if (empty($this->_events[$name]) && empty($this->_eventWildcards[$name])) {
        return false;
    }
    if ($handler === null) {
        unset($this->_events[$name], $this->_eventWildcards[$name]);
        return true;
    }
    $removed = false;
    // plain event names
    if (isset($this->_events[$name])) {
        foreach ($this->_events[$name] as $i => $event) {
            if ($event[0] === $handler) {
                unset($this->_events[$name][$i]);
                $removed = true;
            }
        }
        if ($removed) {
            $this->_events[$name] = array_values($this->_events[$name]);
            return true;
        }
    }
    // wildcard event names
    if (isset($this->_eventWildcards[$name])) {
        foreach ($this->_eventWildcards[$name] as $i => $event) {
            if ($event[0] === $handler) {
                unset($this->_eventWildcards[$name][$i]);
                $removed = true;
            }
        }
        if ($removed) {
            $this->_eventWildcards[$name] = array_values($this->_eventWildcards[$name]);
            // remove empty wildcards to save future redundant regex checks:
            if (empty($this->_eventWildcards[$name])) {
                unset($this->_eventWildcards[$name]);
            }
        }
    }
    return $removed;
}

            
offset() public method

Defined in: yii\db\QueryTrait::offset()

Sets the OFFSET part of the query.

public $this offset ( $offset )
$offset integer|yii\db\ExpressionInterface|null

The offset. Use null or negative value to disable offset.

return $this

The query object itself

                public function offset($offset)
{
    $this->offset = $offset;
    return $this;
}

            
on() public method

Defined in: yii\base\Component::on()

Attaches an event handler to an event.

The event handler must be a valid PHP callback. The following are some examples:

function ($event) { ... }         // anonymous function
[$object, 'handleClick']          // $object->handleClick()
['Page', 'handleClick']           // Page::handleClick()
'handleClick'                     // global function handleClick()

The event handler must be defined with the following signature,

function ($event)

where $event is an yii\base\Event object which includes parameters associated with the event.

Since 2.0.14 you can specify event name as a wildcard pattern:

$component->on('event.group.*', function ($event) {
    Yii::trace($event->name . ' is triggered.');
});

See also off().

public void on ( $name, $handler, $data null, $append true )
$name string

The event name

$handler callable

The event handler

$data mixed

The data to be passed to the event handler when the event is triggered. When the event handler is invoked, this data can be accessed via yii\base\Event::$data.

$append boolean

Whether to append new event handler to the end of the existing handler list. If false, the new handler will be inserted at the beginning of the existing handler list.

                public function on($name, $handler, $data = null, $append = true)
{
    $this->ensureBehaviors();
    if (strpos($name, '*') !== false) {
        if ($append || empty($this->_eventWildcards[$name])) {
            $this->_eventWildcards[$name][] = [$handler, $data];
        } else {
            array_unshift($this->_eventWildcards[$name], [$handler, $data]);
        }
        return;
    }
    if ($append || empty($this->_events[$name])) {
        $this->_events[$name][] = [$handler, $data];
    } else {
        array_unshift($this->_events[$name], [$handler, $data]);
    }
}

            
one() public method

Executes the query and returns a single row of result.

public array|boolean one ( $db null )
$db yii\db\Connection|null

The database connection used to generate the SQL statement. If this parameter is not given, the db application component will be used.

return array|boolean

The first row (in terms of an array) of the query result. False is returned if the query results in nothing.

                public function one($db = null)
{
    if ($this->emulateExecution) {
        return false;
    }
    return $this->createCommand($db)->queryOne();
}

            
orFilterHaving() public method (available since version 2.0.11)

Adds an additional HAVING condition to the existing one but ignores empty operands.

The new condition and the existing one will be joined using the OR operator.

This method is similar to orHaving(). The main difference is that this method will remove empty query operands. As a result, this method is best suited for building query conditions based on filter values entered by users.

See also:

public $this orFilterHaving ( array $condition )
$condition array

The new HAVING condition. Please refer to having() on how to specify this parameter.

return $this

The query object itself

                public function orFilterHaving(array $condition)
{
    $condition = $this->filterCondition($condition);
    if ($condition !== []) {
        $this->orHaving($condition);
    }
    return $this;
}

            
orFilterWhere() public method

Defined in: yii\db\QueryTrait::orFilterWhere()

Adds an additional WHERE condition to the existing one but ignores empty operands.

The new condition and the existing one will be joined using the 'OR' operator.

This method is similar to orWhere(). The main difference is that this method will remove empty query operands. As a result, this method is best suited for building query conditions based on filter values entered by users.

See also:

public $this orFilterWhere ( array $condition )
$condition array

The new WHERE condition. Please refer to where() on how to specify this parameter.

return $this

The query object itself

                public function orFilterWhere(array $condition)
{
    $condition = $this->filterCondition($condition);
    if ($condition !== []) {
        $this->orWhere($condition);
    }
    return $this;
}

            
orHaving() public method

Adds an additional HAVING condition to the existing one.

The new condition and the existing one will be joined using the OR operator.

See also:

public $this orHaving ( $condition, $params = [] )
$condition string|array|yii\db\ExpressionInterface

The new HAVING condition. Please refer to where() on how to specify this parameter.

$params array

The parameters (name => value) to be bound to the query.

return $this

The query object itself

                public function orHaving($condition, $params = [])
{
    if ($this->having === null) {
        $this->having = $condition;
    } else {
        $this->having = ['or', $this->having, $condition];
    }
    $this->addParams($params);
    return $this;
}

            
orWhere() public method

Adds an additional WHERE condition to the existing one.

The new condition and the existing one will be joined using the OR operator.

See also:

public $this orWhere ( $condition, $params = [] )
$condition string|array|yii\db\ExpressionInterface

The new WHERE condition. Please refer to where() on how to specify this parameter.

$params array

The parameters (name => value) to be bound to the query.

return $this

The query object itself

                public function orWhere($condition, $params = [])
{
    if ($this->where === null) {
        $this->where = $condition;
    } else {
        $this->where = ['or', $this->where, $condition];
    }
    $this->addParams($params);
    return $this;
}

            
orderBy() public method

Defined in: yii\db\QueryTrait::orderBy()

Sets the ORDER BY part of the query.

See also addOrderBy().

public $this orderBy ( $columns )
$columns string|array|yii\db\ExpressionInterface

The columns (and the directions) to be ordered by. Columns can be specified in either a string (e.g. "id ASC, name DESC") or an array (e.g. ['id' => SORT_ASC, 'name' => SORT_DESC]).

The method will automatically quote the column names unless a column contains some parenthesis (which means the column contains a DB expression).

Note that if your order-by is an expression containing commas, you should always use an array to represent the order-by information. Otherwise, the method will not be able to correctly determine the order-by columns.

Since version 2.0.7, an yii\db\ExpressionInterface object can be passed to specify the ORDER BY part explicitly in plain SQL.

return $this

The query object itself

                public function orderBy($columns)
{
    $this->orderBy = $this->normalizeOrderBy($columns);
    return $this;
}

            
params() public method

Sets the parameters to be bound to the query.

See also addParams().

public $this params ( $params )
$params array

List of query parameter values indexed by parameter placeholders. For example, [':name' => 'Dan', ':age' => 31].

return $this

The query object itself

                public function params($params)
{
    $this->params = $params;
    return $this;
}

            
populate() public method

Converts the raw query results into the format as specified by this query.

This method is internally used to convert the data fetched from database into the format as required by this query.

public array populate ( $rows )
$rows array

The raw query result from database

return array

The converted query result

                public function populate($rows)
{
    if ($this->indexBy === null) {
        return $rows;
    }
    $result = [];
    foreach ($rows as $row) {
        $result[ArrayHelper::getValue($row, $this->indexBy)] = $row;
    }
    return $result;
}

            
prepare() public method

Prepares for building SQL.

This method is called by yii\db\QueryBuilder when it starts to build SQL from a query object. You may override this method to do some final preparation work when converting a query into a SQL statement.

public $this prepare ( $builder )
$builder yii\db\QueryBuilder
return $this

A prepared query instance which will be used by yii\db\QueryBuilder to build the SQL

                public function prepare($builder)
{
    return $this;
}

            
queryScalar() protected method

Queries a scalar value by setting select() first.

Restores the value of select to make this query reusable.

protected boolean|string|null queryScalar ( $selectExpression, $db )
$selectExpression string|yii\db\ExpressionInterface
$db yii\db\Connection|null

The database connection used to execute the query.

throws Throwable

if can't create command

                protected function queryScalar($selectExpression, $db)
{
    if ($this->emulateExecution) {
        return null;
    }
    if (
        !$this->distinct
        && empty($this->groupBy)
        && empty($this->having)
        && empty($this->union)
    ) {
        $select = $this->select;
        $order = $this->orderBy;
        $limit = $this->limit;
        $offset = $this->offset;
        $this->select = [$selectExpression];
        $this->orderBy = null;
        $this->limit = null;
        $this->offset = null;
        $e = null;
        try {
            $command = $this->createCommand($db);
        } catch (\Exception $e) {
            // throw it later (for PHP < 7.0)
        } catch (\Throwable $e) {
            // throw it later
        }
        $this->select = $select;
        $this->orderBy = $order;
        $this->limit = $limit;
        $this->offset = $offset;
        if ($e !== null) {
            throw $e;
        }
        return $command->queryScalar();
    }
    $command = (new self())
        ->select([$selectExpression])
        ->from(['c' => $this])
        ->createCommand($db);
    $this->setCommandCache($command);
    return $command->queryScalar();
}

            
rightJoin() public method

Appends a RIGHT OUTER JOIN part to the query.

public $this rightJoin ( $table, $on '', $params = [] )
$table string|array

The table or sub-query to be joined.

Use a string to represent the name of the table to be joined. The table name can contain a schema prefix (e.g. 'public.user') and/or table alias (e.g. 'user u'). The method will automatically quote the table name unless it contains some parenthesis (which means the table is given as a sub-query or DB expression).

You may also specify the table as an array with one element, using the array key as the table alias (e.g. ['u' => 'user']).

To join a sub-query, use an array with one element, with the value set to a yii\db\Query object representing the sub-query, and the corresponding key representing the alias.

$on string|array

The join condition that should appear in the ON part. Please refer to join() on how to specify this parameter.

$params array

The parameters (name => value) to be bound to the query

return $this

The query object itself

                public function rightJoin($table, $on = '', $params = [])
{
    $this->join[] = ['RIGHT JOIN', $table, $on];
    return $this->addParams($params);
}

            
scalar() public method

Returns the query result as a scalar value.

The value returned will be the first column in the first row of the query results.

public string|integer|null|false scalar ( $db null )
$db yii\db\Connection|null

The database connection used to generate the SQL statement. If this parameter is not given, the db application component will be used.

return string|integer|null|false

The value of the first column in the first row of the query result. False is returned if the query result is empty.

                public function scalar($db = null)
{
    if ($this->emulateExecution) {
        return null;
    }
    return $this->createCommand($db)->queryScalar();
}

            
select() public method

Sets the SELECT part of the query.

public $this select ( $columns, $option null )
$columns string|array|yii\db\ExpressionInterface

The columns to be selected. Columns can be specified in either a string (e.g. "id, name") or an array (e.g. ['id', 'name']). Columns can be prefixed with table names (e.g. "user.id") and/or contain column aliases (e.g. "user.id AS user_id"). The method will automatically quote the column names unless a column contains some parenthesis (which means the column contains a DB expression). A DB expression may also be passed in form of an yii\db\ExpressionInterface object.

Note that if you are selecting an expression like CONCAT(first_name, ' ', last_name), you should use an array to specify the columns. Otherwise, the expression may be incorrectly split into several parts.

When the columns are specified as an array, you may also use array keys as the column aliases (if a column does not need alias, do not use a string key).

Starting from version 2.0.1, you may also select sub-queries as columns by specifying each such column as a Query instance representing the sub-query.

$option string|null

Additional option that should be appended to the 'SELECT' keyword. For example, in MySQL, the option 'SQL_CALC_FOUND_ROWS' can be used.

return $this

The query object itself

                public function select($columns, $option = null)
{
    $this->select = $this->normalizeSelect($columns);
    $this->selectOption = $option;
    return $this;
}

            
setCommandCache() protected method (available since version 2.0.14)

Sets $command cache, if this query has enabled caching.

protected yii\db\Command setCommandCache ( $command )
$command yii\db\Command

                protected function setCommandCache($command)
{
    if ($this->queryCacheDuration !== null || $this->queryCacheDependency !== null) {
        $duration = $this->queryCacheDuration === true ? null : $this->queryCacheDuration;
        $command->cache($duration, $this->queryCacheDependency);
    }
    return $command;
}

            
sum() public method

Returns the sum of the specified column values.

public mixed sum ( $q, $db null )
$q string

The column name or expression. Make sure you properly quote column names in the expression.

$db yii\db\Connection|null

The database connection used to generate the SQL statement. If this parameter is not given, the db application component will be used.

return mixed

The sum of the specified column values.

                public function sum($q, $db = null)
{
    if ($this->emulateExecution) {
        return 0;
    }
    return $this->queryScalar("SUM($q)", $db);
}

            
trigger() public method

Defined in: yii\base\Component::trigger()

Triggers an event.

This method represents the happening of an event. It invokes all attached handlers for the event including class-level handlers.

public void trigger ( $name, yii\base\Event $event null )
$name string

The event name

$event yii\base\Event|null

The event instance. If not set, a default yii\base\Event object will be created.

                public function trigger($name, Event $event = null)
{
    $this->ensureBehaviors();
    $eventHandlers = [];
    foreach ($this->_eventWildcards as $wildcard => $handlers) {
        if (StringHelper::matchWildcard($wildcard, $name)) {
            $eventHandlers[] = $handlers;
        }
    }
    if (!empty($this->_events[$name])) {
        $eventHandlers[] = $this->_events[$name];
    }
    if (!empty($eventHandlers)) {
        $eventHandlers = call_user_func_array('array_merge', $eventHandlers);
        if ($event === null) {
            $event = new Event();
        }
        if ($event->sender === null) {
            $event->sender = $this;
        }
        $event->handled = false;
        $event->name = $name;
        foreach ($eventHandlers as $handler) {
            $event->data = $handler[1];
            call_user_func($handler[0], $event);
            // stop further handling if the event is handled
            if ($event->handled) {
                return;
            }
        }
    }
    // invoke class-level attached handlers
    Event::trigger($this, $name, $event);
}

            
union() public method

Appends a SQL statement using UNION operator.

public $this union ( $sql, $all false )
$sql string|yii\db\Query

The SQL statement to be appended using UNION

$all boolean

TRUE if using UNION ALL and FALSE if using UNION

return $this

The query object itself

                public function union($sql, $all = false)
{
    $this->union[] = ['query' => $sql, 'all' => $all];
    return $this;
}

            
where() public method

Sets the WHERE part of the query.

The method requires a $condition parameter, and optionally a $params parameter specifying the values to be bound to the query.

The $condition parameter should be either a string (e.g. 'id=1') or an array.

{@inheritdoc}

See also:

public $this where ( $condition, $params = [] )
$condition string|array|yii\db\ExpressionInterface

The conditions that should be put in the WHERE part.

$params array

The parameters (name => value) to be bound to the query.

return $this

The query object itself

                public function where($condition, $params = [])
{
    $this->where = $condition;
    $this->addParams($params);
    return $this;
}

            
withQuery() public method (available since version 2.0.35)

Prepends a SQL statement using WITH syntax.

public $this withQuery ( $query, $alias, $recursive false )
$query string|yii\db\Query

The SQL statement to be prepended using WITH

$alias string

Query alias in WITH construction

$recursive boolean

TRUE if using WITH RECURSIVE and FALSE if using WITH

return $this

The query object itself

                public function withQuery($query, $alias, $recursive = false)
{
    $this->withQueries[] = ['query' => $query, 'alias' => $alias, 'recursive' => $recursive];
    return $this;
}