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Final Class Yiisoft\Db\Mssql\Builder\LongestBuilder

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InheritanceYiisoft\Db\Mssql\Builder\LongestBuilder » Yiisoft\Db\Expression\Function\Builder\MultiOperandFunctionBuilder

Builds SQL representation of function expressions which returns the longest string from a set of operands.

(SELECT TOP 1 value FROM (
    SELECT operand1 AS value
    UNION
    SELECT operand2 AS value
) AS t ORDER BY LEN(value) DESC)

Protected Methods

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Method Description Defined By
buildFromExpression() Builds a SQL expression to represent the function which returns the longest string. Yiisoft\Db\Mssql\Builder\LongestBuilder

Method Details

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buildFromExpression() protected method

Builds a SQL expression to represent the function which returns the longest string.

protected string buildFromExpression ( \Yiisoft\Db\Expression\Function\Greatest $expression, array &$params )
$expression \Yiisoft\Db\Expression\Function\Greatest

The expression to build.
$params array

The parameters to bind.
return string

The SQL expression.

 

                protected function buildFromExpression(MultiOperandFunction $expression, array &$params): string
{
    $selects = [];
    foreach ($expression->getOperands() as $operand) {
        $selects[] = 'SELECT ' . $this->buildOperand($operand, $params) . ' AS value';
    }
    $unions = implode(' UNION ', $selects);
    return "(SELECT TOP 1 value FROM ($unions) AS t ORDER BY LEN(value) DESC)";
}