Final Class Yiisoft\Db\Mysql\Connection

                public function close(): void
{
    if ($this->pdo !== null) {
        $this->logger?->log(
            LogLevel::DEBUG,
            'Closing DB connection: ' . $this->driver->getDsn() . ' ' . __METHOD__,
        );
        // Solution for close connections {@link https://stackoverflow.com/questions/18277233/pdo-closing-connection}
        try {
            $this->pdo->exec('KILL CONNECTION_ID()');
        } catch (Throwable) {
        }
        $this->pdo = null;
        $this->transaction = null;
    }
}

            

                public function createCommand(?string $sql = null, array $params = []): PdoCommandInterface
{
    $command = new Command($this);
    if ($sql !== null) {
        $command->setSql($sql);
    }
    if ($this->logger !== null) {
        $command->setLogger($this->logger);
    }
    if ($this->profiler !== null) {
        $command->setProfiler($this->profiler);
    }
    return $command->bindValues($params);
}

            

                public function createTransaction(): TransactionInterface
{
    return new Transaction($this);
}

            

                public function getColumnBuilderClass(): string
{
    return ColumnBuilder::class;
}

            

                public function getColumnFactory(): ColumnFactoryInterface
{
    return $this->columnFactory ??= new ColumnFactory();
}

            

                public function getQueryBuilder(): QueryBuilderInterface
{
    return $this->queryBuilder ??= new QueryBuilder($this);
}

            

                public function getQuoter(): QuoterInterface
{
    return $this->quoter ??= new Quoter('`', '`', $this->getTablePrefix());
}

            

                public function getSchema(): SchemaInterface
{
    return $this->schema ??= new Schema($this, $this->schemaCache);
}

            

                public function getServerInfo(): ServerInfoInterface
{
    return $this->serverInfo ??= new ServerInfo($this);
}