如何使用学说2中的mysql的LEFT函数?查询应该类似于
SELECT LEFT(myfield, N) FROM mytable
最佳答案
<?php
use Doctrine\ORM\Query\AST\Functions\FunctionNode;
use Doctrine\ORM\Query\Lexer;
/**
* JsonbExistence ::= "LEFT('a', 'b')"
*
* This will be converted to: "LEFT('a', 'b')"
*
*/
class LeftFunction extends FunctionNode
{
public $column = null;
public $regexp = null;
public function parse(\Doctrine\ORM\Query\Parser $parser)
{
$parser->match(Lexer::T_IDENTIFIER);
$parser->match(Lexer::T_OPEN_PARENTHESIS);
$this->column = $parser->ArithmeticPrimary();
$parser->match(Lexer::T_COMMA);
$this->regexp = $parser->ArithmeticPrimary();
$parser->match(Lexer::T_CLOSE_PARENTHESIS);
}
public function getSql(\Doctrine\ORM\Query\SqlWalker $sqlWalker)
{
return sprintf('LEFT(%s, %s)', $this->column->dispatch($sqlWalker), $this->regexp->dispatch($sqlWalker));
}
}
关于php - LEFT 主义 mysql 函数,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/9761748/