我必须SUBSTRING_INDEX
在symfony 2的ORM中使用函数。我该怎么做?现在在查询中使用它给了我未定义的函数错误:
[Syntax Error] line 0, col 299: Error: Expected known function, got 'SUBSTRING_INDEX'
我使用此函数从中获取第一个数字,例如:
11.48.205.1
我该如何解决?
这是代表SUBSTRING_INDEX函数的类(不要忘记更新名称空间)。
<?php
namespace Sad\Functions;
use Doctrine\ORM\Query\AST\Functions\FunctionNode;
use Doctrine\ORM\Query\Lexer;
use Doctrine\ORM\Query\SqlWalker;
use Doctrine\ORM\Query\Parser;
/**
* "SUBSTRING_INDEX" "(" ArithmeticPrimary "," ArithmeticPrimary "," ArithmeticPrimary ")"
*
* @author Andrey Stepanov <[email protected]>
*/
class SubstringIndexFunction extends FunctionNode
{
public $str = null;
public $delim = null;
public $count = null;
/**
* @override
*/
public function getSql(SqlWalker $sqlWalker)
{
return 'SUBSTRING_INDEX(' .
$this->str->dispatch($sqlWalker) . ', ' .
$this->delim->dispatch($sqlWalker) . ', ' .
$this->count->dispatch($sqlWalker) .
')';
}
/**
* @override
*/
public function parse(Parser $parser)
{
$parser->match(Lexer::T_IDENTIFIER);
$parser->match(Lexer::T_OPEN_PARENTHESIS);
$this->str = $parser->ArithmeticPrimary();
$parser->match(Lexer::T_COMMA);
$this->delim = $parser->ArithmeticPrimary();
$parser->match(Lexer::T_COMMA);
$this->count = $parser->ArithmeticPrimary();
$parser->match(Lexer::T_CLOSE_PARENTHESIS);
}
}
您需要先注册它,然后再创建实体管理器:
$config->addCustomStringFunction('SUBSTRING_INDEX', 'Sad\Functions\SubstringIndexFunction');
/* ... */
$entityManager = EntityManager::create($conn, $config);
完成后,您将获得以下结果:
echo $entityManager->createQuery("SELECT p FROM \Sad\Schema\AbstractPageAny as p WHERE SUBSTRING_INDEX(p.name,'a',1) = 'P'")->getSQL();
// Output: SELECT p0_.id AS id_0, p0_.name AS name_1, p0_.type AS type_2 FROM page p0_ WHERE (SUBSTRING_INDEX(p0_.name, 'a', 1) = 'P')
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