CASTING属性用于在Doctrine2 DQL查询中排序

问题描述

我试图获取 Doctrine2实体，按照其ID排序，显然它是一个字符串，即使它只包含数字。
所以我想做的是这样的：

  SELECT entity1，cast（entity1.id AS integer ）as orderId 
 FROM Namespace\Bla\MyEntity 
 ORDER BY orderId 
  

有没有办法在 Doctrine2 中执行这样的操作？
或者，如果我不能更改id的类型（由于客户的要求当然），那么获得我的结果的最佳做法是什么？

$ b $注意

：我不是在询问SQL代码，我要求一个Doctrine2解决方案，最好在DQL

解决方案

您应该能够以实现此功能。

类看起来像这样：

 命名空间MyProject\Query; 
 
使用Doctrine\ORM\Query\AST\Functions\FunctionNode; 
 use Doctrine\ORM\Query\Lexer; 
 use Doctrine\ORM\Query\Parser; 
 use Doctrine\ORM\Query\SqlWalker; 
 
 class CastAsInteger extends FunctionNode 
 {
 public $ stringPrimary; 
 
 public function getSql（SqlWalker $ sqlWalker）
 {
 return'CAST（'。$ this-> stringPrimary-> dispatch（$ sqlWalker）。'AS integer） '; 
} 
 
 public function parse（Parser $ parser）
 {
 $ parser-> match（Lexer :: T_IDENTIFIER）; 
 $ parser-> match（Lexer :: T_OPEN_PARENTHESIS）; 
 
 $ this-> stringPrimary = $ parser-> StringPrimary（）; 
 
 $ parser-> match（Lexer :: T_CLOSE_PARENTHESIS）; 
} 
} 
  

您需要注册您的功能： p>

  $ config = $ em-> getConfiguration（）; 
 $ config-> addCustomNumericFunction（'INT'，'MyProject\Query\CastAsInteger'）; 
  

然后您可以使用它：

  SELECT e，INT（e.id）AS HIDDEN orderId FROM Namespace\Bla\ MyEntity e ORDER BY orderId 
  

PS：通过添加 HIDDEN 关键字，别名 orderId 不在结果中（仅用于排序）。

I am trying to get Doctrine2 Entities, ordered by their ID which apparently is a String even though it contains only Numbers.So what I would like to do is something like this:

SELECT entity1, cast (entity1.id AS integer) AS orderId
FROM Namespace\Bla\MyEntity
ORDER BY orderId

Is there a way to do something like this in Doctrine2?Or, what would be the best practise to get my Result if i can't change the type of the id (due to customer requirements of course)?

---

Attention: I am not asking SQL Code, i am asking for a Doctrine2 Solution, preferably in DQL

解决方案

You should be able to add your own function to implement this feature.

The class would look something like this:

namespace MyProject\Query;

use Doctrine\ORM\Query\AST\Functions\FunctionNode;
use Doctrine\ORM\Query\Lexer;
use Doctrine\ORM\Query\Parser;
use Doctrine\ORM\Query\SqlWalker;

class CastAsInteger extends FunctionNode
{
    public $stringPrimary;

    public function getSql(SqlWalker $sqlWalker)
    {
        return 'CAST(' . $this->stringPrimary->dispatch($sqlWalker) . ' AS integer)';
    }

    public function parse(Parser $parser)
    {
        $parser->match(Lexer::T_IDENTIFIER);
        $parser->match(Lexer::T_OPEN_PARENTHESIS);

        $this->stringPrimary = $parser->StringPrimary();

        $parser->match(Lexer::T_CLOSE_PARENTHESIS);
    }
}

You'll need to register your function:

$config = $em->getConfiguration();
$config->addCustomNumericFunction('INT', 'MyProject\Query\CastAsInteger');

Then you can use it:

SELECT e, INT(e.id) AS HIDDEN orderId FROM Namespace\Bla\MyEntity e ORDER BY orderId

PS: By adding the HIDDEN keyword, the alias orderId won't be in the results (and is only used for ordering).

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