錯誤：預計文字，得到'CASE'

Question

我有以下查詢，我需要修改與symfony2一起使用。

SELECT someColumn, COUNT(*) AS n, 
SUM(IF(STATUS = 20,1,0)) AS sent 
FROM someTable 
WHERE ID = :id; 

我做了什麼至今：

$query = ("SELECT myEntity.someField AS someColumn, 
      SUM(CASE WHEN myEntity.status = '20' then 1 ELSE 0 END) as sent 
      FROM AppRoot\MyBundle\Entity\MyEntity myEntity 
      WHERE myEntity.id = :id 
      "); 

，但我得到了可怕的錯誤：

Error: Expected Literal, got 'CASE' 

Answer 1

假設你從EntityRepository調用它，你可以實例\主義\ ORM \ QueryBuilder像這樣：

$em = $this->_em->createQueryBuilder(); 

接下來，您可以使用構建查詢：

$qb->select(array(
    'myEntity.someField as someColumn', 
    'count(myEntity) as n', 
    'SUM(CASE WHEN myEntity.status = :status then 1 ELSE 0 END) as sent', 
    ... // add all the columns you need 
)) 
    ->from('AppRoot\MyBundle\Entity\MyEntity','MyEntity') 
    ->where($qb->expr()->eq('myEntity.id', ':id')) 
    ->setParameters(array(
     'status'=>'20', 
     'id' => $theEntityId 
)); 

最後，你可以檢索你的結果是這樣的：

$qb->getQuery()->getResult(); 

，或者如果你喜歡一個普通的舊式陣列：

$qb->getQuery()->getArrayResult(); 

這應該工作，你可以檢查生成的查詢：

$qb->getQuery()->getDQL(); // get the Doctrine Query Language query 
$qb->getQuery()->getSQL(); // get the SQL generated query