php - 如何在 Doctrine 中使用mysql变量

Question

https://stackoverflow.com/a/12772507/1507546

我想通过 Doctrine 执行此查询，但收到以下错误

[Doctrine\DBAL\Driver\PDOException] SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near '@counter := 0' at line 1

这是我的代码

$sql = <<<S
    SET @counter = 0; 
    Select sub.orderid,sub.value,(@counter := @counter +1) as counter
    FROM
    (
        select orderid, 
          round(sum(unitprice * quantity),2) as value
        from order_details
        group by orderid
    ) sub
    order by 2 desc
    limit 10
S;

stmt = $this->_em->getConnection()->prepare($sql);

$stmt->execute();

return $stmt->fetchAll(AbstractQuery::HYDRATE_ARRAY);

Answer 1

大多数 sql API 不允许在没有额外配置的情况下使用多个语句。您需要将它们作为单独的语句传递:

$this->_em->getConnection()->exec("SET @counter = 0"); // May need tweaking, I'm not familiar with Doctrine
$sql = <<<S
    Select sub.orderid,sub.value,(@counter := @counter +1) as counter
    FROM
    (
        select orderid, 
          round(sum(unitprice * quantity),2) as value
        from order_details
        group by orderid
    ) sub
    order by 2 desc
    limit 10
S;

stmt = $this->_em->getConnection()->prepare($sql);