Question

我在使用zend框架mysql groupby查询时遇到了麻烦。我想要实现的是这个查询

SELECT * FROM `price_list` AS `pl` 
GROUP BY 
CASE WHEN `pl`.`sub_folder` IS NULL THEN 
`pl`.`id` 
ELSE 
`pl`.`sub_folder` 
END 
ORDER BY `pl`.`date_added` DESC

以下是我用zend方式尝试的内容

$sql = $this->select()->setIntegrityCheck(false);       
$sql->from(array('pl'=>$this->_name), array(''))
    ->columns($cols)
    ->group("case when pl.sub_folder is null then pl.id else pl.sub_folder end");

但在情况条件下输出此sql字符串的引号错误：

SELECT * FROM `price_list_pdf` AS `pl` 
GROUP BY `CASE WHEN pl`.`sub_folder is null then 
pl`.`id 
ELSE
pl`.`sub_folder 
end` 
ORDER BY `pl`.`date_added` DESC

如何清除字符串中的`？还是有更好的方法吗？请帮忙..

Answer 1

对于未转义的查询，请使用Expressions之类的

$sql = $this->select()->setIntegrityCheck(false);       
$sql->from(array('pl'=>$this->_name), array(''))
        ->columns($cols)
        ->group(new Zend_Db_Expr("case when pl.sub_folder is null then pl.id else pl.sub_folder end"));

Zend Framework逐个案例

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