定义的变量不适用于 yii 中的 createCommand答案

【问题标题】：defined variable doesnt work with createCommand in yii定义的变量不适用于 yii 中的 createCommand
【发布时间】：2015-06-02 10:25:47
【问题描述】：

我使用 createCommand 并在下面的查询中运行此命令，但我的项目中出现错误

$all_project_tasks = Yii::app()->db->createCommand("
            set @prevOrder=0;
            set @mm=0;
            set@dt=0;
            select * from project_task_user_id ptui right join
            (select id,`desc`,due_time,list_id,if(@prevOrder=`order`,
            @dt,@dt:=@dt+due_time) this_finish_due,if(@prevOrder=`order`,
            @mm,if(@prevOrder=0,@mm,@mm:=@dt-due_time)) prev_due,@prevOrder:=`order` as `order` 
            from (select id,`desc`,due_time,`order`,list_id from project_task a 
            where a.list_id in (select id from project_list where project_id=1 ) 
            and (a.due_time is not null) order by a.order asc,a.due_time desc ) as b) l
            ON ptui.project_task = l.id where ptui.member_id =7 ")
    ->queryAll();

得到这个错误

SQLSTATE[HY000]：一般错误。执行的 SQL 语句是

为什么会出现这个错误？我哪里错了？ creatCommand 不支持 sql 中的 @variable ？

【问题讨论】：

标签： php mysql sql yii

【解决方案1】：

Yii 的 createCommand 是基于 PDO 的，所以不支持多查询执行。

$all_project_tasks = Yii::app()->db->createCommand("set @prevOrder=0")->execute();
       $all_project_tasks = Yii::app()->db->createCommand("set @mm=0")->execute();
       $all_project_tasks = Yii::app()->db->createCommand("set @dt=0")->execute();
       $all_project_tasks = Yii::app()->db->createCommand('select * from project_task_user_id ptui right join (select id,`desc`,due_time,list_id,if(@prevOrder=`order`,@dt,@dt:=@dt+due_time) this_finish_due,if(@prevOrder=`order`,@mm,if(@prevOrder=0,@mm,@mm:=@dt-due_time)) prev_due,@prevOrder:=`order` as `order`
                                            from (select id,`desc`,due_time,`order`,list_id from project_task a where a.list_id in (select id from project_list where project_id=1 )and (a.due_time is not null) order by a.order asc,a.due_time desc ) as b) l
                                                ON ptui.project_task = l.id where ptui.member_id =7')->queryAll();

我认为这一定可以正常工作。

【讨论】：