Doctrine 中的简单 IF 测试语句

Simple IF test statement in Doctrine(Doctrine 中的简单 IF 测试语句)

问题描述

Doctrine 是否支持 IF 语句?我收到以下错误:

Does Doctrine support IF statements? I get the following error:

Expected known function, got 'IF'

使用 IF 执行此查询时:

while executing this query with IF:

$qb->select("c.id, IF(c.type_id LIKE 9, c.name, c.lastname) as name")

用纯 SQL 重写时它工作正常.有什么解决方法吗?

It works fine while re-written in pure SQL. Any workarounds?

推荐答案

是的 if 中的语句不支持你可以将它转换为 case when

Yes if statements in doctrine is not supported you may convert it to case when

IF(c.type_id LIKE 9, c.name, c.lastname) as name

到

case when c.type_id = 9 then c.name else c.lastname end as name

更新:从评论中，concat 函数在 case-when

答案是肯定的，非常允许.这是一个例子

The answer is yes very much allowed. Here is an example

mysql> select * from timesheets ;
+-----------+-------+----------+
| client_id | hours | category |
+-----------+-------+----------+
|         1 |  1.50 | onsite   |
|         1 |  1.50 | onsite   |
|         1 |  1.00 | remote   |
|         2 |  1.50 | remote   |
+-----------+-------+----------+
4 rows in set (0.00 sec)

mysql> select 
case when category = 'onsite' then concat('ON',' ',hours) else hours
end as dd from timesheets ;
+---------+
| dd      |
+---------+
| ON 1.50 |
| ON 1.50 |
| 1.00    |
| 1.50    |
+---------+
4 rows in set (0.00 sec)

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