本文介绍了Doctrine 中的简单 IF 测试语句的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
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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