MySQL的 - 更新/外壳

Question

我有一个表测试

TestNumber (int primary key) 
InactiveBitwise (int) 

我让下面的命令：

UPDATE tests SET CASE 
     WHEN TestNumber = 2 THEN InactiveBitwise = (InactiveBitwise | 4) 
     WHEN TestNumber = 3 THEN InactiveBitwise = (InactiveBitwise | 8) 
END WHERE TestNumber IN (2, 3) 

但它给错

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'CASE WHEN TestNumber = 2 THEN InactiveBitwise = (InactiveBitwise |' 

两个TestNumber = 2， 3存在，因为我之前从调用数据库中获得它们。

有谁知道它不喜欢什么？

Answer 1

你需要指定你想改变列的值，案件将只确定返回值：

UPDATE tests SET InactiveBitwise = CASE 
     WHEN TestNumber = 2 THEN (InactiveBitwise | 4) 
     WHEN TestNumber = 3 THEN (InactiveBitwise | 8) 
    END 
WHERE TestNumber IN (2, 3)