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为MySQL中的枚举值设置自定义消息

2024-05-02 20:55:04 470

使用ifelse设置枚举的自定义消息。让我们首先创建一个表-

mysql> create table DemoTable1992
(
   ClientId int NOT NULL AUTO_INCREMENT PRIMARY KEY,
   ClientName varchar(20),
   isActive ENUM('Y','N')
);

使用插入命令在表中插入一些记录-

mysql> insert into DemoTable1992(ClientName,isActive) values('Chris','N');
mysql> insert into DemoTable1992(ClientName,isActive) values('Bob','N');
mysql> insert into DemoTable1992(ClientName,isActive) values('David','Y');
mysql> insert into DemoTable1992(ClientName,isActive) values('Carol','N');

使用select语句显示表中的所有记录-

mysql> select * from DemoTable1992;

这将产生以下输出-

+----------+------------+----------+
| ClientId | ClientName | isActive |
+----------+------------+----------+
|        1 | Chris      | N        |
|        2 | Bob        | N        |
|        3 | David      | Y        |
|        4 | Carol      | N        |
+----------+------------+----------+
4 rows in set (0.00 sec)

这是使用if设置自定义消息的查询

mysql> select ClientName,if(isActive='Y','Active Member','Not Active Member') as Result from DemoTable1992;

这将产生以下输出-

+------------+-------------------+
| ClientName | Result            |
+------------+-------------------+
| Chris      | Not Active Member |
| Bob        | Not Active Member |
| David      | Active Member     |
| Carol      | Not Active Member |
+------------+-------------------+
4 rows in set (0.00 sec)

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为MySQL中的枚举值设置自定义消息

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