8.3.4 - mysql 枚举,

Posted 2020-10-27 如果迎着风就飞，俯瞰这世界有多美

枚举类型与集合类型

字段的值只能在给定范围中选择，如单选框，多选框

enum 单选 只能在给定的范围内选一个值，如性别 sex 男male/女female

set 多选 在给定的范围内可以选择一个或一个以上的值（爱好1,爱好2,爱好3...）

create table consumer(
 id int,
 name char(16), 
 sex enum(‘male‘,‘female‘),
 level enum (‘vip1‘,‘vip2‘,‘vip3‘),
 hobbies set(‘play‘,‘music‘,‘run‘)
);

insert into consumer values
(1,‘cmz‘,‘male‘,‘vip1‘,‘music,run‘);

# 因为不在选择范围内会报错
insert into consumer values
(2,‘cmz‘,‘xxx‘,‘vip1‘,‘music,run‘); 

# 操作过程
mysql> create table consumer(
    ->  id int,
    ->  name char(16), 
    ->  sex enum(‘male‘,‘female‘),
    ->  level enum (‘vip1‘,‘vip2‘,‘vip3‘),
    ->  hobbies set(‘play‘,‘music‘,‘run‘)
    -> );
Query OK, 0 rows affected (0.03 sec)

mysql> insert into consumer values
    -> (1,‘cmz‘,‘male‘,‘vip1‘,‘music,run‘);
Query OK, 1 row affected (0.04 sec)
mysql> select * from consumer;
+------+------+------+-------+-----------+
| id   | name | sex  | level | hobbies   |
+------+------+------+-------+-----------+
|    1 | cmz  | male | vip1  | music,run |
+------+------+------+-------+-----------+
1 row in set (0.00 sec)

mysql> insert into consumer values
    -> (1,‘cmz‘,‘xxx‘,‘vip1‘,‘music,run‘);
ERROR 1265 (01000): Data truncated for column ‘sex‘ at row 1