解决了繁琐的配置，让 mybatis 优雅的使用枚举属性！
修改表结构
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ALTER TABLE `tb_user` ADD COLUMN `sex` INT ( 1 ) NULL DEFAULT 1 COMMENT '1-男，2-女' AFTER `deleted`;
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定义枚举
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public enum SexEnum implements IEnum<Integer> {
MAN(1, "男"), WOMAN(2, "女");
private int value;
private String desc;
SexEnum(int value, String desc) {
this.value = value;
this.desc = desc;
}
@Override
public Integer getValue() {
return this.value;
}
@Override
public String toString() {
return this.desc;
}
}
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配置
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# 枚举包扫描
mybatis-plus.type-enums-package=cn.com.javakf.enums
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修改实体
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private SexEnum sex; // 性别，枚举类型
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测试
插入
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@Test
public void testInsert() {
User user = new User();
user.setUserName("diaochan");
user.setPassword("123456");
user.setAge(20);
user.setName("貂蝉");
user.setMail("diaochan@163.com");
user.setVersion(1);
user.setSex(SexEnum.WOMAN); // 使用的是枚举
// 调用AR的insert方法进行插入数据
boolean insert = user.insert();
System.out.println("result => " + insert);
}
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SQL
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[main] [cn.com.javakf.mapper.UserMapper.insert]-[DEBUG] ==> Preparing: INSERT INTO tb_user ( user_name, password, name, age, email, version, sex ) VALUES ( ?, ?, ?, ?, ?, ?, ? )
[main] [cn.com.javakf.mapper.UserMapper.insert]-[DEBUG] ==> Parameters: diaochan(String), 123456(String), 貂蝉(String), 20(Integer), diaochan@163.com(String), 1(Integer), 2(Integer)
[main] [cn.com.javakf.mapper.UserMapper.insert]-[DEBUG] <== Updates: 1
Time：43 ms - ID：cn.com.javakf.mapper.UserMapper.insert
Execute SQL：
INSERT
INTO
tb_user
( user_name, password, name, age, email, version, sex )
VALUES
( 'diaochan', '123456', '貂蝉', 20, 'diaochan@163.com', 1, 2 )
[main] [org.mybatis.spring.SqlSessionUtils]-[DEBUG] Closing non transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@44550792]
result => true
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查询
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@Test
public void testSelectById() {
User user = new User();
user.setId(11L);
User user1 = user.selectById();
System.out.println(user1);
}
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SQL
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[main] [cn.com.javakf.mapper.UserMapper.selectById]-[DEBUG] ==> Preparing: SELECT id,user_name,name,age,email AS mail,version,deleted,sex FROM tb_user WHERE id=? AND deleted=0
[main] [cn.com.javakf.mapper.UserMapper.selectById]-[DEBUG] ==> Parameters: 12(Long)
[main] [cn.com.javakf.mapper.UserMapper.selectById]-[DEBUG] <== Total: 1
[main] [org.mybatis.spring.SqlSessionUtils]-[DEBUG] Closing non transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@474c9131]
User(id=12, userName=diaochan, password=null, name=貂蝉, age=20, mail=diaochan@163.com, address=null, version=1, deleted=0, sex=女)
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从测试可以看出，可以很方便的使用枚举了。
条件查询
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@Test
public void testSelectBySex() {
User user = new User();
QueryWrapper<User> wrapper = new QueryWrapper<>();
wrapper.eq("sex", SexEnum.WOMAN); // 查询性别为女的数据
List<User> users = user.selectList(wrapper);
for (User user1 : users) {
System.out.println(user1);
}
}
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SQL
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[main] [cn.com.javakf.mapper.UserMapper.selectList]-[DEBUG] ==> Preparing: SELECT id,user_name,name,age,email AS mail,version,deleted,sex FROM tb_user WHERE deleted=0 AND sex = ?
[main] [cn.com.javakf.mapper.UserMapper.selectList]-[DEBUG] ==> Parameters: 2(Integer)
[main] [cn.com.javakf.mapper.UserMapper.selectList]-[DEBUG] <== Total: 1
Time：15 ms - ID：cn.com.javakf.mapper.UserMapper.selectList
Execute SQL：
SELECT
id,
user_name,
name,
age,
email AS mail,
version,
deleted,
sex
FROM
tb_user
WHERE
deleted=0
AND sex = 2
[main] [org.mybatis.spring.SqlSessionUtils]-[DEBUG] Closing non transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@3a3b10f4]
User(id=12, userName=diaochan, password=null, name=貂蝉, age=20, mail=diaochan@163.com, address=null, version=1, deleted=0, sex=女)
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原文链接：https://blog.csdn.net/weixin_45730091/article/details/107361513