Mybatis-Plus通用枚举 Mybatis-Plus通用枚举的使用详解

时间:2021-03-16 ME_邱康人气:5

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解决了繁琐的配置，让 mybatis 优雅的使用枚举属性！

修改表结构

ALTER TABLE `tb_user` ADD COLUMN `sex` INT ( 1 ) NULL DEFAULT 1 COMMENT '1-男，2-女' AFTER `deleted`;

定义枚举

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;
 }

}

配置

# 枚举包扫描
mybatis-plus.type-enums-package=cn.com.javakf.enums

修改实体

private SexEnum sex; // 性别，枚举类型

测试

插入

@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);
}

SQL

[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

查询

@Test
public void testSelectById() {
 User user = new User();
 user.setId(11L);

 User user1 = user.selectById();
 System.out.println(user1);
}

SQL

[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)

从测试可以看出，可以很方便的使用枚举了。

条件查询

@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);
 }
}

SQL

[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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