Mybatis-Plus中如何详细运用通用枚举功能？

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解决了繁琐的配置，让MyBatis优雅地使用枚举特性！修改表结构，使用ALTER TABLE命令为`tb_user`表添加`sex`列：sqlALTER TABLE `tb_user` ADD COLUMN `sex` INT(1) NULL DEFAULT 1 COMMENT '1-男，2-女' AFTER `deleted`;定义枚举`SexEnum`：javapublic enum SexEnum implements IEnum { MALE(1, 男), FEMALE(2, 女);

private final int code; private final String description;

SexEnum(int code, String description) { this.code=code; this.description=description; }

@Override public int getCode() { return code; }

@Override public String getDescription() { return description; }}

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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