Mybatis-Plus：通用枚举

Posted 2022-03-18 CodeJiao

1. 通用枚举

解决了繁琐的配置，让 mybatis 优雅的使用枚举属性

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1.1 修改表结构

为tb_user表增加sex字段，用于表示用户的性别，1表示是男生，2表示是女生。

Navicat执行下列SQL语句：

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

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1.2 定义枚举

SexEnum.java

package com.tian.enums;

import com.baomidou.mybatisplus.core.enums.IEnum;

public enum SexEnum implements IEnum<Integer> 

    MAN(1, "男"),
    WOMAN(2, "女");

    private final int value;
    private final 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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1.3 配置枚举

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

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1.4 修改实体

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1.5 测试

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1.5.1 插入枚举数据

SpringbootMybatisplusApplicationTests.java

    @Test
    public void testInsert() 
        User user = new User();
        user.setName("貂蝉");
        user.setUserName("diaochan");
        user.setPassword("123456");
        user.setAge(20);
        user.setEmail("[e-mail]");

        // 设置貂蝉为女生
        user.setSex(SexEnum.WOMAN);

        int result = this.userMapper.insert(user);
        System.out.println("result = " + result);
    

运行结果：

生成的sql语句为：INSERT INTO tb_user ( id, user_name, password, name, age, email, sex ) VALUES ( ?, ?, ?, ?, ?, ?, ? )

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1.5.2 查询枚举数据

SpringbootMybatisplusApplicationTests.java

    @Test
    public void testSelectBySex() 
        QueryWrapper<User> wrapper = new QueryWrapper<>();
        wrapper.eq("sex", SexEnum.WOMAN);
        List<User> users = this.userMapper.selectList(wrapper);
        for (User user : users) 
            System.out.println(user);
        
    

运行结果：

生成的sql语句为：SELECT id,user_name,password,name,age,email,sex FROM tb_user WHERE (sex = ?)

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