MyBatisPlus--通用枚举

通用枚举

MyBatisPlus解决了繁琐的配置，让MyBatis更优雅的适用枚举属性。

配置枚举类扫描包

# 配置枚举扫描包
mybatis-plus.type-enums-package=psers.zhang.demo.enums

枚举类(实现IEnum<T>)

public enum SexEnum implements IEnum<Integer> {

    MALE(1, "男"),
    FEMALE(0, "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;
    }
}

表结构

实体类

@Data
@NoArgsConstructor
@AllArgsConstructor
@TableName("tb_user")
public class User extends Model<User> {

    //指定主键为自增
    @TableId(type = IdType.AUTO)
    private Long id;

    //指定数据表中字段名
    @TableField(value = "user_name")
    private String userName;

    @TableField(fill = FieldFill.INSERT)
    private String password;
    private String name;
    private Integer age;
    private String email;

    //逻辑删除字段： 0，未删除； 1，已删除
    @TableLogic //标记为逻辑删除字段
    private Integer deleted;


    //性别，枚举类型：1，男； 0，女
    private SexEnum sex;


    //指定该字段在表中是不存在的
    @TableField(exist = false)
    private String address;
}

测试

插入数据：自动将枚举映射为字段值

	@Test
    public void testInsert(){
        User user = new User();
        user.setEmail("[email protected]");
        user.setAge(18);
        user.setName("diaochan");
        user.setUserName("貂蝉");
        user.setPassword("123456");
        user.setSex(SexEnum.FEMALE);
        user.setDeleted(0);
        //返回受影响的行数
        int rows = userMapper.insert(user);
        System.out.println(rows);

        //获取自增长后的id值,MP会自动回填自增后的id
        System.out.println(user.getId());
    }

查询：自动将字段值映射为枚举值

@Test
    public void testSelectList(){
        List<User> users = userMapper.selectList(null);
        for (User u : users)
            System.out.println(u);
    }

控制台打印：

Execute SQL：
    SELECT
        id,
        user_name,
        password,
        name,
        age,
        email,
        deleted,
        sex 
    FROM
        tb_user 
    WHERE
        deleted=0

User(id=4, userName=zhaoliu, password=123456, name=赵六, age=48, email=test4@qq.com, deleted=0, sex=男, address=null)
User(id=5, userName=小强, password=88888, name=xiaoqiang, age=30, email=123456@qq.com, deleted=0, sex=男, address=null)
User(id=6, userName=貂蝉, password=123456, name=diaochan, age=18, email=123456@qq.com, deleted=0, sex=女, address=null)