MyBatisPlus映射匹配兼容性

字段映射与表名映射

1、当数据库表名tbl_user与实体类名User不一致时：在实体类上添加 ：@TableName("tbl_user")

package com.itheima.domain;

import com.baomidou.mybatisplus.annotation.TableName;
import lombok.Data;

@Data
@TableName("tbl_user")
public class User {
    private Long id;
    private String name;
    private String password;
    private Integer age;
    private String tel;
}

2、当数据库字段名password与实体类属性名不一致pwd时，在实体类属性上添加：@TableField(value = "pwd")

package com.itheima.domain;

import com.baomidou.mybatisplus.annotation.TableField;
import com.baomidou.mybatisplus.annotation.TableName;
import lombok.Data;

@Data
@TableName("tbl_user")
public class User {
    private Long id;
    private String name;
    @TableField(value = "pwd")
    private String password;
    private Integer age;
    private String tel;
}

3、当实体类中的属性online在数据库表字段中不存在时:在online属性上添加：@TableField(exist = false)

package com.itheima.domain;

import com.baomidou.mybatisplus.annotation.TableField;
import com.baomidou.mybatisplus.annotation.TableName;
import lombok.Data;

@Data
@TableName("tbl_user")
public class User {
    private Long id;
    private String name;
    @TableField(value = "pwd")
    private String password;
    private Integer age;
    private String tel;
    @TableField(exist = false)
    private Integer online;
}

4、设置pwd不被查询：在pwd上添加：@TableField(value = "pwd", select = false)

package com.itheima.domain;

import com.baomidou.mybatisplus.annotation.TableField;
import com.baomidou.mybatisplus.annotation.TableName;
import lombok.Data;

@Data
@TableName("tbl_user")
public class User {
    private Long id;
    private String name;
    @TableField(value = "pwd", select = false)
    private String password;
    private Integer age;
    private String tel;
    @TableField(exist = false)
    private Integer online;
}