mybatis plus实体类中字段映射mysql中的json格式方式

目录

• mybatis plus实体类中字段映射mysql中的json格式
  • 1.实体类中有个属性是其他对象
  • 2.那么取出时怎么进行映射呢，有分为两种情况
• mybatis-plus 实体 json 处理
  • 本文总共三个步骤

@TableField(typeHandler = JacksonTypeHandler.class) 

@TableField(typeHandler = JacksonTypeHandler.class)

@Data
@Accessors(chain = true)
@TableName(value = "wx_user",autoResultMap = true)

CREATE TABLE `extra_info`  (
  `id` int(10) NOT NULL AUTO_INCREMENT PRIMARY KEY,
  `extra_object` json NULL,
  `extra_list` json NULL,
  `extra_array` json NULL
); 
INSERT INTO `extra_info` VALUES (1, "{"id": 1, "name": "2"}", "[{"id": 1, "name": "2"}]", "[{"id": 1, "name": "2"}]");

import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableField;
import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableName;
import com.baomidou.mybatisplus.extension.handlers.FastjsonTypeHandler; 
import java.io.Serializable;
import java.util.List;
 
@TableName(autoResultMap = true)
public class ExtraInfo implements Serializable {
 
    @TableId(type = IdType.AUTO)
    private Integer id;
 
    @TableField(typeHandler = FastjsonTypeHandler.class)
    private ExtraNode extraObject;
 
    @TableField(typeHandler = FastjsonTypeHandler.class)
    private List<ExtraNode> extraList;
 
    @TableField(typeHandler = FastjsonTypeHandler.class)
    private ExtraNode[] extraArray;
 
    public Integer getId() {
        return id;
    }
 
    public void setId(Integer id) {
        this.id = id;
    }
 
    public ExtraNode getExtraObject() {
        return extraObject;
    }
 
    public void setExtraObject(ExtraNode extraObject) {
        this.extraObject = extraObject;
    }
 
    public List<ExtraNode> getExtraList() {
        return extraList;
    }
 
    public void setExtraList(List<ExtraNode> extraList) {
        this.extraList = extraList;
    }
 
    public ExtraNode[] getExtraArray() {
        return extraArray;
    }
 
    public void setExtraArray(ExtraNode[] extraArray) {
        this.extraArray = extraArray;
    }
}

import java.io.Serializable; 
public class ExtraNode implements Serializable { 
    private Integer id;
    private String name; 
    public Integer getId() {
        return id;
    }
 
    public void setId(Integer id) {
        this.id = id;
    }
 
    public String getName() {
        return name;
    }
 
    public void setName(String name) {
        this.name = name;
    }
}

import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import org.springframework.stereotype.Repository;
 
@Repository
public interface ExtraInfoMapper extends BaseMapper<ExtraInfo> {
}

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController; 
import java.util.List;
 
@RestController
@RequestMapping("/test")
public class TestController { 
    @Autowired
    private ExtraInfoMapper extraInfoMapper;
 
    @GetMapping
    public List<ExtraInfo> listAll() {
        return this.extraInfoMapper.selectList(new LambdaQueryWrapper<>());
    }
}