Mybatis-Plus读写Mysql的Json字段

文章目录

• 前置条件
• 一、新建mysql表增加json字段
• 二、pojo类
• 三、测试类

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前置条件

确保mysql的版本是5.7+

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一、新建mysql表增加json字段

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二、pojo类

package com.cxstar.domain;

import com.alibaba.fastjson.JSONObject;
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.Date;

@lombok.Data
@TableName(autoResultMap = true)
public class Data implements Serializable {

    @TableId(value = "id",type = IdType.AUTO)
    private Integer id;       
	
	// 部分字段省略-------------
    private String title;       
    private String author;         
    private String publisher; 
    // -----------------------   

    @TableField(typeHandler = FastjsonTypeHandler.class)
    private JSONObject aggJson;

}

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三、测试类

package com.cxstar;

import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.cxstar.domain.Data;
import com.cxstar.domain.SearchMsg;
import com.cxstar.mapper.DataMapper;
import com.cxstar.service.OrderService;
import com.cxstar.service.spider.impl.*;
import com.cxstar.service.utils.ExecutorThread;
import com.cxstar.service.utils.SpiderThread;
import com.cxstar.service.utils.SynContainer;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

import java.util.ArrayList;
import java.util.Date;
import java.util.UUID;

@SpringBootTest
class OrderApplicationTests {

    @Autowired
    DataMapper dataMapper;

    @Test
    void testJson() {
		// insert -----------------------------------
        Data data = new Data();
        data.setTitle("计算机安全技术与方法");
        data.setPublisher("<<计算机技术>>编辑部出版");

        JSONObject jb = new JSONObject();
        jb.put("searchKey", "英格");
        jb.put("curPage", "1");
        JSONArray js = new JSONArray();
        js.add("西北政法大学");
        js.add("西安理工大学");
        jb.put("source", js);
        data.setAggJson(jb);

        dataMapper.insert(data);
        // ------------------------------------------

        // select --------------------------------------
        Data data1 = dataMapper.selectById(5837);
        JSONObject jb2 = data1.getAggJson();
        System.out.println(jb2.getJSONArray("source"));
        // ---------------------------------------------
		
		// group by -----------------------------------------------
		LambdaQueryWrapper<Data> lqw = new LambdaQueryWrapper<>();
        lqw.select(Data::getAggJson);
        lqw.groupBy(Data::getAggJson);
        List<Data> dataList = dataMapper.selectList(lqw);
        System.out.println(dataList);
        // --------------------------------------------------------
    }

}