mysql8+mybatis-plus 查询json格式数据

sql 测试json表

CREATE TABLE `testjson` (
  `id` int NOT NULL AUTO_INCREMENT,
  `json_obj` json DEFAULT NULL,
  `json_arr` json DEFAULT NULL,
  `json_str` varchar(100) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;

INSERT INTO test2.testjson
(id, json_obj, json_arr, json_str)
VALUES(1, '{"age": "1", "sex": "123"}', '[1, 2, 4]', '12');
INSERT INTO test2.testjson
(id, json_obj, json_arr, json_str)
VALUES(2, '{"age": "1", "sex": "123"}', '[1, 2, 4]', '12');
INSERT INTO test2.testjson
(id, json_obj, json_arr, json_str)
VALUES(3, '{"age": "1", "sex": "123"}', '[1, 2, 4]', '12');
INSERT INTO test2.testjson
(id, json_obj, json_arr, json_str)
VALUES(4, '{"age": "1", "sex": "123"}', '[1, 2, 4]', '12');
INSERT INTO test2.testjson
(id, json_obj, json_arr, json_str)
VALUES(5, '{"age": "1", "sex": "123"}', '[1, 2, 4]', '12');

后台springboot 文件pom.xml

    4.0.0
    
        org.springframework.boot
        spring-boot-starter-parent
        2.1.6.RELEASE
         
    
    com.example
    springboot-test
    0.0.1-SNAPSHOT
    demo
    Demo project for Spring Boot
    
        8
    
    
        
            org.springframework.boot
            spring-boot-starter-web
        
        
            com.baomidou
            mybatis-plus-boot-starter
            3.3.0
        
        
            mysql
            mysql-connector-java
            8.0.11
        
        
            org.projectlombok
            lombok
        
    

    
        
            
                org.springframework.boot
                spring-boot-maven-plugin
            
        
    

application.yml

spring:
    dataSource:
        driver-class-name: com.mysql.cj.jdbc.Driver
        password: root
        url: jdbc:mysql://localhost:3307/test2?characterEncoding=utf8&useSSL=false&serverTimezone=UTC&rewriteBatchedStatements=true
        username: root

实体类User.java

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.JacksonTypeHandler;
import lombok.Data;

import java.io.Serializable;

@Data
@TableName(value = "testjson", autoResultMap=true)
public class User implements Serializable {
    private static final long serialVersionUID = 1L;

    @TableId(value = "id", type = IdType.AUTO)
    private Long id;
    @TableField(typeHandler = JacksonTypeHandler.class)
    private JsonObj jsonObj;
    private String jsonArr;
    private String jsonStr;



}

JsonObj,java

@Data
public class JsonObj {
    private String sex;
    private Integer age;
}

UserMapper.java

@Mapper
public interface UserMapper extends BaseMapper {

    User selectById(Long id);
    User selectByLike(String sex);

    
        
        
        
        
    

    
        select *from testjson where `id`=#{id}
    

    
       select * from testjson where json_obj->'$.sex' like '%'+#{sex}'+%'
    

import com.springboot.mapper.UserMapper;
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;

@RestController
public class TestController {

    @Autowired
    UserMapper userMapper;

   

    @GetMapping("/testJson")
    public String testJson(){
        return "User===:"+userMapper.selectById(1L);
    }
    @GetMapping("/testJsonLike")
    public String testJsonLike(){
        return "User===:"+userMapper.selectByLike("123");
    }
}

备注：常用JSON函数

//插入和更新

JSON_SET和JSON_INSERT区别：set key存在会覆盖value,insert只会插入新的key,value

UPDATE testjson SET json_obj = JSON_SET(json_obj,'$.age','localhost','$.url','www.muscleape.com') WHERE id = 2;

UPDATE testjson SET json_obj = JSON_INSERT(json_obj,'$.url','www.test.com') WHERE id = 3;

//remove元素

UPDATE testjson SET json_obj = json_remove(json_obj, '$.age') WHERE id = 5;

//模糊查询

select * from testjson where json_obj->'$.url' like '%muscleape%'