Mybatis-plus操作json字段实战教程

DROP TABLE IF EXISTS user;
CREATE TABLE user(
  id BIGINT(20) NOT NULL COMMENT '主键ID',
  name VARCHAR(30) NULL DEFAULT NULL COMMENT '姓名',
  age INT(11) NULL DEFAULT NULL COMMENT '年龄',
  email VARCHAR(50) NULL DEFAULT NULL COMMENT '邮箱',
  wallet VARCHAR(3000) NULL DEFAULT NULL COMMENT '钱包',
  other_info VARCHAR(3000) NULL DEFAULT NULL COMMENT '其他信息',
  PRIMARY KEY (id)
);


INSERT INTO user (id, name, age, email, wallet, other_info) VALUES
(1, 'Jone', 18, 'test1@baomidou.com', '{"name": "支付宝钱包","currencyList": [{"type": "USD","amount": 999.19},{"type": "RMB","amount": 1000.19}]}', '{"sex": "男","city": "南昌"}'),
(2, 'Jack', 20, 'test2@baomidou.com', '{"name": "微信钱包","currencyList": [{"type": "USD","amount": 888.18},{"type": "RMB","amount": 1000.18}]}', '{"sex": "男","city": "青岛"}');

INSERT INTO user (id, name, age, email, wallet, other_info) VALUES
(1, 'Jone', 18, 'test1@baomidou.com', '{"name": "支付宝钱包","currencyList": [{"type": "USD","amount": 999.19},{"type": "RMB

(2, 'Jack', 20, 'test2@baomidou.com', '{"name": "微信钱包","currencyList": [{"type": "USD","amount": 888.18},{"type": "RMB","amount": 1000.18}]}', '{"sex": "男","city": "青岛"}');

import com.baomidou.mybatisplus.annotation.TableField;
import com.baomidou.mybatisplus.annotation.TableName;
import com.baomidou.mybatisplus.extension.handlers.FastjsonTypeHandler;
import com.baomidou.mybatisplus.extension.handlers.JacksonTypeHandler;
import lombok.Data;
import lombok.experimental.Accessors;
/**用户实体对应表 user
 * @author hubin
 * @since 2018-08-11
 */
@Data
@Accessors(chain = true)
@TableName(autoResultMap = true)
public class User {
    private Long id;
    private String name;
    private Integer age;
    private String email;

    /**
     * 注意！！必须开启映射注解
     *
     * @TableName(autoResultMap = true)
     *
     * 以下两种类型处理器，二选一 也可以同时存在
     *
     * 注意！！选择对应的 JSON 处理器也必须存在对应依赖包
     */
    @TableField(typeHandler = JacksonTypeHandler.class)
    private Wallet wallet;


    @TableField(typeHandler = FastjsonTypeHandler.class)
    private OtherInfo otherInfo;
}

package com.baomidou.mybatisplus.samples.typehandler.entity;
import java.util.List;
import lombok.Data;

/**
 * 钱包
 */
@Data
public class Wallet {
    /**
     * 名称
     */
    private String name;
    /**
     * 各种货币
     */
    private List<Currency> currencyList;
}

package com.baomidou.mybatisplus.samples.typehandler.entity;

import lombok.Data;

/**
 * 货币
 */
@Data
public class Currency {
    /**
     * 类型: 人民币 RMB , 美元 USD
     */
    private String type;
    /**
     * 金额
     */
    private Double amount;
}

package com.baomidou.mybatisplus.samples.typehandler.entity;
import lombok.Data;

/**
 * 其他信息
 */
@Data
public class OtherInfo {
    /**
     * 性别
     */
    private String sex;
    /**
     * 居住城市
     */
    private String city;
}

package com.baomidou.mybatisplus.samples.typehandler.mapper;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.baomidou.mybatisplus.samples.typehandler.entity.User;

/**
 * <p>
 * MP 支持不需要 UserMapper.xml 这个模块演示内置 CRUD 咱们就不要 XML 部分了
 * </p>
 *
 * @author hubin
 * @since 2018-08-11
 */
public interface UserMapper extends BaseMapper<User> {
}

package com.baomidou.mybatisplus.samples.typehandler.config;
import com.baomidou.mybatisplus.extension.handlers.GsonTypeHandler;
import com.baomidou.mybatisplus.extension.handlers.JacksonTypeHandler;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.google.gson.Gson;
import org.springframework.boot.CommandLineRunner;
import org.springframework.stereotype.Component;

/**
 * @author miemie
 * @since 2019-11-28
 */
@Component
public class MpJsonConfig implements CommandLineRunner {

    /**
     * 可以set进去自己的
     */
    @Override
    public void run(String... args) throws Exception {
        JacksonTypeHandler.setObjectMapper(new ObjectMapper());
        GsonTypeHandler.setGson(new Gson());
    }
}

package com.baomidou.mybatisplus.samples.typehandler;
import javax.annotation.Resource;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

import com.baomidou.mybatisplus.samples.typehandler.entity.User;
import com.baomidou.mybatisplus.samples.typehandler.mapper.UserMapper;

/**
 * <p>
 * 内置 类型处理器 演示
 * </p>
 *
 * @author hubin
 * @since 2018-08-11
 */
@RunWith(SpringRunner.class)
@SpringBootTest
public class SampleTest {

    @Resource
    private UserMapper userMapper;

    /**
     * 自定义类型处理器演示参考 mybatis-plus-sample-deluxe 模块
     */
    @Test
    public void test() {
        User Jone = userMapper.selectById(1);
        System.out.println(Jone);
        System.err.println(Jone.getName());

        User Jack = userMapper.selectById(1);
        System.err.println(Jack.getName());
    }
}​​​​​