Mybatis-plus读取JSON类型
版本:
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-boot-starter</artifactId>
<version>3.3.1.tmp</version>
</dependency>
一、Mybatis基本查询
共三个步骤:
1、在数据库表定义JSON字段;
2、在实体类加上@TableName(autoResultMap = true)、在JSON字段映射的属性加上@TableField(typeHandler = FastjsonTypeHandler.class);
3、建一些业务代码进行测试;
在数据库表定义JSON字段
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\"}]');
在实体类加上@TableName(autoResultMap = true)、在JSON字段映射的属性加上@TableField(typeHandler = FastjsonTypeHandler.class)
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;
}
}
建一些业务代码进行测试
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<>());
}
}
运行结果:
[
{
"id": 1,
"extraObject": { "id": 1, "name": "2" },
"extraList": [
{ "name": "2", "id": 1 }
],
"extraArray": [
{ "id": 1, "name": "2" }
]
}
]
二、nataive自义SQL查询
1、在实体类加上@TableName(autoResultMap = true)、在JSON字段映射的属性加上@TableField(typeHandler = FastjsonTypeHandler.class);
2、XXMapper.xml里json型字段到类的映射
<resultMap>
<result property="jsonDataField" column="json_data_field" jdbcType="OTHER" javaType="com.alibaba.fastjson.JSONObject" typeHandler="com.baomidou.mybatisplus.extension.handlers.FastjsonTypeHandler"/>
</resultMap>
实体类
package cc.oyz.bean;
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 io.swagger.annotations.ApiModelProperty;
import lombok.Data;
/**
* @description: 辖区管理
* @author: libin.hao
* @time: 2021/4/8 15:35
*/
@Data
@TableName(autoResultMap = true)
public class UrbanArea {
@TableId(value = "id",type = IdType.AUTO)
@ApiModelProperty(value = "主键ID",example="主键ID")
private Integer id;
private String name;
private Double height;
@ApiModelProperty(value = "地理数据")
private String geog;
@ApiModelProperty(value = "几何数据")
private String geometry;
@TableField(typeHandler = FastjsonTypeHandler.class)
private JSONObject destination;
@TableField(typeHandler = FastjsonTypeHandler.class)
private JSONObject orientation;
}
Mapper.xml文件
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="cc.oyz.mapper.UrbanAreaMapper" >
<resultMap id="BaseResultMap" type="cc.oyz.bean.UrbanArea" >
<id column="id" property="id" jdbcType="INTEGER" />
<result column="name" property="name" jdbcType="VARCHAR" />
<result column="height" property="height" jdbcType="DOUBLE" />
<result column="geog" property="geog" jdbcType="VARCHAR" />
<result column="geometry" property="geometry" jdbcType="VARCHAR" />
<result column="destination" property="destination" jdbcType="OTHER" javaType="com.alibaba.fastjson.JSONObject" typeHandler="com.baomidou.mybatisplus.extension.handlers.FastjsonTypeHandler" />
<result column="orientation" property="orientation" jdbcType="OTHER" javaType="com.alibaba.fastjson.JSONObject" typeHandler="com.baomidou.mybatisplus.extension.handlers.FastjsonTypeHandler" />
</resultMap>
<select id="selectOneByName" resultType="cc.oyz.bean.UrbanArea" resultMap="BaseResultMap">
SELECT
*,
ST_AsGeoJson ( geog ) AS geometry
FROM
urban_area
WHERE 1 = 1
<if test="name != null and name != ''">
AND name = #{name}
</if>
</select>
</mapper>