本文着重讲解了mybatis-plus读取JSON类型的方法实现，文中通过代码实例讲解的非常细致，对大家的工作和学习具有一定的参考学习价值，需要的朋友们下面随着小编来一起学习学习吧
摘要：mybatis-plus读取JSON类型。
本文总共三个步骤：
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" }
]
}
]
