SpringBoot+mybatis实现增删改查
1.创建一个项目。
2.用mybatis逆向工程创建，还不会逆向工程的看我上一篇文章
Mybatis逆向工程创建方法
3.创建好会有如下图的三个文件
4.新建一个controller文件夹在里面新建一个PersonController类。
5.编写如下代码：
package com.springboot.controller;
import com.springboot.beans.HttpResponseEntity;
import com.springboot.common.Constans;
import com.springboot.dao.entity.PersonEntity;
import com.springboot.service.PersonService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class PersonController {
@Autowired//注入（自动找Service）
/**
* 实例化Service
*/
private PersonService personService;
//查询数据操作
@RequestMapping(value = "/selectPerson",method = RequestMethod.POST,headers = "Accept=application/json")
public HttpResponseEntity selectPerson(@RequestBody PersonEntity personEntity){
HttpResponseEntity httpResponseEntity = new HttpResponseEntity ();
try {
PersonEntity selectPerson = personService.selectPerson(personEntity);
httpResponseEntity.setData ( selectPerson );
httpResponseEntity.setCode(Constans.SUCCESS_CODE);//自定义成功状态码
httpResponseEntity.setMessage(Constans.SELECT_SUCCESS_MESSAGE);//自定义成功状态消息
} catch (Exception e) {
httpResponseEntity.setCode(Constans.ADD_EXIST_CODE);//自定义失败状态码
httpResponseEntity.setMessage(Constans.SELECT_EXIST_MESSAGE);//自定义失败状态消息
}
return httpResponseEntity;
}
//----------------同理下面代码----------------
//增加数据操作
@RequestMapping(value = "/addPerson",method = RequestMethod.POST,headers = "Accept=application/json")
public HttpResponseEntity addPerson(@RequestBody PersonEntity personEntity){
HttpResponseEntity httpResponseEntity = new HttpResponseEntity ();
try{
int addInfoPerson = personService.addPerson(personEntity);
httpResponseEntity.setData ( addInfoPerson );
httpResponseEntity.setCode(Constans.SUCCESS_CODE);
httpResponseEntity.setMessage(Constans.ADD_SUCCESS_MESSAGE);
}catch (Exception e){
httpResponseEntity.setCode(Constans.ADD_EXIST_CODE);
httpResponseEntity.setMessage(Constans.ADD_EXIST_MESSAGE);
}
return httpResponseEntity;
}
//删除数据操作
@RequestMapping(value = "/deletePerson",method = RequestMethod.POST,headers = "Accept=application/json")
public HttpResponseEntity deletePerson(@RequestBody PersonEntity personEntity){
HttpResponseEntity httpResponseEntity = new HttpResponseEntity ();
try{
int deleteInfoPerson = personService.deletePerson(personEntity);
httpResponseEntity.setData ( deleteInfoPerson );
httpResponseEntity.setCode(Constans.SUCCESS_CODE);
httpResponseEntity.setMessage(Constans.DELETE_SUCCESS_MESSAGE);
}catch (Exception e){
httpResponseEntity.setCode(Constans.ADD_EXIST_CODE);
httpResponseEntity.setMessage(Constans.DELETE_EXIST_MESSAGE);
}
return httpResponseEntity;
}
//修改数据操作
@RequestMapping(value = "/updatePerson",method = RequestMethod.POST,headers = "Accept=application/json")
public HttpResponseEntity updatePerson(@RequestBody PersonEntity personEntity){
HttpResponseEntity httpResponseEntity = new HttpResponseEntity();
try{
int updateInfoPerson = personService.updatePerson(personEntity);
httpResponseEntity.setData(updateInfoPerson);
httpResponseEntity.setCode(Constans.SUCCESS_CODE);
httpResponseEntity.setMessage(Constans.UPDATE_SUCCESS_MESSAGE);
}catch (Exception e){
httpResponseEntity.setCode(Constans.ADD_EXIST_CODE);
httpResponseEntity.setMessage(Constans.UPDATE_EXIST_MESSAGE);
}
return httpResponseEntity;
}
}
6.新建一个service文件夹，在里面新建一个PersonService类
代码如下：
package com.springboot.service;
import com.springboot.dao.PersonEntityMapper;
import com.springboot.dao.entity.PersonEntity;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
@Service
public class PersonService {
@Autowired
private PersonEntityMapper personEntityMapper;
@Transactional
/*
根据ID查询信息
*/
public PersonEntity selectPerson(PersonEntity personEntity){
PersonEntity personInfoEntity = personEntityMapper.selectPerson(personEntity.getId () );
return personInfoEntity;
}
/*
添加信息
*/
public int addPerson(PersonEntity personEntity) {
int personInfoEntity = personEntityMapper.addPerson(personEntity);
return personInfoEntity;
}
/*
根据ID删除信息
*/
public int deletePerson(PersonEntity personEntity) {
int personInfoEntity = personEntityMapper.deletePerson(personEntity.getId ());
return personInfoEntity;
}
/*
修改信息
*/
public int updatePerson(PersonEntity personEntity) {
int personInfoEntity = personEntityMapper.updatePerson(personEntity);
return personInfoEntity;
}
}
7.我们在PersonEntityMapper接口里面写上
如下代码：
package com.springboot.dao;
import com.springboot.dao.entity.PersonEntity;
import org.springframework.stereotype.Repository;
@Repository
public interface PersonEntityMapper {
/**
* This method was generated by MyBatis Generator.
* This method corresponds to the database table person
*
* @mbg.generated
*/
int deleteByPrimaryKey(String id);
/**
* This method was generated by MyBatis Generator.
* This method corresponds to the database table person
*
* @mbg.generated
*/
int insert(PersonEntity record);
/**
* This method was generated by MyBatis Generator.
* This method corresponds to the database table person
*
* @mbg.generated
*/
int insertSelective(PersonEntity record);
/**
* This method was generated by MyBatis Generator.
* This method corresponds to the database table person
*
* @mbg.generated
*/
PersonEntity selectByPrimaryKey(String id);
/**
* This method was generated by MyBatis Generator.
* This method corresponds to the database table person
*
* @mbg.generated
*/
int updateByPrimaryKeySelective(PersonEntity record);
/**
* This method was generated by MyBatis Generator.
* This method corresponds to the database table person
*
* @mbg.generated
*/
int updateByPrimaryKey(PersonEntity record);
//----------------------------下面四句需要我们来自己写--------------------------------------------------
PersonEntity selectPerson(String id);
int addPerson(PersonEntity personEntity);
int deletePerson(String id);
int updatePerson(PersonEntity personEntity);
}
8.下面我们需要在PersonEntityMapper.xml里面进行配置
因为PersonEntityMapper.xml文件用逆向工程可以自动创建，我们只需要修改id就行。也可以根据自己的实际情况修改SQL语句。
这里我们以查询为例，删除，增加，修改都类似。
<select id="selectPerson" parameterType="java.lang.String" resultMap="BaseResultMap">
<!--
WARNING - @mbg.generated
This element is automatically generated by MyBatis Generator, do not modify.
-->
select
<include refid="Base_Column_List" />
from person
where id = #{id,jdbcType=VARCHAR}
</select>
说明：id="selectPerson"里面的selectPerson为PersonController类里面
value = “/selectPerson” 这个。
这样就算全部完成了
9.附赠自定义状态码类
package com.springboot.common;
public class Constans {
/**
* Descriptions:公用成功失败状态码
*/
public static final String SUCCESS_CODE = "666"; //成功状态码
public static final String ADD_EXIST_CODE = "20001"; //失败状态码
public static final String ADD_EXIST_MESSAGE = "添加失败"; //添加失败
public static final String SELECT_EXIST_MESSAGE ="查询失败";
public static final String SELECT_SUCCESS_MESSAGE ="查询成功";
public static final String ADD_SUCCESS_MESSAGE ="添加成功";
public static final String UPDATE_EXIST_MESSAGE ="修改失败";
public static final String UPDATE_SUCCESS_MESSAGE ="修改成功";
public static final String DELETE_EXIST_MESSAGE ="删除失败";
public static final String DELETE_SUCCESS_MESSAGE ="删除成功";
}
10.接下来我们用Postman进行测试
首先我们先增加3条数据
说明:本机IP地址+:8080+/+接口名（如：查询接口selectPerson，修改接口updatePerson，删除接口deletePerson，增加接口addPerson）
这样数据库中也可以看到
接下来我们进行修改
下面进行删除操作
删除ID为3的数据
进行查找操作
查找ID为1的数据
表演完事
。。。。。。。。。。。。。。开溜。。。