本文作者:Spring_ZYL
意见反馈:spring_zyl@163.com
文章来源:https://www.jianshu.com/u/1b5928185b73
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一、引入MyBatis依赖
在pom文件中引入MyBatis依赖
<!--引入MyBatis依赖-->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.3.2</version>
</dependency>
二、整合MyBatis(注解版)
1.创建Bean类
package com.demo.springboot.bean;
public class Users {
private Integer id;
private String username;
private String password;
private String phone;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getPhone() {
return phone;
}
public void setPhone(String phone) {
this.phone = phone;
}
}
2.创建Mapper接口
package com.demo.springboot.mapper;
import com.demo.springboot.bean.Users;
import org.apache.ibatis.annotations.*;
/**
* 表示此接口为操作数据库的Mapper接口
*/
@Mapper
public interface UsersMapper {
/**
* 插入一个用户
* @param user
* @return
*/
@Insert("insert into (username, password, phone) values (#{username}, #{password}, #{phone})")
public int insertUser(Users user);
/**
* 根据ID删除一个用户
* @param id
* @return
*/
@Delete("delete users where id = #{id}")
public int deleteUserById(Integer id);
/**
* 根据ID修改用户
* @param user
* @return
*/
@Update("update users set username = #{username}, password = #{password}, phone = #{phone} where id = #{id}")
public int updateUser(Users user);
/**
* 根据ID相询用户
* @param id
* @return
*/
@Select("select * from users where id = #{id}")
public Users queryUserById(Integer id);
}
3.创建Controller类(RESTful风格)
package com.demo.springboot.controller;
import com.demo.springboot.bean.Users;
import com.demo.springboot.mapper.UsersMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
@RestController
@RequestMapping("/mybatis")
public class MybatisController {
@Autowired
UsersMapper usersMapper;
/**
* 新增一个用户
* @param user
* @return
*/
@PostMapping("/user")
public Users insertUser(Users user) {
usersMapper.insertUser(user);
return user;
}
/**
* 修改一个用户
* @param user
* @return
*/
@PutMapping("/user")
public int updateUser(Users user){
return usersMapper.updateUser(user);
}
/**
* 删除一个用户
* @param id
* @return
*/
@DeleteMapping("/user/{id}")
public int deleteUserById(@PathVariable Integer id){
return usersMapper.deleteUserById(id);
}
/**
* 查询一个用户
* @param id
* @return
*/
@GetMapping("/user/{id}")
public Users selectUserById(@PathVariable Integer id){
return usersMapper.queryUserById(id);
}
}
4.使用Postman测试
(1)新增一个用户
测试地址:127.0.0.1:8080/mybatis/user
请求方式:POST
返回结果见如图:
1.png数据库增加了一条记录,如下图:
2.png(2)删除一个用户
测试地址:127.0.0.1:8080/mybatis/user/3
请求方式:DELETE
返回结果见下图:
3.png数据库中id为3的记录被删除,如下图:
4.png(3)修改一个用户
测试地址:127.0.0.1:8080/mybatis/user
请求方式:PUT
返回结果见下图:
6.png数据已更新,见如下图:
7.png(4)查询一个用户
测试地址:127.0.0.1:8080/mybatis/user/9
请求方式:GET
返回结果见下图:
5.png三、整合MyBatis(配置版)
1.创建部门表
11.png2.创建对应的JavaBean类
public class Dept {
private Integer id;
private String deptName;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getDeptName() {
return deptName;
}
public void setDeptName(String deptName) {
this.deptName = deptName;
}
}
3.创建Mapper接口
package com.demo.springboot.mapper;
import com.demo.springboot.bean.Dept;
import org.apache.ibatis.annotations.Options;
public interface DeptMapper {
public Integer insertDept(Dept dept);
public Dept selectDeptById(Integer id);
}
4.添加Controller
/**
* 插入一个部门
* @param dept
* @return
*/
@PostMapping("/dept")
public Dept insertDept(Dept dept){
deptMapper.insertDept(dept);
return dept;
}
@GetMapping("/dept/{id}")
public Dept findDeptById(@PathVariable Integer id){
return deptMapper.selectDeptById(id);
}
5.在application.yml添加mybatis配置
#配置mybatis
mybatis:
#mapper文件的位置
mapper-locations: classpath:mapper/**/*.xml
configuration:
#开启驼峰命名
map-underscore-to-camel-case: true
6.在SpringBoot启动类中添加怎么扫描mapper
@MapperScan("com.demo.springboot.mapper") // 定义扫描的mapper包
package com.demo.springboot;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@MapperScan("com.demo.springboot.mapper") // 定义扫描的mapper包
@SpringBootApplication
public class SpringbootJdbcApplication {
public static void main(String[] args) {
SpringApplication.run(SpringbootJdbcApplication.class, args);
}
}
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