IDEA实现Mybatis
1.代码编写
创建spring项目,选择如下图依赖
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在项目中的resources文件夹下,删除原有的application.properties文件 新建 application.yml
spring:
profiles:
active: dev
application-dev.yml
server:
port: 8080
spring:
datasource:
username: root
password: 1206
url: jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf-8&useSSL=true&serverTimezone=UTC
driver-class-name: com.mysql.cj.jdbc.Driver
mybatis:
mapper-locations: classpath:mapping/*Mapper.xml
type-aliases-package: com.example.mybatiswork.entity
#showSql
logging:
level:
com:
example:
mapper : debug
接着新建mapping文件夹,新建一个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="com.example.mybatiswork.mapper.UserMapper">
<resultMap id="BaseResultMap" type="com.example.mybatiswork.entity.User">
<result column="id" jdbcType="INTEGER" property="id" />
<result column="userName" jdbcType="VARCHAR" property="userName" />
<result column="passWord" jdbcType="VARCHAR" property="passWord" />
<result column="realName" jdbcType="VARCHAR" property="realName" />
</resultMap>
<select id="Sel" resultType="com.example。mybatiswork.entity.User">
select * from user where id = #{id}
</select>
</mapper>
接着在主文件夹下新建controller、mapper、entity、service包 UserController.java
package com.example.demo.controller;
import com.example.mybatiswork.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
@RequestMapping("/testBoot")
public class UserController {
@Autowired
private UserService userService;
@RequestMapping("getUser/{id}")
public String GetUser(@PathVariable int id){
return userService.Sel(id).toString();
}
}
entity包的User.java
package com.example.demo.entity;
public class User {
private Integer id;
private String userName;
private String passWord;
private String realName;
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 getRealName() {
return realName;
}
public void setRealName(String realName) {
this.realName = realName;
}
@Override
public String toString() {
return "User{" +
"id=" + id +
", userName='" + userName + '\'' +
", passWord='" + passWord + '\'' +
", realName='" + realName + '\'' +
'}';
}
}
UserService.java
package com.example.demo.service;
import com.example.mybatiswork.entity.User;
import com.example.mybatiswork.mapper.UserMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
@Service
public class UserService {
@Autowired
UserMapper userMapper;
public User Sel(int id){
return userMapper.Sel(id);
}
}
UserMapper.java
package com.example.demo.mapper;
import com.example.mybatiswork.entity.User;
import org.apache.ibatis.annotations.Mapper;
@Mapper
public interface UserMapper {
User Sel(int id);
}
MybatisworkApplication
package com.example.demo;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@MapperScan("com.example.mybatiswork.mapper")
@SpringBootApplication
public class MybatisworkApplication {
public static void main(String[] args) {
SpringApplication.run(MybatisworkApplication.class, args);
}
}
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