Springboot整合mybatis的步骤
作者：つ九键按三下
这篇文章主要介绍了Springboot整合mybatis的步骤，帮助大家更好的理解和学习使用
前期工作
1.导入mybatis整合依赖
<!-- mybatis整合 -->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.1.4</version>
</dependency>
2.连接数据库
3.连接完数据库就去applicaton.yml配置一下数据库
spring:
datasource:
username: root
password: 123456
url: jdbc:mysql://localhost:3306/mybatis?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8
driver-class-name: com.mysql.cj.jdbc.Driver
开始整合
1.编写与数据库对应的实体类
package com.example.pojo;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
@Data
@AllArgsConstructor
@NoArgsConstructor
public class User {
private Integer id;
private String name;
private String pwd;
}
为了偷懒，导入了lombok
<!-- lombok -->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</dependency>
2.编写mapper
package com.example.mapper;
import com.example.pojo.User;
import org.apache.ibatis.annotations.Mapper;
import org.springframework.stereotype.Repository;
import java.util.List;
@Mapper
@Repository
public interface UserMapper {
//查询用户的全部信息
List<User> getUserList();
//select 找出id=1的用户
User getUserById(int id);
//insert 增加一个用户
int insertUser(User user);
//delete 删除id=4的用户
int deleteUser(int id);
//update 将id=2的用户名字改为小龙
int updateUser(User user);
}
3.编写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="com.example.mapper.UserMapper">
<select id="getUserList" resultType="user">
select *
from mybatis.user
</select>
<select id="getUserById" resultType="user" parameterType="int">
select *
from mybatis.user
where id = #{id};
</select>
<insert id="insertUser" parameterType="user">
insert into mybatis.user (id, name, pwd)
values (#{id}, #{name}, #{pwd});
</insert>
<delete id="deleteUser" parameterType="int">
delete
from mybatis.user
where id = #{id};
</delete>
<update id="updateUser" parameterType="user">
update mybatis.user
set name = #{name},
pwd = #{pwd}
where id = #{id};
</update>
</mapper>
这里我们用了别名而且我们把这个mapper.xml文件放在了resources目录下，所以我们要去application.yml配置一下
mybatis: type-aliases-package: com.example.pojo mapper-locations: classpath:mybatis/mapper/*.xml
mapper.xml文件编写的位置：
4.编写controller
package com.example.controller;
import com.example.mapper.UserMapper;
import com.example.pojo.User;
import org.apache.ibatis.annotations.Param;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;
import java.util.List;
@RestController
public class UserController {
@Autowired
private UserMapper userMapper;
@GetMapping("/getUserList")
public List<User> getUserList(){
return userMapper.getUserList();
}
@GetMapping("/getUserById/{id}")
public User getUserById(@PathVariable("id") int id){
return userMapper.getUserById(id);
}
@GetMapping("/insertUser")
public String insertUser(){
userMapper.insertUser(new User(5,"xiaoming","111"));
return "ok";
}
@GetMapping("/deleteUser")
public String deleteUser(){
userMapper.deleteUser(5);
return "ok";
}
@GetMapping("/updateUser")
public String updateUser(){
userMapper.updateUser(new User(5,"xx","111"));
return "ok";
}
}
5.进行测试
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