SpringBoot整合MyBatis

整合MyBatis

官方文档：http://mybatis.org/spring-boot-starter/mybatis-spring-boot-autoconfigure/

Maven仓库地址：https://mvnrepository.com/artifact/org.mybatis.spring.boot/mybatis-spring-boot-starter/2.1.4

16.1、整合测试

1、导入 MyBatis 所需要的依赖

<dependency>
    <groupId>org.mybatis.spring.boot</groupId>
    <artifactId>mybatis-spring-boot-starter</artifactId>
    <version>2.1.4</version>
</dependency>

2、配置数据库连接信息（不变）

spring:
  datasource:
    username: root
    password: 123456
    #?serverTimezone=UTC解决时区的报错
    url: jdbc:mysql://localhost:3306/shop?serverTimezone=UTC&usxeUnicode=true&characterEncoding=utf-8
    driver-class-name: com.mysql.cj.jdbc.Driver

mybatis:
  type-aliases-package: com.saxon.demo.pojo
  mapper-locations: classpath:/mybatis/mapper/UserMapper.xml

3、测试数据库是否连接成功！

4、创建实体类，导入 Lombok！

@Data
@AllArgsConstructor
@NoArgsConstructor
public class User {
    private int id;
    private String name;
    private String pwd;
}

5、创建mapper目录以及对应的 Mapper 接口

//@Mapper : 表示本类是一个 MyBatis 的 Mapper
@Mapper
@Repository
public interface UserMapper {
    List<User> queryUserList();
    User queryUserById(int id);
    int addUser(User user);
    int updateUser(User user);
    int deleteUser(int id);
}

6、对应的Mapper映射文件

<?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.saxon.mapper.UserMapper">
    <select id="queryUserList" resultType="User">
        select * from user;
    </select>
    <select id="queryUserById" resultType="User" parameterType="int">
        select * from user where id = #{id};
    </select>
    <insert id="addUser" parameterType="User">
        insert into user(id,name,pwd) values(#{id},#{name},#{pwd});
    </insert>
    <update id="updateUser" parameterType="User">
        update user set name=#{name},pwd=#{pwd} where id=#{id};
    </update>
    <delete id="deleteUser" parameterType="int">
        delete from user where id = #{id};
    </delete>
</mapper>

7、maven配置资源过滤问题

<resources>
    <resource>
        <directory>src/main/java</directory>
        <includes>
            <include>**/*.xml</include>
        </includes>
        <filtering>true</filtering>
    </resource>
</resources>

或者 在yaml中配置

mybatis:  
    type-aliases-package: com.saxon.pojo  
    mapper-locations: classpath:/mybatis/mapper/*.xml

8、编写Controller 进行测试！

package com.saxon.demo.controller;

import com.saxon.demo.mapper.UserMapper;
import com.saxon.demo.pojo.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

@RestController
public class UserController {
    @Autowired
    private UserMapper userMapper;
    @GetMapping("/queryUserList")
    public List<User>  queryUserList(){
        List<User> users = userMapper.queryUserList();
        for (User user : users) {
            System.out.println(user);
        }
        return users;
    }
    @GetMapping("/addUser")
    public String  addUser(){
        userMapper.addUser(new User(6,"bcz","123456"));
        return "ok";
    }
    @GetMapping("/updateUser")
    public String  udpateUser(){
        userMapper.updateUser(new User(6,"abc","111111"));
        return "ok";
    }
    @GetMapping("/deleteUser")
    public String  deleteUser(){
        userMapper.deleteUser(5);
        return "ok";
    }
}

启动项目访问进行测试！