SpringBoot整合Mybatis

1、添加依赖

<dependency>
    <groupId>org.mybatis.spring.boot</groupId>
    <artifactId>mybatis-spring-boot-starter</artifactId>
    <version>2.1.1</version>
</dependency>

2、创建实体类

//使用了lombok，依赖自己添加
@Data
@AllArgsConstructor
@NoArgsConstructor
public class User {

    private Integer id;
    private String name;
    private String passwd;
}

3、创建mapper

@Mapper //在接口类上添加了@Mapper，在编译之后会生成相应的接口实现类
@Repository 
public interface UserMapper {

    //查询所有的用户信息
    List<User> queryUserList();

    //根据用户id查询用户
    User queryUserById(int id);

}

4、MyBatis相关配置

mybatis:
  type-aliases-package: com.comple.mybatis.bean # 注意：对应实体类的路径
  mapper-locations: classpath:mapper/*.xml #注意：一定要对应mapper映射xml文件的所在路径

5、编写接口对应的xml文件

<!--接口对应的xml文件放在resources目录下-->
<?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.comple.mybatis.mapper.UserMapper">
   <select id="queryUserList" resultType="com.comple.mybatis.bean.User">
       select * from user
   </select>

    <select id="queryUserById" resultType="com.comple.mybatis.bean.User">
        select * from user where id = #{id}
    </select>
    
</mapper>