maven依赖
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<!-- mybatis -->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.1.0</version>
</dependency>
知识兔
设置配置文件、Mapper的路径
# mapper
mybatis.mapper-locations=classpath:/mybatis/mapper/*.xml
mybatis.config-location=classpath:/mybatis/config/mybatis-config.xml
知识兔
public interface UserMapper {
List<User> findAll();
}
知识兔
@SpringBootApplication
@MapperScan("com.getword.dao")
知识兔
<?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"><!-- namespace指用户自定义的命名空间。和接口路径一致 --><mapper namespace="com.getword.dao.UserMapper"> <!-- select操作 resultType="map"表示返回的是一个Map对象 使用列名做key,值做value --> <select id="findAll" resultType="map"> SELECT * FROM tb_user where id=1 </select></mapper>