依赖配置pom.xml

<!--父工程-->
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.10.RELEASE</version>
    </parent>

    <dependencies>
        <!--web工程所需依赖包-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <!--mybatis集成依赖-->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.2.2</version>
        </dependency>

        <!--MySQL-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
    </dependencies>

配置数据源
在application.properties中加入如下配置

spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/pinyougoudb
spring.datasource.username=root
spring.datasource.password=123456
mybatis.mapper-locations=classpath:com/itheima/mapper/*Mapper.xml
mybatis.type-aliases-package=com.itheima.domain

创建UserMapper.java接口
接口上需要加上@Mapper注解，标注该接口属于MyBatis接口。

@Mapper
public interface UserMapper {
    List<User> list();
}

创建UserMapper.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.itheima.mapper.UserMapper" >
    <!--查询所有-->
    <select id="list" resultType="User">
        select * from tuser
    </select>
</mapper>

引导类加上包扫描
引导类上需要加上@MapperScan(basePackages = “com.itheima.mapper”)

@SpringBootApplication
@MapperScan(basePackages = "com.itheima.mapper")
public class Application {
    public static void main(String[] args) {
        SpringApplication.run(Application.class,args);
    }
}