详解SpringBoot 快速整合MyBatis（去XML化）

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <!--继承信息 -->
  <parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.0.0.M4</version>
    <relativePath/>
  </parent>

  <!--依赖管理 -->
  <dependencies>
    <dependency> <!--添加Web依赖 -->
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency> <!--添加Mybatis依赖 -->
      <groupId>org.mybatis.spring.boot</groupId>
      <artifactId>mybatis-spring-boot-starter</artifactId>
      <version>1.3.1</version>
    </dependency>
    <dependency><!--添加MySQL驱动依赖 -->
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <scope>runtime</scope>
    </dependency>
    <dependency><!--添加Test依赖 -->
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-test</artifactId>
      <scope>test</scope>
    </dependency>
  </dependencies>
</project>

spring:
 datasource:
  url: jdbc:mysql://localhost:3306/socks?useSSL=false
  username: root
  password: root
  driver-class-name: com.mysql.jdbc.Driver

mybatis:
 configuration:
  map-underscore-to-camel-case: true #开启驼峰映射

// POJO类如下：
public class User {
  private String userId;
  private String username;
  private String password;
  // Getters & Setters ..
}
// 数据层代码如下：
public interface UserMapper {

  @Select("select * from t_user where 1=1")
  List<User> list();

  @Select("select * from t_user where username like #{username}")
  List<User> findByUsername(String username);

  @Select("select * from t_user where user_id like #{userId}")
  User getOne(String userId);

  @Delete("delete from t_user where user_id like #{userId}")
  int delete(String userId);
}

DROP DATABASE IF EXISTS `socks`;
CREATE DATABASE `socks`;
USE `SOCKS`;
DROP TABLE IF EXISTS `t_user`;
CREATE TABLE `t_user` (
 `USER_ID` varchar(50) ,
 `USERNAME` varchar(50) ,
 `PASSWORD` varchar(50) 
) ;

INSERT INTO `t_user` VALUES ('1', 'admin', 'admin');
INSERT INTO `t_user` VALUES ('2', 'yizhiwazi', '123456');

@SpringBootApplication
@MapperScan("com.hehe.mapper") //扫描Mapper接口
public class MybatisApplication {

  public static void main(String[] args) {
    SpringApplication.run(MybatisApplication.class, args);
  }
}

import static org.assertj.core.api.Assertions.assertThat;

@RunWith(SpringRunner.class)
@SpringBootTest
public class MybatisApplicationTest {

  @SuppressWarnings("all")
  @Autowired
  UserMapper userMapper;

  @Test
  public void test_db() {
    //开始进行测试
    assertThat(userMapper.list().size()).isGreaterThan(1);
    assertThat(userMapper.getOne("1")).isNotEqualTo(null);
    assertThat(userMapper.getOne("xxx")).isEqualTo(null);
  }
}