SpringBoot2.0之四 简单整合MyBatis

  从最开始的SSH（Struts+Spring+Hibernate）,到后来的SMM（SpringMVC+Spring+MyBatis），到目前的S（SpringBoot）,随着框架的不断更新换代，也为咱们广大的程序猿提供了更多的方便，一块儿搭建一个从控制层到持久层的项目可能须要一两天的时间，可是采用SpringBoot的方式，咱们可能只须要10分钟就能轻松完成一个web项目的搭建，下面咱们介绍一下SpringBoot2.0整合MyBatis的方法

1、新建一个项目，引入相关依赖

<!-- 单元测试依赖 start -->
      <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
    </dependency>
    <!-- 单元测试依赖 end -->
    
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    
    <dependency>
        <groupId>org.mybatis.spring.boot</groupId>
        <artifactId>mybatis-spring-boot-starter</artifactId>
        <version>1.3.1</version>
   </dependency>
    
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
    </dependency>

2、新建一个实体类

public class User {

    private Long id;
    
    private String name;//姓名
    
    private Integer age;//年龄
    //。。。

}

3、新建一个Dao层

public interface UserDao {

    int addUser(User user);
    
    int deleteUserById(Long id);
    
    int updateUserById(User user);

    User queryUserById(Long id);
    
    List<User> queryUserList();
}

4、新建MyBatis的sql操做文件

<?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.somta.springboot.dao.UserDao" > 
<!-- Result Map-->
<resultMap id="BaseResultMap" type="com.somta.springboot.pojo.User" >
    <result column="id" property="id"/>
    <result column="name" property="name"/>
    <result column="age" property="age"/>
</resultMap>
       
<!-- th_role_user table all fields -->
<sql id="Base_Column_List" >
    id, name, age
</sql>
   
<insert id="addUser" parameterType="com.somta.springboot.pojo.User" >
    insert into t_user (id, name, age) 
    values (#{id},#{name},#{age});
</insert>

<delete id="deleteUserById" parameterType="java.lang.Long">
 delete from t_user where id=#{id}
</delete>

<update id="updateUserById" parameterType="com.somta.springboot.pojo.User" >
    update t_user set 
    <trim  suffixOverrides="," >
    <if test="id != null and id != ''">
        id=#{id},
    </if>
    <if test="name != null and name != ''">
        name=#{name},
    </if>
    <if test="age != null and age != ''">
        age=#{age},
    </if>
    </trim> where id=#{id}
</update>

<select id="queryUserById" resultMap="BaseResultMap" parameterType="java.lang.Long">
    select <include refid="Base_Column_List" /> 
    from t_user where id = #{id}
</select>

<select id="queryUserList" resultMap="BaseResultMap">
    select <include refid="Base_Column_List" /> 
    from t_user
</select>

</mapper>

5、修改相关配置文件和MyBatis配置

@SpringBootApplication
@MapperScan("com.somta.springboot.dao")
public class Application {
    public static void main(String [] args) {
        SpringApplication.run(Application.class, args);
    }
}

spring:  
  datasource:
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://127.0.0.1:3306/test?useUnicode=true&characterEncoding=utf-8&useSSL=false
    username: root
    password: 123456
    
mybatis:
  mapper-locations: classpath*:mybatis/**/Mysql_*Mapper.xml

经过@MapperScan("com.somta.springboot.dao")指定Dao层的包路径，经过mapper-locations配置了MyBatis文件的扫描路径，达到对应映射的效果

6、编写单元测试类

/**
 * 
 * @author 明天的地平线
 * 
 * SpringBoot 以前的版本配置单元测试类时使用 @SpringApplicationConfiguration(Application.class)
 * SpringBoot 1.5.9  改用@SpringBootTest(classes = Application.class)
 * 
 *
 */
@RunWith(SpringJUnit4ClassRunner.class)
@SpringBootTest(classes = Application.class)
public class MyBatisTest {

    @Autowired
    private UserDao userDao;
    
    /**
     * 新增用户
     * @throws Exception
     */
    @Test
    public void testAddUser() throws Exception {
        User user = new User();
        user.setId(889L);
        user.setName("zhangsan");
        user.setAge(12);
        userDao.addUser(user);
    }
    
    /**
     * 删除用户
     * @throws Exception
     */
    @Test
    public void testDelUser() throws Exception {
        userDao.deleteUserById(889L);
    }
    
    /**
     * 修改用户信息
     * @throws Exception
     */
    @Test
    public void testUpdUser() throws Exception {
        User user = new User();
        user.setId(2L);
        user.setName("zhangsan99");
        user.setAge(122);
        userDao.updateUserById(user);
    }
    
    /**
     * 查询用户
     * @throws Exception
     */
    @Test
    public void testQueryUser() throws Exception {
        User user = userDao.queryUserById(2L);
        System.out.println(user.getName());
    }
    
    /**
     * 查询全部用户
     * @throws Exception
     */
    @Test
    public void testQueryUserList() throws Exception {
        List<User> list = userDao.queryUserList();
        for (User user : list) {
            System.out.println(user.getName());
        }
    }
    
}

Git代码地址：https://gitee.com/Somta/Sprin...
原文地址：http://somta.com.cn/#/blog/vi...

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