[开发测试]Junit 单元测试 mybatis

第一步

在test目录下的resource文件夹下面创建mybatis配置文件，文件内容如下图

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <settings>
        <setting name="cacheEnabled" value="true"/>
    </settings>

    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql://localhost:3306/test?useSSL=false"/>
                <property name="username" value="root"/>
                <property name="password" value="root"/>
            </dataSource>
        </environment>
    </environments>

    <databaseIdProvider type="DB_VENDOR">
        <property name="MySQL" value="mysql" />
    </databaseIdProvider>

    <mappers>

        <mapper resource="com/dao/mapper/user/ExUserMapper.xml"/>
        <mapper resource="com/dao/mapper/test/UserMapper.xml"/>

    </mappers>

</configuration>

第二步

在配置文件中增加需要测试的 xxxMapper.xml

?

第三步

编写单元测试类

1、读取配置文件

public class BaseMapperFactory {

    public static SqlSession getSession(){
        Reader reader = null;
        try {
            reader = Resources.getResourceAsReader("mybatis-config.xml");
        } catch (IOException e) {
            e.printStackTrace();
        }
        SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader);
        return sqlSessionFactory.openSession();
    }

}

2、获取SqlSession及事务

public class BaseMapperTest {

    public SqlSession sqlSession;

    @Before
    public void setUp(){
        sqlSession = BaseMapperFactory.getSession();
    }

    // 提交事务
    public void commit(){
        sqlSession.commit();
    }


    // 回滚事务
    public void rollBack(){
        sqlSession.rollback();
    }

}

3、进行方法测试

public class ExUserMapperTest extends BaseMapperTest {

    @Test
    public void batchInsert() {
        User user = new User();
        user.setEmail("1");
        ExUserMapper mapper = sqlSession.getMapper(ExUserMapper.class);
        int i = mapper.batchInsert(Lists.newArrayList(user));
        assert  i > 0;
    }
}

测试代码结构如下

UserMapper.xml

<?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="soul.dao.org.user.support.UserMapper">
  <resultMap id="BaseResultMap" type="soul.dao.org.user.User">
    <!--
      WARNING - @mbggenerated
      This element is automatically generated by MyBatis Generator, do not modify.
    -->
    <id column="id" jdbcType="INTEGER" property="id" />
    <result column="user_name" jdbcType="VARCHAR" property="userName" />
  </resultMap>
  <!-- 省略方法 -->
</mapper>

ExUserMapper.xml

<?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="soul.dao.org.user.support.ExUserMapper">
</mapper>

UserMapper.java

public interface UserMapper {

    int countByExample(UserExample example);
   
}

ExUserMapper.java

public interface ExUserMapper extends UserMapper{

    int batchInsert(List<User> newlyIncreasedUsers);

}

需要注意的点

Ex扩展类在测试的时候，如果不需要父类的ResultMap字段映射（不需要对象返回的），可以不配置，如果需要ResultMap字段映射，则需要把Ex扩展类和父类都写在配置文件中（为了能找到Ex扩展类使用的字段映射关系，如不配置：会提示找不到 resultMap），Ex扩展类如有自己的ResultMap，也可不配置父Mapper.xml