查詢老師對應的所有導師的信息

在09的基礎上修改dao和mapper文件

public interface TeacherDao {
    /**
     * 根據老師的編號查詢所有的導師信息
     */
    Teacher selectTeahcerById(Integer tId);
}

<?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="cn.bdqn.dao.TeacherDao">

    <resultMap type="Teacher" id="teacherMap">
      <id property="id" column="id"/>
      <result property="name" column="name"/>
      <!-- 設置關聯集合的屬性   遞歸查詢 把查詢到的tid當作id再次查詢上級的導師信息 -->
      <association property
 
="teacher" javaType="Teacher"
       select="selectTeahcerById" column="tid"/>
    </resultMap>
 
     <select id="selectTeahcerById" resultMap="teacherMap">
      select  id,name,tid from  teacher where id=#{xxx}
    </select>
    
</mapper>

測試類代碼

 /**
     * 根據老師的編號查詢所有的導師信息
     
 
*/
    @Test
    public void test1() {
        Teacher teacher = dao.selectTeahcerById(8);
        System.out.println(teacher);
    }

mybatis10--自連接多對一查詢