<mapper namespace="com.lcb.mapping.userMapper"> <!--association 一對(duì)一關(guān)聯(lián)查詢(xún) --> <select id="getClass" parameterType="int" resultMap="ClassesResultMap"> select * from class c,teacher t where c.teacher_id=t.t_id and c.c_id=#{id} </select> <resultMap type="com.lcb.user.Classes" id="ClassesResultMap"> <!-- 實(shí)體類(lèi)的字段名和數(shù)據(jù)表的字段名映射 --> <id property="id" column="c_id"/> <result property="name" column="c_name"/> <association property="teacher" javaType="com.lcb.user.Teacher"> <id property="id" column="t_id"/> <result property="name" column="t_name"/> </association> </resultMap> <!--collection 一對(duì)多關(guān)聯(lián)查詢(xún) --> <select id="getClass2" parameterType="int" resultMap="ClassesResultMap2"> select * from class c,teacher t,student s where c.teacher_id=t.t_id and c.c_id=s.class_id and c.c_id=#{id} </select> <resultMap type="com.lcb.user.Classes" id="ClassesResultMap2"> <id property="id" column="c_id"/> <result property="name" column="c_name"/> <association property="teacher" javaType="com.lcb.user.Teacher"> <id property="id" column="t_id"/> <result property="name" column="t_name"/> </association> <collection property="student" ofType="com.lcb.user.Student"> <id property="id" column="s_id"/> <result property="name" column="s_name"/> </collection> </resultMap> </mapper>

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