【求助】ibatis映射得到只有最后一条记录

[x_flyer]

在进行联合查询的时候得到只有一条记录，而实际结果应该是多条记录的；
当我值查询一张表的字段时得到的结果就是多条的，这是为什么呢？我的映射写错了？还是SQL有问题？
部分代码如下：

public class AssessTeach{
	private Long id;
    
	private String staffid;

	private String content;

	//其他属性以及getter() and setter()方法就不写了
}

public class AssessTeachComp{
	private String year = "";
	
	private AssessTeach entity = null;

	//其他属性以及getter() and setter()方法就不写了

}

相关配置文件如下：

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//ibatis.apache.org//DTD Mapper 3.0//EN"
"http://ibatis.apache.org/dtd/ibatis-3-mapper.dtd">


<!-- 不使用namespace的话sql搜索定位会比较方便 -->
<mapper namespace="AssessTeach">
	
	<resultMap id="RM.AssessTeachComp" type="com.zf.hrm.assess.model.AssessTeachComp">
		<result property="year" column="YEAR"/>
		<result property="editable" column="EDITABLE" />
		<association property="entity" javaType="com.zf.hrm.assess.model.AssessTeach"
			resultMap="RM.AssessTeach"></association>
	</resultMap>
	
	<resultMap id="RM.AssessTeach" type="com.zf.hrm.assess.model.AssessTeach">
		<id property="id" column="ID"/>
		<result property="staffid" column="STAFFID"/>
		<result property="starttime" column="STARTTIME"/>
		<result property="endtime" column="ENDTIME"/>
		<result property="curriculum" column="CURRICULUM"/>
		<result property="content" column="CONTENT"/>
		<result property="kind" column="KIND"/>
		<result property="student" column="STUDENT"/>
		<result property="studentcount" column="STUDENTCOUNT"/>
		<result property="sumhour" column="SUMHOUR"/>
		<result property="assess" column="ASSESS"/>
		<result property="remark" column="REMARK"/>
	</resultMap>

	<sql id="AssessTeach.compColumns">
		 <!-- 此处定义字段时删除 YEAR和EDITABLE就能够查询到多条 -->
		 <![CDATA[
		 	YEAR, EDITABLE,
		 	B.ID, B.STAFFID, B.STARTTIME, B.ENDTIME, B.CURRICULUM, B.CONTENT,
		 	B.KIND, B.STUDENT, B.STUDENTCOUNT, B.SUMHOUR, B.ASSESS, B.REMARK
		 ]]>
	</sql>

	<select id="AssessTeach.list" resultMap="RM.AssessTeachComp">
		SELECT <include refid="AssessTeach.compColumns" />
		<![CDATA[
			FROM ASSESS_TEACH_COMP,  ASSESS_TEACH B
			WHERE TEACH_ID =  B.ID
				AND YEAR = #{year}
				AND B.STAFFID = #{entity.staffid}
		]]>
	</select>
</mapper>

[x_flyer]

这么没人帮忙啊