在sqlMapConfig中进行设置
<configuration>
<settings>
<!--延迟加载的总开关-->
<setting name="lazyLoadingEnabled" value="true"/>
<!--设置为false才是启动延迟加载-->
<setting name="aggresiveLazyLoading" value="false"/>
</settings>
......
</configuration>
在mapper.xml中使用两次查询的方式；
<!-- 2.查询两次select * from class where c_id = 1 ; SELECT * from teacher where
t_id = 1 --> <select id="getClass2" resultMap="getClass2Map">
select * from class where c_id
=#{id}
</select>
<select id="getTeacher" parameterType="int" resultType="com.stone.bean.Teacher">
select
t_id id,t_name name
from teacher where t_id=#{id}
</select>
<select id="getStudents" parameterType="int" resultType="com.stone.bean.Student">
select
S_id id,s_name name from student where c_id=#{id}
</select>
<resultMap type="com.stone.bean.ClassT" id="getClass2Map">
<id property="id" column="c_id" />
<result property="name" column="c_name" />
<association property="teacher" column="t_id" select="getTeacher">
</association>
<collection property="list" column="c_id" select="getStudents"></collection>
</resultMap>
