one2one
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多表连接
<mapper namespace="com.abc.dao.IHusbandDao">
<!-- 多表连接查询 -->
<!-- 定义结果映射关系 -->
<resultMap type="Husband" id="husbandMap">
<id column="hid" property="hid" />
<result column="hname" property="hname" />
<association property="wife" javaType="Wife">
<id column="wid" property="wid" />
<result column="wname" property="wname" />
</association>
</resultMap>
<select id="selectHusbandById" resultMap="husbandMap">
select hid,hname,wid,wname
from husband,wife
where wid=wifeId and hid=#{xxx}
</select>
</mapper>
多表单独
<mapper namespace="com.abc.dao.IHusbandDao">
<!-- 多表单独查询 -->
<select id="selectWifeByHusband" resultType="Wife">
select wid,wname from wife where wid=#{jjj}
</select>
<!-- 定义结果映射关系 -->
<resultMap type="Husband" id="husbandMap">
<id column="hid" property="hid" />
<result column="hname" property="hname" />
<association property="wife"
javaType="Wife"
select="selectWifeByHusband"
column="wifeId"/>
</resultMap>
<select id="selectHusbandById" resultMap="husbandMap">
select hid,hname,wifeId from husband where hid=#{xxx}
</select>
</mapper>
多表连接2
<!-- 多表连接查询 -->
<!-- 定义结果映射关系 -->
<resultMap type="Husband" id="husbandMap">
<id column="hid" property="hid" />
<result column="hname" property="hname" />
<association property="wife" javaType="Wife">
<id column="wid" property="wid" />
<result column="wname" property="wname" />
</association>
</resultMap>
<select id="selectHusbandById" resultMap="husbandMap">
select hid,hname,wid,wname
from husband,wife
where wid=hid and hid=#{xxx}
</select>
多表单独2
<mapper namespace="com.abc.dao.IHusbandDao">
<!-- 多表单独查询 -->
<select id="selectWifeByHusband" resultType="Wife">
select wid,wname from wife where wid=#{jjj}
</select>
<!-- 定义结果映射关系 -->
<resultMap type="Husband" id="husbandMap">
<id column="hid" property="hid" />
<result column="hname" property="hname" />
<association property="wife"
javaType="Wife"
select="selectWifeByHusband"
column="hid"/>
</resultMap>
<select id="selectHusbandById" resultMap="husbandMap">
select hid,hname from husband where hid=#{xxx}
</select>
</mapper>
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