<!--根据poi_info表的id和city_id更新flag_hinterland_flows的poi_id和city_id--> <select id="selectPoiAndCityId" parameterType="java.lang.Long" resultType="com.wormpex.gs.stat.service.dao.entity.baseinfo.PoiAndCityId"> select n.id as poiId,n.city_id as cityId,n.code as code from poi_info n inner join flag_hinterland_flows m /*1用inner join,只返回满足匹配条件的数据,减少数据库io次数*/ on m.flag_code=n.code <where> <if test="id != null"> n.id<![CDATA[<=]]>#{id,jdbcType=BIGINT} </if> </where> </select> <update id="updatePoiAndCityId" parameterType="com.wormpex.gs.stat.service.dao.entity.baseinfo.PoiAndCityId" > update flag_hinterland_flows <set> poi_id=#{poiId,jdbcType=BIGINT}, <if test="cityId != null"> city_id=#{cityId,jdbcType=BIGINT}, </if> </set> /*2set标签可以自动忽略if标签中多余的逗号,但是,对于if标签里面再嵌套一层if的时候,set标签就不能自动忽略了*/ where /*3where放到set标签外边*/ flag_code=#{code,jdbcType=VARCHAR} </update>
时间: 2024-10-29 02:16:59