优化查询

signal-optimize-service/src/main/resources/mapper/StrategyGreenOptHistMapper.xml

@@ -5,7 +5,11 @@
 <mapper namespace="net.wanji.opt.dao.mapper.StrategyGreenOptHistMapper">
 
     <select id="selectByGreenId" resultType="net.wanji.opt.po.StrategyGreenOptHistEntity" parameterType="String" >
-        select * from t_strategy_green_opt_hist where `green_id` = #{greenId} and `control_method`=1 and TIMESTAMPDIFF(SECOND,`control_time`, now()) &lt; `control_duration` order by create_time desc limit 2;
+      select * from t_strategy_green_opt_hist a
+      inner join (
+        -- 先查询出最后一条数据的时间
+        select `green_id`, MAX(`control_time`) control_time from t_strategy_green_opt_hist group by `green_id`
+      ) b on a.`green_id` = b.`green_id` and a.`control_time` = b.`control_time`  and a.`green_id` = #{greenId} and a.`control_method` = 1 and TIMESTAMPDIFF(SECOND,a.`control_time`, now()) &lt; a.`control_duration`
     </select>
 
 </mapper>
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