MySQL实现统计数据并插入数据的存储过程

统计存储过程，这里是将统计的结果插入一个表中，后台可以有定时任务来调此存储过程。以下业务是统计仓库中商品流转情况，包括：日期、商品总数、入库数量、出库数量。

BEGIN
  DECLARE ES_COR_CODE VARCHAR(20);
 -- 需要定义接收游标数据的变量 
  DECLARE table_ VARCHAR(50);
  -- 遍历数据结束标志
  DECLARE done INT DEFAULT FALSE;
  -- 游标
  DECLARE cur CURSOR FOR SELECT TABLE_NAME FROM (SELECT TABLE_NAME from information_schema.tables WHERE TABLE_NAME LIKE '%wm_item_transfer_%' AND TABLE_SCHEMA='wmscloud_test' ) allTables;
  -- 将结束标志绑定到游标
  DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;
  -- 打开游标
  OPEN cur;
   -- 开始循环
  read_loop: LOOP

  -- 提取游标里的数据，这里只有一个，多个的话也一样；
  FETCH cur INTO table_;
  -- 声明结束的时候
  IF done THEN

    LEAVE read_loop;

  END IF;

  SET ES_COR_CODE=substring(table_,18);

  
SET @INSERT_ITEM_TRANSFER=CONCAT('INSERT INTO wm_item_transfer_',ES_COR_CODE,' (WMIT_DATE,WMIT_STOCK_NUM,WMIT_INTO_ITEM_NUM,WMIT_OUT_ITEM_NUM) 

 SELECT 

(SELECT date_sub(curdate(),interval 1 day) ) WMIT_DATE ,

(SELECT IFNULL(SUM(WMST_NOW_NUMBER),0) FROM wm_stock_',ES_COR_CODE,') WMIT_STOCK_NUM,

(SELECT IFNULL(SUM(WMST_NOW_NUMBER),0) FROM wm_stock_',ES_COR_CODE,' WHERE   WMST_RECEIVE_DATE BETWEEN date_sub(curdate(),interval 1 day) AND NOW() ) WMIT_INTO_ITEM_NUM,

(SELECT IFNULL(SUM(WMOO_OUT_NUMBER),0)  FROM wm_out_order_',ES_COR_CODE,' where SURE_DATE BETWEEN date_sub(curdate(),interval 1 day) AND NOW() ) WMIT_OUT_ITEM_NUM');

PREPARE INSERT_ITEM_TRANSFER FROM @INSERT_ITEM_TRANSFER;

EXECUTE INSERT_ITEM_TRANSFER;

  END LOOP;
  -- 关闭游标
  CLOSE cur;


END