Mysql存储过程中的动态视图不更新
我有一个包含100000多条记录的表,根据存储在特定列中的值,我可以从中进行一些计算 为此,我编写了一个存储过程,每次从基表中获取100行。因为游标不支持动态sql。我所做的是创建一个动态视图,光标总是从该视图中选择数据 守则:Mysql存储过程中的动态视图不更新,mysql,sql,dynamic,view,procedure,Mysql,Sql,Dynamic,View,Procedure,我有一个包含100000多条记录的表,根据存储在特定列中的值,我可以从中进行一些计算 为此,我编写了一个存储过程,每次从基表中获取100行。因为游标不支持动态sql。我所做的是创建一个动态视图,光标总是从该视图中选择数据 守则: BEGIN -- VARIABLES TO RETURN DECLARE ORIG_COUNT INT ; DECLARE SERVED_COUNT INT; -- VARIABLED FOR LOOPING DECLARE no_more_rows BOOLEAN;
BEGIN
-- VARIABLES TO RETURN
DECLARE ORIG_COUNT INT ;
DECLARE SERVED_COUNT INT;
-- VARIABLED FOR LOOPING
DECLARE no_more_rows BOOLEAN;
DECLARE no_more_rows_sub BOOLEAN;
DECLARE num_rows INT DEFAULT 0;
SET @ORIG_COUNT =0;
SET @SERVED_COUNT=0;
SELECT COUNT(*) FROM table_one AS A WHERE A.year='2011' INTO @ORIG_COUNT ;
DELETE FROM table_test;
insert into table_test values ('Total Rows',@ORIG_COUNT,NULL);
DROP TABLE IF EXISTS table_request;
CREATE TABLE table_request (
BN_NUM VARCHAR(25) NOT NULL,
DN_NUM varchar(10) NOT NULL,
A_TOTAL FLOAT DEFAULT 0,
B_TOTAL FLOAT DEFAULT 0,
C_TOTAL FLOAT DEFAULT 0,
PRIMARY KEY (BN)
);
WHILE (@SERVED_COUNT<@ORIG_COUNT) DO
DROP VIEW IF EXISTS pbs_history.temp_view;
SET @query = CONCAT('CREATE VIEW temp_view as SELECT A.BN,A.DN
FROM table_one AS A
WHERE A.year='2011'
ORDER BY A.ID
LIMIT ', @SERVED_COUNT,',100');
PREPARE stmt from @query;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;
/* ================= HERE ==================== */
SELECT * FROM temp_view;
BLOKA:BEGIN
DECLARE BN VARCHAR(25);
DECLARE DN VARCHAR(10);
DECLARE num_rows INT(5) DEFAULT 0;
DECLARE bn_count INT(5) DEFAULT 0;
DECLARE sel_recs CURSOR FOR SELECT * FROM temp_view;
DECLARE CONTINUE HANDLER FOR NOT FOUND SET no_more_rows = TRUE;
insert into table_test values('Start Served',@SERVED_COUNT,@query);
OPEN sel_recs;
SELECT FOUND_ROWS() INTO @num_rows;
insert into table_test values('Found Rows in View',@num_rows,NULL);
the_loop: LOOP
FETCH sel_recs INTO BN,DN;
IF no_more_rows THEN
CLOSE sel_recs;
LEAVE the_loop;
END IF;
SET @bn_count=0;
SELECT COUNT(*) FROM table_request WHERE BILL_NUMBER=BN INTO @bn_count;
insert into table_test VALUES(BN,DN,@bn_count);
IF(@bn_count=0) THEN
INSERT INTO table_request VALUES (BN,DN,0,0,0);
END IF;
BLOKB:BEGIN
DECLARE CAT VARCHAR(5);
DECLARE T1 FLOAT;
DECLARE data_fetch CURSOR FOR SELECT CAT_ID, TYPE_1 FROM transactions WHERE ID=BN;
DECLARE CONTINUE HANDLER FOR NOT FOUND SET no_more_rows_sub = TRUE;
OPEN data_fetch;
sub_loop: LOOP
FETCH data_fetch INTO CAT,T1;
IF no_more_rows_sub THEN
CLOSE data_fetch;
LEAVE sub_loop;
END IF;
IF (CAT='P1') THEN
UPDATE table_request SET A_TOTAL = A_TOTAL+T1 WHERE BN_NUM=BN;
ELSEIF (CAT='P2') THEN
UPDATE table_request SET B_TOTAL = B_TOTAL+T1 WHERE BN_NUM=BN;
ELSEIF (CAT='P3') THEN
UPDATE table_request SET N_TOTAL = N_TOTAL+T1 WHERE BN_NUM=BN;
END IF;
END LOOP sub_loop;
END BLOKB;
SET @SERVED_COUNT = @SERVED_COUNT+1;
END LOOP the_loop;
insert into table_test values ('End the_loop',0,NULL);
END BLOKA;
END WHILE;
END
我正在使用原始表中的一个子集测试代码。该子集有461条记录
这段代码应该有5次迭代。在最后的迭代中,视图应该只包含61条记录。但是使用这段代码,每个迭代有100条记录,并且在每个迭代中,它只考虑前100条记录
但如果在程序运行后在mysql控制台中从temp_视图运行SELECT*,它将显示最后61条记录
任何人都可以指出我在这里做错了什么?打印@SERVED\u COUNT的值,并查看是否正确更新。是的,确实如此。创建sql的视图是正确的。创建视图temp_VIEW as从表_one中选择A.BN,A.DN作为A.year='2011'订单的A.ID LIMIT 0100;创建视图temp_VIEW as从表_one中选择A.BN,A.DN作为A.year='2011'订单的A.ID LIMIT 100100;结果似乎是,该过程将计算应用于它多次获取的第一个数据集,而忽略更新的视图。