[英]Perl DBI with mysql: how to get return value from a stored procedure?
[英]How to get a loop value in MySQL stored procedure?
FOR I = 1 TO 10
tRESNUM = ALLTRIM(STR(I))
tRESCAS = 'tRESCAS'+tRESNUM
&tRESCAS = 0.00
ENDFOR
我正在将此Fox-pro代码转换为MySQL存储过程。
在Foxpro中,tRESCAS ='tRESCAS'+ tRESNUM给出tRESCAS1,tRESCAS2 ...和&tRESCAS给出的值是tRESCAS1或tRESCAS1或其他。
例如
if I =1 =>
FOR I = 1 TO 10
tRESNUM = ALLTRIM(STR(1))
tRESCAS = 'tRESCAS'+1
tRESCAS1 = 0.00
ENDFOR
If I =2 =>
FOR I = 1 TO 10
tRESNUM = ALLTRIM(STR(2))
tRESCAS = 'tRESCAS'+2
tRESCAS2 = 0.00
ENDFOR
&tRESCAS像这样自动获取tRESCAS值tRESCAS1或tRESCAS2。
在存储过程中,如何获得这种类型的价值? (存储过程中是否有任何特殊变量,例如&this?)
这足够详细吗?
看看这个程序-
PROCEDURE procedure1()
BEGIN
DECLARE tRESCAS VARCHAR(255) DEFAULT '';
DECLARE i INT DEFAULT 0;
DROP TEMPORARY TABLE IF EXISTS t;
CREATE TEMPORARY TABLE t(num INT, column1 VARCHAR(255));
WHILE i < 10 DO
INSERT INTO t VALUES(i, CONCAT('tRESCAS', i));
SET i = i + 1;
END WHILE;
-- Try to get fifth value
SELECT column1 FROM t WHERE num = 5;
END
所有值都存储在临时表中。
执行以下步骤:
CALL procedure1;
+----------+
| column1 |
+----------+
| tRESCAS5 |
+----------+
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