Question

我试图从DB2系统中的游标中的多个表中删除。但是终结符;导致我的光标过早退出。目前，我无法确定另一种设置此查询以实现所需结果的方法。

我尝试了以下声明：

DECLARE C1 CURSOR FOR
DELETE FROM TABLE1 WHERE ACCOUNT_NUMBER = ACCOUNT_NUMBER_PARAM;
DELETE FROM TABLE2 WHERE ACCOUNT_NUMBER = ACCOUNT_NUMBER_PARAM;
DELETE FROM TABLE3 WHERE ACCOUNT_NUMBER = ACCOUNT_NUMBER_PARAM;
DELETE FROM TABLE4 WHERE ACCOUNT_NUMBER = ACCOUNT_NUMBER_PARAM;
DELETE FROM TABLE5 WHERE ACCOUNT_NUMBER = ACCOUNT_NUMBER_PARAM;
DELETE FROM TABLE6 WHERE ACCOUNT_NUMBER = ACCOUNT_NUMBER_PARAM;
DELETE FROM TABLE7 WHERE ACCOUNT_NUMBER = ACCOUNT_NUMBER_PARAM;

然而，这并没有按预期运行，这意味着它不会循环游标，而是只运行一次。

这也无法运行：

--#SET TERMINATOR @
DECLARE C1 CURSOR FOR
SELECT * FROM TABLE1 WHERE ACCOUNT_NUMBER = ACCOUNT_NUMBER_PARAM@
SELECT * FROM TABLE2 WHERE ACCOUNT_NUMBER = ACCOUNT_NUMBER_PARAM@
SELECT * FROM TABLE3 WHERE ACCOUNT_NUMBER = ACCOUNT_NUMBER_PARAM@
SELECT * FROM TABLE4 WHERE ACCOUNT_NUMBER = ACCOUNT_NUMBER_PARAM@
SELECT * FROM TABLE5 WHERE ACCOUNT_NUMBER = ACCOUNT_NUMBER_PARAM@
SELECT * FROM TABLE6 WHERE ACCOUNT_NUMBER = ACCOUNT_NUMBER_PARAM@
SELECT * FROM TABLE7 WHERE ACCOUNT_NUMBER = ACCOUNT_NUMBER_PARAM@;
OPEN C1@

在这里，我尝试更改游标终止符，以便它进一步向下并实际打开并运行游标，但是这会引发错误并且根本没有运行。

如何重写此语句以在游标中运行多个select语句？

Answer 1

在OPEN C1之后，您需要循环存储在光标中的结果。

使用

OPEN C1
FETCH NEXT FROM C1 INTO @Variable1,@Variable2,....( as many as fields in the table )
WHILE @@FETCH_STATUS = 0
BEGIN

FETCH NEXT FROM C1 INTO @Variable1,@Variable2,....( as many as fields in the table )
END

CLOSE CURSOR
DEALLOCATE CURSOS

Answer 2

为什么需要游标来删除数据？

这样做要好得多：

DELETE FROM table1 WHERE colname = (SELECT colname FROM table1 WHERE condition);
DELETE FROM table2 WHERE colname = (SELECT colname FROM table2 WHERE condition);
DELETE FROM table3 WHERE colname = (SELECT colname FROM table3 WHERE condition);
DELETE FROM table4 WHERE colname = (SELECT colname FROM table4 WHERE condition);

在存储过程中运行它应该没有问题。

游标DB2中的多个删除语句

2 个答案: