我们有很多表,其中包含3个列(RID
,PARTNER
,SUPPLIER
). 我想更新这些cols,但只有在4个表 - 取决于PK。
所以我开始了一些事情,但我卡住了。
BEGIN
FOR i IN
(select table_name from all_tab_columns where column_name = 'RID' /*PK*/
and column_name = 'PARTNER' or column_name = 'SUPPLIER')
LOOP
EXECUTE IMMEDIATE 'UPDATE ' || i.table_name|| 'set PARTNER = :newvalue where PARTNER = :oldavalue and RID = :ridvalue'
USING (newvalue, oldvalue, ridvalue)
END LOOP
END
问题:
Partner
或 Supplier
例如:在一个表格中,它是否 Partner
,在前面的表格中是 Supplier
)Partner
或 Supplier
)但只在1个表中,取决于PK你需要使用条件 USING
子句,以及一点点不同的查询在 FOR
循环如下:
BEGIN
FOR I IN (
SELECT TABLE_NAME
, PARTNER_COUNT
, SUPPLIER_COUNT
FROM (
SELECT TABLE_NAME
, SUM(CASE WHEN COLUMN_NAME = 'RID' THEN 1 ELSE 0 END) AS RID_COUNT
, SUM(CASE WHEN COLUMN_NAME = 'PARTNER' THEN 1 ELSE 0 END) AS PARTNER_COUNT
, SUM(CASE WHEN COLUMN_NAME = 'SUPPLIER' THEN 1 ELSE 0 END) AS SUPPLIER_COUNT
FROM ALL_TAB_COLUMNS
WHERE COLUMN_NAME = 'RID'
OR COLUMN_NAME = 'PARTNER'
OR COLUMN_NAME = 'SUPPLIER'
) WHERE RID_COUNT = 1 AND PARTNER_COUNT + SUPPLIER_COUNT = 1
) LOOP
EXECUTE IMMEDIATE 'UPDATE '
|| I.TABLE_NAME
|| 'set :col_name = :newvalue where :col_name = :oldavalue and RID = :ridvalue'
USING ( DECODE(PARTNER_COUNT,1,'PARTNER','SUPPLIER'),
NEWVALUE,
DECODE(PARTNER_COUNT,1,'PARTNER','SUPPLIER'),
OLDVALUE,
RIDVALUE );
END LOOP;
END;
/