问题
I have a SQL query (a store procedure ) that i want to convert to PLSQL I already conver most of the store procedure but i cant convert the following part :
DECLARE lookupTableRow CURSOR FOR
SELECT TableName FROM SYS_LookUpTable
OPEN lookupTableRow
FETCH NEXT FROM lookupTableRow INTO @tableName
WHILE @@FETCH_STATUS=0
BEGIN
SET @sql='SELECT * FROM '+@tableName
EXECUTE sp_executesql @sql
IF @counter=0
BEGIN
INSERT INTO T_TABLE_MAPPING VALUES('P_MAIN_METADATA', 'Table', @tableName)
END
ELSE
BEGIN
INSERT INTO T_TABLE_MAPPING
VALUES( 'P_MAIN_METADATA',
'Table' + CONVERT(NVARCHAR(10),@counter),
@tableName)
END
SET @counter=@counter+1
FETCH NEXT FROM lookupTableRow INTO @tableName
END
CLOSE lookupTableRow
DEALLOCATE lookupTableRow
As i understand i can't use ORACLE dynamic sql (execute immediate) when the table name is a parameter.
Furthermore when i execute this dynamic query in my SQL store procedure each SELECT statement return me as a result the relevant table rows , those result are different in each loop .
Please advice for any solution * how can i use dynamic sql with table name as parameter ? * how can i use a "dynamic" cursor, in order to be able to display the dynamic results ?
Thanks for the advice
回答1:
If the only thing you don't know how to do here is using a table name dynamically then this is how you can accomplish that
1 declare
2 n number;
3 table_name varchar2(30) := 'dual';
4 begin
5 execute immediate 'select count(*) from ' || table_name into n;
6 dbms_output.put_line(n);
7* end;
SQL> /
1
回答2:
If you're simply trying to populate a table that obfuscates table names to something else, why do it sequentially forcing the db to change contexts and slow down?
Create table t_table_mapping as
( Select 'P_MAIN_METADATA' "P_MAIN_METADATA",
'Table' || to_char(rownum) as "Table", table_name
from all_tables)
However this doesn't take into account schema names so what owner. So you need to add a where clause to limit to the specific schema you're wanting to do this for.
来源:https://stackoverflow.com/questions/20839882/oracle-using-dynamic-sql-when-table-name-is-a-parameter