Stored procedure with temp table creation inside and using it

Question

I want to create a temp table inside a stred procedure and make use of it . I want perform some delete statements based on select statemets .An I want to drop the table at the end .
When I tried to create a table inside the stored procedure using exxecute immediate statement ,.
sql_stmt := 'CREATE GLOBAL TEMPORARY TABLE pattern_str_temp as select * from pattern_structure';
     EXECUTE IMMEDIATE 'CREATE GLOBAL TEMPORARY TABLE pattern_str_temp as select * from woc_pattern_structure' ;
Then my select statements that contain this table do not identify the table name.
I got compilor error when I use it in hte stored procedure in the select statement .Then I did like this-
WHENEVER SQLERROR CONTINUE
DROP TABLE pattern_str_temp;
CREATE TABLE pattern_str_temp AS SELECT * FROM pattern_structure ;
COMMIT;
CREATE OR REPLACE PACKAGE BODY Woc_Delete_Model_Data
AS
NAME: Woc_Delete_Model_Data
PURPOSE:
REVISIONS:
Ver Date Author Description
1.0 11/01/2008 gtutika 1. Deletes given Product Model
PROCEDURE deleteCategory(p_product_model IN varchar2,
               p_request_status OUT VARCHAR2,
               p_err_mesg OUT VARCHAR2
IS
l_category VARCHAR2(200);
l_count NUMBER;
CURSOR getAttribute IS
     SELECT Category_Name
     FROM
Woc_Attribute_Category
WHERE Attribute_Name in
(SELECT Child_Name FROM pattern_structure
WHERE Child_Type = 'Attribute' and product_Model_Name = p_product_model)
FOR UPDATE;
BEGIN
     DBMS_OUTPUT.ENABLE(1000000);
     --dbms_output.put_line('START-Inside DeleteCategory Procedure .........');
     --sql_stmt := 'CREATE GLOBAL TEMPORARY TABLE pattern_str_temp as select * from pattern_structure';
     --EXECUTE IMMEDIATE 'CREATE GLOBAL TEMPORARY TABLE pattern_str_temp as select * from pattern_structure' ;
     OPEN getAttribute ;
LOOP
     FETCH getAttribute INTO l_category ;
     EXIT WHEN getAttribute%NOTFOUND;
     l_count := Is_Category_Used(p_product_model , l_category);
IF (l_count=0) THEN
     DELETE FROM WOC_ATTRIBUTE_CATEGORY where CATEGORY_NAME = l_category;
     DELETE from woc_item_category
     where CATEGORY_NAME = l_category;
     DELETE FROM WOC_CATEGORY WHERE CATEGORY_NAME = l_category;
END IF;
     END LOOP;
     --(getAttribute%ROWCOUNT);
     CLOSE getAttribute;
     --dbms_output.put_line('END-Inside DeleteCategory Procedure .........');
EXCEPTION
     WHEN OTHERS THEN
     dbms_output.put_line(SQLERRM);
          p_err_mesg := 'ERROR IN CUSOR';
          --dbms_output.put_line('ERROR in CUSOR');
          ROLLBACK;
END;
FUNCTION Is_Category_Used(p_product_model IN varchar2 , p_category IN Varchar2)
     RETURN NUMBER IS
     l_count NUMBER;
     l_attribute VARCHAR2(40);
     l_pattern varchar2(30);
     CURSOR getAttribute IS
     SELECT attribute_Name from
     WOC_ATTRIBUTE_CATEGORY WHERE category_name = p_category and Attribute_Name in
     (Select Child_Name from pattern_str_temp
     where child_type = 'Attribute' and product_Model_Name = p_product_model);
BEGIN
DBMS_OUTPUT.ENABLE(1000000);
     SELECT count(*) into l_count from
     WOC_ATTRIBUTE_CATEGORY WHERE category_name = p_category and Attribute_Name in
     (Select Child_Name from pattern_str_temp
where child_type = 'Attribute' and product_Model_Name <> p_product_model);
     OPEN getAttribute;
LOOP
     FETCH getAttribute INTO l_attribute;
     EXIT WHEN getAttribute%NOTFOUND;
     DELETE FROM pattern_str_temp WHERE Product_Model_Name=p_product_model
     and child_type = 'Attribute' and child_Name= l_attribute;
     END LOOP;
     CLOSE getAttribute;
     RETURN l_count;
EXCEPTION
WHEN OTHERS THEN
dbms_output.put_line(SQLERRM);
          --dbms_output.put_line('ERROR in CUSOR');
          ROLLBACK;
END;
PROCEDURE delete_batch_woc_model(p_product_model IN VARCHAR2,p_flag IN VARCHAR2,
p_err_mesg OUT VARCHAR2)
     IS
     p_request_status VARCHAR2(30);
BEGIN
     deleteCategory(p_product_model,p_request_status ,p_err_mesg );
EXCEPTION WHEN OTHERS THEN
     dbms_output.put_line(SQLERRM);
          p_err_mesg := 'ERROR IN CUSOR';
          dbms_output.put_line('ERROR in CUSOR');
          ROLLBACK;
END;
END Woc_Delete_Model_Data;
--drop table pattern_str_temp ;
SHOW ERRORS;
But once the data is deleted , the data in the temp table is deleted when I load the data and try to delete it agian since I have no data in temp table ,the data is not deleted .So I need to create the temp table every time the stored procedure is called ,delete accordingly and drop the table at the end .
Please suggest how to do it.
Thanks.

Answer 1

I'm not sure I understand what you're attempting to do...
What is the benefit of a temporary table that stores the same set of data that is in the master table? Why not just
DELETE FROM child_table1
WHERE foreign_key IN (
    SELECT primary_key
      FROM master_table
     WHERE some_condition);
DELETE FROM child_table2
WHERE foreign_key IN (
    SELECT primary_key
      FROM master_table
     WHERE some_condition);
DELETE FROM child_table30
WHERE foreign_key IN (
    SELECT primary_key
      FROM master_table
     WHERE some_condition);
DELETE FROM master_table
WHERE some_condition;or
FOR x IN (SELECT * FROM master_table WHERE some_condition)
LOOP
  DELETE FROM child_table1 WHERE foreign_key = x.primary_key;
  DELETE FROM child_table2 WHERE foreign_key = x.primary_key;
  DELETE FROM child_table30 WHERE foreign_key = x.primary_key;
  DELETE FROM master_table WHERE primary_key = x.primary_key;
END LOOP;Justin