How Build an Iteration Control

Question

Hello DBA's,
I've my barin in pieces with this issue.
I ve to create one procedure that needs :
DROP temp_table
CREATE temp_table
So I've done :
create or replace Procedure refesh_temp
is
var1 varchar2(2000);
sql varchar2(2000);
Begin
/***** STEP 1 ****/
vsql := 'drop table temp_table';
execute immediate vsql;
/***** STEP 2 ***/
vsql := 'create table temp_table as select * from tab1,tab2';
execute immediate vsql;
exception
WHEN OTHERS THEN NULL;
END refesh_temp;
Simple RIGHT?
My questions IS :
When by mystake the temp_table is alredy droped before we run the procedure
it generates an Error at step 1 because when the Procedure goes to execute the DROP TEMP_TABLE it doesn exist ....
SO I've done this :
IF TEMP TABLE EXIST THEN DROP
ELSE
CREATE TEMP_TABLE
WRONG Again because if temp table Exist it just drop the Table and do not Recreate it Right?
SO I've created a Cursor to retriev if the Table Exist
and 2 Variable Statements VSQL :
vsql1 := 'drop table temp_table'; --- Drop The Temp table
vsql2:= 'create table temp_table as select * from tab1,tab2'; ---- Create the TEMP TABLE
BEGIN
FOR REC in
(SELECT OBJECT_NAME AS VOBJ FROM USER_OBJECTS
WHERE OBJECT_NAME IN ('temp_table'')
LOOP
BEGIN
/ **** IF THE CURSOR RETURNS the TEMP TABLE NAME *****/
VAL1 := REC.VOBJ;
IF VAL1 = 'temp_table'     
THEN
EXECUTE IMMEDIATE VSQL1;
EXECUTE IMMEDIATE VSQL2;
/***** IF NOT Just Recreates The TEMp tABLE *****/
ELSIF
VAL1 IS NULL
THEN
EXECUTE IMMEDIATE VSQL2;
END IF;
END;
END LOOP;
EXCEPTION
END ;
PB it does Nothing ......
Does someone can see and tell me what I don't see ??
Txs
Rgds
Carloos

Answer 1

You could try something like this:
CREATE OR REPLACE PROCEDURE REFRESH_TEMP
AS
        drop_table      EXCEPTION;
        PRAGMA          EXCEPTION_INIT(drop_table,-942);
BEGIN
        BEGIN
                EXECUTE IMMEDIATE 'DROP TABLE TEMP_TABLE';
        EXCEPTION
                WHEN drop_table THEN
                        NULL;
        END;
        EXECUTE IMMEDIATE 'CREATE TABLE TEMP_TABLE AS SELECT * FROM TAB1,TAB2';
END;
/This catches the ORA-00942 error and ignores it so the procedure can continue.
However, I question this implementation to begin with. How does this procedure fit in with your whole process? Basically, what are you trying to do?