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Go Back  dBforums > Database Server Software > DB2 > Drop Table in If-Else loop

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  #1 (permalink)  
Old 07-28-09, 06:03
borusik75 borusik75 is offline
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Drop Table in If-Else loop
hi all,
my aim is check if object exists then drop him
i've query:
--#SET TERMINATOR @
BEGIN ATOMIC
IF EXISTS (SELECT name FROM sysibm.systables WHERE name = 'TBL_NAME) THEN DROP TABLE 'TBL_NAME';
END IF;
END@

The error is:
DB21034E The command was processed as an SQL statement because it was not a valid Command Line Processor command.
SQL0104N An unexpected token "drop table" was found following "= 'tbl_name')
THEN ". Expected tokens may include: "<signal_stmt_head>". LINE NUMBER=3.
SQLSTATE=42601
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  #2 (permalink)  
Old 07-28-09, 06:34
sathyaram_s sathyaram_s is offline
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You cannot use a variable in a DDL .. YOu have to use dynamic sql

An alternative is to drop and ignore the warning if the table does not exists ..
Pseudocode:
Code:
CREATE PROCEDURE DROPT

P1: BEGIN
-- Declare variable
DECLARE v_sqlstate_test CHAR(5); 
DECLARE v_sqlcode_test INT;
DECLARE SQLSTATE CHAR(5) DEFAULT '00000';
DECLARE SQLCODE INT DEFAULT 0;
DECLARE v_TABLE_NOT_FOUND INT DEFAULT 0;
DECLARE c_TABLE_NOT_FOUND CONDITION FOR SQLSTATE '56098';

DECLARE CONTINUE HANDLER FOR c_TABLE_NOT_FOUND 
SET v_TABLE_NOT_FOUND = 1; 

DROP TABLE T1 ; 
IF (v_TABLE_NOT_FOUND ==1 ) tHEN "GO TO NEXT STEP" ELSE "gO TO NEXT STE" 
END IF
END IF;
END P1
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  #3 (permalink)  
Old 07-28-09, 06:59
borusik75 borusik75 is offline
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Thank you for your quick answer.
Maybe can you tell me how can i print text in DB2 (like dbms_output in oracle)
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  #4 (permalink)  
Old 07-28-09, 07:05
sathyaram_s sathyaram_s is offline
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Unless you are using DB2 9.7 - you have to use udfs ..

Making Operating System Calls from SQL

The above article (by Stolze, who freqents this forum) gives you the examples

Cheers
Sathyaram
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  #5 (permalink)  
Old 07-28-09, 09:43
borusik75 borusik75 is offline
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hi,
I tied to run your code, but didn't succeed
Can you explain your code
thanks
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  #6 (permalink)  
Old 07-28-09, 11:07
borusik75 borusik75 is offline
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What's wrong in this query ?

--#SET TERMINATOR @
BEGIN ATOMIC
--DECLARE TXT VARCHAR(100);
IF EXISTS (SELECT name FROM sysibm.systables WHERE name = 'QA_TBL') THEN
SELECT 'DROP TABLE ' || NAME AS TXT FROM sysibm.systables WHERE name = 'QA_TBL' ;
EXECUTE IMMEDIATE = TXT;
END IF;
END @
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  #7 (permalink)  
Old 07-28-09, 12:00
sathyaram_s sathyaram_s is offline
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ELECT 'DROP TABLE ' || NAME INTO TXT FROM sysibm.systables WHERE name = 'QA_TBL' ;
EXECUTE IMMEDIATE TXT;
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  #8 (permalink)  
Old 07-29-09, 02:28
borusik75 borusik75 is offline
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SELECT 'DROP TABLE ' || NAME INTO TXT FROM sysibm.systables WHERE name = 'QA_TBL' ;

wrong syntax
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  #9 (permalink)  
Old 07-29-09, 04:22
sathyaram_s sathyaram_s is offline
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I know !! sorry, i knew ...

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  #10 (permalink)  
Old 07-29-09, 07:09
borusik75 borusik75 is offline
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Quote:
Originally Posted by sathyaram_s
I know !! sorry, i knew ...

so what can i do ?
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  #11 (permalink)  
Old 07-29-09, 08:23
sathyaram_s sathyaram_s is offline
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Read the error message and the corresponding explanation in the manual ..

If you have a clarification, post here
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  #12 (permalink)  
Old 07-30-09, 07:47
borusik75 borusik75 is offline
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I've solution
1. Create SP(IN TBL VARCHAR(100)) that drop table
2. IF EXISTS (SELECT name FROM sysibm.systables WHERE name = 'QA_TBL') THEN CALL SP(TBL)
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