Avatar of marrowyung
marrowyung asked on

create MySQL table if not exists, ignore the talbe if it exists but still needs checking.

right now I have the script to only create table if it doesn't exist:

CREATE PROCEDURE `create_auditriggers_forALL` (IN databaseName VARCHAR(40))  	
BEGIN  
DECLARE a, b, finished  INT DEFAULT 10;
DECLARE temptable VARCHAR(50);	
DECLARE today TIMESTAMP DEFAULT CURRENT_DATE;
DECLARE v1, v2, v3 TINYINT ;
DECLARE current_tablelist VARCHAR(50) DEFAULT ""; 
DECLARE fullexcutecmd VARCHAR(5000);
DECLARE fullexcutecmd2 VARCHAR(5000) ;
DECLARE BEFORE_DELETE TEXT  ;
DECLARE Final_BEFORE_DELETE TEXT DEFAULT "";
DECLARE AFTER_INSERT TEXT  ;
DECLARE Final_AFTER_INSERT TEXT DEFAULT ""  ;
DECLARE AFTER_UPDATE TEXT  ;
DECLARE Final_AFTER_UPDATE TEXT DEFAULT "";
DECLARE Check_Each_PrimaryKey_Autoincrement TEXT  ;
DECLARE Final_Check_Each_PrimaryKey_Autoincrement TEXT DEFAULT "";
DECLARE Check_index TEXT  ;
DECLARE Final_Check_index TEXT DEFAULT "";
 
 declare tablename CURSOR FOR 	

         SELECT  DISTINCT TABLE_NAME 	
    FROM INFORMATION_SCHEMA.TABLES
    WHERE TABLE_SCHEMA=databaseName and table_type<> 'view' ;  
  

    
DECLARE CONTINUE HANDLER FOR NOT FOUND SET finished = 1;     
/*Specify what to do when no more records found, notice that the handler declaration must appear after variable and cursor declaration inside the stored procedures*/  	

OPEN tablename;	

	get_tabeslist: LOOP	
 
   FETCH tablename INTO current_tablelist;	
         IF finished = 1 THEN 	
          LEAVE  get_tabeslist;	
          END IF;	
  /* create the audit database's table */
  
SET @fullexcutecmd =CONCAT( 'CREATE TABLE IF NOT EXISTS Audit_info.',databaseName,'_DBAudit_', current_tablelist,' LIKE ',databaseName,'.',current_tablelist,';'); 
 
  PREPARE stmt FROM @fullexcutecmd;
  EXECUTE stmt;
  DEALLOCATE PREPARE stmt;  


  END LOOP  get_tabeslist;	
close tablename;                             

END $$
DELIMITER ; 
    

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but it seems that if I execute this SP more than one time, and it see the same table which was created, will give error message and stop.

Anyway to fix it ?
MySQL Server

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Last Comment
marrowyung

8/22/2022 - Mon
Kishan Zunjare

ASKER
marrowyung

I need more specific answer.
ASKER
marrowyung

for example I can do this to BYPASS it by:


     SELECT  DISTINCT TABLE_NAME
    FROM INFORMATION_SCHEMA.TABLES
    WHERE TABLE_SCHEMA='PCCWSP' and table_type <> 'view' and TABLE_NAME NOT IN ( SELECT  DISTINCT TABLE_NAME
    FROM INFORMATION_SCHEMA.TABLES
    WHERE TABLE_SCHEMA='Audit_info' and table_type<> 'view');

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as the condition of the cursor, but the result don't allow me to check all table name everytime but only the new one.

So I have to use that first one.
Your help has saved me hundreds of hours of internet surfing.
fblack61
ASKER CERTIFIED SOLUTION
Kevin Cross

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ASKER
marrowyung

"Although, it is not jumping out at me why the IF NOT EXISTS is not working as expected"

exaction what I am thing, that's why I try to add the IF NOT EXISTS there but it don't works !!

"It may be helpful to SELECT the @fullexcutecmd variable and see what the CREATE TABLE looks like after the CONCAT to make sure it is nothing odd there.
"

this done at the beginning of this SP developement to troubleshoot everything ! MySQL is rubblish ! a lot of thing surprising DBA !

"SELECT 1 INTO auditExistsFlag"

why do this at the beginning and this variable never change to 1. And what is the main point of :

SELECT 1 INTO auditExistsFlag
FROM INFORMATION_SCHEMA.TABLES
WHERE TABLE_SCHEMA='Audit_info'
AND TABLE_NAME = CONCAT(databaseName,'_DBAudit_', current_tablelist)

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?
ASKER
marrowyung

I think the IF should be:

SELECT count(*) INTO auditExistsFlag
FROM INFORMATION_SCHEMA.TABLES
WHERE TABLE_SCHEMA='Audit_info'
AND TABLE_NAME = CONCAT(databaseName,'_DBAudit_', current_tablelist)
;

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agree?
Kevin Cross

COUNT(*) should work, but there is either one table or zero; therefore, the way I have it should also.  If it is not changing to 1, then it is not recognizing the existence of the audit table, which is why you are getting the error.
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ASKER
marrowyung

thanks, I get it done already based on your suggsetion but I do this:

DECLARE TableExistsinAuditDB int (1) DEFAULT '0' ;
..
.
.
  SELECT count(*) INTO TableExistsinAuditDB    
FROM INFORMATION_SCHEMA.TABLES            
WHERE TABLE_SCHEMA='Audit_info'                        
AND TABLE_NAME = CONCAT(databaseName,'_DBAudit_', current_tablelist);  

if TableExistsinAuditDB < 1 then

.
.
.
.

END IF;