mysql rollback and throw error

from:

http://stackoverflow.com/questions/4076566/how-to-detect-a-rollback-in-mysql-stored-procedure

I'm trying to figure out a way to detect an occurrence of rollback in a MySQL stored procedure so I could handle the situation accordingly from a PHP script, but so far I can not find any solution.

My stored procedure looks like this:

     delimiter | 
      create procedure multi_inserts
( 
      IN var1
int(11), 
           
. 
           
. 
           
. 
      IN string1 text 
     
) 
     
BEGIN 
 
      declare
exit handler for sqlexception rollback; 
      declare
exit handler for sqlwarning rollback; 
 
      START TRANSACTION
; 
      insert
into table1(a,b,c,d) values(var1,var2,var3,var4); 
      insert
into table2(e,f,g) values(var5,var6,string1); 
      COMMIT
; 
 
     
END 
      delimiter
; 

I did a rollback test on this procedure and it did rollback but I got no false. I want my stored procedure to throw some kind of error message if the transaction failed, so I could handle it like this:

    $result = mysql_query($procedure);  
   
if(!$result)  
   
{ 
     
//rollback occured do something    
   
} 

Is there a way to detect rollback in MySQL? Am I missing something? Any reply will be appreciated. Thanks for reading.


Thanks to your advices I fixed this problem. Here's what I did:

Stored Procedure

     delimiter | 
      create procedure multi_inserts
( 
      IN var1
int(11), 
           
. 
           
. 
           
. 
      IN string1 text 
     
) 
     
BEGIN 
 
      declare
exit handler for sqlexception sqlwarning 
     
BEGIN 
      rollback
; 
     
select -1; 
     
END; 
 
      START TRANSACTION
; 
      insert
into table1(a,b,c,d) values(var1,var2,var3,var4); 
      insert
into table2(e,f,g) values(var5,var6,string1); 
      COMMIT
; 
 
     
END 
      delimiter
; 

If I use out variable instead of select -1, it gives me this error:

OUT or INOUT argument is not a variable or NEW pseudo-variable in BEFORE trigger

I don't know what did I wrong, but I couldn't fix this problem.

PHP script

$result=mysqli_query($con,$procedure); 
if(is_object($result)) 
{ 
//rollback happened do something! 
} 

If the SP is successful it throws true.

You can add an output param and then set it to the value you want in your exit handlers.

Here's an example using your proc:

delimiter $$ 
  create procedure multi_inserts
( 
  IN var1
int(11), 
       
. 
       
. 
       
. 
  IN string1 text
, 
  OUT p_return_code tinyint
unsigned 
 
) 
 
BEGIN 
 
  DECLARE
exit handler for sqlexception 
 
BEGIN 
   
-- ERROR 
   
set p_return_code = 1; 
    rollback
; 
 
END; 
 
  DECLARE
exit handler for sqlwarning 
 
BEGIN 
   
-- WARNING 
   
set p_return_code = 2; 
    rollback
; 
 
END; 
 
  START TRANSACTION
; 
  insert
into table1(a,b,c,d) values(var1,var2,var3,var4); 
  insert
into table2(e,f,g) values(var5,var6,string1); 
  COMMIT
; 
 
 
-- SUCCESS 
 
set p_return_code = 0; 
 
 
END $$ 
  delimiter
; 
link | improve this answer
Thanks for the detailed answer. I rewrote my SP and it worked fine in MySQL console but php's mysql_query couldn't handle the result set and gave me funny error, so I updated PHP to 5.3.3 for mysqli_query. I thought this would solve it. How naive of me. After the update I got another error in Pear Auth.php which I'm using as an authentication and I cant see if mysqli_query really would solve the problem unless I solve the new problem first. The latest problem is that I cant update pear auth for some reason. I guess pear auth is incompatible with 5.3.3. Now what should I do? sorry I'm ranting.. –  Kou Nov 2 '10 at 21:53
I don't use PHP. Sorry. –  Ike Walker Nov 2 '10 at 22:45

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