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 ;
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answered Nov 2 '10 at 19:04
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