rollback

I have migrated my production MySQL schema to Google Cloud SQL. Various modifications have been necessitated to existing Stored Procedures & Scheduled Events, and some new ones deployed. HOWEVER, I have been noticing that where I leave everything working at 6PM, by the time I arrive back at my desk next morning, many (all?) SP & Event alterations are rolled back to some earlier state to development, and all my routines are failing or going crazy. The Data itself does not appear to be affected or rolled back, and continuous new inserts are succeeding. I'm thinking that the automatic Backup /

I use nHibernate for ORM and Ninject for IoC. I create nHibernate sessions per some custom scope (which you can assume is per request). I begin the transaction onActivation. I commit the transaction onDeactivation. The problem is that if an exception happens during the request I want to rollback the transaction rather than committing it. Any idea how to detect (in a clean way, most probably using Ninject Context) that an exception has happened? Note: I am not concerned about the exceptions that can happen on commit which I can catch in the following code and role back easily. protected void

I have multiple updates and insert statements in a procedure. Please refer below example: Procedure Example --code Update 1 insert 1 Update 2 Update 3 --Suppose exception occurs Now i want to rollback to before 1st update statement means no update or insert affects. BEGIN Savepoint do_update_1; Update 1; insert 1; Update 2; Update 3; --Suppose exception occurs EXCEPTION WHEN some_exception THEN Rollback To do_update_1; END; ====== edit ========== Working example: http://sqlfiddle.com/#!4/b94a93/1 create table tttt( id int, val int ) / declare x int := 0; begin insert into tttt values( 1,1);

What is the mechanism for Transaction Rollback in sql server? Every update in the database will first write an entry into the log containing the description of the change. Eg. if you update a column value from A to B the log will contain a record of the update, something like: in table T the column C was changed from A to B for record with key K by transaction with id I. If you rollback the transaction, the engine will start scanning the log backward looking for records of work done by your transaction and will undo the work: when it finds the record of update from A to B, will change the

This seems like a simple enough question, yet I couldn't find any definitive answers specific for MySQL. Look at this: $mysqli->autocommit(false); //Start the transaction $success = true; /* do a bunch of inserts here, which will be rolled back and set $success to false if they fail */ if ($success) { if ($mysqli->commit()) { /* display success message, possibly redirect to another page */ } else { /* display error message */ $mysqli->rollback(); //<----------- Do I need this? } } $mysqli->autocommit(true); //Turns autocommit back on (will be turned off again if needed) //Keep running