rollback | 易学教程

Is it a better practice to explicitly call transaction rollback or let an exception trigger an implicit rollback?

阅读更多关于 Is it a better practice to explicitly call transaction rollback or let an exception trigger an implicit rollback?

问题 In the below code if any exception is thrown while executing the the SQL statements we should expect an implicit rollback on the transaction as the transaction was not committed, it goes out of scope and it gets disposed: using (DbTransaction tran = conn.BeginTransaction()) { // // Execute SQL statements here... // tran.Commit(); } Is the above an acceptable practice, or should one catch the exception and explicitly make a call to tran.Rollback() as shown below: using (DbTransaction tran =

Is there any way to rollback after commit in MySQL?

阅读更多关于 Is there any way to rollback after commit in MySQL?

问题 I did a big mistake that I updated a table without 'where' clause in MySQL :'( It is auto-committed. Is there any way to rollback from it? 回答1: No, there's no query that will "undo" a committed data-modifying query. If you have a backup of the database, you can restore the backup and use DBA tools (in MySQL's case, it's mysqlbinlog) to "replay" all data-modifying queries from the logs since the backup back to the database, but skip over the problem query. If you don't have a backup and all

How do I roll back a file checked in to Clearcase?

阅读更多关于 How do I roll back a file checked in to Clearcase?

I have a file in my Clearcase repository. I checked it out and modified it, and then checked it back in. I haven't done anything like make a baseline, or rebase, or deliver in my stream/view. I regret having made the changes to this file--I should have undone the checkout, in retrospect. How do I roll back the modifications? (Or undo, or revert, or whatever the correct nomenclature is.) VonC What is described by skwllsp can be be done in a dynamic view through the use of extended pathnames cd m:/myDynamicView/MyVob/path/to/file cleartool lsvtree myFile cleartool checkout -c "cancel co" myFile

Google App Engine: appcfg.py rollback

阅读更多关于 Google App Engine: appcfg.py rollback

问题 I'm using Windows 7 and for the life of me I cannot figure out how to call the rollback function on appcfg.py. All I want to know is what to type into the command prompt so I can rollback my app. 回答1: The rollback command can rollback a transaction on the server, but you are unlikely to need to use that unless an update of your app failed for some reason. You should be getting some feedback from appcfg.py that such an action is required. Is that what you want to do? If so, just open a command

How to perform SQL Roll back from transaction logs

阅读更多关于 How to perform SQL Roll back from transaction logs

问题 I have transaction log file that goes back 6 months. I need to roll back everything that happened after 5/20/2013 from a database. Can anyone please enlighten me on how to do this? 回答1: First of all, copy the database MDF and LDF files. Better safe than sorry The database can be restored to a point in time in SQL Server 2008R2, also. There's no need to create a transaction log backup first, it'll be done automatically by SQL Server. You can find more about the log-tail backup here: Tail-Log

Strange behaviour with @Transactional(propagation=Propagation.REQUIRES_NEW)

阅读更多关于 Strange behaviour with @Transactional(propagation=Propagation.REQUIRES_NEW)

问题 Here is my problem : I'm running a batch on a Java EE/Spring/Hibernate application. This batch calls a method1 . This method calls a method2 which can throw UserException (a class extending RuntimeException ). Here is how it looks like : @Transactional public class BatchService implements IBatchService { @Transactional(propagation=Propagation.REQUIRES_NEW) public User method2(User user) { // Processing, which can throw a RuntimeException } public void method1() { // ... try { this.method2

mysql transaction - roll back on any exception

阅读更多关于 mysql transaction - roll back on any exception

Is it possible to roll back automatically if any error occurs on a list of mysql commands? for example something along the lines of: begin transaction; insert into myTable values1 ... insert into myTable values2 ...; -- will throw an error commit; now, on execute i want the whole transaction to fail, and therefore i should NOT see values1 in myTable. but unfortunately the table is being pupulated with values1 even though the transaction has errors. any ideas how i make it to roll back? (again, on any error)? EDIT - changed from DDL to standard SQL You can use 13.6.7.2. DECLARE ... HANDLER

Transaction rollback and web services

阅读更多关于 Transaction rollback and web services

问题 Given an example of calling two web services methods from a session bean, what if an exception is thrown between the calls to two methods? In the case of not calling the web services the transaction will rollback and no harm done. However, the web service will not rollback. Of course, even with a single web service there is a problem. While this is a generic question I am interested in solutions having to do with EJB session beans. An easy and customized answer would be to add a special

How to rollback a specific migration?

阅读更多关于 How to rollback a specific migration?

I have the following migration file db\migrate\20100905201547_create_blocks.rb How can I specifically rollback that migration file? Zachary Wright rake db:rollback STEP=1 Is a way to do this, if the migration you want to rollback is the last one applied. You can substitute 1 for however many migrations you want to go back. For example: rake db:rollback STEP=5 Will also rollback all the migration that happened later (4, 3, 2 and also 1). To roll back all migrations back to (and including) a target migration, use: (This corrected command was added AFTER all the comments pointing out the error in

How to revert (Roll Back) a checkin in TFS 2010

阅读更多关于 How to revert (Roll Back) a checkin in TFS 2010

问题 Can anyone tell me how to revert (roll back) a checkin in TFS 2010? 回答1: You have two options for rolling back (reverting) a changeset in Team Foundation Server 2010 Version Control. First option is using the User Interface (if you have the latest version of the TFS 2010 Power Tools installed). The other option is using the TFS 2010 version control command-line application: tf.exe rollback I have information about both approaches on my blog post. For Team Foundation Server 2012, 2013, or