rollback

问题 Consider the following: START TRANSACTION; BEGIN; INSERT INTO prp_property1 (module_name,environment_name,NAME,VALUE) VALUES ('','production','','300000'); /** Assume there is syntax error SQL here...**/ Blah blah blah DELETE FROM prp_property1 WHERE environment_name = 'production'; COMMIT TRANSACTION; Question: I noticed that the transaction automatically rolls back and the record insert attempt fails. If I don't provide a error handler or error check along with ROLLBACK TRANSACTION as above

问题 I've got a problem, and all articles or examples I found seem to not care about it. I want to do some database actions in a transaction. What I want to do is very similar to most examples: using (SqlConnection Conn = new SqlConnection(_ConnectionString)) { try { Conn.Open(); SqlTransaction Trans = Conn.BeginTransaction(); using (SqlCommand Com = new SqlCommand(ComText, Conn)) { /* DB work */ } } catch (Exception Ex) { Trans.Rollback(); return -1; } } But the problem is that the SqlTransaction

问题 I\'ve got an IDbTransaction in a using statement but I\'m unsure if it will be rolled back if an exception is thrown in a using statement. I know that a using statement will enforce the calling of Dispose()...but does anyone know if the same is true for Rollback()? Update: Also, do I need to call Commit() explicitly as I have below or will that also be taken care of by the using statement? My code looks sort of like this: using Microsoft.Practices.EnterpriseLibrary.Data; ... using

问题 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.) 回答1: What is described by skwllsp can be be done in a dynamic view through the use of extended pathnames

问题 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

问题 I have the following migration file db\\migrate\\20100905201547_create_blocks.rb How can I specifically rollback that migration file? 回答1: 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

问题 this might be a trivial question but: Since ADO.NET entity framework automatically tracks changes (in generated entities) and therefore keeps the original values, how can I rollback changes made to the entity objects? I have a form which allows the user to edit a set of \"Customer\" entities in a grid view. Now I have two buttons \"Accept\" and \"Revert\": if \"Accept\" is clicked, I call Context.SaveChanges() and the changed objects are written back to the database. If \"Revert\" is clicked,