How can I undo a mysql statement that I just executed

Question

How can I undo the most recently executed mysql query

User · Answer

You can stop a query which is being processed by this  Find the Id of the query  process by     show processlist   Then                                     kill  id

User · Answer

For some instrutions  like ALTER TABLE  this is not possible with MySQL  even with transactions  1 and 2

User · Answer

If you define table type as InnoDB  you can use transactions  You will need set AUTOCOMMIT 0  and after you can issue COMMIT or ROLLBACK at the end of query or session to submit or cancel a transaction    ROLLBACK -- will undo the changes that you have made

User · Answer

in case you do not only need to undo your last query  although your question actually only points on that  I know  and therefore if a transaction might not help you out  you need to implement a workaround for this    copy the original data before commiting your query and write it back on demand based on the unique id that must be the same in both tables  your rollback-table  with the copies of the unchanged data  and your actual table  containing the data that should be  undone  than    for databases having many tables  one single  rollback-table  containing structured dumps copies of the original data would be better to use then one for each actual table  it would contain the name of the actual table  the unique id of the row  and in a third field the content in any desired format that represents the data structure and values clearly  e g  XML   based on the first two fields this third one would be parsed and written back to the actual table  a fourth field with a timestamp would help cleaning up this rollback-table    since there is no real undo in SQL-dialects despite  rollback  in a transaction  please correct me if I m wrong - maybe there now is one   this is the only way  I guess  and you have to write the code for it on your own

User · Answer

You can only do so during a transaction   BEGIN  INSERT INTO xxx      DELETE FROM        Then you can either   COMMIT  -- will confirm your changes   Or  ROLLBACK -- will undo your previous changes

User · Answer

Basically  If you re doing a transaction just do a rollback  Otherwise  you can t  undo  a MySQL query

[mysql] How can I undo a mysql statement that I just executed?

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