BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  swapping two values in db          BorlandTalk.com Forum Index -> Delphi Databases (ADO) View previous topic :: View next topic   Author Message Pascal Schmidt-Volkmar Guest Posted: Mon Dec 29, 2003 7:21 am    Post subject: swapping two values in db Hi there, I have entries in my db, each having a unique number. Now I would like to change two entries so they just swap their numbers. example: entry A with number 2 entry B with number 3 later: entry A with number 3 entry B with number 2 How could this be done? I tried a stored procedure but I failed because after changing the first of both values, the primary key was violated. Maybe I do need a third variable to store one of the two numbers.... Thanks for any help!! Pascal Back to top Bill Todd (TeamB) Guest Posted: Mon Dec 29, 2003 12:43 pm    Post subject: Re: swapping two values in db Please do not multipost or cross post your messages. It violates Borland's guidelines for using their newsgroups and wastes everyone's time. Please post one message in the most appropriate newsgroup and please take a moment to read the newsgroup guidelines at http://info.borland.com/newsgroups/guide.html Change A to 99. Change B to 2. Change A to 3. -- Bill (TeamB) (TeamB cannot respond to questions received via email) Back to top Dmeister Guest Posted: Tue Dec 30, 2003 12:52 pm    Post subject: Re: swapping two values in db You've violated a basice database design rule by associating intelligence with your Primary key. Your primary key should never be touched once created. You should have a completely agnostic PK in addition to your unique number field which you can manipulate to your heart's content. "Pascal Schmidt-Volkmar" <pascalsv (AT) nospam_tauth (DOT) com> wrote Quote: Hi there, I have entries in my db, each having a unique number. Now I would like to change two entries so they just swap their numbers. example: entry A with number 2 entry B with number 3 later: entry A with number 3 entry B with number 2 How could this be done? I tried a stored procedure but I failed because after changing the first of both values, the primary key was violated. Maybe I do need a third variable to store one of the two numbers.... Thanks for any help!! Pascal Back to top Brett Watters Guest Posted: Tue Dec 30, 2003 6:58 pm    Post subject: Re: swapping two values in db Pascal, Create column C. Set C = A then Set A = B and B = C finally, Drop column C. Thanks, Brett "Pascal Schmidt-Volkmar" <pascalsv (AT) nospam_tauth (DOT) com> wrote Quote: Hi there, I have entries in my db, each having a unique number. Now I would like to change two entries so they just swap their numbers. example: entry A with number 2 entry B with number 3 later: entry A with number 3 entry B with number 2 How could this be done? I tried a stored procedure but I failed because after changing the first of both values, the primary key was violated. Maybe I do need a third variable to store one of the two numbers.... Thanks for any help!! Pascal Back to top Tony J Hopkinson Guest Posted: Tue Dec 30, 2003 9:03 pm    Post subject: Re: swapping two values in db On Mon, 29 Dec 2003 08:21:34 +0100, "Pascal Schmidt-Volkmar" <pascalsv (AT) nospam_tauth (DOT) com> wrote: Quote: Hi there, I have entries in my db, each having a unique number. Now I would like to change two entries so they just swap their numbers. example: entry A with number 2 entry B with number 3 later: entry A with number 3 entry B with number 2 How could this be done? I tried a stored procedure but I failed because after changing the first of both values, the primary key was violated. Maybe I do need a third variable to store one of the two numbers.... Thanks for any help!! Pascal In a stored procedure. Begin a transaction Just select both records into variables if there aren't too many fields (if there are use a temporary table). Delete both records. insert them back in swapped over commit the transaction or on an error rollback the transaction another method would be to select the data into variables / temporary table. the execute update statements from the saved data essentially overwriting everthing but the primary key for each record to be swapped. Wrap the above in a transaction as well as a fail midway hrough the swap will mess your table up considerably. 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