BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Primary key problems          BorlandTalk.com Forum Index -> Delphi Databases (dbExpress) View previous topic :: View next topic   Author Message Ciaran Costelloe Guest Posted: Sun Jan 08, 2006 9:23 pm    Post subject: Primary key problems I am trying to create a table with a primary key based on the first two fields by sending the following SQL through a TSQLConnection to a Firebird database via an Interbase driver, but it fails: "CREATE TABLE SINDEX (ALIASUPPER VARCHAR(211) NOT NULL PRIMARY KEY,REPETITN SMALLINT NOT NULL PRIMARY KEY,ALIAAS VARCHAR(211),RECORDNO INTEGER)" I get an error rather than success, but I cannot determine the exact error because I have messed up some DLL in trying to get various connections working, so I just get exceptions "No mapping for error code found" (in all other respects, my Interbase driver appears to be fine). Using a primary key on one field works fine (but I cannot use this in practice because the first field is not unique): "CREATE TABLE SINDEX (ALIASUPPER VARCHAR(211) NOT NULL PRIMARY KEY,REPETITN SMALLINT,ALIAAS VARCHAR(211),RECORDNO INTEGER)" I can also create it with no primary index and add an index on the first field (which is how I will be accessing it) but I try to avoid this, as it caused me major performance problems with Paradox. Anyway, the question is whether my SQL command is wrong in some respect? Thanks in advance for any help, Ciaran Back to top ssamayoa Guest Posted: Mon Jan 09, 2006 4:08 pm    Post subject: Re: Primary key problems The problem is simple: multi column primary key arent specified as you did. the correct would be: "CREATE TABLE SINDEX (ALIASUPPER VARCHAR(211) NOT NULL,REPETITN SMALLINT NOT NULL ,ALIAAS VARCHAR(211),RECORDNO INTEGER, PRIMARY KEY (ALIASUPPER, REPETITN))" --- posted by geoForum on http://delphi.newswhat.com Back to top Ciaran Costelloe Guest Posted: Mon Jan 09, 2006 11:10 pm    Post subject: Re: Primary key problems ssamayoa wrote: Quote: "CREATE TABLE SINDEX (ALIASUPPER VARCHAR(211) NOT NULL,REPETITN SMALLINT NOT NULL ,ALIAAS VARCHAR(211),RECORDNO INTEGER, PRIMARY KEY (ALIASUPPER, REPETITN))" Thanks very much for the reply. My apologies, I should have stated that I had previously tried that method, but it did not work either (TSQLConnection returns success, but the table is not created - weird). I recoded and tried it again, but it is still the same :-( Thanks anyway, Ciaran Back to top Thomas Miller Guest Posted: Tue Jan 10, 2006 4:31 pm    Post subject: Re: Primary key problems Did you issue a commit after that? Ciaran Costelloe wrote: Quote: ssamayoa wrote: "CREATE TABLE SINDEX (ALIASUPPER VARCHAR(211) NOT NULL,REPETITN SMALLINT NOT NULL ,ALIAAS VARCHAR(211),RECORDNO INTEGER, PRIMARY KEY (ALIASUPPER, REPETITN))" Thanks very much for the reply. My apologies, I should have stated that I had previously tried that method, but it did not work either (TSQLConnection returns success, but the table is not created - weird). I recoded and tried it again, but it is still the same :-( Thanks anyway, Ciaran -- Thomas Miller Chrome Portal Project Manager Wash DC Delphi SIG Chairperson Delphi Client/Server Certified Developer BSS Accounting & Distribution Software BSS Enterprise Accounting FrameWork http://www.bss-software.com http://www.cpcug.org/user/delphi/index.html http://sourceforge.net/projects/chromeportal/ http://sourceforge.net/projects/uopl/ http://sourceforge.net/projects/dbexpressplus Back to top Ciaran Costelloe Guest Posted: Tue Jan 10, 2006 8:40 pm    Post subject: Re: Primary key problems Thomas Miller wrote: Quote: Did you issue a commit after that? No, because I did not think I needed to. I will try that out. I have not being using commits at all, because I thought they were only used in transactions - am I implicitly opening a transaction somehow? Thanks very much for the pointer. Ciaran Back to top Thomas Miller Guest Posted: Tue Jan 10, 2006 9:48 pm    Post subject: Re: Primary key problems Yes and no. It could be a bug in the driver as this is a DDL statement and works a bit differently. Also, Firebird doesn't auto commit DDL statements like many other DBs. Just send a second statement to the server with 'COMMIT' as the only item. The http://www.upscene.com drive use to have this "bug", but works fine now. Ciaran Costelloe wrote: Quote: Thomas Miller wrote: Did you issue a commit after that? No, because I did not think I needed to. I will try that out. I have not being using commits at all, because I thought they were only used in transactions - am I implicitly opening a transaction somehow? Thanks very much for the pointer. Ciaran -- Thomas Miller Chrome Portal Project Manager Wash DC Delphi SIG Chairperson Delphi Client/Server Certified Developer BSS Accounting & Distribution Software BSS Enterprise Accounting FrameWork http://www.bss-software.com http://www.cpcug.org/user/delphi/index.html http://sourceforge.net/projects/chromeportal/ http://sourceforge.net/projects/uopl/ http://sourceforge.net/projects/dbexpressplus Back to top Ciaran Costelloe Guest Posted: Tue Jan 10, 2006 11:23 pm    Post subject: Re: Primary key problems Thomas Miller wrote: Quote: Just send a second statement to the server with 'COMMIT' as the only item. Thanks Thomas. I tried it but it did not work. Since what I am trying is obviously not totally stupid, it is presumably a bug somewhere: I can work around it for the moment by adding a "record number" field and using that as the Primary Key and adding an index on the two existing fields, which does execute properly. The bug should disappear, as I am awaiting delivery of D2006 Enterprise (which may help sort out my DLL problems), plus I will be using a later Firebird version on a different box. I was really afraid my lack of SQL knowledge was the problem, thanks to you both for the benefit of your wisdom. Ciaran Back to top ssamayoa Guest Posted: Wed Jan 11, 2006 4:44 pm    Post subject: Re: Primary key problems What is the exact error message? --- posted by geoForum on http://delphi.newswhat.com Back to top Ciaran Costelloe Guest Posted: Thu Jan 12, 2006 12:04 am    Post subject: Re: Primary key problems ssamayoa wrote: Quote: What is the exact error message? I cannot get any error messages because I have some problem with my mixture of DLLs, I just get exceptions "No mapping for error code found" (I do get a success or fail return code, however) - there is a bit more info on this in my first post, and I am hoping that D2006 will sort that out, when I get it. Anyway, I think I have found out a bit more about this, and it appears to be just a one-off issue: I changed the table structure and used a "record number" field and used that as the primary key, and had no problem creating the table. I then added two additional indexes, one on the ALIASUPPER field and one the two fields I originally had as the primary keys, ALIAS and REPETITION - while no error was reported on creating either index, only the first one was created, the same as what I experienced with CREATE TABLE. I need to explain more at this point. All the SQL is being generated dynamically by a class that I have written. The curious bit is that the same code has no problem creating indexes with two fields on other tables. The problem may be down to the field names I am using - this previously occured to me, so I tried names of ALIAAS instead of ALIAS and REPETITN instead of REPETITION, but it is possible that I did not code this correctly somewhere or that the ALIASUPPER field name, or the SINDEX table name, is the problem. It may be that the Firebird server parses the SQL request and finds no problem, and then sends back a success response, but it subsequently hits a problem preventing it creating the index. Anyway, it looks like a one-off issue rather than a general problem, I will post back if I can find exactly what the issue is. 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