BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  EVariantTypeCastError When Using SQL Server          BorlandTalk.com Forum Index -> C++ Builder Databases (SQL Servers) View previous topic :: View next topic   Author Message Jacques Zoo Guest Posted: Sat May 08, 2004 6:30 pm    Post subject: EVariantTypeCastError When Using SQL Server I created a table in MS SQL Server to use in a C++ Builder database. I used the ADOTable and its ConnectionString to connect to the database. When I run the form that hosts the controls, I receive an "...EVariantTypeCastError With Message 'Could Not Convert Variant Of Type (Null) Into Type (String)'..." After I click OK, everything is fine, the form works fine. Since I find this message annoying, I was just wondering if somebody knows how I can fix/treat it. Thanks. Back to top James Peterson Guest Posted: Mon May 10, 2004 12:54 pm    Post subject: Re: EVariantTypeCastError When Using SQL Server I was having problems with this also till I changed my primary key from a char to a varchar. And for some reason that fixed my problem. "Jacques Zoo" <jezoo (AT) yahoo (DOT) com> wrote Quote: I created a table in MS SQL Server to use in a C++ Builder database. I used the ADOTable and its ConnectionString to connect to the database. When I run the form that hosts the controls, I receive an "...EVariantTypeCastError With Message 'Could Not Convert Variant Of Type (Null) Into Type (String)'..." After I click OK, everything is fine, the form works fine. Since I find this message annoying, I was just wondering if somebody knows how I can fix/treat it. Quote: Thanks. Back to top Jacques Zoo Guest Posted: Tue May 11, 2004 12:11 pm    Post subject: Re: EVariantTypeCastError When Using SQL Server Since I don't like to let users play with the primary key, I always create it as int with Identity that autoincrements. Instead of changing the data type on the primary key, is there another solution? "James Peterson" <jpeterson (AT) romanmealmilling (DOT) com> wrote: Quote: I was having problems with this also till I changed my primary key from a char to a varchar. And for some reason that fixed my problem. "Jacques Zoo" <jezoo (AT) yahoo (DOT) com> wrote in message news:409d274d$1 (AT) newsgroups (DOT) borland.com... I created a table in MS SQL Server to use in a C++ Builder database. I used the ADOTable and its ConnectionString to connect to the database. When I run the form that hosts the controls, I receive an "...EVariantTypeCastError With Message 'Could Not Convert Variant Of Type (Null) Into Type (String)'..." After I click OK, everything is fine, the form works fine. Since I find this message annoying, I was just wondering if somebody knows how I can fix/treat it. Thanks. Back to top Vladimir Stefanovic Guest Posted: Sat May 22, 2004 5:38 pm    Post subject: Re: EVariantTypeCastError When Using SQL Server Quote: When I run the form that hosts the controls, I receive an "...EVariantTypeCastError With Message 'Could Not Convert Variant Of Type (Null) Into Type (String)'..." This is how I solved this in classic DB (ADO) programming... Double (left) click on the Table object in DataModule (if you stated it there) and than right click and "Add all fields"... Rebuild All... 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