BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  TSQLQuery & Date fields          BorlandTalk.com Forum Index -> Delphi Databases (dbExpress) View previous topic :: View next topic   Author Message Angel Torrecillas de Pedr Guest Posted: Wed Jan 28, 2004 9:44 am    Post subject: TSQLQuery & Date fields Hi I have an application that connects to a SQLServer database through dbExpress. I have a TSQLQuery with an insert statement that has some parameters. If I assign a datetime value to the parameter of a datetime field, the statement works fine, but if I want to assign a null value to this parameter, the statement raise an exception saying that the value of the parameter is not valid. I try different ways to do this, but the result was the same: - TSQLQuery.ParamByName('Date_param').Value := null - TSQLQuery.ParamByName('Date_param').AsString := '' - TSQLQuery.ParamByName('Date_param').AsSQLTimeStamp := NullSQLTimeStamp; - TSQLQuery.ParamByName('Date_param').Clear; How Can I do it? Any ideas? Thaks in advance Back to top Harald Feigel Guest Posted: Wed Jan 28, 2004 8:43 pm    Post subject: Re: TSQLQuery & Date fields Hi, if you want to assign a NULL value to any of your parameters, regardless if SQLTimeStamp or String or whatsoever, you will also have to specifiy: TSQLQuery.ParamByName('Date_param').Bound := TRUE; Have a look at that property in your online help. There is a good description. Harry "Angel Torrecillas de Pedro" <angel (AT) egaraset (DOT) com> schrieb im Newsbeitrag news:4017847b (AT) newsgroups (DOT) borland.com... Quote: Hi I have an application that connects to a SQLServer database through dbExpress. I have a TSQLQuery with an insert statement that has some parameters. If I assign a datetime value to the parameter of a datetime field, the statement works fine, but if I want to assign a null value to this parameter, the statement raise an exception saying that the value of the parameter is not valid. I try different ways to do this, but the result was the same: - TSQLQuery.ParamByName('Date_param').Value := null - TSQLQuery.ParamByName('Date_param').AsString := '' - TSQLQuery.ParamByName('Date_param').AsSQLTimeStamp := NullSQLTimeStamp; - TSQLQuery.ParamByName('Date_param').Clear; How Can I do it? Any ideas? Thaks in advance Back to top Roberto Novakosky Guest Posted: Fri Jan 30, 2004 8:29 pm    Post subject: Re: TSQLQuery & Date fields I already saw this problem: I used bound too: //... TSQLQuery.ParamByName('MyParam').Clear TSQLQuery.ParamByName('MyParam').Bound := TRUE; //... Or clearing visual DBEdit (without display seted). Other solution is to delete the param and to create it again. If someone know other solution i would like to know too. :-) Roberto Novakosky São Paulo - Brazil Back to top Angel Torrecillas de Pedr Guest Posted: Mon Feb 02, 2004 12:02 pm    Post subject: Re: TSQLQuery & Date fields I try to set the Bound property to True, but when I call the ExecSQL method, the same error appear: "No value for parameter 'MyParam'".... I don't know what more can I do to assign a null to this parameter...I don't understand what is wrong... thanks also "Roberto Novakosky" <rnovak (AT) ig (DOT) com.br> escribió en el mensaje news:401ABEA4.4090506 (AT) ig (DOT) com.br... Quote: I already saw this problem: I used bound too: //... TSQLQuery.ParamByName('MyParam').Clear TSQLQuery.ParamByName('MyParam').Bound := TRUE; //... Or clearing visual DBEdit (without display seted). Other solution is to delete the param and to create it again. If someone know other solution i would like to know too. :-) Roberto Novakosky São Paulo - Brazil Back to top A Pham Guest Posted: Sat Feb 07, 2004 9:27 pm    Post subject: Re: TSQLQuery & Date fields try this TSQLQuery.ParamByName('Date_param').Clear; TSQLQuery.ParamByName('Date_param').Bound := True TSQLQuery.ParamByName('Date_param').DataType := ftDate; Cheers A Pham "Angel Torrecillas de Pedro" <angel (AT) egaraset (DOT) com> wrote Quote: Hi I have an application that connects to a SQLServer database through dbExpress. I have a TSQLQuery with an insert statement that has some parameters. If I assign a datetime value to the parameter of a datetime field, the statement works fine, but if I want to assign a null value to this parameter, the statement raise an exception saying that the value of the parameter is not valid. I try different ways to do this, but the result was the same: - TSQLQuery.ParamByName('Date_param').Value := null - TSQLQuery.ParamByName('Date_param').AsString := '' - TSQLQuery.ParamByName('Date_param').AsSQLTimeStamp := NullSQLTimeStamp; - TSQLQuery.ParamByName('Date_param').Clear; How Can I do it? Any ideas? Thaks in advance Back to top Roberto Novakosky Guest Posted: Sun Feb 08, 2004 3:18 pm    Post subject: Re: TSQLQuery & Date fields Try it If Delhi 3: At Design time go to the Params(object Inspector) |The option "null" must be checked to accept null values. If delhpi 7: At Design Time go to the Params(object inspector) | choose the param, open a level on +Value, set the type to "NULL" (the default is unassigned). I don't know if it resolves your problem, but try. Angel Torrecillas de Pedro escreveu: Quote: I try to set the Bound property to True, but when I call the ExecSQL method, the same error appear: "No value for parameter 'MyParam'".... I don't know what more can I do to assign a null to this parameter...I don't understand what is wrong... thanks also "Roberto Novakosky" <rnovak (AT) ig (DOT) com.br> escribió en el mensaje news:401ABEA4.4090506 (AT) ig (DOT) com.br... I already saw this problem: I used bound too: //... TSQLQuery.ParamByName('MyParam').Clear TSQLQuery.ParamByName('MyParam').Bound := TRUE; //... Or clearing visual DBEdit (without display seted). Other solution is to delete the param and to create it again. If someone know other solution i would like to know too. Roberto Novakosky São Paulo - Brazil Back to top Angel Torrecillas de Pedr Guest Posted: Thu Feb 12, 2004 11:55 am    Post subject: Re: TSQLQuery & Date fields This is the solution!! It's necesarry to set the datatype property too!!! Thank you very much! "A Pham" <apz28 (AT) hotmail (DOT) com> escribió en el mensaje news:40255494$1 (AT) newsgroups (DOT) borland.com... Quote: try this TSQLQuery.ParamByName('Date_param').Clear; TSQLQuery.ParamByName('Date_param').Bound := True TSQLQuery.ParamByName('Date_param').DataType := ftDate; Cheers A Pham "Angel Torrecillas de Pedro" <angel (AT) egaraset (DOT) com> wrote in message news:4017847b (AT) newsgroups (DOT) borland.com... Hi I have an application that connects to a SQLServer database through dbExpress. I have a TSQLQuery with an insert statement that has some parameters. If I assign a datetime value to the parameter of a datetime field, the statement works fine, but if I want to assign a null value to this parameter, the statement raise an exception saying that the value of the parameter is not valid. I try different ways to do this, but the result was the same: - TSQLQuery.ParamByName('Date_param').Value := null - TSQLQuery.ParamByName('Date_param').AsString := '' - TSQLQuery.ParamByName('Date_param').AsSQLTimeStamp := NullSQLTimeStamp; - TSQLQuery.ParamByName('Date_param').Clear; How Can I do it? Any ideas? 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