BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  WHERE clause Goto page 1, 2  Next          BorlandTalk.com Forum Index -> Delphi Databases (SQL Servers) View previous topic :: View next topic   Author Message Ramtin Kazemi Guest Posted: Thu Jul 08, 2004 10:07 pm    Post subject: WHERE clause Hi consider following SQL command : SELECT * FROM MyTable WHERE KeyId = :KeyId What should the value of parameter :KeyId be so that WHERE clause has no effect? (i.e. returns all records) Thanks Ramtin Kazemi Back to top Iman L Crawford Guest Posted: Thu Jul 08, 2004 10:19 pm    Post subject: Re: WHERE clause "Ramtin Kazemi" <Ramtin76Hz (AT) hotmail (DOT) com> wrote in news:40edc596 (AT) newsgroups (DOT) borland.com: Quote: What should the value of parameter :KeyId be so that WHERE clause has no effect? This changes according to DB server you're using. You could have a where clause that is like WHERE KeyId LIKE :KEY_ID and settting the paramater to % if it is blank. This only works for columns of type varchar/char. With oracle you can do something like WHERE KeyID = DECODE(:KEY_ID, 0, KeyId, :KEY_ID) and set the parameter to 0 to get all the records. You should be able to do similar things with other DBs. Other than that you can have a stored procedure return a result set, or rebuild the SQL statment everytime. -- Iman Back to top Ramtin Kazemi Guest Posted: Fri Jul 09, 2004 10:48 am    Post subject: Re: WHERE clause Hi Iman I am using MS-SQL Server and column type is 'int' . What should I do now? Thank you Back to top Paulo Juliano Horlle Guest Posted: Fri Jul 09, 2004 12:22 pm    Post subject: Re: WHERE clause Hi Ramtin! You can start a trace with Profiler to get the command that Delphi is send to SQLServer. Regards, Paulo Juliano Horlle "Ramtin Kazemi" <Ramtin76Hz (AT) hotmail (DOT) com> wrote Quote: Hi consider following SQL command : SELECT * FROM MyTable WHERE KeyId = :KeyId What should the value of parameter :KeyId be so that WHERE clause has no effect? (i.e. returns all records) Thanks Ramtin Kazemi Back to top Viatcheslav V. Vassiliev Guest Posted: Fri Jul 09, 2004 12:23 pm    Post subject: Re: WHERE clause To return all records, you should just remove WHERE. SELECT * FROM MyTable There is no way to specify parameter for KeyId and return all rows. //------------------------------------------ Regards, Vassiliev V. V. http://www.managed-vcl.com - using .Net objects in Delphi for Win32 + ADO.Net http://www.oledbdirect.com - The fastest way to access MS SQL Server, MS Jet (Access) and Interbase (through OLEDB) "Ramtin Kazemi" <Ramtin76Hz (AT) hotmail (DOT) com> ÓÏÏÂÝÉÌ/ÓÏÏÂÝÉÌÁ × ÎÏ×ÏÓÔÑÈ ÓÌÅÄÕÀÝÅÅ: news:40edc596 (AT) newsgroups (DOT) borland.com... Quote: Hi consider following SQL command : SELECT * FROM MyTable WHERE KeyId = :KeyId What should the value of parameter :KeyId be so that WHERE clause has no effect? (i.e. returns all records) Thanks Ramtin Kazemi Back to top Paulo Juliano Horlle Guest Posted: Fri Jul 09, 2004 12:30 pm    Post subject: Re: WHERE clause I'm not understood before... To get all records you can use this select: select t.* from mytable t where t.KeyID = isnull( :KeyID, t.KeyID) Now, if you send a nul value to parameter, the statement compare with KeyID field. Regards, Paulo Juliano Horlle "Ramtin Kazemi" <Ramtin76Hz (AT) hotmail (DOT) com> wrote Quote: Hi consider following SQL command : SELECT * FROM MyTable WHERE KeyId = :KeyId What should the value of parameter :KeyId be so that WHERE clause has no effect? (i.e. returns all records) Thanks Ramtin Kazemi Back to top Iman L Crawford Guest Posted: Fri Jul 09, 2004 1:09 pm    Post subject: Re: WHERE clause "Ramtin Kazemi" <Ramtin76Hz (AT) hotmail (DOT) com> wrote in news:40ee7810 @newsgroups.borland.com: Quote: I am using MS-SQL Server and column type is 'int' . What should I do now? See Paulo's message. -- Iman Back to top Tim Radford Guest Posted: Fri Jul 09, 2004 1:47 pm    Post subject: Re: WHERE clause You could try SELECT * FROM MyTable WHERE :KeyID = -1 OR KeyId = :KeyId Then supplying a value of -1 will return all rows Tim "Ramtin Kazemi" <Ramtin76Hz (AT) hotmail (DOT) com> wrote Quote: Hi consider following SQL command : SELECT * FROM MyTable WHERE KeyId = :KeyId What should the value of parameter :KeyId be so that WHERE clause has no effect? (i.e. returns all records) Thanks Ramtin Kazemi Back to top Ramtin Kazemi Guest Posted: Fri Jul 09, 2004 3:50 pm    Post subject: Re: WHERE clause Hi Tim I tried your solution but got this error : --------------------------- Error --------------------------- dbExpress Error: Invalid Parameter. --------------------------- OK --------------------------- Regards K.Ramtin Back to top Ramtin Kazemi Guest Posted: Fri Jul 09, 2004 4:00 pm    Post subject: Re: WHERE clause Hi Paulo How should I set the parameter value to "isnull( :KeyID, t.KeyID)" ? I didn't understand. Regards K.ramtin Back to top Ramtin Kazemi Guest Posted: Fri Jul 09, 2004 4:02 pm    Post subject: Re: WHERE clause Hi Tim I tried your solution but got this error : --------------------------- Error --------------------------- dbExpress Error: Invalid Parameter. --------------------------- OK --------------------------- Regards K.Ramtin Back to top Oscar Santiesteban Jr. Guest Posted: Sun Jul 11, 2004 12:44 am    Post subject: Re: WHERE clause What I would do is have something like this: (some code,some pseudo-code) adoquery1.sql.clear; adoquery1.sql.add('select * from mytable'); if keyid > 0 then // or whatever condition indicating that you want some specific records begin adoquery1.sql.add('where keyid = ' + inttostr(keyid)) end; adoquery1.open; This assumes that KEYID is an INT like you mentioned. "Ramtin Kazemi" <Ramtin76Hz (AT) hotmail (DOT) com> wrote Quote: Hi consider following SQL command : SELECT * FROM MyTable WHERE KeyId = :KeyId What should the value of parameter :KeyId be so that WHERE clause has no effect? (i.e. returns all records) Thanks Ramtin Kazemi Back to top Iman L Crawford Guest Posted: Sun Jul 11, 2004 3:49 am    Post subject: Re: WHERE clause "Ramtin Kazemi" <Ramtin76Hz (AT) hotmail (DOT) com> wrote in news:40efcf0e (AT) newsgroups (DOT) borland.com: Quote: How should I set the parameter value to "isnull( :KeyID, t.KeyID)" ? I didn't understand. You need to clear the KeyId parameter. ParamByName('KeyID').Clear; Iman Back to top Dennis Passmore Guest Posted: Sun Jul 11, 2004 5:42 pm    Post subject: Re: WHERE clause declare @fkeyid int select @fKeyid = :Keyid SELECT * FROM MyTable WHERE @fKeyid is null OR KeyId = @fKeyId Dennis Passmore Ultimate Software, Inc. Back to top Ramtin Kazemi Guest Posted: Mon Jul 12, 2004 6:54 pm    Post subject: Re: WHERE clause Hi Tim ! 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