BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Using parameters question          BorlandTalk.com Forum Index -> Delphi Databases (Desktop) View previous topic :: View next topic   Author Message Hershcu Sorin Guest Posted: Sun Apr 10, 2005 12:55 pm    Post subject: Using parameters question Hi I'm using D7 with Paradox and I have a Query that use parameters on the WHERE clauses. During the runtime the parameter value change and that change the query result. Sometimes the parameter can be empty without any value and on this case I'll like the query to ignore the parameter. Can that be done and how? Thanks Sorin Back to top Ron Guest Posted: Sun Apr 10, 2005 2:08 pm    Post subject: Re: Using parameters question Can you change the sql text for the query in your run time code? So, you would have a different SQL text for each possible condition, and then set the query to have that selected version of SQL text. HTH Ron. "Hershcu Sorin" <sorinh (AT) zahav (DOT) net.il> wrote Quote: Hi I'm using D7 with Paradox and I have a Query that use parameters on the WHERE clauses. During the runtime the parameter value change and that change the query result. Sometimes the parameter can be empty without any value and on this case I'll like the query to ignore the parameter. Can that be done and how? Thanks Sorin Back to top Bill Todd Guest Posted: Sun Apr 10, 2005 3:42 pm    Post subject: Re: Using parameters question No. You will have to remove the WHERE clause. -- Bill Todd (TeamB) TeamB cannot answer questions received via email Hershcu Sorin wrote: Quote: Can that be done and how? Back to top Wayne Niddery [TeamB] Guest Posted: Mon Apr 11, 2005 1:20 am    Post subject: Re: Using parameters question Hershcu Sorin wrote: Quote: I'm using D7 with Paradox and I have a Query that use parameters on the WHERE clauses. During the runtime the parameter value change and that change the query result. Sometimes the parameter can be empty without any value and on this case I'll like the query to ignore the parameter. Can that be done and how? If you create a stored proc to execute the query, then you can check the parameters in the proc and act accordingly. For example you can do this (not checked for syntax): create procedure Foo (param integer) return (id integer) as begin for select id from table where :param is null or field = :param into id do suspend; end end; Alternatively you can specify different SQL in the proc: if (:param is null) then for select id from table where <conditions> ... else for select id from table where <different conditions> ... -- Wayne Niddery - Logic Fundamentals, Inc. (www.logicfundamentals.com) RADBooks: http://www.logicfundamentals.com/RADBooks.html "The moment the idea is admitted into society that property is not as sacred as the laws of God and there is not a force of law and public justice to protect it, anarchy and tyranny commence." - John Adams Back to top Ron Guest Posted: Mon Apr 11, 2005 2:48 pm    Post subject: Re: Using parameters question Stored procedures with Paradox? I didn't know that could be done! Ron. "Wayne Niddery [TeamB]" <wniddery (AT) chaffaci (DOT) on.ca> wrote Quote: If you create a stored proc to execute the query, then you can check the parameters in the proc and act accordingly. For example you can do this (not checked for syntax): <snip> Back to top Wayne Niddery [TeamB] Guest Posted: Tue Apr 12, 2005 3:44 pm    Post subject: Re: Using parameters question Ron wrote: Quote: Stored procedures with Paradox? I didn't know that could be done! Good point, I managed to forget that he was using Paradox even though he did say so. -- Wayne Niddery - Logic Fundamentals, Inc. (www.logicfundamentals.com) RADBooks: http://www.logicfundamentals.com/RADBooks.html "The two most abundant elements in the universe are hydrogen and stupidity." - Harlan Ellison Back to top Ron Guest Posted: Tue Apr 12, 2005 4:28 pm    Post subject: Re: Using parameters question Long day? "Wayne Niddery [TeamB]" <wniddery (AT) chaffaci (DOT) on.ca> wrote Quote: Ron wrote: Stored procedures with Paradox? I didn't know that could be done! Good point, I managed to forget that he was using Paradox even though he did say so. -- Wayne Niddery - Logic Fundamentals, Inc. (www.logicfundamentals.com) RADBooks: http://www.logicfundamentals.com/RADBooks.html "The two most abundant elements in the universe are hydrogen and stupidity." - Harlan Ellison Back to top Wayne Niddery [TeamB] Guest Posted: Wed Apr 13, 2005 4:47 pm    Post subject: Re: Using parameters question Ron wrote: Quote: Long day? See sig... -- Wayne Niddery - Logic Fundamentals, Inc. (www.logicfundamentals.com) RADBooks: http://www.logicfundamentals.com/RADBooks.html Working for yourself is great because you get to work half days, and you can choose any twelve hours you want. 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