BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  TADOQuery - using 2 detail parameters for same master field          BorlandTalk.com Forum Index -> Delphi Databases (ADO) View previous topic :: View next topic   Author Message Jon Scott Guest Posted: Sat Feb 28, 2004 7:35 pm    Post subject: TADOQuery - using 2 detail parameters for same master field I use TADOQuery on an Access database and have a master/detail relationship between two tables. On the detail table SQL, I have something like: SELECT * FROM Detail WHERE ((Detail.Field1 LIKE '%' + :PARENTFIELD + '%') OR (Detail.Field2 = :PARENTFIELD)) However, I notice that TADOQuery only fills in the first parameter and ignores the second one (it is null). The only way I can get this to work is to manually fill in the parameters whenever a user moves between records on the master table and Requery the detail table. Is there a way to make this work using TADOQuery or another ADO descendant component (freeware)? Does using TADODataSet or TADOTable make any difference? I have yet to try those. -- Thanks, Jon E. Scott Blue Orb Software http://www.blueorbsoft.com Back to top Jon Scott Guest Posted: Sat Feb 28, 2004 7:39 pm    Post subject: Re: TADOQuery - using 2 detail parameters for same master fi And if it makes any difference, I'm using D5 Ent. -- Thanks, Jon E. Scott Blue Orb Software http://www.blueorbsoft.com "Jon Scott" <NOSPAMsupport (AT) blueorbsoft (DOT) comNOSPAM> wrote Quote: I use TADOQuery on an Access database and have a master/detail relationship between two tables. On the detail table SQL, I have something like: SELECT * FROM Detail WHERE ((Detail.Field1 LIKE '%' + :PARENTFIELD + '%') OR (Detail.Field2 = :PARENTFIELD)) However, I notice that TADOQuery only fills in the first parameter and ignores the second one (it is null). The only way I can get this to work is to manually fill in the parameters whenever a user moves between records on the master table and Requery the detail table. Is there a way to make this work using TADOQuery or another ADO descendant component (freeware)? Does using TADODataSet or TADOTable make any difference? I have yet to try those. -- Thanks, Jon E. Scott Blue Orb Software http://www.blueorbsoft.com Back to top Jon Scott Guest Posted: Sun Feb 29, 2004 3:19 am    Post subject: Re: TADOQuery - using 2 detail parameters for same master fi Of course, you can name a parameter whatever you want, but for TADOQuery, it must be the master table's fieldname. How else would it know what field to get the value from? Try it out and you'll see what I mean. -- Thanks, Jon E. Scott Blue Orb Software http://www.blueorbsoft.com "Brian Bushay TeamB" <BBushay (AT) Nmpls (DOT) com> wrote Quote: I use TADOQuery on an Access database and have a master/detail relationship between two tables. On the detail table SQL, I have something like: SELECT * FROM Detail WHERE ((Detail.Field1 LIKE '%' + :PARENTFIELD + '%') OR (Detail.Field2 = :PARENTFIELD)) However, I notice that TADOQuery only fills in the first parameter and ignores the second one (it is null). The only way I can get this to work is to manually fill in the parameters whenever a user moves between records on the master table and Requery the detail table. Is there a way to make this work using TADOQuery or another ADO descendant component (freeware)? Does using TADODataSet or TADOTable make any difference? I have yet to try those. -- ADO doesn't support parameters of the same name in a query. Rename your second parameter and your query will work. -- Brian Bushay (TeamB) [email]Bbushay (AT) NMPLS (DOT) com[/email] Back to top Jon Scott Guest Posted: Sun Feb 29, 2004 5:57 pm    Post subject: Re: TADOQuery - using 2 detail parameters for same master fi Yes, that's exactly what I'm doing, but thought there was a way I didn't have to do it manually. Thanks anyway. -- Jon E. Scott Blue Orb Software http://www.blueorbsoft.com "Brian Bushay TeamB" <BBushay (AT) Nmpls (DOT) com> wrote Quote: Of course, you can name a parameter whatever you want, but for TADOQuery, it must be the master table's fieldname. How else would it know what field to get the value from? Try it out and you'll see what I mean. The SQL passed to ADO can't have parameters of the same name. Borlands ADO components are not going to maintain master/Detail with your SQL. You will need to change the name of one of the parameters then write code for the master tables AfterScroll event to handle setting the detail table parameters and then REQUERY -- Brian Bushay (TeamB) [email]Bbushay (AT) NMPLS (DOT) com[/email] Back to top Vitali Kalinin Guest Posted: Mon Mar 01, 2004 9:38 am    Post subject: Re: TADOQuery - using 2 detail parameters for same master fi In this specific case you can adjust yours SQL like this: SELECT * FROM Detail WHERE ((Detail.Field1 LIKE '%' + Detail.Field2 + '%') OR (Detail.Field2 = :PARENTFIELD)) "Jon Scott" <NOSPAMsupport (AT) blueorbsoft (DOT) comNOSPAM> ÓÏÏÂÝÉÌ/ÓÏÏÂÝÉÌÁ × ÎÏ×ÏÓÔÑÈ ÓÌÅÄÕÀÝÅÅ: news:4042280c$1 (AT) newsgroups (DOT) borland.com... Quote: Yes, that's exactly what I'm doing, but thought there was a way I didn't have to do it manually. Thanks anyway. -- Jon E. Scott Blue Orb Software http://www.blueorbsoft.com "Brian Bushay TeamB" <BBushay (AT) Nmpls (DOT) com> wrote in message news:390440h4q1lk3a80j93klbituttrdci29d (AT) 4ax (DOT) com... Of course, you can name a parameter whatever you want, but for TADOQuery, it must be the master table's fieldname. How else would it know what field to get the value from? Try it out and you'll see what I mean. The SQL passed to ADO can't have parameters of the same name. Borlands ADO components are not going to maintain master/Detail with your SQL. You will need to change the name of one of the parameters then write code for the master tables AfterScroll event to handle setting the detail table parameters and then REQUERY -- Brian Bushay (TeamB) [email]Bbushay (AT) NMPLS (DOT) com[/email] Back to top Vitali Kalinin Guest Posted: Mon Mar 01, 2004 10:55 am    Post subject: Re: TADOQuery - using 2 detail parameters for same master fi Sorry this won't work "Vitali Kalinin" <vitkalinin (AT) yahoo (DOT) com> ÓÏÏÂÝÉÌ/ÓÏÏÂÝÉÌÁ × ÎÏ×ÏÓÔÑÈ ÓÌÅÄÕÀÝÅÅ: news:40430525 (AT) newsgroups (DOT) borland.com... Quote: In this specific case you can adjust yours SQL like this: SELECT * FROM Detail WHERE ((Detail.Field1 LIKE '%' + Detail.Field2 + '%') OR (Detail.Field2 = :PARENTFIELD)) "Jon Scott" <NOSPAMsupport (AT) blueorbsoft (DOT) comNOSPAM> ÓÏÏÂÝÉÌ/ÓÏÏÂÝÉÌÁ × ÎÏ×ÏÓÔÑÈ ÓÌÅÄÕÀÝÅÅ: news:4042280c$1 (AT) newsgroups (DOT) borland.com... Yes, that's exactly what I'm doing, but thought there was a way I didn't have to do it manually. Thanks anyway. -- Jon E. Scott Blue Orb Software http://www.blueorbsoft.com "Brian Bushay TeamB" <BBushay (AT) Nmpls (DOT) com> wrote in message news:390440h4q1lk3a80j93klbituttrdci29d (AT) 4ax (DOT) com... Of course, you can name a parameter whatever you want, but for TADOQuery, it must be the master table's fieldname. How else would it know what field to get the value from? Try it out and you'll see what I mean. The SQL passed to ADO can't have parameters of the same name. Borlands ADO components are not going to maintain master/Detail with your SQL. You will need to change the name of one of the parameters then write code for the master tables AfterScroll event to handle setting the detail table parameters and then REQUERY -- Brian Bushay (TeamB) [email]Bbushay (AT) NMPLS (DOT) com[/email] Back to top Mike Walsh Guest Posted: Wed Mar 03, 2004 1:56 pm    Post subject: Re: TADOQuery - using 2 detail parameters for same master fi "Jon Scott" <NOSPAMsupport (AT) blueorbsoft (DOT) comNOSPAM> wrote Quote: Yes, that's exactly what I'm doing, but thought there was a way I didn't have to do it manually. Thanks anyway. Jon, Several times to other posters, I've mentioned in these groups a method that I use, and noone has ever commented on it. So, I don't know if there's any reason not to use it, but I do and it works (at least against Microsoft SQL Server). What I do is include a variable in my script, then set the var = parameter, then my where clause uses the var instead. For example your query would be declare @ParentField varchar (200) -- or whatever it is set @ParentField = :ParentField SELECT * FROM Detail WHERE ((Detail.Field1 LIKE '%' + @ParentField + '%') OR (Detail.Field2 = :@ParentField)) If any gurus out there see a problem with this approach, I'd love to hear about it. 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