BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  How to obtain the result of a 'SELECT' SQL query          BorlandTalk.com Forum Index -> C++ Builder Databases (Desktop) View previous topic :: View next topic   Author Message Saurabh Lahoti Guest Posted: Wed Jun 08, 2005 2:07 pm    Post subject: How to obtain the result of a 'SELECT' SQL query I was using a TQuery object to perform a 'SELECT' query, and wanted to know exactly how to access the result set afterwards ? Back to top Don Locke Guest Posted: Wed Jun 08, 2005 3:21 pm    Post subject: Re: How to obtain the result of a 'SELECT' SQL query String sTmp = Query1->FieldByName("SelectedField")->AsString; Works just like a Table. HTH, Don Back to top Saurabh Lahoti Guest Posted: Wed Jun 08, 2005 3:33 pm    Post subject: Re: How to obtain the result of a 'SELECT' SQL query The issue is that I didn't want to return information on just a field. I wanted to return a list of results from a precise SQL query statement. How would I obtain such a list that I could iterate through ? Don Locke <dgnospamlocke (AT) comcast (DOT) net> wrote: Quote: String sTmp = Query1->FieldByName("SelectedField")->AsString; Works just like a Table. HTH, Don Back to top Daniel Mayo Guest Posted: Wed Jun 08, 2005 3:46 pm    Post subject: Re: How to obtain the result of a 'SELECT' SQL query Saurabh Lahoti wrote: Quote: The issue is that I didn't want to return information on just a field. I wanted to return a list of results from a precise SQL query statement. How would I obtain such a list that I could iterate through ? Don Locke <dgnospamlocke (AT) comcast (DOT) net> wrote: String sTmp = Query1->FieldByName("SelectedField")->AsString; Works just like a Table. HTH, Don The same way: int x; Query1->First(); while (x<Query1->RecordCount) { String sTmp = Query1->FieldByName("SelectedField")->AsString; //do something,..look at other fields,.. whatever Query1->Next() } if you want something more basic.. like seeing it all in a stringgrid automatically for ya,.. try associating a TDataSource object to your TQuery then using one of the data controls objects like a TDBGrid and associating that with your TDataSource. voila. (works in design mode too so you can see what you are up to) HTHs Dan Back to top Jayme Jeffman Filho Guest Posted: Wed Jun 08, 2005 6:41 pm    Post subject: Re: How to obtain the result of a 'SELECT' SQL query Hi Lahoti, I am not sure I have understood your question, but, as far as I know, you can not access the result set as a single string. You have to get the value of each field, one by one using Query1->FieldByName("SelectedField")->As.... for each one. The As... property depends on the field type, although you can convert all of them to strings using the AsString property. HTH Jayme. "Saurabh Lahoti" <slahoti (AT) lexmark (DOT) com> escreveu na mensagem news:42a70fcc$1 (AT) newsgroups (DOT) borland.com... Quote: The issue is that I didn't want to return information on just a field. I wanted to return a list of results from a precise SQL query statement. How would I obtain such a list that I could iterate through ? Quote: Don Locke <dgnospamlocke (AT) comcast (DOT) net> wrote: String sTmp = Query1->FieldByName("SelectedField")->AsString; Works just like a Table. HTH, Don Back to top Saurabh Lahoti Guest Posted: Thu Jun 09, 2005 2:48 pm    Post subject: Re: How to obtain the result of a 'SELECT' SQL query What if I had a query statement such as: SELECT max(field_1) FROM table_1 WHERE field_2 = 'name' ....I am just returning a single value that is has no field name. What would I use in the place of the "SelectedField" parameter ? Daniel Mayo <dmayo (AT) reply (DOT) via.newsgroup.com> wrote: Quote: Saurabh Lahoti wrote: The issue is that I didn't want to return information on just a field. I wanted to return a list of results from a precise SQL query statement. How would I obtain such a list that I could iterate through ? Don Locke <dgnospamlocke (AT) comcast (DOT) net> wrote: String sTmp = Query1->FieldByName("SelectedField")->AsString; Works just like a Table. HTH, Don The same way: int x; Query1->First(); while (x<Query1->RecordCount) { String sTmp = Query1->FieldByName("SelectedField")->AsString; //do something,..look at other fields,.. whatever Query1->Next() } if you want something more basic.. like seeing it all in a stringgrid automatically for ya,.. try associating a TDataSource object to your TQuery then using one of the data controls objects like a TDBGrid and associating that with your TDataSource. voila. (works in design mode too so you can see what you are up to) HTHs Dan Back to top Daniel Mayo Guest Posted: Thu Jun 09, 2005 3:27 pm    Post subject: Re: How to obtain the result of a 'SELECT' SQL query Saurabh Lahoti wrote: Quote: What if I had a query statement such as: SELECT max(field_1) FROM table_1 WHERE field_2 = 'name' ...I am just returning a single value that is has no field name. What would I use in the place of the "SelectedField" parameter ? You have to specify a field name parameter (or use an index).. I'd suggest the following: TQuery *dQuery = TQUERYOBJECTNAME; int MaxResult; dQuery->SQL->Text =" SELECT max(field_1) as 'MaxField1'" " FROM table_1" " WHERE field_2 = 'name'"; dQuery->Active = true; MaxResult = dQuery->Fields->FieldByName("MaxField1").AsInteger HTHs Back to top Jayme Jeffman Filho Guest Posted: Fri Jun 10, 2005 3:34 pm    Post subject: Re: How to obtain the result of a 'SELECT' SQL query Hi Lahoti, Have a look in the C++Builder Help file, look for "TDataSet::Fields" and check the example. It has a way of get access to every TQuery field, as long as TTquery is TDataSet descendant. HTH Jayme. "Saurabh Lahoti" <slahoti (AT) lexmark (DOT) com> escreveu na mensagem news:42a856b4$1 (AT) newsgroups (DOT) borland.com... Quote: What if I had a query statement such as: SELECT max(field_1) FROM table_1 WHERE field_2 = 'name' ...I am just returning a single value that is has no field name. What would I use in the place of the "SelectedField" parameter ? Daniel Mayo <dmayo (AT) reply (DOT) via.newsgroup.com> wrote: Saurabh Lahoti wrote: The issue is that I didn't want to return information on just a field. I wanted to return a list of results from a precise SQL query statement. How would I obtain such a list that I could iterate through ? Quote: Don Locke <dgnospamlocke (AT) comcast (DOT) net> wrote: String sTmp = Query1->FieldByName("SelectedField")->AsString; Works just like a Table. HTH, Don The same way: int x; Query1->First(); while (x<Query1->RecordCount) { String sTmp = Query1->FieldByName("SelectedField")->AsString; //do something,..look at other fields,.. whatever Query1->Next() } if you want something more basic.. like seeing it all in a stringgrid automatically for ya,.. try associating a TDataSource object to your TQuery then using one of the data controls objects like a TDBGrid and associating that with your TDataSource. voila. 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