Обсуждение: Getting user created tables from SQL

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Getting user created tables from SQL

От
Cenk KIZILDAG
Дата:
hi guys,
 
i m trying to get the user created tables from SQL by using C++ Builder.Here is the code:
 
TQuery *TableQuery;
        TableQuery= new TQuery (this);
        TQuery *TableCountQuery;
        TableCountQuery= new TQuery (this);
        TableQuery->DatabaseName = "TEMP";
        TableCountQuery->DatabaseName = "TEMP";
 
        TableCountQuery->SQL->Add ("SELECT COUNT(TABLE_NAME) AS CTABLE FROM INFORMATION_SCHEMA.TABLES WHERE (TABLE_TYPE = 'BASE TABLE')");
        TableCountQuery->Open ();
 
        int counttables = TableCountQuery->FieldByName ("CTABLE")->AsInteger;
       
        TableCountQuery->Close ();
        TableCountQuery->Free ();

        TableQuery->SQL->Add ("SELECT TABLE_NAME AS TNAME FROM INFORMATION_SCHEMA.TABLES WHERE (TABLE_TYPE = 'BASE TABLE')");
        TableQuery->Open ();
 
        DynamicArray <AnsiString> CTableArr;
        CTableArr.Length = counttables;
        int f = 0;
        while (!TableQuery->Eof)
        {
                CTableArr[f] = TableQuery->FieldByName ("TNAME")->AsString;
                TableQuery->Next();
                f++;
        }
        TableQuery->Close ();
        TableQuery->Free ();
 
the first Select statement work correct, counttables variable gets the right value but unfortunately, after the second select statement, in C++ Builders SQL Explorer window, it brings the correct number of rows but without datas in them!!! In Enterprise Manager the second select statement also works correct but how come it aint work in C++ builder?
 
i would be grateful if you can help me
 
Thanks
CENK
 


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Re: Getting user created tables from SQL

От
Richard Huxton
Дата:
Cenk KIZILDAG wrote:
> TableQuery->SQL->Add ("SELECT TABLE_NAME AS TNAME FROM
> INFORMATION_SCHEMA.TABLES WHERE (TABLE_TYPE = 'BASE TABLE')");

> CTableArr[f] = TableQuery->FieldByName ("TNAME")->AsString;

> the first Select statement work correct, counttables variable gets
> the right value but unfortunately, after the second select statement,
> in C++ Builders SQL Explorer window, it brings the correct number of
> rows but without datas in them!!! In Enterprise Manager the second
> select statement also works correct but how come it aint work in C++
> builder?

I don't suppose this could be an identifer case issue? In the first 
query TNAME will be case-folded to 'tname' (because that's how PG does 
case-insensitive identifiers).

Try looking up FieldByName("tname") and see if that comes up with anything.

--  Richard Huxton  Archonet Ltd