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07.23.2008 at 10:33AM PDT, ID: 23589418
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9.0

Hyphens in the name entered into DefaultDatabase property cause EOleException in TADOConnection

Asked by SteveBay in Delphi Programming, Delphi Programming Language

Tags: , , ,

When I enter a Database Name in the DefaultDatabase property that contains a hyphen (i.e. My-Database) and then set the ADOConnection.Connected Property=true, I get Property value is invalid. Make sure the value is typed correctly. This is the same behavior you would see if you put in a database name that does not exist on the Server.
While I have found a work-around I would still like to know if anyone else has experienced this and and if so were you able to find the fix?
Test code and work-around shown below:
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procedure TForm1.Button1Click(Sender: TObject);
var i : Integer;
begin
     Memo1.Clear;
     qry.Close;
     ADOConn1.DefaultDatabase := '';
     ADOConn1.Connected := True;
     qry.Connection := ADOConn1;
 
     qry.SQL.Clear;
     qry.SQL.Add('Exec SP_DATABASES');
     try
          qry.Active := True;
          while not qry.Eof do
               begin
               CheckDBName( qry.FieldByName('DATABASE_NAME').AsString );
               qry.Next;
               end;
          qry.Close;
     except
          on e : exception do begin
          ShowMessage('Error getting Databases:' + e.Message);
          end;
     end
 
end;
 
 
function TForm1.CheckDBName(aName : String): Boolean;
begin
     Result := True;
     try
          if chkUseWorkAround.Checked then
               ChangeDefaultDB(ADOConn2, aName) //<< This is my work-around
          else
               ADOConn2.DefaultDatabase := aName; // << This will throw an exception
 
          Memo1.Lines.Add(Format('Good:  %s   %s', [ADOConn2.DefaultDatabase, aName]));
          qry2.Close;
          qry2.SQL.Clear;
          qry2.SQL.Add('EXEC SP_TABLES @table_owner = ''dbo''');
          qry2.Active := True;
          Result := (not qry2.Eof);
          qry2.Active := False;
     except
          on e : exception do begin
               Memo1.Lines.Add(Format('Bad:  %s   %s', [ADOConn2.DefaultDatabase, aName]));
               Memo1.Lines.Add(' Error:' + e.Message);
               result := false;
               end;
     end;
 
end;
 
 
function TForm1.ChangeDefaultDB(aADOConnection : TADOConnection  ; aNewDBName : string) : Boolean;
var s1, s2: string;
     p : integer;
     SaveConnected :  Boolean;
begin
     // Remove Initial Catalog from connection string and
     // replace it with new Database name.
     // Unfortunatly we have to disconnect to do this.
     SaveConnected := aADOConnection.Connected;
     aADOConnection.Connected := False;
     s1 := aADOConnection.ConnectionString;
     p := pos('Initial Catalog=',s1);
     if (p <> 0) and (length(s1) > p + 16) then
          begin
          s1 := copy(s1,1 ,p -1);
          s2 := copy(aADOConnection.ConnectionString,p,length(aADOConnection.ConnectionString));
          p := pos(';',s2);
          if p = 0 then
               aADOConnection.ConnectionString := s1 + ';Initial Catalog=' + aNewDBName
          else begin
               aADOConnection.ConnectionString := s1 + copy(s2,p +1,length(s2)) + ';Initial Catalog=' + aNewDBName;
               end;
          end
     else
          aADOConnection.ConnectionString :=  aADOConnection.ConnectionString + ';Initial Catalog=' + aNewDBName;
 
     Result := True;
     try
          aADOConnection.Connected := SaveConnected;
     except
          Result := False;
     end;
end;
[+][-]07.23.2008 at 12:50PM PDT, ID: 22073114

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About this solution

Zones: Delphi Programming, Delphi Programming Language
Tags: Microsoft / Borland, Delphi 7 / MS SQL, Property value is invalid. Make sure the value is typed correctly, TADOConnection
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Solution Provided By: Geert_Gruwez
Participating Experts: 2
Solution Grade: A
 
 
[+][-]07.23.2008 at 10:48PM PDT, ID: 22076360

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[+][-]07.24.2008 at 06:15AM PDT, ID: 22078730

At Experts Exchange, members can ask their questions to thousands of technology professionals, also known as Experts. Experts compete and collaborate to answer those questions by leaving comments like this one.

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