Method RequestData

IO/SQL/vtkSQLDatabaseGraphSource.cxx:241–387

------------------------------------------------------------------------------

//------------------------------------------------------------------------------
int vtkSQLDatabaseGraphSource::RequestData(
  vtkInformation*, vtkInformationVector**, vtkInformationVector* outputVector)
{
  if (this->Implementation->URL.empty())
    return 1;

  if (this->Implementation->EdgeQueryString.empty())
    return 1;

  // Set Progress Text
  this->SetProgressText("DatabaseGraphSource");

  // I've started so 1% progress :)
  this->UpdateProgress(.01);

  // Setup the database if it doesn't already exist ...
  if (!this->Implementation->Database)
  {
    this->Implementation->Database = vtkSQLDatabase::CreateFromURL(this->Implementation->URL);
    if (!this->Implementation->Database)
    {
      vtkErrorMacro(<< "Error creating database using URL: " << this->Implementation->URL);
      return 0;
    }

    if (!this->Implementation->Database->Open(this->Implementation->Password))
    {
      this->Implementation->Database->Delete();
      this->Implementation->Database = 0;

      vtkErrorMacro(<< "Error opening database: " << this->Implementation->URL);
      return 0;
    }
  }

  // I have a database: 5% progress
  this->UpdateProgress(.05);

  // Setup the edge query if it doesn't already exist ...
  if (!this->Implementation->EdgeQuery)
  {
    this->Implementation->EdgeQuery = this->Implementation->Database->GetQueryInstance();
    if (!this->Implementation->EdgeQuery)
    {
      vtkErrorMacro(<< "Internal error creating edge query instance.");
      return 0;
    }
  }

  this->Implementation->EdgeQuery->SetQuery(this->Implementation->EdgeQueryString.c_str());
  if (!this->Implementation->EdgeQuery->Execute())
  {
    vtkErrorMacro(<< "Error executing edge query: " << this->Implementation->EdgeQueryString);
    return 0;
  }

  // Executed edge query: 30% progress
  this->UpdateProgress(.3);