private void connect()
{
bool result = true;
if (oracleHandler.IsConnectionUp())
{
oracleHandler.CloseConnection();
int tableNo = specifiers.Count;
for (int i = 0; i < tableNo; ++i)
{
removeSpecifier();
}
}
else
{
oracleHandler.OpenConnection(getDBConnectionSettingsFromGUI());
result = populateSources();
}
if (result)
{
updateControls(oracleHandler.IsConnectionUp()); //the latest status determine...
}
}