docs: private Vector getAllTables() {
  
          Vector result = new Vector(20);
  
          try {
              if (cConn == null) {
                  return null;
              }
  
              dbmeta = cConn.getMetaData();
  
              String[] tableTypes = { "TABLE" };
              ResultSet allTables = dbmeta.getTables(null, null, null,
                                                     tableTypes);
  
              while (allTables.next()) {
                  String aktTable = allTables.getString("TABLE_NAME");
                  ResultSet primKeys = dbmeta.getPrimaryKeys(null, null,
                      aktTable);
  
                  // take only table with a primary key
                  if (primKeys.next()) {
                      result.addElement(aktTable);
                  }
  
                  primKeys.close();
              }
  
              allTables.close();
          } catch (SQLException e) {
  
              // System.out.println("SQL Exception: " + e.getMessage());
          }
  
          return result;
      }