/**
   * Method declaration
   *
   * @param c
   */
  void connect(Connection c) {

    if (c == null) {
      return;
    }

    if (cConn != null) {
      try {
        cConn.close();
      } catch (SQLException e) {
      }
    }

    cConn = c;

    try {
      dMeta = cConn.getMetaData();
      sStatement = cConn.createStatement();

      refreshTree();
    } catch (SQLException e) {
      e.printStackTrace();
    }
  }
  private void insertRows(Connection connection) {
    // Build the SQL INSERT statement
    String sqlInsert = "insert into " + jtfTableName.getText() + " values (";

    // Use a Scanner to read text from the file
    Scanner input = null;

    // Get file name from the text field
    String filename = jtfFilename.getText().trim();

    try {
      // Create a scanner
      input = new Scanner(new File(filename));

      // Create a statement
      Statement statement = connection.createStatement();

      System.out.println(
          "Driver major version? " + connection.getMetaData().getDriverMajorVersion());

      // Determine if batchUpdatesSupported is supported
      boolean batchUpdatesSupported = false;

      try {
        if (connection.getMetaData().supportsBatchUpdates()) {
          batchUpdatesSupported = true;
          System.out.println("batch updates supported");
        } else {
          System.out.println(
              "The driver is of JDBC 2 type, but " + "does not support batch updates");
        }
      } catch (UnsupportedOperationException ex) {
        System.out.println("The driver does not support JDBC 2");
      }

      // Determine if the driver is capable of batch updates
      if (batchUpdatesSupported) {
        // Read a line and add the insert table command to the batch
        while (input.hasNext()) {
          statement.addBatch(sqlInsert + input.nextLine() + ")");
        }

        statement.executeBatch();

        jlblStatus.setText("Batch updates completed");
      } else {
        // Read a line and execute insert table command
        while (input.hasNext()) {
          statement.executeUpdate(sqlInsert + input.nextLine() + ")");
        }

        jlblStatus.setText("Single row update completed");
      }
    } catch (SQLException ex) {
      System.out.println(ex);
    } catch (FileNotFoundException ex) {
      System.out.println("File not found: " + filename);
    } catch (IOException ex) {
      ex.printStackTrace();
    } finally {
      if (input != null) input.close();
    }
  }