Jtable处理长时间运行的任务

Question

我目前正在使用CardLayout和Netbeans GUI构建器使用JAVA和h2数据库创建桌面应用程序。这个应用程序基本上做CRUD操作，用于保存客户数据，购买和产品列表。

我将数据从数据库加载到JTable中，因此当数据增长时，加载时间开始变慢，应用程序似乎冻结或对用户无响应。经过几天的谷歌搜索，我遇到了SwingWorker，Thread，Runnable和EDT（不知道还有什么）。

我在构造函数中运行以下代码。我认为问题出在这里。

private void updateTable() {
        Vector<Object> columnNames = new Vector<Object>();
        Vector<Object> data = new Vector<Object>();
        Connection conn = new DBConnection().connect();
        try {
            Statement st = conn.createStatement();
            String numOfRow = cboNumberOfRow.getSelectedItem().toString();
            if (numOfRow == "ALL") {
                numOfRow = "-1";
            }
            String query = "select c.custid as \"id\",c.custname as \"Customer Name\",c.custic as \"IC\",c.custphoneno as \"Tel No.\",e.pointearned as \"Point Earned\", e.totalspent as \"Total Spent\" from customer c join expenses e on c.custid = e.custid group by c.custid limit " + numOfRow;

            ResultSet rs = st.executeQuery(query);
            ResultSetMetaData md = rs.getMetaData();
            int columns = md.getColumnCount();

            //  Get column names
            for (int i = 1; i <= columns; i++) {
                columnNames.addElement(md.getColumnLabel(i)); //md.getColumnName will return original table column name instead from the query itself
            }

            //  Get row data
            while (rs.next()) {
                Vector<Object> row = new Vector<Object>(columns);

                for (int i = 1; i <= columns; i++) {
                    row.addElement(rs.getObject(i));
                }

                data.addElement(row);
            }

            rs.close();
            st.close();
            conn.close();
        } catch (SQLException ex) {
            JOptionPane.showMessageDialog(null, ex);
        }

        DefaultTableModel model = new DefaultTableModel(data, columnNames) {
            @Override
            public Class getColumnClass(int column) {
                switch (column) {
                    case 1:
                        return String.class;
                    case 4:
                        return Double.class;
                    case 5:
                        return Double.class;
                    default:
                        return String.class;
                }
            }

            @Override
            public boolean isCellEditable(int row, int col) {
                return false;
            }
        };

        customerTable.setModel(model); //set custom model

    }

希望有人可以指出我的错误，并清楚地了解正确的做法。提前谢谢。