Question

我在方法中创建了一个OrderModel对象，用于从DB获取值并将其设置为JTable。我想知道如何使用以下代码将此创建的对象设置为JTable：

 tblOrderItems.setModel(DbUtils.resultSetToTableModel());

这是我的代码：

private void tblOrderListMouseClicked(java.awt.event.MouseEvent evt) {                                          
      int raw = tblOrderList.getSelectedRow();
      OrderModel or;
      String item;
      Double qty,amount,total;

      ArrayList<OrderModel> arrOrder = new ArrayList<OrderModel>();

      String selectedRaw = tblOrderList.getModel().getValueAt(raw, 0).toString();
      String sql = "select item,qty,amount from orderdetails where orderid='"+selectedRaw+"'";
      con = new DBconnector().connect();
        try {
            ps = con.prepareStatement(sql);
            ResultSet rs = ps.executeQuery();
            if(rs.next()){
                or = new OrderModel();
                or.setItem(rs.getString("item"));
                or.setQty(rs.getDouble("qty"));
                or.setAmount(rs.getDouble("amount"));
                arrOrder.add(or);

            DefaultTableModel tblModel = new DefaultTableModel();
          // wanted to set ArrayList to table+              
            tblOrderItems.setModel(DbUtils.resultSetToTableModel());

            }


        } catch (Exception e) {
            e.printStackTrace();
        }

    }

Answer 1

首先创建一个自己的zip -d file.jar 'META-INF/*.SF' 'META-INF/*.RSA'，它可以管理您的TableModel类，它代表表格中的一行......

OrderModel

然后你就可以使用......

public static class OrderTableModel extends AbstractTableModel {

    protected static final String[] COLUMN_NAMES = {"Item", "Qty", "Amount"};
    private List<OrderModel> rows;

    public OrderTableModel(List<OrderModel> rows) {
        this.rows = new ArrayList<>(rows);
    }

    @Override
    public int getRowCount() {
        return rows.size();
    }

    @Override
    public int getColumnCount() {
        return COLUMN_NAMES.length;
    }

    @Override
    public String getColumnName(int column) {
        return COLUMN_NAMES[column];
    }

    @Override
    public Object getValueAt(int rowIndex, int columnIndex) {
        Object value = null;
        OrderModel row = rows.get(rowIndex);
        switch (columnIndex) {
            case 0:
                value = row.getItem();
                break;
            case 1:
                value = row.getQty();
                break;
            case 2:
                value = row.getAmount();
                break;
        }
        return value;
    }

}

只需加载private void tblOrderListMouseClicked(java.awt.event.MouseEvent evt) { int raw = tblOrderList.getSelectedRow(); OrderModel or; String item; Double qty, amount, total; ArrayList<OrderModel> arrOrder = new ArrayList<OrderModel>(); String selectedRaw = tblOrderList.getModel().getValueAt(raw, 0).toString(); String sql = "select item,qty,amount from orderdetails where orderid=?"; con = new DBconnector().connect(); try (PreparedStatement ps = con.prepareStatement(sql)) { ps.setString(1, selectedRaw); try (ResultSet rs = ps.executeQuery()) { while (rs.next()) { or = new OrderModel(); or.setItem(rs.getString("item")); or.setQty(rs.getDouble("qty")); or.setAmount(rs.getDouble("amount")); arrOrder.add(or); } OrderTableModel model = new OrderTableModel(arrOrder); tblOrderItems.setModel(model); } } catch (SQLException e) { e.printStackTrace(); } }中的项目，然后将其传递到ArrayList的实例，然后应用于OrderTableModel

有关使用自定义模型的详细信息，请查看How to Use Tables。

有关如何使用JTable的详细信息，请查看Using Prepared Statements

有关如何更好地管理数据库（和其他）资源的更多详细信息，请查看The try-with-resources Statement

如何使用OOP概念将arraylist对象设置为表

1 个答案: