java swing jtable在单个表中从数据库中添加两个表

时间：2017-11-16 06:51:34

标签： java mysql swing jtable

我有一个名为tbl_income和tbl_expenses的表... tbl_income包含四列和四行，tbl_expenses包含下图中的四列和三行链接。

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我想在下面的java swing JTable链接图中mank单表。

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我怎么能这样做......抱歉英语不好..

这就是我尝试过的：

go build

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tblincome有单行但行回复

2 个答案:

答案 0 :(得分：2)

select * from income left join expenses on income.id = expenses.id

然后我使用+----+------------+----------------+--------+----+------------+------------+--------+--+ | id | dateValue | particular | amount | id | dateValue | particular | amount | | +----+------------+----------------+--------+----+------------+------------+--------+--+ | 1 | 2017-02-02 | Cash Deposit | 1 | 1 | 2017-05-07 | Factory | 6 | | | 2 | 2017-02-03 | Cheque Deposit | 2 | 2 | 2017-06-02 | Staff | 7 | | | 3 | 2017-02-08 | Cash Deposit | 3 | 3 | 2017-06-03 | Travel | 8 | | | 4 | 2017-02-07 | Product Sales | 4 | | | | | | +----+------------+----------------+--------+----+------------+------------+--------+--+ 查询数据库并得到：

JTable

基于当前可用的信息可能是我能做的最好的

您可以使用Most simple code to populate JTable from ResultSet或Retrieving Data from JDBC Database into Jtable之类的内容来构建full outer join ...作为可用示例

  

如果第二个表有比第一个表更多的行..记录将不会显示哪个是第二个表中更多的id - raman dangol 8小时前

     

此外，如果ID不一致，记录将丢失。这就是为什么我说这不是一个微不足道的问题

然后在这些情况下，像FULL OUTER JOIN这样的东西会更有用。但是，根据我的信息，MySQL不支持select * from income left join expenses on income.id = expenses.id union select * from income right join expenses on income.id = expenses.id where income.id is null，因为这会很有用。但是，基于How to do a FULL OUTER JOIN in MySQL?我们可以做类似的事情......

+----+------------+----------------+--------+----+------------+------------+--------+ | id | datevalue | particular | amount | id | datevalue | particular | amount | +----+------------+----------------+--------+----+------------+------------+--------+ | 1 | 2017-02-02 | Cash Deposit | 1.0 | 1 | 2017-05-07 | Factory | 6.0 | | 2 | 2017-02-03 | Cheque Deposit | 2.0 | 2 | 2017-06-02 | Staff | 7.0 | | 3 | 2017-02-03 | Cash Deposit | 3.0 | 3 | 2017-06-03 | Travel | 8.0 | | 4 | 2017-02-03 | Product Sales | 4.0 | 4 | 2017-10-01 | Test 1 | 10.0 | | 5 | 2017-10-02 | Test 2 | 20.0 | | | | | +----+------------+----------------+--------+----+------------+------------+--------+

可以生成像

这样的东西 
select income.id, income.datevalue, income.PARTICULAR, income.AMOUNT, 
       expenses.id, expenses.datevalue, expenses.PARTICULAR, expenses.AMOUNT 
       from income join expenses on income.id = expenses.id
union all
select income.id, income.datevalue, income.PARTICULAR, income.AMOUNT, 
       null, null, null, null 
       from INCOME where not exists (select expenses.id from expenses where expenses.id = income.id)
union all
select null, null, null, null, 
       expenses.id, expenses.datevalue, expenses.PARTICULAR, expenses.AMOUNT 
       from expenses where not exists (select income.id from income where income.id = expenses.id)

或者，如果您希望将事物与“选定的一方”保持一致，例如

+----+------------+----------------+--------+----+------------+------------+--------+
| id | datevalue  |   particular   | amount | id | datevalue  | particular | amount |
+----+------------+----------------+--------+----+------------+------------+--------+
|  1 | 2017-02-02 | Cash Deposit   |    1.0 |  1 | 2017-05-07 | Factory    |    6.0 |
|  2 | 2017-02-03 | Cheque Deposit |    2.0 |  2 | 2017-06-02 | Staff      |    7.0 |
|  3 | 2017-02-03 | Cash Deposit   |    3.0 |  3 | 2017-06-03 | Travel     |    8.0 |
|  4 | 2017-02-03 | Product Sales  |    4.0 |  4 | 2017-10-01 | Test 1     |   10.0 |
|    |            |                |        |  5 | 2017-10-02 | Test 2     |   20.0 |
+----+------------+----------------+--------+----+------------+------------+--------+

可以产生类似......

的东西 
views

在一天结束时，它仍然是一个数据库问题。

为简单起见，您可以创建一个或多个数据库... String s = generateString(); Log.d(TAG, "result is : " + s); ... ，以便简单地查询

答案 1 :(得分：1)

这是一个解决方案，可以单独提取两个表并将它们集成到一个公共TableModel中。

public class MyTableModel extends AbstractTableModel implements TableModel {
    private List<Data> inclomeList;
    private List<Data> expenseList;

    private void setData(List<Data> list, Data data) {
        int rows = getRowCount();
        int row = list.size();
        list.add(data);

        if(row < rows) {
            fireTableRowsUpdated(row, row);
        }
        else {
            fireTableRowsInserted(row, row);
        }
    }

    public void setIncomeData(Data data) {
        if(inclomeList == null) {
            inclomeList = new ArrayList<>();
        }

        setData(inclomeList, data);
    }

    public void setExpenseData(Data data) {
        if(expenseList == null) {
            expenseList = new ArrayList<>();
        }

        setData(expenseList, data);
    }

    @Override
    public String getColumnName(int column) {
        switch (column) {
            case 0:
            case 3:
                return "Date";

            case 1: return "Income";
            case 4: return "Expenses";


            case 2:
            case 5:
                return "Amount";

            default:
                return super.getColumnName(column);
        }
    }

    @Override
    public int getRowCount() {
        if(inclomeList == null || expenseList == null) {
            if(inclomeList != null) {
                return inclomeList.size();
            }
            else if(expenseList != null) {
                return expenseList.size();
            }

            return 0;
        }

        return Math.max(inclomeList.size(), expenseList.size());
    }

    @Override
    public int getColumnCount() {
        return 6;
    }

    @Override
    public Object getValueAt(int row, int column) {
        Data inclome = null;
        Data expense = null;

        if(inclomeList != null && inclomeList.size() > row) {
            inclome = inclomeList.get(row);
        }

        if(expenseList != null && expenseList.size() > row) {
            expense = expenseList.get(row);
        }

        switch (column) {
            case 0: return inclome != null ? inclome.getDate() : "";
            case 1: return inclome != null ? inclome.getName() : "";
            case 2: return inclome != null ? inclome.getAmount() : "";
            case 3: return expense != null ? expense.getDate() : "";
            case 4: return expense != null ? expense.getName() : "";
            case 5: return expense != null ? expense.getAmount() : "";
        }

        return null;
    }

    public void update() {
        SwingWorker<Void, Void> worker = new SwingWorker<Void, Void>() {
            @Override
            protected Void doInBackground() throws Exception {
                Database database = new Database();
                inclomeList = database.getData(Database.TBL_INCOME);
                expenseList = database.getData(Database.TBL_EXPENSES);

                return null;
            }

            @Override
            protected void done() {
                try {
                    get();
                    fireTableDataChanged();
                }
                catch (InterruptedException | ExecutionException e) {
                    e.printStackTrace();
                }
            }
        };

        worker.execute();
    }
}

使用数据库的界面：

public class Database {
    public static final String TBL_INCOME = "tbl_income";
    public static final String TBL_EXPENSES = "tbl_expenses";

    private Connection getConnection() throws SQLException {
        return DriverManager.getConnection("jdbc:mysql://192.168.40.5/test", "root", "");
    }

    public List<Data> getData(String tbl_name) throws SQLException {
        try (Connection connection = getConnection()) {
            String query = "select * from " + tbl_name;

            try(ResultSet rs = connection.createStatement().executeQuery(query)) {
                List<Data> list = new ArrayList<>();
                while (rs.next()) {
                    Data data = new Data();
                    data.setDate(rs.getDate("date"));
                    data.setName(rs.getString("particular"));
                    data.setAmount(rs.getDouble("amount"));

                    list.add(data);
                }

                return list;
            }
        }
    }
}

MainFrame.java 

public class MainFrame extends JFrame {

    private JTable table = new JTable(new MyTableModel());

    public MainFrame() throws HeadlessException {
        super("MainFrame");
        createGUI();
    }

    private void createGUI() {
        setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
        setPreferredSize(new Dimension(600, 400));

        JButton addI = new JButton("+");
        addI.addActionListener(e -> ((MyTableModel)table.getModel()).setIncomeData(new Data()));

        JButton addE = new JButton("+");
        addE.addActionListener(e -> ((MyTableModel)table.getModel()).setExpenseData(new Data()));

        JPanel panel = new JPanel(new FlowLayout(FlowLayout.RIGHT, 5, 0));
        panel.add(addI);
        panel.add(addE);

        JScrollPane scrollPane = new JScrollPane(table);
        add(scrollPane, BorderLayout.CENTER);
        add(panel, BorderLayout.PAGE_END);

        pack();
        setLocationRelativeTo(null);

        ((MyTableModel)table.getModel()).update();
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(() -> new MainFrame().setVisible(true));
    }
}

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