我想显示从数据库到jTable的值

Question

I have a Java program called employeeRecords , which I use to do CRUD operations in a SQL Server database.

I have another program called Table which is a jTable program. I need to display employeeRecords values into my jTable. I know how to display a record in textField but not in jTable columns.

If it matters I'm using Eclipse Mars.

Answer 1

Start by having a look at How to Use Tables

The answer is quite complex, depending on what you want to achieve.

I'd suggest starting by creating a simple POJO to hold the data from the database, personally, this makes the management much easier...

public class Employee {
    // Fields, getters and setters
}

Next, you'll want a TableModel to manage all the instances of Employee ...

public class EmployeeTableModel extends AbstractTableModel {
    private List<Employee> employees;

    public EmployeeTableModel(List<Employee> employees) {
        this.employees = new ArrayList<>(employees);
    }

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

    @Override
    public int getColumnCount() {
        return how ever many fields you want to display;
    }

    @Override
    public String getColumnName(int column) {
        String name = "??";
        switch (column) {
            case 0:
                name = "What every this column represents"
                break;
                .
                .
                .
        }
        return name;
    }

    @Override
    public Object getValueAt(int rowIndex, int columnIndex) {
        Employee employee = employees.get(rowIndex);
        Object value = null;
        switch (columnIndex) {
            case 0:
                value = employee.getXxx();
                break;
                .
                .
                .
        }
        return value;
    }


}

Personally, I find it easier to have a custom table for each POJO, as it allows you manage the individual rows/objects more easily, but that's me

Next, you need to load the data from the database and populate the table model...

public EmployeeTableModel getEmployeeTableModel() throws SQLException {
    Connection con = ...;
    EmployeeTableModel model = null;
    try (PreparedStatement stmt = con.prepareStatement("select * from employeRecords")) {
        try (ResultSet rs = stmt.executeQuery()) {
            List<Employee> employees = new ArrayList<>(25);
            while (rs.next()) {
                Employee employee = new Employee();
                employee.setXxx(rs.getString("Xxx"));
                //...
            }
            model = new EmployeeTableModel(employees);
        }
    }
    return model;
}

Finally, you need to apply the model to a instance of JTableModel

public class SomeUIClass extends JPanel {
    //...
    private JTable table;
    //...

    public void someMethodYouNeedToCallWhenYouWantToReloadTheModel() {
        try {
            table.setModel(getEmployeeTableModel());
        } catch (SQLException ex) {
            ex.printStackTrace();
        }
    }

Answer 2

I don't know if you know how to access the database etc but to print the data to the JTable use this constructor. JTable(Vector rowData, Vector columnNames) Constructs a JTable to display the values in the Vector of Vectors, rowData, with column names, columnNames.

Just remember that the rowData parameter is a Vector of Vectors, with position 0 being the first row under the headings etc.

If this doesn't answet your question please be a little bit more specific and I will see what I can help you with