获取JComponent的名称并在PreparedStatement中分配为参数

Question

Okay, so this is what I have so far and it works. However, I'm not able to specify to which ? (or parameter ) the int 1 or 0 ( boolean converted to int ) is set (through setInt() ). I tried using the getName() to see the component variable name but it returns null when I print it.

1. How can I assign a checkbox's value as parameter to my PreparedStatement if I'm not able to specify correctly on which textbox the value of 1 or 0 is from?

   ps.setInt(1,valueOfUnknownCheckbox); //need to put the correct checkbox as 2nd argument.

2. I saw some information about using Java Reflection which I'm totally unfamiliar with. Is there any way without using Java Reflection ?

Some of the checkbox values are not going to the correct database table's column.

I hope you can help with me guys. I wanted to be able to use List to collect components from containers to lessen the lines of codes.

Here's my code.

private void saveAdminPermissions(){
    List<Component> adminPermissionsChbxs = fm.getComponentsAsList(administrationPermissionsCheckBoxPanel);

    Boolean bool = null;

    String updateSQL = 
            "UPDATE allusers_admin_permissions SET CURC_BTN=?, DISCOUNTS_BTN=?, SECTIONS_BTN=?,"
            + " USERS_BTN=?, SCHEDULING_BTN=?, YRLEVELS_BTN=?, ACCTG_BTN=? WHERE USERID=? ";
    try(Connection con = DBUtil.getConnection(DBType.MYSQL);
        PreparedStatement ps = con.prepareStatement(updateSQL);)
    {
        int x=1;
        for(Component c : adminPermissionsChbxs){
            if(c instanceof JCheckBox){
               bool = ( (JCheckBox)c ).isSelected(); 
               JOptionPane.showMessageDialog(null,"Name: "+ ((JCheckBox)c).getName() );
                JOptionPane.showMessageDialog(null,bool);
            } //--end of if
            int boolToInt = (bool)?1:0 ;
            ps.setInt(x, boolToInt);
            x++;
        }//--end of forloop
            ps.setInt(8, um.getIdOfSelected(usersList));
            ps.executeUpdate(); JOptionPane.showMessageDialog(null,"Update successful");
    }catch(SQLException e){
        JOptionPane.showMessageDialog(null,"Error@saveAdminPermissions\n"+ e.getMessage());
    }
}//--end of method

Thanks.

Answer 1

Several approaches are possible:

• Instead of looping though view components, create a permission model having a collection of states such as List<Boolean> . As shown in How to Use Check Boxes , let each JCheckBox have an ItemListener that updates its Boolean value in the List ; an example is seen here . Use the list in constructing your PreparedStatement .

• Alternatively, store the permission description and state in a suitable TableModel , and use a JTable as the view. As described in How to Use Tables: Concepts: Editors and Renderers , the default renderer/editor for a model value of type Boolean is a check box. Neither the renderer nor editor remember the value between calls to render or edit a cell's value, but the table underlying TableModel must do so. Some guidelines and a typical example are cited here . You should be able to invoke the table's getValueAt() method to find the current setting of the desired cell in a particular row and column, as shown here .