Question

I want to create custom component using swing. Also I want to connect database to that components.

What I want to do,

I want to create a custom JComboBox. That combo box name is warehouse. Also all warehouses in database should be bind to that combo box.

When I design a form I can use that combo box for warehouse. When I run the program all warehouse will be loaded to combo automatically. Because that combo has internal mechanism to load warehouses. (How do I write that thing?)

How do I do that?

Answer 1

I have done a similar thing working with a SQL Database.
Working with a database you need to make use of the ResultSet interface to run your query, and Statement class to create a statement.

public void makeCombo() throws SQLException{
public JComboBox warehouse = new JComboBox();           
try{
            Connection conn = Connect.getConnection();
            String query = "Select ?? FROM ??";
            Statement stmt = conn.createStatement();
            ResultSet rs = stmt.executeQuery(query);
            if (rs!=null){
                while (rs.next()){
                    String name = rs.getString(1);
                    warehouse.addItem(name);
                }

            }
            else{
                System.err.println ("Empty combo");
                warehouse.addItem("Empty Combo");
            }
        }
        catch(Exception e){
            e.printStackTrace();
        }

    }

This should populate the warehouse combo with the results from the query.