从两个不同的mysql数据填充jcombobox

import java.sql.*;

public class ComboBoxExample {
    public static void main(String[] args) {
        try {
            // 连接到第一个MySQL数据库
            Connection conn1 = DriverManager.getConnection("jdbc:mysql://localhost/db1", "username1", "password1");
            Statement stmt1 = conn1.createStatement();
            
            // 查询数据
            ResultSet rs1 = stmt1.executeQuery("SELECT column1 FROM table1");
            
            // 连接到第二个MySQL数据库
            Connection conn2 = DriverManager.getConnection("jdbc:mysql://localhost/db2", "username2", "password2");
            Statement stmt2 = conn2.createStatement();
            
            // 查询数据
            ResultSet rs2 = stmt2.executeQuery("SELECT column1 FROM table2");
            
            // 填充JComboBox
            JComboBox<String> comboBox = new JComboBox<>();
            
            // 处理第一个查询结果
            while (rs1.next()) {
                String data = rs1.getString("column1");
                comboBox.addItem(data);
            }
            
            // 处理第二个查询结果
            while (rs2.next()) {
                String data = rs2.getString("column1");
                comboBox.addItem(data);
            }
            
            // 关闭数据库连接和结果集
            rs1.close();
            stmt1.close();
            conn1.close();
            rs2.close();
            stmt2.close();
            conn2.close();
            
            // 在界面上显示JComboBox
            // ...
            
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}