确定db列表的第一行是否已完成- java

import java.sql.*;

public class CheckFirstRowCompletion {
    public static void main(String[] args) {
        // 数据库连接信息
        String url = "jdbc:mysql://localhost:3306/mydatabase";
        String username = "root";
        String password = "password";

        // SQL查询语句
        String sql = "SELECT * FROM db_table";

        try {
            // 连接数据库
            Connection connection = DriverManager.getConnection(url, username, password);

            // 执行查询
            Statement statement = connection.createStatement();
            ResultSet resultSet = statement.executeQuery(sql);

            // 判断第一行是否已完成
            if (resultSet.next()) {
                boolean isFirstRowCompleted = resultSet.getBoolean("is_completed");
                if (isFirstRowCompleted) {
                    System.out.println("第一行已完成");
                } else {
                    System.out.println("第一行未完成");
                }
            } else {
                System.out.println("数据库中没有数据");
            }

            // 关闭连接
            resultSet.close();
            statement.close();
            connection.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}