小编Adn*_*ibi的帖子

我是java的新手,我正在尝试制作简单的身份验证界面.

我试图使用DriverManager执行简单查询.你能帮我理解这里的问题吗？

1/MyDBConnection.java

package com.esprit.tunRecrut.util;

    import java.sql.Connection;
    import java.sql.DriverManager;
    import java.sql.SQLException;
    import java.util.logging.Level;
    import java.util.logging.Logger;


        public class MyDBConnection {

            /**
             * Déclaration des variables pour la connexion
             */
            private String url = "jdbc:mysql://localhost:3306/tun_recrut";
            private String login = "root";
            private String pwd = "";
            private static MyDBConnection instance;
            public static Connection connection;

            private MyDBConnection() {
                try {
                    connection = DriverManager.getConnection(url,login,pwd);

                } catch (SQLException ex) {
                    Logger.getLogger(MyDBConnection.class.getName()).log(Level.SEVERE, null, ex);
                }
            }

            public static Connection getConnection() {
                return connection;
            }

            public static MyDBConnection …