应用介绍

此项目是学生记录系统。使用的技术有PHP 5.6，MYSQL，HTML，CSS，JAVASCRIPT，JQUERY，AJAX。项目特色有课程创建（添加，编辑和删除）、课程与科目组合（添加，编辑和删除）、学生注册、管理学生（查看，编辑和删除）、登录、注销。本人只展示了一小部分的代码，如想了解详情请点击下方链接下载附件。

<?php
class Database {
 private $_connection;
 private static $_instance; //The single instance
 private $_host = "localhost";
 private $_username = "root";
 private $_password = "";
 private $_database = "schoolmanagement";
 /*
 Get an instance of the Database
 @return Instance
 */
 public static function getInstance() {
  if(!self::$_instance) { // If no instance then make one
   self::$_instance = new self();
  }
  return self::$_instance;
 }
 // Constructor
 public function __construct() {
  $this->_connection = new mysqli($this->_host, $this->_username, $this->_password, $this->_database);
 
  // Error handling
  if(mysqli_connect_error()) {
   trigger_error("Failed to conencto to MySQL: " . mysqli_connect_error(),
     E_USER_ERROR);
  }
 }
 // Magic method clone is empty to prevent duplication of connection
 private function __clone() { }
 // Get mysqli connection
 public function getConnection() {
  return $this->_connection;
 }
}

?>