zoukankan      html  css  js  c++  java
  • 单例模式连接数据库

    <?php
    
    class Db {
        static private $_instance;
        static private $_connectSource;
        private $_dbConfig = array(
            'host' => '127.0.0.1',
            'user' => 'root',
            'password' => '',
            'database' => 'video',
        );
    
        private function __construct() {
        }
    
        static public function getInstance() {
            if(!(self::$_instance instanceof self)) {
                self::$_instance = new self();
            }
            return self::$_instance;
        }
    
        public function connect() {
            if(!self::$_connectSource) {
                self::$_connectSource = @mysql_connect($this->_dbConfig['host'], $this->_dbConfig['user'], $this->_dbConfig['password']);    
    
                if(!self::$_connectSource) {
                    throw new Exception('mysql connect error ' . mysql_error());
                    //die('mysql connect error' . mysql_error());
                }
                
                mysql_select_db($this->_dbConfig['database'], self::$_connectSource);
                mysql_query("set names UTF8", self::$_connectSource);
            }
            return self::$_connectSource;
        }
    }
    /*$connect = Db::getInstance()->connect();
    
    $sql = "select * from video";
    $result = mysql_query($sql, $connect);
    echo mysql_num_rows($result);
    var_dump($result);*/
  • 相关阅读:
    redis -- RDB
    redis--数据库
    redis-慢查询日志
    redis 订阅与发布
    redis 事务
    redis 事件
    redis--服务器与客户端
    readis 内部数据结构
    Redis数据类型
    Docker 限制容器资源
  • 原文地址:https://www.cnblogs.com/yangzailu/p/9201011.html
Copyright © 2011-2022 走看看