Question

如果我的帖子错了，我的道歉，我的第一个。

我有一个带有mysql后端的多用户应用程序。所有与用户相关的例程（包括会话跟踪）都依赖于mysql表。我看到的问题是数据库连接偶尔会消失。例如，在导航站点时检查用户会话时，不会从DB返回任何内容，因此用户将被注销（应用程序旨在执行此操作）。所有php类都使用相同的Database类，它提供PDO例程，即db = new Database();。从我收集的内容来看，我需要在Database类中包含克隆和实例检查，但我不太清楚如何实现它。

非常感谢任何帮助。

<?php
class Database{

    private $host;     
    private $user;     
    private $pass;     
    private $dbname;   
    private $dbh;
    private $error;

    public function __construct(){

        require('config file');

        $this->host = host
        $this->user = user
        $this->pass = password
        $this->dbname = dbname
        // Set DSN
            $dsn = 'mysql:host=' . $this->host . ';port=3306'.';dbname=' . $this->dbname;
        // Set options
            $options = array(
                PDO::ATTR_PERSISTENT    => true,
        PDO::MYSQL_ATTR_USE_BUFFERED_QUERY => TRUE,
        PDO::ATTR_EMULATE_PREPARES => TRUE,
                PDO::ATTR_ERRMODE       => PDO::ERRMODE_EXCEPTION
            );
        // Create a new PDO instanace
            try{
                    $this->dbh = new PDO($dsn, $this->user, $this->pass, $options);
                }
        // Catch any errors
            catch(PDOException $e){
            error_log(__CLASS__.'::'.$e);
                    $this->error = $e->getMessage();
                }
            }

    public function query($query){
        $this->stmt = $this->dbh->prepare($query);
        }


    public function bind($param, $value, $type = null){
        if (is_null($type)) {
            switch (true) {
                case is_int($value):
                    $type = PDO::PARAM_INT;
                    break;
                case is_bool($value):
                    $type = PDO::PARAM_BOOL;
                     break;
                case is_null($value):
                    $type = PDO::PARAM_NULL;
                    break;
                default:
                    $type = PDO::PARAM_STR;
                }           
            }
        $this->stmt->bindValue($param, $value, $type);
        }


    public function execute(){
        try{
            return $this->stmt->execute();
            }
        catch(PDOException $e){
                        error_log(__CLASS__.'::'.$e);
            }
        }

    public function resultset(){
        $this->execute();
        return $this->stmt->fetchAll(PDO::FETCH_ASSOC);
        }

    public function single(){
        $this->execute();
        return $this->stmt->fetch(PDO::FETCH_ASSOC);
        }

    public function rowCount(){
        return $this->stmt->rowCount();
        }

    public function lastInsertId(){
        return $this->dbh->lastInsertId();
        }

    public function beginTransaction(){
        return $this->dbh->beginTransaction();
        }

    public function endTransaction(){
        return $this->dbh->commit();
        }

    public function cancelTransaction(){
        return $this->dbh->rollBack();
        }

    public function debugDumpParams(){
        return $this->stmt->debugDumpParams();
        }

    public function close(){
        $this->dbh  = null;
        return 1;
        }

    }
?>

PHP PDO多实例类

0 个答案: