connection_manager.inc

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<?php
/**************************************************************
 
 Copyright (c) 2007-2010 Sonjara, Inc
 
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 obtaining a copy of this software and associated documentation
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require_once realpath(dirname(__FILE__)."/cache.inc");
 
class ConnectionManager
{
     static $dsn;
     static $user;
     static $password;
     static $conn;
     static $options = null;
     static function getConnection()
     {
          try
          {
               if (!ConnectionManager::$conn)
               {
                    $startTime = microtime(true);
                    ConnectionManager::$conn = new PDO(ConnectionManager::$dsn, ConnectionManager::$user, ConnectionManager::$password, ConnectionManager::$options);
                    ConnectionManager::$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
                    $endTime = microtime(true);
                    trace("Connection opened in ".number_format($endTime-$startTime, 3)." seconds", 3);
                         
               }
               return ConnectionManager::$conn;
          }
          catch(PDOException $e)
          {
               trace("Database connection failed - " . $e->getMessage(), 1);
               throw new DataItemException("Database connection failed - " . $e->getMessage());
          }
     }
     
     static function newConnection()
     {
          try
          {
               $startTime = microtime(true);
               $conn = new PDO(ConnectionManager::$dsn, ConnectionManager::$user, ConnectionManager::$password);
               $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
               $endTime = microtime(true);
               trace("New connection opened in ".number_format($endTime-$startTime, 3)." seconds", 3);
               return $conn;
          }
          catch(PDOException $e)
          {
               trace("Database connection failed - " . $e->getMessage(), 1);
               throw new DataItemException("Database connection failed - " . $e->getMessage());
          }
     }
     
     static function releaseConnection()
     {
          ConnectionManager::$conn = null;
     }
     
     static function quote($str)
     {
          return ConnectionManager::getConnection()->quote($str);
     }
     
     static function escape($str)
     {
          $quoted = ConnectionManager::getConnection()->quote($str);
          $escaped = preg_replace("/^'(.*)'$/", "$1", $quoted);
          trace("ESCAPE: $str -> $quoted -> $escaped", 1);
          return $escaped;
     }
     
     static function getVersion()
     {
          $version = Cache::get("sql_version");
          if (!$version)
          {
               $conn = ConnectionManager::getConnection();
               $version = $conn->query('select version()')->fetchColumn();
               Cache::put("sql_version", $version);
          }
          
          return $version;
     }
}