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cphp/include.mysql.php

143 lines
3.5 KiB
PHTML

13 years ago
<?php
/*
* CPHP is more free software. It is licensed under the WTFPL, which
* allows you to do pretty much anything with it, without having to
* ask permission. Commercial use is allowed, and no attribution is
* required. We do politely request that you share your modifications
* to benefit other developers, but you are under no enforced
* obligation to do so :)
*
* Please read the accompanying LICENSE document for the full WTFPL
* licensing text.
*/
if($_CPHP !== true) { die(); }
$cphp_mysql_connected = false;
class CachedPDO extends PDO
{
public function CachedQuery($query, $parameters = array(), $expiry = 60)
{
/* TODO: Do type guessing before checking cache, so as to avoid
* different parameter hashes depending on input type for
* numbers. */
$query_hash = md5($query);
$parameter_hash = md5(serialize($parameters));
$cache_hash = $query_hash . $parameter_hash;
$return_object = new stdClass;
if($expiry != 0 && $result = mc_get($cache_hash))
{
$return_object->source = "memcache";
$return_object->data = $result;
}
else
{
$statement = $this->prepare($query);
if(count($parameters) > 0)
{
foreach($parameters as $key => $value)
{
$type = $this->GuessType($value);
if(preg_match("/^[0-9]+$/", $value) && $type == PDO::PARAM_STR)
{
/* PDO library apparently thinks it's part of a strongly typed language and doesn't do any typecasting.
* We'll do it ourselves then. */
$value = (int) $value;
$type = PDO::PARAM_INT;
}
if($type == PDO::PARAM_STR)
{
$value = strval($value);
}
$statement->bindValue($key, $value, $type);
}
}
if($statement->execute() === true)
{
if($result = $statement->fetchAll(PDO::FETCH_ASSOC))
{
if(count($result) > 0)
{
if($expiry != 0)
{
mc_set($cache_hash, $result, $expiry);
}
$return_object->source = "database";
$return_object->data = $result;
}
else
{
return false;
}
}
else
{
/* There were zero results. Return null instead of an object without results, to allow for statements
* of the form if($result = $database->CachedQuery()) . */
return null;
}
}
else
{
/* The query failed. */
$err = $statement->errorInfo();
throw new DatabaseException("The query failed: {$err[2]}", 0, null, array('query' => $query, 'parameters' => $parameters));
}
}
return $return_object;
}
public function GuessType($value)
{
if(is_object($value))
{
throw new DatabaseException("Query parameters must be numeric, boolean, null, a string value, or something that can be auto-cast to a string. You provided an object.");
}
if(is_int($value))
{
return PDO::PARAM_INT;
}
elseif(is_bool($value))
{
return PDO::PARAM_BOOL;
}
elseif(is_null($value))
{
return PDO::PARAM_NULL;
}
else
{
return PDO::PARAM_STR;
}
}
}
if(!empty($cphp_config->database->driver))
{
if(empty($cphp_config->database->database))
{
die("No database was configured. Refer to the CPHP manual for instructions.");
}
try
{
$database = new CachedPDO("mysql:host={$cphp_config->database->hostname};dbname={$cphp_config->database->database}", $cphp_config->database->username, $cphp_config->database->password);
$database->setAttribute(PDO::ATTR_ORACLE_NULLS, PDO::NULL_TO_STRING);
$cphp_mysql_connected = true;
}
catch (Exception $e)
{
die("Could not connect to the specified database. Refer to the CPHP manual for instructions.");
}
}