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