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<?php
/**
* PDO Cache Handler
* Allows you to store Smarty Cache files into your db.
* Example table :
* CREATE TABLE `smarty_cache` (
* `id` char(40) NOT NULL COMMENT 'sha1 hash',
* `name` varchar(250) NOT NULL,
* `cache_id` varchar(250) DEFAULT NULL,
* `compile_id` varchar(250) DEFAULT NULL,
* `modified` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
* `expire` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',
* `content` mediumblob NOT NULL,
* PRIMARY KEY (`id`),
* KEY `name` (`name`),
* KEY `cache_id` (`cache_id`),
* KEY `compile_id` (`compile_id`),
* KEY `modified` (`modified`),
* KEY `expire` (`expire`)
* ) ENGINE=InnoDB
* Example usage :
* $cnx = new PDO("mysql:host=localhost;dbname=mydb", "username", "password");
* $smarty->setCachingType('pdo');
* $smarty->loadPlugin('Smarty_CacheResource_Pdo');
* $smarty->registerCacheResource('pdo', new Smarty_CacheResource_Pdo($cnx, 'smarty_cache'));
*
* @author Beno!t POLASZEK - 2014
*/
class Smarty_CacheResource_Pdo extends Smarty_CacheResource_Custom
{
protected $fetchStatements = Array('default' => 'SELECT %2$s
FROM %1$s
WHERE 1
AND id = :id
AND cache_id IS NULL
AND compile_id IS NULL',
'withCacheId' => 'SELECT %2$s
FROM %1$s
WHERE 1
AND id = :id
AND cache_id = :cache_id
AND compile_id IS NULL',
'withCompileId' => 'SELECT %2$s
FROM %1$s
WHERE 1
AND id = :id
AND compile_id = :compile_id
AND cache_id IS NULL',
'withCacheIdAndCompileId' => 'SELECT %2$s
FROM %1$s
WHERE 1
AND id = :id
AND cache_id = :cache_id
AND compile_id = :compile_id');
protected $insertStatement = 'INSERT INTO %s
SET id = :id,
name = :name,
cache_id = :cache_id,
compile_id = :compile_id,
modified = CURRENT_TIMESTAMP,
expire = DATE_ADD(CURRENT_TIMESTAMP, INTERVAL :expire SECOND),
content = :content
ON DUPLICATE KEY UPDATE
name = :name,
cache_id = :cache_id,
compile_id = :compile_id,
modified = CURRENT_TIMESTAMP,
expire = DATE_ADD(CURRENT_TIMESTAMP, INTERVAL :expire SECOND),
content = :content';
protected $deleteStatement = 'DELETE FROM %1$s WHERE %2$s';
protected $truncateStatement = 'TRUNCATE TABLE %s';
protected $fetchColumns = 'modified, content';
protected $fetchTimestampColumns = 'modified';
protected $pdo, $table, $database;
/*
* Constructor
*
* @param PDO $pdo PDO : active connection
* @param string $table : table (or view) name
* @param string $database : optionnal - if table is located in another db
*/
public function __construct(PDO $pdo, $table, $database = null)
{
if (is_null($table)) {
throw new SmartyException("Table name for caching can't be null");
}
$this->pdo = $pdo;
$this->table = $table;
$this->database = $database;
$this->fillStatementsWithTableName();
}
/*
* Fills the table name into the statements.
*
* @return Current Instance
* @access protected
*/
protected function fillStatementsWithTableName()
{
foreach ($this->fetchStatements AS &$statement) {
$statement = sprintf($statement, $this->getTableName(), '%s');
}
$this->insertStatement = sprintf($this->insertStatement, $this->getTableName());
$this->deleteStatement = sprintf($this->deleteStatement, $this->getTableName(), '%s');
$this->truncateStatement = sprintf($this->truncateStatement, $this->getTableName());
return $this;
}
/*
* Gets the fetch statement, depending on what you specify
*
* @param string $columns : the column(s) name(s) you want to retrieve from the database
* @param string $id unique cache content identifier
* @param string|null $cache_id cache id
* @param string|null $compile_id compile id
* @access protected
*/
protected function getFetchStatement($columns, $id, $cache_id = null, $compile_id = null)
{
if (!is_null($cache_id) && !is_null($compile_id)) {
$query = $this->fetchStatements[ 'withCacheIdAndCompileId' ] AND
$args = Array('id' => $id, 'cache_id' => $cache_id, 'compile_id' => $compile_id);
} elseif (is_null($cache_id) && !is_null($compile_id)) {
$query = $this->fetchStatements[ 'withCompileId' ] AND
$args = Array('id' => $id, 'compile_id' => $compile_id);
} elseif (!is_null($cache_id) && is_null($compile_id)) {
$query = $this->fetchStatements[ 'withCacheId' ] AND $args = Array('id' => $id, 'cache_id' => $cache_id);
} else {
$query = $this->fetchStatements[ 'default' ] AND $args = Array('id' => $id);
}
$query = sprintf($query, $columns);
$stmt = $this->pdo->prepare($query);
foreach ($args AS $key => $value) {
$stmt->bindValue($key, $value);
}
return $stmt;
}
/**
* fetch cached content and its modification time from data source
*
* @param string $id unique cache content identifier
* @param string $name template name
* @param string|null $cache_id cache id
* @param string|null $compile_id compile id
* @param string $content cached content
* @param integer $mtime cache modification timestamp (epoch)
*
* @return void
* @access protected
*/
protected function fetch($id, $name, $cache_id = null, $compile_id = null, &$content, &$mtime)
{
$stmt = $this->getFetchStatement($this->fetchColumns, $id, $cache_id, $compile_id);
$stmt->execute();
$row = $stmt->fetch();
$stmt->closeCursor();
if ($row) {
$content = $this->outputContent($row[ 'content' ]);
$mtime = strtotime($row[ 'modified' ]);
} else {
$content = null;
$mtime = null;
}
}
/**
* Fetch cached content's modification timestamp from data source
* {@internal implementing this method is optional.
* Only implement it if modification times can be accessed faster than loading the complete cached content.}}
*
* @param string $id unique cache content identifier
* @param string $name template name
* @param string|null $cache_id cache id
* @param string|null $compile_id compile id
*
* @return integer|boolean timestamp (epoch) the template was modified, or false if not found
* @access protected
*/
// protected function fetchTimestamp($id, $name, $cache_id = null, $compile_id = null) {
// $stmt = $this->getFetchStatement($this->fetchTimestampColumns, $id, $cache_id, $compile_id);
// $stmt -> execute();
// $mtime = strtotime($stmt->fetchColumn());
// $stmt -> closeCursor();
// return $mtime;
// }
/**
* Save content to cache
*
* @param string $id unique cache content identifier
* @param string $name template name
* @param string|null $cache_id cache id
* @param string|null $compile_id compile id
* @param integer|null $exp_time seconds till expiration time in seconds or null
* @param string $content content to cache
*
* @return boolean success
* @access protected
*/
protected function save($id, $name, $cache_id = null, $compile_id = null, $exp_time, $content)
{
$stmt = $this->pdo->prepare($this->insertStatement);
$stmt->bindValue('id', $id);
$stmt->bindValue('name', $name);
$stmt->bindValue('cache_id', $cache_id, (is_null($cache_id)) ? PDO::PARAM_NULL : PDO::PARAM_STR);
$stmt->bindValue('compile_id', $compile_id, (is_null($compile_id)) ? PDO::PARAM_NULL : PDO::PARAM_STR);
$stmt->bindValue('expire', (int) $exp_time, PDO::PARAM_INT);
$stmt->bindValue('content', $this->inputContent($content));
$stmt->execute();
return !!$stmt->rowCount();
}
/*
* Encodes the content before saving to database
*
* @param string $content
* @return string $content
* @access protected
*/
protected function inputContent($content)
{
return $content;
}
/*
* Decodes the content before saving to database
*
* @param string $content
* @return string $content
* @access protected
*/
protected function outputContent($content)
{
return $content;
}
/**
* Delete content from cache
*
* @param string|null $name template name
* @param string|null $cache_id cache id
* @param string|null $compile_id compile id
* @param integer|null|-1 $exp_time seconds till expiration or null
*
* @return integer number of deleted caches
* @access protected
*/
protected function delete($name = null, $cache_id = null, $compile_id = null, $exp_time = null)
{
// delete the whole cache
if ($name === null && $cache_id === null && $compile_id === null && $exp_time === null) {
// returning the number of deleted caches would require a second query to count them
$this->pdo->query($this->truncateStatement);
return - 1;
}
// build the filter
$where = array();
// equal test name
if ($name !== null) {
$where[] = 'name = ' . $this->pdo->quote($name);
}
// equal test cache_id and match sub-groups
if ($cache_id !== null) {
$where[] = '(cache_id = ' . $this->pdo->quote($cache_id) . ' OR cache_id LIKE ' .
$this->pdo->quote($cache_id . '|%') . ')';
}
// equal test compile_id
if ($compile_id !== null) {
$where[] = 'compile_id = ' . $this->pdo->quote($compile_id);
}
// for clearing expired caches
if ($exp_time === Smarty::CLEAR_EXPIRED) {
$where[] = 'expire < CURRENT_TIMESTAMP';
} // range test expiration time
elseif ($exp_time !== null) {
$where[] = 'modified < DATE_SUB(NOW(), INTERVAL ' . intval($exp_time) . ' SECOND)';
}
// run delete query
$query = $this->pdo->query(sprintf($this->deleteStatement, join(' AND ', $where)));
return $query->rowCount();
}
/**
* Gets the formatted table name
*
* @return string
* @access protected
*/
protected function getTableName()
{
return (is_null($this->database)) ? "`{$this->table}`" : "`{$this->database}`.`{$this->table}`";
}
}
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