diff options
Diffstat (limited to 'system/database/DB_driver.php')
| -rw-r--r-- | system/database/DB_driver.php | 213 |
1 files changed, 125 insertions, 88 deletions
diff --git a/system/database/DB_driver.php b/system/database/DB_driver.php index 811f09093..a7a89a953 100644 --- a/system/database/DB_driver.php +++ b/system/database/DB_driver.php @@ -156,7 +156,7 @@ class CI_DB_driver { // Is there a cache direcotry specified in the config file? if ($this->cachedir != '') { - $this->cache_set_dir($this->cachedir); + $this->cache_set_path($this->cachedir); } } @@ -221,7 +221,7 @@ class CI_DB_driver { * @return mixed */ function query($sql, $binds = FALSE, $return_object = TRUE) - { + { if ($sql == '') { if ($this->db_debug) @@ -235,7 +235,7 @@ class CI_DB_driver { // Is query caching enabled? If the query is a "read type" we will // grab the previously cached query if it exists and return it. if ($this->cache_on == TRUE AND stristr($sql, 'SELECT')) - { + { if (FALSE !== ($cache = $this->cache_read($sql))) { return $cache; @@ -285,7 +285,15 @@ class CI_DB_driver { // Was the query a "write" type? // If so we'll simply return true if ($this->is_write_type($sql) === TRUE) - { + { + // If caching is enabled we'll auto-cleanup any + // existing files related to this particular URI + + if ($this->cache_on == TRUE) + { + $this->cache_delete(); + } + return TRUE; } @@ -296,19 +304,12 @@ class CI_DB_driver { { return TRUE; } - - // Define the result driver name - $result = 'CI_DB_'.$this->dbdriver.'_result'; - - // Load the result classes - if ( ! class_exists($result)) - { - include_once(BASEPATH.'database/DB_result'.EXT); - include_once(BASEPATH.'database/drivers/'.$this->dbdriver.'/'.$this->dbdriver.'_result'.EXT); - } + + // Load and instantiate the result driver - // Instantiate the result object - $RES = new $result(); + $driver = $this->load_rdriver(); + + $RES = new $driver(); $RES->conn_id = $this->conn_id; $RES->db_debug = $this->db_debug; $RES->result_id = $this->result_id; @@ -319,9 +320,37 @@ class CI_DB_driver { $RES->curs_id = NULL; $RES->limit_used = $this->limit_used; } - + + // Is query caching enabled? If so, we'll serialize the + // result object and save it to a cache file + if ($this->cache_on == TRUE) + { + $this->cache_write($sql, $RES); + } + return $RES; } + + // -------------------------------------------------------------------- + + /** + * Load the result drivers + * + * @access public + * @return string the name of the result class + */ + function load_rdriver() + { + $driver = 'CI_DB_'.$this->dbdriver.'_result'; + + if ( ! class_exists($driver)) + { + include_once(BASEPATH.'database/DB_result'.EXT); + include_once(BASEPATH.'database/drivers/'.$this->dbdriver.'/'.$this->dbdriver.'_result'.EXT); + } + + return $driver; + } // -------------------------------------------------------------------- @@ -859,7 +888,7 @@ class CI_DB_driver { */ function cache_on() { - $this->query_caching = TRUE; + return $this->query_caching = TRUE; } // -------------------------------------------------------------------- @@ -872,7 +901,7 @@ class CI_DB_driver { */ function cache_off() { - $this->query_caching = FALSE; + return $this->query_caching = FALSE; } // -------------------------------------------------------------------- @@ -882,10 +911,15 @@ class CI_DB_driver { * * @access public * @param string the path to the cache directory - * @return void + * @return bool */ - function cache_set_dir($path = '') + function cache_set_path($path = '') { + if ($path == '') + { + return $this->cache_off(); + } + // Add a trailing slash to the path if needed $path = preg_replace("/(.+?)\/*$/", "\\1/", $path); @@ -896,33 +930,12 @@ class CI_DB_driver { return $this->display_error('db_invalid_cache_path'); } - $this->enable_caching(FALSE); - return FALSE; + // If the path is wrong we'll turn off caching + return $this->cache_off(); } $this->cache_dir = $path; - } - - // -------------------------------------------------------------------- - - /** - * Set Cache Path - * - * @access public - * @param string the path to the cache directory - * @return void - */ - function cache_set_path($sql) - { - $obj =& get_instance(); - - // The URI being requested will become the name of the cache sub-folder - - $uri = ($obj->uri->uri_string() == '') ? 'index' : $obj->uri->uri_string(); - - // Convert the SQL query into a hash. This will become the cache file name. - - return md5($uri).'/'.md5($sql); + return TRUE; } // -------------------------------------------------------------------- @@ -930,31 +943,27 @@ class CI_DB_driver { /** * Retreive a cached query * + * The URI being requested will become the name of the cache sub-folder. + * An MD5 hash of the SQL statement will become the cache file name + * * @access public * @return string */ function cache_read($sql) - { - if ( ! @is_dir($this->cache_dir)) + { + if ( ! $this->cache_set_path($this->cache_dir)) { - return $this->cache_on = FALSE; + return $this->cache_off(); } - $filepath = $this->cache_set_path($sql); - - if ( ! @file_exists($this->cache_dir.$filepath)) - { - return FALSE; - } + $obj =& get_instance(); + $uri = ($obj->uri->segment(1) == FALSE) ? 'base' : $obj->uri->segment(2); + $uri .= ($obj->uri->segment(2) == FALSE) ? 'index' : $obj->uri->segment(2); - if ( ! $fp = @fopen($this->cache_dir.$filepath, 'rb')) - { - return FALSE; - } - - $cachedata = file_get_contents($this->cache_dir.$filepath); + $filepath = md5($uri).'/'.md5($sql); - if ( ! is_string($cachedata)) + $obj->load->helper('file'); + if (FALSE === ($cachedata = read_file($this->cache_dir.$filepath))) { return FALSE; } @@ -972,46 +981,74 @@ class CI_DB_driver { */ function cache_write($sql, $object) { - if ( ! @is_dir($this->cache_dir)) + if ( ! $this->cache_set_path($this->cache_dir)) { - return $this->cache_on = FALSE; + return $this->cache_off(); } - - $filepath = $this->cache_set_path($sql); - - - + + $obj =& get_instance(); + $uri = ($obj->uri->segment(1) == FALSE) ? 'base' : $obj->uri->segment(2); + $uri .= ($obj->uri->segment(2) == FALSE) ? 'index' : $obj->uri->segment(2); - - - $dirs = array(PATH_CACHE.'db_cache', substr($this->cache_dir, 0, -1)); + $dir_path = $this->cache_dir.md5($uri).'/'; - foreach ($dirs as $dir) - { - if ( ! @is_dir($dir)) + $filename = md5($sql); + + if ( ! @is_dir($dir_path)) + { + if ( ! @mkdir($dir_path, 0777)) { - if ( ! @mkdir($dir, 0777)) - { - return; - } - - @chmod($dir, 0777); + return FALSE; } + + @chmod($dir_path, 0777); } - - if ( ! $fp = @fopen($this->cache_dir.$this->cache_file, 'wb')) + + $obj->load->helper('file'); + if (write_file($dir_path.$filename, serialize($object)) === FALSE) { return FALSE; } - flock($fp, LOCK_EX); - fwrite($fp, $object); - flock($fp, LOCK_UN); - fclose($fp); + @chmod($dir_path.$filename, 0777); + return TRUE; + } + + // -------------------------------------------------------------------- + + /** + * Delete cache files within a particular directory + * + * @access public + * @return bool + */ + function cache_delete() + { + $obj =& get_instance(); + $uri = ($obj->uri->segment(1) == FALSE) ? 'base' : $obj->uri->segment(2); + $uri .= ($obj->uri->segment(2) == FALSE) ? 'index' : $obj->uri->segment(2); + + $dir_path = $this->cache_dir.md5($uri).'/'; - @chmod($this->cache_dir.$this->cache_file, 0777); + $obj->load->helper('file'); + delete_files($dir_path, TRUE); + } - return TRUE; + // -------------------------------------------------------------------- + + /** + * Delete all existing cache files + * + * @access public + * @return bool + */ + // -------------------------------------------------------------------- + + function cache_delete_all() + { + $obj =& get_instance(); + $obj->load->helper('file'); + delete_files($this->cache_dir, TRUE); } // -------------------------------------------------------------------- |