* @copyright 2007 (C) by Wrzasq
* @license http://www.gnu.org/licenses/lgpl-3.0.txt GNU Lesser General Public License, Version 3
*/
use MyAAC\Cache\Cache;
/**
* MySQL connection interface.
*
*
* At all everything that you really need to read from this class documentation is list of parameters for driver's constructor.
*
*
* @package POT
* @version 0.1.3
*/
class OTS_DB_MySQL extends OTS_Base_DB
{
private $has_table_cache = array();
private $has_column_cache = array();
private $clearCacheAfter = false;
/**
* Creates database connection.
*
*
* Connects to MySQL database on given arguments.
*
*
*
* List of parameters for this drivers:
*
*
*
* - host - database server.
* - port - port (optional, also it is possible to use host:port in host parameter).
* - database - database name.
* - user - user login.
* - password - user password.
*
*
* @version 0.0.6
* @param array $params Connection parameters.
* @throws PDOException On PDO operation error.
*/
public function __construct($params)
{
$user = null;
$password = null;
$dns = array();
// host:port support
if( strpos(':', $params['host']) !== false)
{
$host = explode(':', $params['host'], 2);
$params['host'] = $host[0];
$params['port'] = $host[1];
}
if( isset($params['database']) )
{
$dns[] = 'dbname=' . $params['database'];
}
if( isset($params['user']) )
{
$user = $params['user'];
}
if( isset($params['password']) )
{
$password = $params['password'];
}
if( isset($params['prefix']) )
{
$this->prefix = $params['prefix'];
}
if( isset($params['log']) && $params['log'] )
{
$this->logged = true;
}
if( !isset($params['persistent']) ) {
$params['persistent'] = false;
}
global $config;
$cache = Cache::getInstance();
if($cache->enabled()) {
$tmp = null;
$need_revalidation = true;
if($cache->fetch('database_checksum', $tmp) && $tmp) {
$tmp = unserialize($tmp);
if(sha1($config['database_host'] . '.' . $config['database_name']) === $tmp) {
$need_revalidation = false;
}
}
if(!$need_revalidation) {
$tmp = null;
if($cache->fetch('database_tables', $tmp) && $tmp) {
$this->has_table_cache = unserialize($tmp);
}
$tmp = null;
if($cache->fetch('database_columns', $tmp) && $tmp) {
$this->has_column_cache = unserialize($tmp);
}
}
}
$driverAttributes = []; // debugbar dont like persistent connection
if (config('env') !== 'dev' && !getBoolean(config('enable_debugbar'))) {
$driverAttributes[PDO::ATTR_PERSISTENT] = $params['persistent'];
}
if(isset($params['socket'][0])) {
$dns[] = 'unix_socket=' . $params['socket'];
parent::__construct('mysql:' . implode(';', $dns), $user, $password, $driverAttributes);
return;
}
if( isset($params['host']) ) {
$dns[] = 'host=' . $params['host'];
}
if( isset($params['port']) ) {
$dns[] = 'port=' . $params['port'];
}
parent::__construct('mysql:' . implode(';', $dns), $user, $password, $driverAttributes);
}
public function __destruct()
{
global $config;
$cache = Cache::getInstance();
if($cache->enabled()) {
if ($this->clearCacheAfter) {
$cache->delete('database_tables');
$cache->delete('database_columns');
$cache->delete('database_checksum');
}
else {
$cache->set('database_tables', serialize($this->has_table_cache), 3600);
$cache->set('database_columns', serialize($this->has_column_cache), 3600);
$cache->set('database_checksum', serialize(sha1($config['database_host'] . '.' . $config['database_name'])), 3600);
}
}
if($this->logged) {
$currentScript = $_SERVER['REQUEST_URI'] ?? $_SERVER['SCRIPT_FILENAME'];
log_append('database.log', $currentScript . PHP_EOL . $this->getLog());
}
}
/**
* Query-quoted field name.
*
* @param string $name Field name.
* @return string Quoted name.
*/
public function fieldName($name)
{
return '`' . $name . '`';
}
/**
* LIMIT/OFFSET clause for queries.
*
* @param int|bool $limit Limit of rows to be affected by query (false if no limit).
* @param int|bool $offset Number of rows to be skipped before applying query effects (false if no offset).
* @return string LIMIT/OFFSET SQL clause for query.
*/
public function limit($limit = false, $offset = false)
{
// by default this is empty part
$sql = '';
if($limit !== false)
{
$sql = ' LIMIT ';
// OFFSET has no effect if there is no LIMIT
if($offset !== false)
{
$sql .= $offset . ', ';
}
$sql .= $limit;
}
return $sql;
}
public function hasTable($name) {
if(isset($this->has_table_cache[$name])) {
return $this->has_table_cache[$name];
}
return $this->hasTableInternal($name);
}
private function hasTableInternal($name) {
global $config;
return ($this->has_table_cache[$name] = $this->query('SELECT `TABLE_NAME` FROM `information_schema`.`tables` WHERE `TABLE_SCHEMA` = ' . $this->quote($config['database_name']) . ' AND `TABLE_NAME` = ' . $this->quote($name) . ' LIMIT 1;')->rowCount() > 0);
}
public function hasColumn($table, $column) {
if(isset($this->has_column_cache[$table . '.' . $column])) {
return $this->has_column_cache[$table . '.' . $column];
}
return $this->hasColumnInternal($table, $column);
}
private function hasColumnInternal($table, $column) {
return $this->hasTable($table) && ($this->has_column_cache[$table . '.' . $column] = count($this->query('SHOW COLUMNS FROM `' . $table . "` LIKE '" . $column . "'")->fetchAll()) > 0);
}
public function revalidateCache() {
foreach($this->has_table_cache as $key => $value) {
$this->hasTableInternal($key);
}
foreach($this->has_column_cache as $key => $value) {
$explode = explode('.', $key);
if(!isset($this->has_table_cache[$explode[0]])) { // first check if table exist
$this->hasTableInternal($explode[0]);
}
if($this->has_table_cache[$explode[0]]) {
$this->hasColumnInternal($explode[0], $explode[1]);
}
}
}
public function setClearCacheAfter($clearCache)
{
$this->clearCacheAfter = $clearCache;
}
}
/**#@-*/
?>