public function getCacheVer($table)
{
if (!$this->openCache) {
return '';
}
$version = Model::getInstance()->cache()->get($this->conf['mark'] . '_db_cache_version_' . $table);
if (!$version) {
$version = microtime(true);
Model::getInstance()->cache()->set($this->conf['mark'] . '_db_cache_version_' . $table, $version, $this->conf['cache_expire']);
}
return $version;
}