public static function getInstance()
{
if (self::$_instance === null) {
self::$_instance = new self();
}
return self::$_instance;
}
/**
* 开启主从数据库同步时，不同的操作类型将分配不同的服务器进行处理
* @access private
* @param string $type 数据库操作类型 SELECT | ADD |UPDATE | REMOVE
* @return void
*/
protected function _allotDatabaseServer($type = 'SELECT')
{
if ($this->_db_drive_connect == NULL) {
$this->_selectDatabaseServer();
$this->_db_drive_connect = XF_Db_Drive_Mysql::getInstance();
}
if ($this->_open_slave && $type == 'SELECT') {
//if(rand(0, 1) == 0 && $this->_slave_db_count ==1 )
// $this->_db_drive_connect->setDatabaseConnectionConfigInfo($this->_db_config);
//else
$this->_db_drive_connect->setDatabaseConnectionConfigInfo($this->_slave_db_config);
} else {
$this->_db_drive_connect->setDatabaseConnectionConfigInfo($this->_db_config);
}
$this->_db_drive_connect->setDatabaseName($this->_db_table->getDbName());
}