/**
* 单行查询
* @param null $_field
* @return mixed
*/
protected function find($_field = null)
{
$this->joint_field($_field);
$this->_db->_sql = 'SELECT ' . $this->mergeSqlLogic() . ';';
$this->clear_where();
return $this->_db->find();
}
/**
* Returns the first occurance of an item with a given id
*
* @param string $id The item id
* @return Item Item object
*/
public function find($id)
{
return $this->store->find($id);
}
/**
* 单行查询
* @param null $_field
* @return mixed
*/
public function find($_field = null)
{
return $this->_db->find(' SELECT ' . $this->lodeField($_field) . $this->mergeSql());
}