component/swoole/table.php
function column($name, $type, $len = 4)
    {
        parent::column($name, $type, $len);
        return $this;
    }
function column($name, $type, $len = 4)
    {
        parent::column($name, $type, $len);
        return $this;
    }
function column ( $ name , $ type , $ len = 4 ) { parent :: column ( $ name , $ type , $ len ) ; return $ this ; }
增加字段定义
@param     $name
@param     $type
@param int $len
增加字段定义