增加，删除，修改，查看。操作

<?php

class Hubby

{

public function delete()

{

$num = Db::table('staff')->delete(19);

$num = Db::table('staff')->delete([12,13,17]);

$num = Db::table('staff')

->where('salary','>','10000')

->delete();

$num = Db::table('staff')->delete(true);

return $num ? '删除成功' .$num. '条记录~~'

}

}