# 函数原型
public function limit($nOffset = 0, $nCount = 30);
# SELECT `test`.* FROM `test` LIMIT 5,10
Db::table('test')->
limit(5, 10)->
get();
# 函数原型
public function one();
# SELECT `test`.* FROM `test` LIMIT 1
Db::table('test')->
one()->
get();
# 函数原型
public function all();
# SELECT `test`.* FROM `test`
Db::table('test')->
all()->
get();
# 函数原型
public function top($nCount = 30);
# SELECT `test`.* FROM `test` LIMIT 0,15
Db::table('test')->
top(15)->
get();