As described in rfc3261, sip is a layered protocol. Its layers are shown in the image below.Unlike other sophisicated sip libiraies, exosip, pjsip, mjsip, which implement all layers of sip protocol, oSip library doesn't implement transport layer.
現在Linq to sql的資料還不是很多,本人水平有限,如果有錯或者誤導請指出,謝謝。一步一步學Linq to sql(一):預備知識 一步一步學Linq to sql(二):DataContext與實體 一步一步學Linq to sql(三):增刪改 一步一步學Linq to sql(四):查詢句法 一步一步學Linq to sql(五):預存程序 一步一步學Linq to sql(六):探究特性 一步一步學Linq to sql(七):並發與事務 一步一步學Linq to
當使用者在在SQL Server 2008企業管理器中更改表結構時,必須要先刪除原來的表,然後重新建立新表,才能完成表的更改,如果強行更改會出現以下提示:不允許儲存更改。您所做的更改要求刪除並重新建立以下表。您對無法重新建立的標進行了更改或者啟用了“阻止儲存要求重新建立表的更改”選項。如果要去掉此提示,可從“工具”菜單中選擇“選項”,在“選項”對話方塊中,選擇Designers,選擇“資料表設計工具和資料庫設計器”,清除“ 阻止儲存要求重新建立表的更改”複選框。如下:
Question:Give an O(n squared)-time algorithm to find the longest monotonically increasing subsequence of a sequence of n numbers.Answer:A brute-force approach is enumerate all subsequences of the n numbers and find out a monotonically increasing one
If you are a fan of vi editor, you'll be exciting to find out that we can use vi command in shell.By default, bash has its own set of short cut to make it easier to type and change command. But it's quite different from what we vi users have get
Having used consolas font for a period, I felt very comfortable with it. I've used it in putty, vim, visual studio. And I tried to use it in windows console (cmd.exe) by following scott's post, Using Consolas as the Windows Console Font. But
Question:Let X[1 .. n] and Y [1 .. n] be two arrays, each containing n numbers already in sorted order. Give an O(lg n)-time algorithm to find the median of all 2n elements in arrays X and Y.Answer:Without losing generality, suppose the median z is
Question: Suppose that you want to output 0 with probability 1/2 and 1 with probability 1/2. At your disposal is a procedure BIASED-RANDOM, that outputs either 0 or 1. It outputs 1 with some probability p and 0 with probability 1 - p, where 0
I came across a question regarding c++, is it more efficient to use memcmp to determine equality of two objects of the same type.This is not a question regarding efficiency at all, it's about correctness. Using memcmp to compare two objects MAY be