2007-08-08 11:44 A.M.
.NET Framework拦截机制的设计中，在客户端和对象之间，存在着多种消息接收器，这些消息接收器组成一个链表，客户端的调用对象的过程以及调用返回实行拦截，你可以定制自己的消息接收器，把它们插入了到链表中，来完成你对一个调用的前处理和后处理。那么调用拦截是如何构架或者说如何实现的呢？
在.NET中有两种调用，一种是跨应用域（App Domain)，一种是跨上下文环境（Context)，两种调用均通过中间的代理（proxy)，代理被分为两个部分：透明代理和实际代理。透明代理暴露同对象一样的公共入口点，当客 |
2007-08-08 11:17 A.M.
| Api函数是构筑Windws应用程序的基石，每一种Windows应用程序开发工具，它提供的底层函数都间接或直接地调用了Windows API函数，同时为了实现功能扩展，一般也都提供了调用WindowsAPI函数的接口， 也就是说具备调用动态连接库的能力。Visual C#和其它开发工具一样也能够调用动态链接库的API函数。.NET框架本身提供了这样一种服务,允许受管辖的代码调用动态链接库中实现的非受管辖函数,包括操作系统提供的Windows API函数。它能够定位和调用输出函数,根据需 | |
2007-08-07 01:31 P.M.
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2007-08-07 01:27 P.M.
2007-08-07 12:35 P.M.
ContextAttribute派生自Attribute,同时它还实现了IContextAttribute和IContextProperty接口。所有自定义的ContextAttribute必须从这个类派生。
构造器：
ContextAttribute:构造器带有一个参数，用来设置ContextAttribute的名称。
公共属性：
Name:只读属性。返回ContextAttribute的名称
公共方法：
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2007-05-26 10:52 A.M.
2007-05-23 05:14 P.M.
2007-05-23 04:11 P.M.
To reproduce the above problem, use the following commands:
sp_addlogin 'dSQLuser'
GO
sp_defaultdb 'dSQLuser', 'pubs'
USE pubs
GO
sp_adduser 'dSQLUser', 'dSQLUser'
GO
CREATE PROC dSQLProc
AS
BEGIN
SELECT * FROM titles WHERE title_id = 'BU1032' --This works
DECLARE @str CHAR(100)
SET @str = 'SELECT * FROM titles WHERE |
2007-05-23 04:10 P.M.
by Vyas Kondreddi
Databases are the heart and soul of many enterprise applications, and it is very essential to pay special attention to database programming. I've seen in many occasions where database programming is overlooked, thinking that it's something easy that be done by anyone. This is wrong. |
2007-05-23 04:05 P.M.
Introduction
In this article, I want to tell you about SQL Server 7.0/2000 Transaction Isolation Levels, what kinds of Transaction Isolation Levels exist, and how you can set the appropriate Transaction Isolation Level, about Lock types and Locking optimizer hints, about deadlocks, and about how you can view locks by using the sp_lock stored procedure.
Transaction Isolation Levels
There are four isolation levels:
READ UNCOMMITTED
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2007-05-23 02:09 P.M.
Deadlocking occurs when two user processes have locks on separate objects and each process is trying to acquire a lock on the object that the other process has. When this happens, SQL Server ends the deadlock by automatically choosing one and aborting the process, allowing the other process to continue. The aborted transaction is rolled back and an error message is sent to the user of the aborted process. Generally, the transaction that requires th |
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