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更新日期2006-2-14

Lesson 02: The SqlConnection Object

This lesson describes the SqlConnection object and how to connect to a data base.  Here are the objectives of this lesson:

这节课描述了SqlConnection对象，和如何连接数据库。以下是本课目标

• Know what connection objects are used for.
• Learn how to instantiate a SqlConnection object.
• Understand how the SqlConnection object is used in applications.
• Comprehend the importance of effective connection lifetime management.
• 知道连接对象用来干什么
• 学习如何初始化SqlConnection对象
• 了解SqlConnection对象如何在应用程序中使用
• 理解有效连接生命周期管理的重要性

Introduction

引入

The first thing you will need to do when interacting with a data base is to create a connection.  The connection tells the rest of the ADO.NET code which data base it is talking to.  It manages all of the low level logic associated with the specific data base protocols.  This makes it easy for you because the most work you will have to do in code is instantiate the connection object, open the connection, and then close the connection when you are done.  Because of the way that other classes in ADO.NET are built, sometimes you don''''t even have to do that much work.

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