ADO.NET 4 快速上手（2）——建立连接

二、 建立连接

1. 连接字符串

语法：key1=value1;key2=value2;…

DataSource	In SQL Server Express	In SQL Server
本地默认实例	.\SQLEXPRESS (local) (localhost) )\SQLEXPRESS (local)\SQLEXPRESS	. (local) (localhost)
非本地非默认实例	<主机名/IP>\<实例名>

Integrated Security：True/False，是否Windows验证。

例1：DataSource=DataBase1;User ID=sa;Password=sa

例2：DataSource=ServerName;Integrated Security=True;

参考：

http://msdn.microsoft.com/en-us/library/ms130822.aspx

http://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqlconnection.connectionstring%28v=VS.71%29.aspx

http://www.connectionstrings.com/

A. 手写连接字符串

string connectionString = "Data Source=(local);Initial Catalog=Northwind;Integrated Security=true";
SqlConnection connection = new SqlConnection(connectionString);
connection.Open();
// ...
connection.Close();
connection.Dispose();

B. 使用属性生成器生成连接字符串

SqlConnectionStringBuilder builder = new SqlConnectionStringBuilder();

builder.DataSource = "(local)";
builder.InitialCatalog = "Northwind";
builder.UserID = "user1";
builder.Password = "P@ssw0rd";

MessageBox.Show(builder.ConnectionString);

3. 向导建立连接

A. 设计时的连接，连接字符串未存于配置文件中

B. 运行时的连接，连接字符串可以存于配置文件

生成连接的过程完毕，下面的步骤，结束这个向导是为了始之前的操作生效。



程序中读取链接字符串：

Properties.Settings.Default.dbConnectionString