在config.web中保存数据库连接串_动网_社区论坛·开发者网络源动力

在asp中有多种方法保存数据库连接串，asp+提供了另一种新方式:config.web。quickstart中的许多demo都是直接将连接串写在程序中。这对于demo用途是没有问题，但在实际使用中是不行的。 
 
本文示范如何使用config.web来存储连接串。在每页asp.net中你只需用 
调出来就可以直接使用了。这样做的好处一是安全，二是方便，改密码时只需改一个地方即可。 
 
废话少说，这里就是code:(放在该application的根目录下) 
 
Config.web 
<configuration> 
<appsettings> 
<add key="MyConn" value="server=localhost;uid=sa;pwd=mypassword;Database=somedatabase"/> 
</appsettings> 
</configuration> 
 
 
Somepage.aspx 
<%@ Import Namespace="System.Data" %> 
<%@ Import Namespace="System.Data.SQL" %> 
 
<script language="VB" runat="server"> 
 
Sub Page_Load(Src As Object, E As EventArgs) 
 
'This is the meat of calling the DSN out of the config.web 
 
'Setting a local variable to hold the connection string variable 
Dim MyConnection As SQLConnection 
Dim Config as HashTable 
 
'Setting a local variable to hold the connection string 
Config = Context.GetConfig("appsettings") 
MyConnection = New SQLConnection(Config("MyConn")) 
 
'Setting a command object to insert some data into a database 
Dim MyCommand As SQLCommand 
 
dim parm1 as string = "SomeTextValue" 
dim parm2 as string = "SomeTextValue2" 
 
Dim InsertCmd As String = "Insert into tablename values (@parm1, @parm2)" 
 
'Using the connection string 
MyCommand = New SQLCommand(InsertCmd, MyConnection) 
 
MyCommand.Parameters.Add(New SQLParameter("@Parm1", SQLDataType.VarChar, 50)) 
MyCommand.Parameters("@Parm1").Value = Parm1 
 
MyCommand.Parameters.Add(New SQLParameter("@Parm2", SQLDataType.VarChar, 50)) 
MyCommand.Parameters("@Parm2").Value = Parm2 
 
MyCommand.ActiveConnection.Open() 
MyCommand.Execute() 
MyCommand.ActiveConnection.Close() 
 
End Sub 
</script> 
 
讨饭猫翻译自aspfree.com