在config.web中保存数据库连接串
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。<br>
<br>
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<br>
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。<br>
<br>
废话少说，这里就是code:(放在该application的根目录下)<br>
<br>
Config.web<br>
<configuration> <br>
<appsettings><br>
<add key="MyConn" value="server=localhost;uid=sa;pwd=mypassword;Database=somedatabase"/><br>
</appsettings><br>
</configuration><br>
<br>
<br>
Somepage.aspx<br>
<%@ Import Namespace="System.Data" %><br>
<%@ Import Namespace="System.Data.SQL" %><br>
<br>
<script language="VB" runat="server"><br>
<br>
Sub Page_Load(Src As Object, E As EventArgs) <br>
<br>
'This is the meat of calling the DSN out of the config.web<br>
<br>
'Setting a local variable to hold the connection string variable<br>
Dim MyConnection As SQLConnection<br>
Dim Config as HashTable<br>
<br>
'Setting a local variable to hold the connection string<br>
Config = Context.GetConfig("appsettings")<br>
MyConnection = New SQLConnection(Config("MyConn"))<br>
<br>
'Setting a command object to insert some data into a database<br>
Dim MyCommand As SQLCommand<br>
<br>
dim parm1 as string = "SomeTextValue"<br>
dim parm2 as string = "SomeTextValue2"<br>
<br>
Dim InsertCmd As String = "Insert into tablename values (@parm1, @parm2)"<br>
<br>
'Using the connection string<br>
MyCommand = New SQLCommand(InsertCmd, MyConnection)<br>
<br>
MyCommand.Parameters.Add(New SQLParameter("@Parm1", SQLDataType.VarChar, 50))<br>
MyCommand.Parameters("@Parm1").Value = Parm1<br>
<br>
MyCommand.Parameters.Add(New SQLParameter("@Parm2", SQLDataType.VarChar, 50))<br>
MyCommand.Parameters("@Parm2").Value = Parm2<br>
<br>
MyCommand.ActiveConnection.Open()<br>
MyCommand.Execute()<br>
MyCommand.ActiveConnection.Close()<br>
<br>
End Sub<br>
</script><br>
<br>
讨饭猫 翻译自aspfree.com<br>
