在asp.net中的WEB程序的设置中我们必须用到Web.config来存储数据库连接字.事实上这是个很好的做法,因为可以省去我们很多的麻烦还可以帮助我们避免不必要的错位,是的很多情况下我就是这样做.它通过XML来记录这些信息.具体的是在<appSettings>....</appSettings>这个标记中来记录的.这里请看一个ORACLE的例子如下:

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<appSettings> <add key="ORACLEConnectionString" value="Provider=OraOLEDB.Oracle.1; Persist Security Info=False;Password=blah;User ID=greg;Data Source=sph;" /> <add key="SQLConnectionString" value="data source=SQL1;initial catalog=ID_V; integrated security=SSPI;persist security info=False;workstation id=TH03D374; packet size=4096"/> <appSettings>
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而在你的应用程序中你只要这样写,就可以了,如下:

string conn = ConfigurationSettings.AppSettings["ORACLEConnectionString"];
OleDbConnection myConnection = new OleDbConnection(conn);

很轻松是吗?不必每次都输入同样的连接字,也不要记住那些讨厌的信息了,只需要起一个好记的名字就可以.好了下面我在来给出其他的一些连接字:

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MYSQL的连接字: ConnectionString = "Data Source=localhost;" + "Database=mySQLDatabase;" + "User ID=myUsername;" + "Password=myPassword;" + "Command Logging=false"; OLE DB的: IBM AS/400 OLE DB 的 ' VB.NET Dim oOleDbConnection As OleDb.OleDbConnection Dim sConnString As String = _ "Provider=IBMDA400.DataSource.1;" & _ "Data source=myAS400DbName;" & _ "User Id=myUsername;" & _ "Password=myPassword" oOleDbConnection = New OleDb.OleDbConnection(sConnString) oOleDbConnection.Open() JET OLE DB 的 ' VB.NET Dim oOleDbConnection As OleDb.OleDbConnection Dim sConnString As String = _ "Provider=Microsoft.Jet.OLEDB.4.0;" & _ "Data Source=C:\myPath\myJet.mdb;" & _ "User ID=Admin;" & _ "Password=" oOleDbConnection = New OleDb.OleDbConnection(sConnString) oOleDbConnection.Open() Oracle OLE DB 的 ' VB.NET Dim oOleDbConnection As OleDb.OleDbConnection Dim sConnString As String = _ "Provider=OraOLEDB.Oracle;" & _ "Data Source=MyOracleDB;" & _ "User ID=myUsername;" & _ "Password=myPassword" oOleDbConnection = New OleDb.OleDbConnection(sConnString) oOleDbConnection.Open() SQL Server OLE DB 的 ' VB.NET Dim oOleDbConnection As OleDb.OleDbConnection Dim sConnString As String = _ "Provider=sqloledb;" & _ "Data Source=myServerName;" & _ "Initial Catalog=myDatabaseName;" & _ "User Id=myUsername;" & _ "Password=myPassword" oOleDbConnection = New OleDb.OleDbConnection(sConnString) oOleDbConnection.Open() Sybase ASE OLE DB 的 ' VB.NET Dim oOleDbConnection As OleDb.OleDbConnection Dim sConnString As String = _ "Provider=Sybase ASE OLE DB Provider;" & _ "Data Source=MyDataSourceName;" & _ "Server Name=MyServerName;" & _ "Database=MyDatabaseName;" & _ "User ID=myUsername;" & _ "Password=myPassword" oOleDbConnection = New OleDb.OleDbConnection(sConnString) oOleDbConnection.Open() SQL Server在System.Data.SqlClient SqlConnection oSQLConn = new SqlConnection(); oSQLConn.ConnectionString = "Data Source=(local);" + "Initial Catalog=mySQLServerDBName;" + "Integrated Security=SSPI"; oSQLConn.Open();
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这里都是用VB.NET写的，希望能对用VB写ASP.NET的朋友一点帮助.