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在asp.net中的WEB程序的設置中我們必須用到Web.config來存儲數據庫連接字.事實上這是個很好的做法,因為可以省去我們很多的麻煩還可以幫助我們避免不必要的錯位,是的很多情況下我就是這樣做.它通過XML來記錄這些信息.具體的是在....這個標記中來記錄的.這里請看一個ORACLE的例子如下:


<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>


而在你的應用程序中你只要這樣寫,就可以了,如下:

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

很輕松是嗎?不必每次都輸入同樣的連接字,也不要記住那些討厭的信息了,只需要起一個好記的名字就可以.好了下面我在來給出其他的一些連接字:

MYSQL的連接字:
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();

這里都是用VB.NET寫的，希望能對用VB寫ASP.NET的朋友一點幫助.

總結

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