OleDbConnection.ChangeDatabase(String) 方法
定義
重要
部分資訊涉及發行前產品,在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊,不做任何明確或隱含的瑕疵擔保。
為開啟的 OleDbConnection 變更目前的資料庫。
public:
override void ChangeDatabase(System::String ^ value);
public:
virtual void ChangeDatabase(System::String ^ value);
public override void ChangeDatabase (string value);
public void ChangeDatabase (string value);
override this.ChangeDatabase : string -> unit
abstract member ChangeDatabase : string -> unit
override this.ChangeDatabase : string -> unit
Public Overrides Sub ChangeDatabase (value As String)
Public Sub ChangeDatabase (value As String)
參數
- value
- String
資料庫名稱。
實作
例外狀況
資料庫名稱無效。
連接未開啟。
無法變更資料庫。
範例
下列範例會建立 , OleDbConnection 並顯示其部分唯讀屬性。
static void ChangeDatabaseConnection(string connectionString)
{
using (OleDbConnection connection = new OleDbConnection(connectionString))
{
try
{
connection.Open();
Console.WriteLine("ServerVersion: {0} \nDatabase: {1}",
connection.ServerVersion, connection.Database);
connection.ChangeDatabase("Northwind");
Console.WriteLine("ServerVersion: {0} \nDatabase: {1}",
connection.ServerVersion, connection.Database);
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
// The connection is automatically closed when the
// code exits the using block.
}
}
Public Sub ChangeDatabaseConnection(ByVal connectionString As String)
Using connection As New OleDbConnection(connectionString)
Try
connection.Open()
Console.WriteLine("Server Version: {0} Database: {1}", _
connection.ServerVersion, connection.Database)
connection.ChangeDatabase("Northwind")
Console.WriteLine("Server Version: {0} Database: {1}", _
connection.ServerVersion, connection.Database)
Catch ex As Exception
Console.WriteLine(ex.Message)
End Try
' The connection is automatically closed when the
' code exits the Using block.
End Using
End Sub
備註
參數中 database
提供的值必須是有效的資料庫名稱。 參數 database
不能包含 Null 值、空字串或只有空白字元的字串。