Represents an open connection to a database. This class cannot be inherited.
Assembly: System.Data.OracleClient (in System.Data.OracleClient.dll)
Gets or sets the string used to open an Oracle database.(Overrides DbConnection.ConnectionString.)
Gets the time to wait to establish a connection before terminating the attempt and generating an error.(Overrides DbConnection.ConnectionTimeout.)
Gets the name of the current database or the database to be used after a connection is opened.(Overrides DbConnection.Database.)
Gets the name of the Oracle server to which to connect.(Overrides DbConnection.DataSource.)
Gets a string containing the version of the server to which the client is connected.(Overrides DbConnection.ServerVersion.)
Gets the current state of the connection.(Overrides DbConnection.State.)
Begins a transaction at the database.
Begins a transaction at the database with the specified IsolationLevel value.
Changes the current database for an open DbConnection.ChangeDatabase(String).).(Overrides
Empties the connection pool.
Empties the connection pool associated with the specified connection.
Closes the connection to the database. (Overrides DbConnection.Close().)
Creates and returns an OracleCommand object associated with the .
Creates an object that contains all the relevant information required to generate a proxy used to communicate with a remote object.(Inherited from MarshalByRefObject.)
Enlists in the specified transaction as a distributed transaction.
Enlists in the specified transaction as a distributed transaction.(Overrides DbConnection.EnlistTransaction(Transaction).)
Determines whether the specified object is equal to the current object.(Inherited from Object.)
Serves as the default hash function. (Inherited from Object.)
Retrieves the current lifetime service object that controls the lifetime policy for this instance.(Inherited from MarshalByRefObject.)
Returns schema information for the data source of this DbConnection.GetSchema().).(Overrides
Returns schema information for the data source of this DbConnection.GetSchema(String).)using the specified string for the schema name.(Overrides
Returns schema information for the data source of this DbConnection.GetSchema(String, String()).)using the specified string for the schema name and the specified string array for the restriction values.(Overrides
Obtains a lifetime service object to control the lifetime policy for this instance.(Inherited from MarshalByRefObject.)
This is the asynchronous version of Open. Providers should override with an appropriate implementation. The cancellation token can optionally be honored.
The default implementation invokes the synchronous Open call and returns a completed task. The default implementation will return a cancelled task if passed an already cancelled cancellationToken. Exceptions thrown by Open will be communicated via the returned Task Exception property.
Do not invoke other methods and properties of the DbConnection object until the returned Task is complete.(Inherited from DbConnection.)
Begins a database transaction.(Inherited from DbConnection.)
Creates a new object that is a copy of the current instance.
This type is deprecated and will be removed in a future version of the .NET Framework. For more information, see Oracle and ADO.NET.
Anobject represents a unique connection to an Oracle database. In the case of a client/server database system, it is equivalent to a network connection to the server.
An application that creates an instance of the OraclePermission object. Users can verify that their code has adequate permissions by using the OraclePermissionAttribute object. Users and administrators can also use the Code Access Security Policy Tool (Caspol.exe) to modify security policy at the machine, user, and enterprise levels. For more information, see Security in the .NET Framework.object can set declarative or imperative security demands that require all direct and indirect callers to have adequate permission to the code. creates security demands by using the
Unlike the Connection object in the other .NET Framework data providers (SQL Server, OLE DB, and ODBC), ConnectionTimeout property. Setting a connection time-out either as a property or in the connection string has no effect, and the value returned is always zero. also does not support a Database property or a ChangeDatabase method.does not support a
If the Close or Dispose, or by using the object within a Using statement. Otherwise, the garbage collection might not free them immediately. Such delays can cause errors if the maximum number of connections is reached while a number of connections are waiting to be deleted by the garbage collector. By contrast, closing the connections by calling Close uses native resources more efficiently, enhancing scalability and improving overall application performance. To ensure that connections are always closed, open the connection inside of a Using block.object goes out of scope, it remains open. Therefore, you should always close objects by calling
To deploy high-performance applications, you often need to use connection pooling. However, when you use the .NET Framework Data Provider for Oracle, you do not need to enable connection pooling because the provider manages this automatically.
The following example creates an OracleCommand and an . The is opened and set as the OracleCommand.Connection property. The example then calls ExecuteNonQuery, and closes the connection. To accomplish this, the ExecuteNonQuery is passed a connection string and a query string that is an SQL INSERT statement.
Public Sub InsertRow(ByVal connectionString As String) Dim queryString As String = _ "INSERT INTO Dept (DeptNo, Dname, Loc) values (50, 'TECHNOLOGY', 'DENVER')" Using connection As New OracleConnection(connectionString) Dim command As New OracleCommand(queryString) command.Connection = connection Try connection.Open() command.ExecuteNonQuery() Catch ex As Exception Console.WriteLine(ex.Message) End Try End Using End Sub
Available since 1.1
Any public static ( Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.