OracleConnection Class

Definition

Namespace:

System.Data.OracleClient

Assembly:

System.Data.OracleClient.dll

Caution

OracleConnection has been deprecated. http://go.microsoft.com/fwlink/?LinkID=144260

Represents an open connection to a database. This class cannot be inherited.

public ref class OracleConnection sealed : System::Data::Common::DbConnection, ICloneable

[System.Obsolete("OracleConnection has been deprecated. http://go.microsoft.com/fwlink/?LinkID=144260", false)]
public sealed class OracleConnection : System.Data.Common.DbConnection, ICloneable

[<System.Obsolete("OracleConnection has been deprecated. http://go.microsoft.com/fwlink/?LinkID=144260", false)>]
type OracleConnection = class
    inherit DbConnection
    interface ICloneable

Public NotInheritable Class OracleConnection
Inherits DbConnection
Implements ICloneable

Inheritance

Object

MarshalByRefObject

Component

DbConnection

OracleConnection

Attributes

ObsoleteAttribute

Implements

ICloneable

Examples

The following example creates an OracleCommand and an OracleConnection. The OracleConnection 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 void InsertRow(string connectionString)
{
    string queryString =
        "INSERT INTO Dept (DeptNo, Dname, Loc) values (50, 'TECHNOLOGY', 'DENVER')";
    using (OracleConnection connection = new OracleConnection(connectionString))
    {
        OracleCommand command = new OracleCommand(queryString);
        command.Connection = connection;
        try
        {
            connection.Open();
            command.ExecuteNonQuery();
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex.Message);
        }
    }
}

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

Remarks

This type is deprecated and will be removed in a future version of the .NET Framework. For more information, see Oracle and ADO.NET.

An OracleConnection object 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 OracleConnection object can set declarative or imperative security demands that require all direct and indirect callers to have adequate permission to the code. OracleConnection creates security demands by using 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.

Note

Unlike the Connection object in the other .NET Framework data providers (SQL Server, OLE DB, and ODBC), OracleConnection does not support a 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. OracleConnection also does not support a Database property or a ChangeDatabase method.

If the OracleConnection object goes out of scope, it remains open. Therefore, you should always close OracleConnection objects by calling Close or Dispose, or by using the OracleConnection 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.

Note

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.

Constructors

OracleConnection()	Initializes a new instance of the OracleConnection.
OracleConnection(String)	Initializes a new instance of the OracleConnection class with the specified connection string.

Properties

CanCreateBatch	Gets a value that indicates whether this DbConnection instance supports the DbBatch class. (Inherited from DbConnection)
CanRaiseEvents	Gets a value indicating whether the component can raise an event. (Inherited from Component)
ConnectionString	Gets or sets the string used to open an Oracle database.
ConnectionTimeout	Gets the time to wait to establish a connection before terminating the attempt and generating an error.
Container	Gets the IContainer that contains the Component. (Inherited from Component)
Database	Gets the name of the current database or the database to be used after a connection is opened.
DataSource	Gets the name of the Oracle server to which to connect.
DbProviderFactory	Gets the DbProviderFactory for this DbConnection. (Inherited from DbConnection)
DesignMode	Gets a value that indicates whether the Component is currently in design mode. (Inherited from Component)
Events	Gets the list of event handlers that are attached to this Component. (Inherited from Component)
ServerVersion	Gets a string containing the version of the server to which the client is connected.
Site	Gets or sets the ISite of the Component. (Inherited from Component)
State	Gets the current state of the connection.

Methods

BeginDbTransaction(IsolationLevel)	When overridden in a derived class, starts a database transaction. (Inherited from DbConnection)
BeginDbTransactionAsync(IsolationLevel, CancellationToken)	Asynchronously starts a database transaction. (Inherited from DbConnection)
BeginTransaction()	Begins a transaction at the database.
BeginTransaction(IsolationLevel)	Begins a transaction at the database with the specified IsolationLevel value.
BeginTransactionAsync(CancellationToken)	Asynchronously begins a database transaction. (Inherited from DbConnection)
BeginTransactionAsync(IsolationLevel, CancellationToken)	Asynchronously begins a database transaction. (Inherited from DbConnection)
ChangeDatabase(String)	Changes the current database for an open OracleConnection.
ChangeDatabaseAsync(String, CancellationToken)	Asynchronously changes the current database for an open connection. (Inherited from DbConnection)
ClearAllPools()	Empties the connection pool.
ClearPool(OracleConnection)	Empties the connection pool associated with the specified connection.
Close()	Closes the connection to the database.
CloseAsync()	Asynchronously closes the connection to the database. (Inherited from DbConnection)
CreateBatch()	Returns a new instance of the provider's class that implements the DbBatch class. (Inherited from DbConnection)
CreateCommand()	Creates and returns an OracleCommand object associated with the OracleConnection.
CreateDbBatch()	When overridden in a derived class, returns a new instance of the provider's class that implements the DbBatch class. (Inherited from DbConnection)
CreateDbCommand()	When overridden in a derived class, creates and returns a DbCommand object associated with the current connection. (Inherited from DbConnection)
CreateObjRef(Type)	Creates an object that contains all the relevant information required to generate a proxy used to communicate with a remote object. (Inherited from MarshalByRefObject)
Dispose()	Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources. (Inherited from DbConnection)
Dispose(Boolean)	Releases the unmanaged resources used by the DbConnection and optionally releases the managed resources. (Inherited from DbConnection)
DisposeAsync()	Asynchronously diposes the connection object. (Inherited from DbConnection)
EnlistDistributedTransaction(ITransaction)	Enlists in the specified transaction as a distributed transaction.
EnlistTransaction(Transaction)	Enlists in the specified transaction as a distributed transaction.
Equals(Object)	Determines whether the specified object is equal to the current object. (Inherited from Object)
GetHashCode()	Serves as the default hash function. (Inherited from Object)
GetLifetimeService()	Retrieves the current lifetime service object that controls the lifetime policy for this instance. (Inherited from MarshalByRefObject)
GetSchema()	Returns schema information for the data source of this OracleConnection.
GetSchema(String)	Returns schema information for the data source of this OracleConnection using the specified string for the schema name.
GetSchema(String, String[])	Returns schema information for the data source of this OracleConnection using the specified string for the schema name and the specified string array for the restriction values.
GetSchemaAsync(CancellationToken)	This is an asynchronous version of GetSchema(). Providers should override with an appropriate implementation. The cancellationToken can optionally be honored. The default implementation invokes the synchronous GetSchema() call and returns a completed task. The default implementation will return a cancelled task if passed an already cancelled cancellationToken. Exceptions thrown by GetSchema() will be communicated via the returned Task Exception property. (Inherited from DbConnection)
GetSchemaAsync(String, CancellationToken)	This is the asynchronous version of GetSchema(String). Providers should override with an appropriate implementation. The cancellationToken can optionally be honored. The default implementation invokes the synchronous GetSchema(String) call and returns a completed task. The default implementation will return a cancelled task if passed an already cancelled cancellationToken. Exceptions thrown by GetSchema(String) will be communicated via the returned Task Exception property. (Inherited from DbConnection)
GetSchemaAsync(String, String[], CancellationToken)	This is the asynchronous version of GetSchema(String, String[]). Providers should override with an appropriate implementation. The cancellationToken can optionally be honored. The default implementation invokes the synchronous GetSchema(String, String[]) call and returns a completed task. The default implementation will return a cancelled task if passed an already cancelled cancellationToken. Exceptions thrown by GetSchema(String, String[]) will be communicated via the returned Task Exception property. (Inherited from DbConnection)
GetService(Type)	Returns an object that represents a service provided by the Component or by its Container. (Inherited from Component)
GetType()	Gets the Type of the current instance. (Inherited from Object)
InitializeLifetimeService()	Obtains a lifetime service object to control the lifetime policy for this instance. (Inherited from MarshalByRefObject)
MemberwiseClone()	Creates a shallow copy of the current Object. (Inherited from Object)
MemberwiseClone(Boolean)	Creates a shallow copy of the current MarshalByRefObject object. (Inherited from MarshalByRefObject)
OnStateChange(StateChangeEventArgs)	Raises the StateChange event. (Inherited from DbConnection)
Open()	Opens a connection to a database with the property settings specified by the ConnectionString.
OpenAsync()	An asynchronous version of Open(), which opens a database connection with the settings specified by the ConnectionString. This method invokes the virtual method OpenAsync(CancellationToken) with CancellationToken.None. (Inherited from DbConnection)
OpenAsync(CancellationToken)	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)
ToString()	Returns a String containing the name of the Component, if any. This method should not be overridden. (Inherited from Component)

Events

Disposed	Occurs when the component is disposed by a call to the Dispose() method. (Inherited from Component)
InfoMessage	Occurs when Oracle sends a warning or an informational message.
StateChange	Occurs when the state of the connection changes. (Inherited from DbConnection)

Explicit Interface Implementations

ICloneable.Clone()	Creates a new object that is a copy of the current instance.
IDbConnection.BeginTransaction()	Begins a database transaction. (Inherited from DbConnection)
IDbConnection.BeginTransaction(IsolationLevel)	Begins a database transaction with the specified isolation level. (Inherited from DbConnection)
IDbConnection.CreateCommand()	Creates and returns a DbCommand object that is associated with the current connection. (Inherited from DbConnection)

See also

• OracleDataAdapter
• OracleCommand