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OracleConnection Class

Note: This API is now obsolete.

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


Namespace:  System.Data.OracleClient
Assembly:  System.Data.OracleClient (in System.Data.OracleClient.dll)

[<ObsoleteAttribute("OracleConnection has been deprecated.", 
type OracleConnection =  
        inherit DbConnection
        interface ICloneable

The OracleConnection type exposes the following members.

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

Protected propertyCanRaiseEventsGets a value indicating whether the component can raise an event. (Inherited from Component.)
Public propertyConnectionStringGets or sets the string used to open an Oracle database. (Overrides DbConnection.ConnectionString.)
Public propertyConnectionTimeoutGets the time to wait to establish a connection before terminating the attempt and generating an error. (Overrides DbConnection.ConnectionTimeout.)
Public propertyContainerGets the IContainer that contains the Component. (Inherited from Component.)
Public propertyDatabaseGets the name of the current database or the database to be used after a connection is opened. (Overrides DbConnection.Database.)
Public propertyDataSourceGets the name of the Oracle server to which to connect. (Overrides DbConnection.DataSource.)
Protected propertyDbProviderFactoryGets the DbProviderFactory for this DbConnection. (Inherited from DbConnection.)
Protected propertyDesignModeGets a value that indicates whether the Component is currently in design mode. (Inherited from Component.)
Protected propertyEventsGets the list of event handlers that are attached to this Component. (Inherited from Component.)
Public propertyServerVersionGets a string containing the version of the server to which the client is connected. (Overrides DbConnection.ServerVersion.)
Public propertySiteGets or sets the ISite of the Component. (Inherited from Component.)
Public propertyStateGets the current state of the connection. (Overrides DbConnection.State.)

Protected methodBeginDbTransactionStarts a database transaction. (Inherited from DbConnection.)
Public methodBeginTransaction()Begins a transaction at the database.
Public methodBeginTransaction(IsolationLevel)Begins a transaction at the database with the specified IsolationLevel value.
Public methodChangeDatabaseChanges the current database for an open OracleConnection. (Overrides DbConnection.ChangeDatabase(String).)
Public methodStatic memberClearAllPoolsEmpties the connection pool.
Public methodStatic memberClearPoolEmpties the connection pool associated with the specified connection.
Public methodCloseCloses the connection to the database. (Overrides DbConnection.Close().)
Public methodCreateCommandCreates and returns an OracleCommand object associated with the OracleConnection.
Protected methodCreateDbCommandCreates and returns a DbCommand object associated with the current connection. (Inherited from DbConnection.)
Public methodCreateObjRefCreates an object that contains all the relevant information required to generate a proxy used to communicate with a remote object. (Inherited from MarshalByRefObject.)
Public methodDispose()Releases all resources used by the Component. (Inherited from Component.)
Protected methodDispose(Boolean)Releases the unmanaged resources used by the Component and optionally releases the managed resources. (Inherited from Component.)
Public methodEnlistDistributedTransactionEnlists in the specified transaction as a distributed transaction.
Public methodEnlistTransactionEnlists in the specified transaction as a distributed transaction. (Overrides DbConnection.EnlistTransaction(Transaction).)
Public methodEquals(Object)Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
Protected methodFinalizeReleases unmanaged resources and performs other cleanup operations before the Component is reclaimed by garbage collection. (Inherited from Component.)
Public methodGetHashCodeServes as a hash function for a particular type. (Inherited from Object.)
Public methodGetLifetimeServiceRetrieves the current lifetime service object that controls the lifetime policy for this instance. (Inherited from MarshalByRefObject.)
Public methodGetSchema()Returns schema information for the data source of this OracleConnection. (Overrides DbConnection.GetSchema().)
Public methodGetSchema(String)Returns schema information for the data source of this OracleConnection using the specified string for the schema name. (Overrides DbConnection.GetSchema(String).)
Public methodGetSchema(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. (Overrides DbConnection.GetSchema(String, String[]).)
Protected methodGetServiceReturns an object that represents a service provided by the Component or by its Container. (Inherited from Component.)
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Public methodInitializeLifetimeServiceObtains a lifetime service object to control the lifetime policy for this instance. (Inherited from MarshalByRefObject.)
Protected methodMemberwiseClone()Creates a shallow copy of the current Object. (Inherited from Object.)
Protected methodMemberwiseClone(Boolean)Creates a shallow copy of the current MarshalByRefObject object. (Inherited from MarshalByRefObject.)
Protected methodOnStateChangeRaises the StateChange event. (Inherited from DbConnection.)
Public methodOpenOpens a connection to a database with the property settings specified by the ConnectionString. (Overrides DbConnection.Open().)
Public methodToStringReturns a String containing the name of the Component, if any. This method should not be overridden. (Inherited from Component.)

Public eventDisposedOccurs when the component is disposed by a call to the Dispose method. (Inherited from Component.)
Public eventInfoMessageOccurs when Oracle sends a warning or an informational message.
Public eventStateChangeOccurs when the state of the event changes. (Inherited from DbConnection.)

Explicit interface implemetationPrivate methodICloneable.CloneCreates a new object that is a copy of the current instance.
Explicit interface implemetationPrivate methodIDbConnection.BeginTransaction()Begins a database transaction. (Inherited from DbConnection.)
Explicit interface implemetationPrivate methodIDbConnection.BeginTransaction(IsolationLevel)Begins a database transaction with the specified IsolationLevel value. (Inherited from DbConnection.)
Explicit interface implemetationPrivate methodIDbConnection.CreateCommandCreates and returns a DbCommand object that is associated with the current connection. (Inherited from DbConnection.)

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 in the .NET Framework.


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.


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 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.

No code example is currently available or this language may not be supported.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1
Obsolete (compiler warning) in 4

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.