OracleConnection OracleConnection OracleConnection OracleConnection Class



This API is now obsolete.

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.", false)]
public sealed class OracleConnection : System.Data.Common.DbConnection, ICloneable
type OracleConnection = class
    inherit DbConnection
    interface ICloneable
Public NotInheritable Class OracleConnection
Inherits DbConnection
Implements ICloneable


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;
        catch (Exception ex)
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
        Catch ex As Exception
        End Try
    End Using
End Sub


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.


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.


OracleConnection() OracleConnection() OracleConnection() OracleConnection()

Initializes a new instance of the OracleConnection.

OracleConnection(String) OracleConnection(String) OracleConnection(String) OracleConnection(String)

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


CanRaiseEvents CanRaiseEvents CanRaiseEvents CanRaiseEvents

Gets a value indicating whether the component can raise an event.

(Inherited from Component)
ConnectionString ConnectionString ConnectionString ConnectionString

Gets or sets the string used to open an Oracle database.

ConnectionTimeout ConnectionTimeout ConnectionTimeout ConnectionTimeout

Gets the time to wait to establish a connection before terminating the attempt and generating an error.

Container Container Container Container

Gets the IContainer that contains the Component.

(Inherited from Component)
Database Database Database Database

Gets the name of the current database or the database to be used after a connection is opened.

DataSource DataSource DataSource DataSource

Gets the name of the Oracle server to which to connect.

DesignMode DesignMode DesignMode DesignMode

Gets a value that indicates whether the Component is currently in design mode.

(Inherited from Component)
Events Events Events Events

Gets the list of event handlers that are attached to this Component.

(Inherited from Component)
ServerVersion ServerVersion ServerVersion ServerVersion

Gets a string containing the version of the server to which the client is connected.

Site Site Site Site

Gets or sets the ISite of the Component.

(Inherited from Component)
State State State State

Gets the current state of the connection.


BeginTransaction() BeginTransaction() BeginTransaction() BeginTransaction()

Begins a transaction at the database.

BeginTransaction(IsolationLevel) BeginTransaction(IsolationLevel) BeginTransaction(IsolationLevel) BeginTransaction(IsolationLevel)

Begins a transaction at the database with the specified IsolationLevel value.

ChangeDatabase(String) ChangeDatabase(String) ChangeDatabase(String) ChangeDatabase(String)

Changes the current database for an open OracleConnection.

ClearAllPools() ClearAllPools() ClearAllPools() ClearAllPools()

Empties the connection pool.

ClearPool(OracleConnection) ClearPool(OracleConnection) ClearPool(OracleConnection) ClearPool(OracleConnection)

Empties the connection pool associated with the specified connection.

Close() Close() Close() Close()

Closes the connection to the database.

CreateCommand() CreateCommand() CreateCommand() CreateCommand()

Creates and returns an OracleCommand object associated with the OracleConnection.

CreateObjRef(Type) CreateObjRef(Type) CreateObjRef(Type) 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() Dispose() Dispose() Dispose()

Releases all resources used by the Component.

(Inherited from Component)
Dispose(Boolean) Dispose(Boolean) Dispose(Boolean) Dispose(Boolean)

Releases the unmanaged resources used by the Component and optionally releases the managed resources.

(Inherited from Component)
EnlistDistributedTransaction(ITransaction) EnlistDistributedTransaction(ITransaction) EnlistDistributedTransaction(ITransaction) EnlistDistributedTransaction(ITransaction)

Enlists in the specified transaction as a distributed transaction.

EnlistTransaction(Transaction) EnlistTransaction(Transaction) EnlistTransaction(Transaction) EnlistTransaction(Transaction)

Enlists in the specified transaction as a distributed transaction.

Equals(Object) Equals(Object) Equals(Object) Equals(Object)

Determines whether the specified object is equal to the current object.

(Inherited from Object)
GetHashCode() GetHashCode() GetHashCode() GetHashCode()

Serves as the default hash function.

(Inherited from Object)
GetLifetimeService() GetLifetimeService() GetLifetimeService() GetLifetimeService()

Retrieves the current lifetime service object that controls the lifetime policy for this instance.

(Inherited from MarshalByRefObject)
GetSchema() GetSchema() GetSchema() GetSchema()

Returns schema information for the data source of this OracleConnection.

GetSchema(String) GetSchema(String) GetSchema(String) GetSchema(String)

Returns schema information for the data source of this OracleConnection using the specified string for the schema name.

GetSchema(String, String[]) GetSchema(String, String[]) GetSchema(String, String[]) 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.

GetService(Type) GetService(Type) GetService(Type) GetService(Type)

Returns an object that represents a service provided by the Component or by its Container.

(Inherited from Component)
GetType() GetType() GetType() GetType()

Gets the Type of the current instance.

(Inherited from Object)
InitializeLifetimeService() InitializeLifetimeService() InitializeLifetimeService() InitializeLifetimeService()

Obtains a lifetime service object to control the lifetime policy for this instance.

(Inherited from MarshalByRefObject)
MemberwiseClone() MemberwiseClone() MemberwiseClone() MemberwiseClone()

Creates a shallow copy of the current Object.

(Inherited from Object)
MemberwiseClone(Boolean) MemberwiseClone(Boolean) MemberwiseClone(Boolean) MemberwiseClone(Boolean)

Creates a shallow copy of the current MarshalByRefObject object.

(Inherited from MarshalByRefObject)
Open() Open() Open() Open()

Opens a connection to a database with the property settings specified by the ConnectionString.

ToString() ToString() ToString() ToString()

Returns a String containing the name of the Component, if any. This method should not be overridden.

(Inherited from Component)


Disposed Disposed Disposed Disposed

Occurs when the component is disposed by a call to the Dispose() method.

(Inherited from Component)
InfoMessage InfoMessage InfoMessage InfoMessage

Occurs when Oracle sends a warning or an informational message.

StateChange StateChange StateChange StateChange

Occurs when the state of the connection changes.

Explicit Interface Implementations

ICloneable.Clone() ICloneable.Clone() ICloneable.Clone() ICloneable.Clone()

Creates a new object that is a copy of the current instance.

IDbConnection.BeginTransaction() IDbConnection.BeginTransaction() IDbConnection.BeginTransaction() IDbConnection.BeginTransaction()

Begins a database transaction.

IDbConnection.BeginTransaction(IsolationLevel) IDbConnection.BeginTransaction(IsolationLevel) IDbConnection.BeginTransaction(IsolationLevel) IDbConnection.BeginTransaction(IsolationLevel)

Begins a database transaction with the specified IsolationLevel value.

IDbConnection.ChangeDatabase(String) IDbConnection.ChangeDatabase(String) IDbConnection.ChangeDatabase(String) IDbConnection.ChangeDatabase(String)

Changes the current database for an open Connection object.

IDbConnection.CreateCommand() IDbConnection.CreateCommand() IDbConnection.CreateCommand() IDbConnection.CreateCommand()

Creates and returns a Command object that is associated with the connection.

Applies to

See also