Append Method

OracleLob.Append Method

Appends data from the specified LOB to the current LOB.

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

public void Append (
	OracleLob source
public void Append (
	OracleLob source
public function Append (
	source : OracleLob
Not applicable.



The LOB from which to append data.

Exception typeCondition


The source OracleLob is null.


The source OracleLob is null, or the connection is closed.


The source OracleLob object was closed or disposed.


An Oracle error has occurred.

To write to the LOB, you must have retrieved the LOB using the FOR UPDATE clause in the SQL SELECT statement, and you must have a local transaction started.

All data from the source LOB is appended to the end of the current LOB. The position of neither LOB is evaluated or changed during this process.

The underlying data types must always be the same. For example, if you are appending from an NClob, the destination OracleLob must also be an NClob.


In this release, a write operation to a read-only LOB might succeed, but does not update the LOB on the server. In this case, however, the local copy of the LOB is updated. Therefore, later read operations on the OracleLob object might return the results of the write operation.

Windows 98, Windows Server 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1

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