OCILobAppend()

Purpose

Appends a LOB value at the end of another LOB as specified.

Syntax

sword OCILobAppend ( OCISvcCtx        *svchp,
                     OCIError         *errhp,
                     OCILobLocator    *dst_locp,
                     OCILobLocator    *src_locp );

Parameters

svchp (IN)

The service context handle.

errhp (IN/OUT)

An error handle you can pass to OCIErrorGet() for diagnostic information in the event of an error.

dst_locp (IN/OUT)

An internal LOB locator uniquely referencing the destination LOB. This locator must be a locator that was obtained from the server specified by svchp.

src_locp (IN)

An internal LOB locator uniquely referencing the source LOB. This locator must be a locator that was obtained from the server specified by svchp.

Comments

Appends a LOB value at the end of another LOB as specified. The data is copied from the source to the end of the destination. The source and destination LOBs must already exist. The destination LOB is extended to accommodate the newly written data. It is an error to extend the destination LOB beyond the maximum length allowed (4 gigabytes) or to try to copy from a NULL LOB.

The source and the destination LOB locators must be of the same type (i.e., they must both be BLOBs or both be CLOBs). LOB buffering must not be enabled for either type of locator. This function does not accept a FILE locator as the source or the destination.

It is not mandatory that you wrap this LOB operation inside the Open/Close calls. If you did not open the LOB prior to performing this operation, then the functional and domain indexes on the LOB column are updated during this call. However, if you did open the LOB prior to performing this operation, then you must close it before you commit or rollback your transaction. When an internal LOB is closed, it updates the functional and domain indexes on the LOB column.

If you do not wrap your LOB operations inside the Open/Close API, then the functional and domain indexes are updated each time you write to the LOB. This can adversely affect performance. If you have functional or domain indexes, we recommend that you enclose write operations to the LOB within the open/close statements.

Related Functions

OCILobTrim(), OCILobWrite(), OCILobCopy(), OCIErrorGet(), OCILobWriteAppend()