AppendChunk Method

Applies To

OField

Description

This method appends data to a long or long raw field.

Usage

oresult AppendChunk(const void *chunkp, unsigned short numbytes)

Arguments	Description
chunkp	A pointer to the data to append.
numbytes	The number of bytes from chunkp to append.

Remarks

Long and long raw columns in an Oracle database can hold large amounts of data. The AppendChunk method enables you to add data to a long field piecewise. You can add a maximum of 64K at once. Each call to AppendChunk adds data following any other calls. AppendChunk calls must be made while the dynaset is in an editing mode started by either StartEdit, AddNewRecord, or DuplicateRecord. This method is valid only for fields with server types of OTYPE_LONG or OTYPE_LONGRAW.

Return Value

An oresult indicating whether the operation succeeded (OSUCCESS) or not (OFAILURE).

Example

This example adds take an image segmented into several chunks and stores it in the database.

// we have an open dynaset pictdyn

// get an OField on the "picture" field of the dynaset

OField pictfield = pictdyn.GetField();

// now start editing

pictdyn.StartEdit();

// and loop through the chunks of the picture

int ii;

for (ii=0; ii<nchunks; ii++)

pictfield.AppendChunk((const void *) picture[ii], plen[ii]);

// and save it to the database

pictdyn.Update();