CopyFromFile Method

Applies To

OBlob

OClob

Description

Loads or copies a portion or all of a local file to the internal LOB value of this object.

Usage

void CopyFromFile(const char* filename, unsigned long amount = 0, unsigned long chunksize = 0, unsigned long offset = 1) const throw(OException)

Arguments

filename	A string specifying the absolute name and path for the file to be read.
amount	An integer specifying the maximum number of bytes or characters to be copied. Default value of 0 means total file size.
chunksize	An integer specifying the size for each read operation. This can range from 1 to amount. The optimal size for this will be a multiple of GetOptimumChunkSize. The default value of zero means a buffer is allocated equivalent to the size of the file.
offset	An integer specifying the absolute offset of the BLOB/CLOB value of this object. Default value is 1.

Remarks

Either a row-level lock or object-level lock should be obtained before calling this method.

Note: When manipulating LOBs using LOB methods, such as the Write and CopyFromFile, note that the LOB object will not automatically be trimmed if the length of the new data is smaller than the old data. Use the Trim method to shrink the LOB object to the size of the new data.