bool seek(int offset,
Sets the internal pointer of the large object.
Indicates the amount of bytes, on which internal pointer should be
moved from the position, pointed by whence.
May be one of:
OCI_SEEK_SET - sets the position equal to
OCI_SEEK_CUR - adds offset
bytes to the current position
OCI_SEEK_END - adds offset
bytes to the end of large object (use negative value to move to a position
before the end of large object)
TRUE on success or
FALSE on failure.