Descriptionint pg_lo_tell ( resource large_object )
pg_lo_tell() returns the current position (offset from the beginning) of a large object.
To use the large object interface, it is necessary to enclose it within a transaction block.
PostgreSQL large object (LOB) resource, returned by pg_lo_open().
The current seek offset (in number of bytes) from the beginning of the large object. If there is an error, the return value is negative.