pg_lo_read
Name
pg_lo_read -- read from a large object
Synopsis
pg_lo_read conn descriptor bufVar len
Description
   pg_lo_read reads at most
   len bytes from a large object into a
   variable named bufVar.
  
Arguments
- conn
-       The handle of a connection to the database in which the large object
      exists.
      
- descriptor
-       A descriptor for the large object from
      - pg_lo_open.
 
- bufVar
-       The name of a buffer variable to contain the large object
      segment.
      
- len
-       The maximum number of bytes to read.
      
Return Value
   The number of bytes actually read is returned; this could be less than
   the number requested if the end of the large object is reached first.
   In event of an error, the return value is negative.