pg_lo_open() opens a Large
Object and returns large object resource. The resource
encapsulates information about the connection. oid specifies a valid large object
oid and mode can be either
"r", "w", or "rw". It returns
FALSE if there is an error.
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To use the large object (lo) interface, it is necessary
to enclose it within a transaction block.
注: This function used to be called pg_loopen().
See also pg_lo_close() and
pg_lo_create().