database_doc: pq_lo_import

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#### 6.3.3 Importing large objects into a database

Loadable Function: oid = pq_lo_import (connection, path)

  Imports the file in path on the client side as a large object into the database associated with connection and returns the Oid of the new large object. If path ends with a `|`, it is take as a shell command whose output is piped into a large object.