| PostgreSQL 7.4.27 Documentation | ||||
|---|---|---|---|---|
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     There are two built-in server-side functions,
     lo_import
     and
     lo_export,
     for large object access, which are available for use in
     SQL commands.  Here is an example of their
     use:
CREATE TABLE image (
    name            text,
    raster          oid
);
INSERT INTO image (name, raster)
    VALUES ('beautiful image', lo_import('/etc/motd'));
SELECT lo_export(image.raster, '/tmp/motd') FROM image
    WHERE name = 'beautiful image';These functions read and write files in the server's file system, using the permissions of the database's owning user. Therefore, their use is restricted to superusers. (In contrast, the client-side import and export functions read and write files in the client's file system, using the permissions of the client program. Their use is not restricted.)