PostgreSQL 7.1.3 Documentation
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# 2.4. Built in registered functions

There are two built-in registered functions, lo_import and lo_export which are convenient for use in SQL queries. 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';

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