2.4. Server-side Built-in 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';