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';