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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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