http://stackoverflow.com/a/20056883

db_to_csv.sql

# http://stackoverflow.com/a/20056883

CREATE OR REPLACE FUNCTION db_to_csv(path TEXT) RETURNS void AS $$
declare
  tables RECORD;
  statement TEXT;
begin
  FOR tables IN 
    SELECT (table_schema || '.' || table_name) AS schema_table
    FROM information_schema.tables t INNER JOIN information_schema.schemata s 
    ON s.schema_name = t.table_schema 
    WHERE t.table_schema NOT IN ('pg_catalog', 'information_schema', 'configuration')
    ORDER BY schema_table
  LOOP
    statement := 'COPY ' || tables.schema_table || ' TO ''' || path || '/' || tables.schema_table || '.csv' ||''' DELIMITER '';'' CSV HEADER';
    EXECUTE statement;
  END LOOP;
  return;  
end;
$$ LANGUAGE plpgsql;

SELECT db_to_csv('/home/user/dir');
-- this will create one csv file per table, in /home/user/dir/