--- /dev/null
+BEGIN;
+
+INSERT INTO config.upgrade_log (version) VALUES ('0408'); -- gmc
+
+CREATE OR REPLACE FUNCTION maintain_901 () RETURNS TRIGGER AS $func$
+BEGIN
+ -- Remove any existing 901 fields before we insert the authoritative one
+ NEW.marc := REGEXP_REPLACE(NEW.marc, E'<datafield\s*[^<>]*?\s*tag="901".+?</datafield>', '', 'g');
+ IF TG_TABLE_SCHEMA = 'biblio' THEN
+ NEW.marc := REGEXP_REPLACE(
+ NEW.marc,
+ E'(</(?:[^:]*?:)?record>)',
+ E'<datafield tag="901" ind1=" " ind2=" ">' ||
+ '<subfield code="a">' || NEW.tcn_value || E'</subfield>' ||
+ '<subfield code="b">' || NEW.tcn_source || E'</subfield>' ||
+ '<subfield code="c">' || NEW.id || E'</subfield>' ||
+ '<subfield code="t">' || TG_TABLE_SCHEMA || E'</subfield>' ||
+ CASE WHEN NEW.owner IS NOT NULL THEN '<subfield code="o">' || NEW.owner || E'</subfield>' ELSE '' END ||
+ CASE WHEN NEW.share_depth IS NOT NULL THEN '<subfield code="d">' || NEW.share_depth || E'</subfield>' ELSE '' END ||
+ E'</datafield>\\1'
+ );
+ ELSIF TG_TABLE_SCHEMA = 'authority' THEN
+ NEW.marc := REGEXP_REPLACE(
+ NEW.marc,
+ E'(</(?:[^:]*?:)?record>)',
+ E'<datafield tag="901" ind1=" " ind2=" ">' ||
+ '<subfield code="c">' || NEW.id || E'</subfield>' ||
+ '<subfield code="t">' || TG_TABLE_SCHEMA || E'</subfield>' ||
+ E'</datafield>\\1'
+ );
+ ELSIF TG_TABLE_SCHEMA = 'serial' THEN
+ NEW.marc := REGEXP_REPLACE(
+ NEW.marc,
+ E'(</(?:[^:]*?:)?record>)',
+ E'<datafield tag="901" ind1=" " ind2=" ">' ||
+ '<subfield code="c">' || NEW.id || E'</subfield>' ||
+ '<subfield code="t">' || TG_TABLE_SCHEMA || E'</subfield>' ||
+ '<subfield code="o">' || NEW.owning_lib || E'</subfield>' ||
+ CASE WHEN NEW.record IS NOT NULL THEN '<subfield code="r">' || NEW.record || E'</subfield>' ELSE '' END ||
+ E'</datafield>\\1'
+ );
+ ELSE
+ NEW.marc := REGEXP_REPLACE(
+ NEW.marc,
+ E'(</(?:[^:]*?:)?record>)',
+ E'<datafield tag="901" ind1=" " ind2=" ">' ||
+ '<subfield code="c">' || NEW.id || E'</subfield>' ||
+ '<subfield code="t">' || TG_TABLE_SCHEMA || E'</subfield>' ||
+ E'</datafield>\\1'
+ );
+ END IF;
+
+ RETURN NEW;
+END;
+$func$ LANGUAGE PLPGSQL;
+
+COMMIT;