2 -- pass it the biblionumber, the position of the character to start in the leader starting at 0
3 -- and the text to replace, single characer or multiple
4 DROP FUNCTION IF EXISTS m_update_leader;
7 m_update_leader(bnumber INTEGER, ldr_position SMALLINT, new_value TEXT)
11 DECLARE ldr TEXT COLLATE utf8mb4_unicode_ci DEFAULT NULL;
12 DECLARE new_value_length SMALLINT DEFAULT 1;
13 SET ldr_position = ldr_position + 1;
14 SET new_value_length = LENGTH(new_value);
16 SELECT ExtractValue(metadata, '//leader') INTO ldr FROM biblio_metadata WHERE biblionumber = bnumber;
17 SET ldr = INSERT(ldr,ldr_position,new_value_length,new_value);
18 SET ldr = CONCAT('<leader>',ldr,'</leader>');
20 UPDATE biblio_metadata SET metadata = UpdateXML(metadata, '//leader', ldr) where biblionumber = bnumber;