adding m_ for koha functions and an update_leader function

[migration-tools.git] / sql / koha / marc_functions.sql

diff --git a/sql/koha/marc_functions.sql b/sql/koha/marc_functions.sql
new file mode 100644 (file)
index 0000000..08d5e8e
--- /dev/null
+++ b/sql/koha/marc_functions.sql
@@ -0,0 +1,27 @@
+
+-- pass it the biblionumber, the position of the character to start in the leader starting at 0 
+-- and the text to replace, single characer or multiple 
+DROP FUNCTION IF EXISTS m_update_leader;
+DELIMITER $
+CREATE FUNCTION
+   m_update_leader(bnumber INTEGER, ldr_position SMALLINT, new_value TEXT)
+   RETURNS BOOLEAN
+   DETERMINISTIC
+    BEGIN
+        DECLARE ldr TEXT COLLATE utf8mb4_unicode_ci DEFAULT NULL;
+        DECLARE new_value_length SMALLINT DEFAULT 1;
+        SET ldr_position = ldr_position + 1;
+        SET new_value_length = LENGTH(new_value);
+        
+        SELECT ExtractValue(metadata, '//leader') INTO ldr FROM biblio_metadata WHERE biblionumber = bnumber;
+        SET ldr = INSERT(ldr,ldr_position,new_value_length,new_value);
+        SET ldr = CONCAT('<leader>',ldr,'</leader>');
+
+        UPDATE biblio_metadata SET metadata = UpdateXML(metadata, '//leader', ldr) where biblionumber = bnumber;
+        RETURN TRUE;
+        
+    END
+$
+DELIMITER ;
+
+