MYSQL TRIGGER with DECLARE value - mysql

Question

I want to set value using declare on trigger. The trigger is as follow:
CREATE DEFINER=`root`#`localhost` TRIGGER `update_queue_after_insert` AFTER INSERT ON `encounter_note` FOR EACH ROW DECLARE is_exist INT;
SET is_exist = ( SELECT count(*) FROM practice_last_updated_module WHERE practice_id = NEW.practice_id );
IF NEW.enc_source = 'OP' THEN
UPDATE practice_queue_list PQL SET
PQL.vital_check = IF (NEW.vs_weight <> 0 OR NEW.vs_height <> 0 OR NEW. vs_temperature <> 0 OR LENGTH(NEW.vs_blood_pressure) > 0 <> NEW.vs_pulse <> 0 OR NEW.vs_respiration <> 0, 1, 0)
WHERE PQL.encounter_id = NEW.id AND PQL.practice_place_id = NEW.practice_id;
END IF;
IF is_exist > 0 THEN
UPDATE practice_last_updated_module SET encounter = UNIX_TIMESTAMP(NOW()) where practice_id = NEW.practice_id;
ELSE:
INSERT INTO practice_last_updated_module (practice_id, encounter) VALUES (NEW.practice_id, UNIX_TIMESTAMP(NOW()));
END IF;"
But it returns error on saving
The following query has failed: "CREATE DEFINER=root#localhost
TRIGGER update_queue_after_insert AFTER INSERT ON encounter_note
FOR EACH ROW DECLARE is_exist INT; SET is_exist = ( SELECT count(*)
FROM practice_last_updated_module WHERE
What's wrong with the statement?

Answer 1

Use 13.6.1 BEGIN ... END Compound-Statement Syntax.
Try (maybe you need to use DELIMITER):
DELIMITER //
CREATE TRIGGER `update_queue_after_insert` AFTER INSERT ON `encounter_note`
FOR EACH ROW
BEGIN -- <- BEGIN
DECLARE is_exist INT;
SET is_exist = ( SELECT count(*) FROM practice_last_updated_module WHERE practice_id = NEW.practice_id );
IF NEW.enc_source = 'OP' THEN
UPDATE practice_queue_list PQL
SET PQL.vital_check = IF (NEW.vs_weight <> 0 OR NEW.vs_height <> 0 OR NEW.vs_temperature <> 0 OR LENGTH(NEW.vs_blood_pressure) > 0 <> NEW.vs_pulse <> 0 OR NEW.vs_respiration <> 0, 1, 0)
WHERE PQL.encounter_id = NEW.id AND PQL.practice_place_id = NEW.practice_id;
END IF;
IF is_exist > 0 THEN
UPDATE practice_last_updated_module SET encounter = UNIX_TIMESTAMP(NOW()) where practice_id = NEW.practice_id;
-- ELSE:
ELSE
INSERT INTO practice_last_updated_module (practice_id, encounter) VALUES (NEW.practice_id, UNIX_TIMESTAMP(NOW()));
END IF;
END// -- <- END
DELIMITER ;