在if語句上觸發語法錯誤

Question

由於語法錯誤，Mysql不會允許我創建以下觸發器，我認爲按照我編寫的if語句的方式，任何人都可以幫助確定這應該看起來像什麼嗎？

DELIMITTER $$ 
CREATE TRIGGER gl_bal_upd_update AFTER UPDATE ON journal_line 
FOR EACH ROW 
BEGIN 
DECLARE curr varchar(10); 
DECLARE period varchar(10); 

select period_name,currency 
into period,curr 
from journal_header jh 
where jh.journal_header_id = NEW.journal_header_id; 

INSERT IGNORE INTO general_ledger_balance (account_comb_id,period_name)values(NEW.account_comb_id,period); 

UPDATE general_ledger_balance glb 
SET glb.debit = IF(NEW.debit + glb.debit - OLD.debit - NEW.credit - glb.credit + OLD.credit > 0, NEW.debit + glb.debit - OLD.debit - NEW.credit - glb.credit + OLD.credit,0)(
,glb.credit = IF(NEW.credit + glb.credit - OLD.credit -NEW.debit - glb.debit + OLD.debit > 0, NEW.credit + glb.credit - OLD.credit - NEW.debit - glb.debit + OLD.debit,0) 
,glb.currency = curr 
WHERE glb.account_comb_id = NEW.account_comb_id 
AND glb.period_name = period; 

END $$ 

DELIMITER ; 

Answer 1

您的分隔符拼寫錯誤，在行末尾隨機加上左括號。試試這個，它通過語法錯誤得到：

DELIMITER $$ 
CREATE TRIGGER gl_bal_upd_update AFTER UPDATE ON journal_line 
FOR EACH ROW 
BEGIN 
DECLARE curr varchar(10); 
DECLARE period varchar(10); 

select period_name,currency 
into period,curr 
from journal_header jh 
where jh.journal_header_id = NEW.journal_header_id; 

INSERT IGNORE INTO general_ledger_balance (account_comb_id,period_name)values(NEW.account_comb_id,period); 

UPDATE general_ledger_balance glb 
SET glb.debit = IF(NEW.debit + glb.debit - OLD.debit - NEW.credit - glb.credit + OLD.credit > 0, NEW.debit + glb.debit - OLD.debit - NEW.credit - glb.credit + OLD.credit,0) 
,glb.credit = IF(NEW.credit + glb.credit - OLD.credit -NEW.debit - glb.debit + OLD.debit > 0, NEW.credit + glb.credit - OLD.credit - NEW.debit - glb.debit + OLD.debit,0) 
,glb.currency = curr 
WHERE glb.account_comb_id = NEW.account_comb_id 
AND glb.period_name = period; 

END $$ 
DELIMITER ;