插入前的 DB2 触发器

Question

插入前的 DB2 触发器无法删除表中的行

CREATE TRIGGER WDW.user_name_search_del
before INSERT ON WDW.user_name_search_b
REFERENCING NEW AS new
FOR EACH ROW MODE DB2SQL
BEGIN ATOMIC
Delete from wdw.user_name_search_b
where user_name = new.user_name ;--

它正在抛出错误

在“name = new.user_name”之后发现了一个意外的标记“END-OF-STATEMENT”。预期的标记可能包括：“”.. SQLCODE=-104，SQLSTATE=42601，DRIVER=4.9.78 SQL 代码：-104，SQL 状态：42601

Answer 1

需要解决的两件事：

1. 将“BEGIN ATOMIC”更改为“BEGIN”。 “BEGIN ATOMIC”块不支持 DELETE
2. 在“;--”之前添加“;END”以结束“BEGIN”块。

声明应该是：

CREATE TRIGGER WDW.user_name_search_del 
  before INSERT ON WDW.user_name_search_b 
  REFERENCING NEW AS new 
  FOR EACH ROW 
  MODE DB2SQL 
BEGIN  
  Delete 
  from wdw.user_name_search_b 
  where user_name = new.user_name; 
END;