sqlite 不支持 IF-THEN-ELSE 等
控制结构语句没有？那我怎么写触发器！

[解决办法]
没办法，SQLITE本身功能的限制。毕竟是免费开发的，并且是基于文件的。
[解决办法]
sql-statement ::=CREATE [TEMP | TEMPORARY ] TRIGGER trigger-name [ BEFORE | AFTER ]
database-event ON [database-name . ] table-name
trigger-action
sql-statement ::=CREATE [TEMP | TEMPORARY ] TRIGGER trigger-name INSTEAD OF
database-event ON [database-name . ] view-name
trigger-action
database-event ::=DELETE |
INSERT |
UPDATE |
UPDATE OF column-list
trigger-action ::=[ FOR EACH ROW | FOR EACH STATEMENT ] [ WHEN expression ]
BEGIN
trigger-step ; [ trigger-step ; ]*
END

在WHEN中写条件试试
[解决办法]
呵呵，没办法，SQLITE不支持IF-THEN-ELSE