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我的觸發器位於此處。如何在插入觸發器(Mysql)後在條件基礎上聲明遊標
mysql> CREATE TRIGGER `trg_after_insert` AFTER INSERT ON `tbl_demo`
-> FOR EACH ROW
-> BEGIN
-> DECLARE `done` BOOL DEFAULT FALSE;
-> DECLARE `_id` INT;
-> DECLARE `_value` VARCHAR(50);
->
-> DECLARE `demo_cursor` CURSOR FOR
-> SELECT * -- <- SELECT `id`, `value` Recommendation for use
-> FROM `tbl_demo`
-> WHERE `id` = NEW.`id`;
-> DECLARE CONTINUE HANDLER FOR NOT FOUND SET `done` := TRUE;
->
-> OPEN `demo_cursor`;
->
-> `read_loop`: LOOP
-> FETCH `demo_cursor` INTO `_id`, `_value`;
->
-> IF `done` THEN
-> CLOSE `demo_cursor`;
-> LEAVE `read_loop`;
-> END IF;
->
-> INSERT INTO `result_demo`
-> (`id`, `value`)
-> VALUES
-> (`_id`, `_value`);
-> END LOOP;
-> END//
我要申報demo_cusror按新字段值類似
if NEW.`id`=NULL THEN
DECLARE `demo_cursor` CURSOR FOR SELECT * tbl_demo ;
ELSE
DECLARE `demo_cursor` CURSOR FOR SELECT * tbl_demo2;
END IF
我試過,但我不能把if條件的聲明部分。