MySQL #1064 : declare a variable

Question

我需要在 MySQL 中声明变量。这是我到目前为止所拥有的。

CREATE TRIGGER upd
BEFORE UPDATE ON chats FOR EACH ROW
BEGIN
    DECLARE my_cursor CURSOR FOR SELECT name FROM messages;
END

从逻辑上讲，它接缝不错。但是有一个奇怪的错误 即

SQL查询:

CREATE TRIGGER upd
    BEFORE UPDATE ON chats FOR EACH ROW
    BEGIN
        DECLARE my_cursor CURSOR FOR SELECT name FROM messages;

MySQL 说:

#1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 4 

Answer 1

这行得通。当它被欺骗关闭时，将很乐意将其删除。

它只是缺少分隔符包装 block 。

drop trigger if exists upd;

delimiter $$
CREATE TRIGGER upd
BEFORE UPDATE ON chats FOR EACH ROW
BEGIN
    DECLARE vapenid INT;
END;
$$
delimiter ;