在创建触发器时,MySQL 向我报告了此错误:
#1064 - You have an error in your SQL syntax; check the manual that corresponds
to your MariaDB server version for the right syntax to use near
'DECLARE cadhoc_total INT(1) UNSIGNED;
SET cadhoc_total = NEW.cadhoc_assigned + ' at line 2
这是代码:
DELIMITER $$
DROP TRIGGER IF EXISTS inviter_cadhoc $$
CREATE TRIGGER inviter_cadhoc BEFORE UPDATE ON inviter FOR EACH ROW
DECLARE cadhoc_total INT(1) UNSIGNED;
SET cadhoc_total = NEW.cadhoc_assigned + NEW.cadhoc_withdrew;
IF cadhoc_total > 5 THEN
SIGNAL SQLSTATE '45000' SET message_text = 'Bad update on inviter table: cadhoc must be 5 at maximum';
END IF;
IF NEW.cadhoc_withdrew < OLD.cadhoc_withdrew
SIGNAL SQLSTATE '45000' SET message_text = 'Bad update on inviter table: cannot restore withdrew cadhoc';
END IF;
IF NEW.cadhoc_assigned > OLD.cadhoc_assigned
SIGNAL SQLSTATE '45000' SET message_text = 'Bad update on inviter table: cannot restore assigned cadhoc';
END IF;
$$
DELIMITER ;
感兴趣的表格如下,其中有两个非常重要的字段:cadhoc_withdrew和cadhoc_assigned:它们的总和绝不能> 5。
CREATE TABLE IF NOT EXISTS Inviter (
nome VARCHAR(10) NOT NULL,
cognome VARCHAR(20) NOT NULL,
email VARCHAR(35) NOT NULL,
#normalizzare
cadhoc_assigned INT(1) NOT NULL DEFAULT 5,
cadhoc_withdrew INT(1) NOT NULL DEFAULT 0,
data_nascita DATE NOT NULL,
PRIMARY KEY (email)
) Engine=InnoDB;
最佳答案
将缺少的 THEN
添加到 IF
子句,并用 BEGIN/END
block 包装所有内容:
CREATE TRIGGER inviter_cadhoc BEFORE UPDATE ON inviter
FOR EACH ROW
BEGIN
DECLARE cadhoc_total INT(1) UNSIGNED;
SET cadhoc_total = NEW.cadhoc_assigned + NEW.cadhoc_withdrew;
IF cadhoc_total > 5 THEN
SIGNAL SQLSTATE '45000' SET message_text = 'Bad update on inviter table: cadhoc must be 5 at maximum';
END IF;
IF NEW.cadhoc_withdrew < OLD.cadhoc_withdrew THEN
SIGNAL SQLSTATE '45000' SET message_text = 'Bad update on inviter table: cannot restore withdrew cadhoc';
END IF;
IF NEW.cadhoc_assigned > OLD.cadhoc_assigned THEN
SIGNAL SQLSTATE '45000' SET message_text = 'Bad update on inviter table: cannot restore assigned cadhoc';
END IF;
END
关于mysql - #1064 - 在声明附近创建触发器时出现 MySQL 错误,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/33921273/