Question

我要在xampp中创建一个触发器。

CREATE TRIGGER testref BEFORE INSERT ON test1
FOR EACH ROW 
BEGIN
INSERT INTO test2 SET a2 = NEW.a1;
DELETE FROM test3 WHERE a3 = NEW.a1;
UPDATE test4 SET b4 = b4 + 1 WHERE a4 = NEW.a1;
END;

但我有错误：

CREATE TRIGGER testref BEFORE INSERT ON test1
    FOR EACH
    ROW
    BEGIN
    INSERT INTO test2
    SET a2 = NEW.a1;

MySQL said: Documentation
#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

之前，我创建了4个表：

CREATE TABLE test1(a1 INT);
CREATE TABLE test2(a2 INT);
CREATE TABLE test3(a3 INT NOT NULL AUTO_INCREMENT PRIMARY KEY);
CREATE TABLE test4(
  a4 INT NOT NULL AUTO_INCREMENT PRIMARY KEY,
  b4 INT DEFAULT 0
);

请帮帮我。谢谢你！

Answer 1

首先更改分隔符，否则过程中的分号会破坏语法。请参阅MySQL文档中此page on creating procedures的一半示例（下面复制以节省时间）。

mysql> delimiter //

mysql> CREATE PROCEDURE simpleproc (OUT param1 INT)
    -> BEGIN
    ->   SELECT COUNT(*) INTO param1 FROM t;
    -> END//
Query OK, 0 rows affected (0.00 sec)

mysql> delimiter ;

mysql> CALL simpleproc(@a);
Query OK, 0 rows affected (0.00 sec)

mysql> SELECT @a;
+------+
| @a   |
+------+
| 3    |
+------+
1 row in set (0.00 sec)

更新：或许以下......

DELIMITER //
CREATE TRIGGER testref BEFORE INSERT ON test1
FOR EACH ROW 
BEGIN
INSERT INTO test2 SET a2 = NEW.a1;
DELETE FROM test3 WHERE a3 = NEW.a1;
UPDATE test4 SET b4 = b4 + 1 WHERE a4 = NEW.a1;
END//
DELIMITER ;

Answer 2

看看你的phpmyadmin版本中是否有DILIMITER字段，就在SQL编辑器下面。在那里设置分隔符，例如 - '$$'，并编写此SQL代码 -

CREATE TRIGGER testref BEFORE INSERT ON test1
FOR EACH ROW 
BEGIN
INSERT INTO test2 SET a2 = NEW.a1;
DELETE FROM test3 WHERE a3 = NEW.a1;
UPDATE test4 SET b4 = b4 + 1 WHERE a4 = NEW.a1;
END$$

如果你的phpmyadmin没有这个选项（它可以是旧版本），并且如果可以使用其他工具连接到服务器，那么尝试使用另一个MySQL客户端，例如： - dbForge Studio for MySQL（免费快递版）。

Answer 3

使用以下命令创建触发器

delimiter |
CREATE TRIGGER testref BEFORE INSERT ON test1
FOR EACH ROW 
BEGIN
INSERT INTO test2 SET a2 = NEW.a1;
DELETE FROM test3 WHERE a3 = NEW.a1;
UPDATE test4 SET b4 = b4 + 1 WHERE a4 = NEW.a1;
END;
|

那是......你必须使用分隔符..

分隔符用于定义查询的结尾。默认情况下，它是半列（;）。这里我们使用DELIMITER命令来更改默认分隔符，以便我们可以使用';' insdie触发器定义

在MySql 5.5.27中创建触发器时出错

3 个答案: