Question

根据phpmyadmin，我在此触发器中出现语法错误：

CREATE TRIGGER insert_device
AFTER INSERT ON table_e
FOR EACH ROW

BEGIN

DECLARE m_id_a INTEGER;
DECLARE m_id_d INTEGER;
m_id_d := 0;

SELECT id_a INTO m_id_a FROM table_ua WHERE ua_eui = NEW.eui LIMIT 1;

SELECT id_d INTO m_id_d FROM table_d WHERE d_idapp = m_id_a ORDER BY id asc LIMIT 1;
IF (m_id_d == 0) THEN
    INSERT INTO table_d (d_addr, d_eui, d_apps, d_nwks, d_idapp)
    VALUE (NEW.addr, NEW.eui, NEW.apps, NEW.nwks, m_id_a);
ELSE
    UPDATE TABLE table_d
    SET
      d_addr = NEW.addr,
      d_eui = NEW.eui,
      d_apps = NEW.apps,
      d_nwks = NEW.nwks
    WHERE id_d = m_id_d;
END IF;

END

错误是：

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 ':= 0;

错误是什么？我不明白我做错了什么..

感谢。

Answer 1

触发器中存在多个语法错误：

declare变量，您应该使用set;
IF表达式不能使用==，只有一个是正确的;
update语法只需指定表名称UPDATE table_d SET ...。

所以请尝试以下触发器：

delimiter $$
CREATE TRIGGER insert_device
AFTER INSERT ON table_e
FOR EACH ROW

BEGIN

DECLARE m_id_a INTEGER;
DECLARE m_id_d INTEGER;
set m_id_d = 0;
SELECT id_a INTO m_id_a FROM table_ua WHERE ua_eui = NEW.eui LIMIT 1;

SELECT id_d INTO m_id_d FROM table_d WHERE d_idapp = m_id_a ORDER BY id asc LIMIT 1;
IF (m_id_d = 0) THEN
    INSERT INTO table_d (d_addr, d_eui, d_apps, d_nwks, d_idapp)
    VALUE (NEW.addr, NEW.eui, NEW.apps, NEW.nwks, m_id_a);
ELSE
    UPDATE table_d
    SET
      d_addr = NEW.addr,
      d_eui = NEW.eui,
      d_apps = NEW.apps,
      d_nwks = NEW.nwks
    WHERE id_d = m_id_d;
END IF;

END
$$

错误mysql语法触发器

1 个答案: