我在插入employee表之前创建了一个触发器来计算它的年龄,但是尝试插入employee表返回以下错误错误代码:1442。无法在存储函数中更新表'employee'/触发器,因为它已被调用此存储函数/触发器的语句使用
CREATE TABLE IF NOT EXISTS person (
ssn INT(20) NOT NULL,
name_person VARCHAR(200) NOT NULL,
birth_date DATE NOT NULL,
PRIMARY KEY (ssn))
ENGINE = InnoDB;
CREATE TABLE IF NOT EXISTS employee (
ssn_employee INT(20) NOT NULL,
job_title VARCHAR(100) NOT NULL,
age INT(10) DEFAULT NULL,
PRIMARY KEY(ssn_employee),
FOREIGN KEY (ssn_employee)
REFERENCES person (ssn)
ON UPDATE CASCADE)
ENGINE = InnoDB;
DELIMITER $$
CREATE TRIGGER employeeAge
BEFORE INSERT ON employee
FOR EACH ROW
BEGIN
DECLARE dob DATE;
DECLARE ssn_employee1 int;
SELECT new.ssn_employee INTO ssn_employee1;
SELECT person.birth_date into dob FROM person WHERE ssn = ssn_employee1;
UPDATE employee
SET new.age = DATEDIFF(dob, GETDATE());
END
DELIMITER;$$
答案 0 :(得分:0)
谢谢各位。我是初学者,提示已澄清。我这样做了:
```lang_sql
DELIMITER $$
CREATE TRIGGER employeeAge
BEFORE INSERT ON employee
FOR EACH ROW
BEGIN
DECLARE dob DATE;
DECLARE ssn_employee1 int;
SELECT new.ssn_employee INTO ssn_employee1;
SELECT person.birth_date into dob FROM person WHERE ssn = ssn_employee1;
SET new.age = TIMESTAMPDIFF(YEAR, dob, NOW());
END;
DELIMITER $$