为插入或更新触发的语法正确的语法在db2

Question

从我能够收集到的东西，类似的事情应该起作用：

DROP TRIGGER trigger_check_customer_dob;
CREATE TRIGGER trigger_check_customer_dob
BEFORE INSERT OR UPDATE OF dob ON customers
REFERENCING NEW AS newrow
FOR EACH ROW
WHEN (newrow.dob > current_date - INTERVAL '22 years')
SIGNAL SQLSTATE '22007' ('Too young')
;

，但是，我会得到以下错误：

SQL错误[42601]：意外的令牌或更新“已找到”。
预期的令牌可能包括：“” .. sqlcode = -104，sqlstate = 42601，驱动程序=4.33.31

thttps：//www.ibm.com/docs/en/db2/11.1？

正确的语法是什么？ 我在Docker Image中运行DB2 12.1.1.0

MyDB2测试

SET CURRENT SCHEMA = 'DB2INST1';

创建桌子客户

CREATE TABLE CUSTOMERS
(
   ID INT GENERATED ALWAYS AS IDENTITY
     (START WITH 1 INCREMENT BY 1), 
   NAME VARCHAR(100),
   DOB DATE,
   PRIMARY KEY (ID)
);

Answer 1

Change sqlstate至75022。

insert触发

CREATE TRIGGER TRIGGER_CHECK_CUSTOMER_DOB_LESS22_INSERT
    NO CASCADE BEFORE INSERT ON CUSTOMERS
    REFERENCING NEW AS N_ROW
    FOR EACH ROW
    WHEN (YEAR(CURRENT DATE) - YEAR(N_ROW.DOB) < 22)
    BEGIN ATOMIC
        SIGNAL SQLSTATE '75022' 
        SET MESSAGE_TEXT = 'Too young';
    END;

• update触发

  CREATE TRIGGER TRIGGER_CHECK_CUSTOMER_DOB_LESS22_UPDATE
      NO CASCADE BEFORE UPDATE OF DOB ON CUSTOMERS
      REFERENCING NEW AS N_ROW
      FOR EACH ROW
      WHEN (YEAR(CURRENT DATE) - YEAR(N_ROW.DOB) < 22)
      BEGIN ATOMIC
          SIGNAL SQLSTATE '75022' 
          SET MESSAGE_TEXT = 'Too young';
      END;

  非正常插入数据

INSERT INTO CUSTOMERS ( NAME, DOB) VALUES
( 'Alice', DATE '2000-05-15'),
( 'DOB', DATE '1995-08-20'),
( 'Charlie', DATE '1998-12-10'),
( 'David', DATE '1999-03-25'),
( 'Eve', DATE '2001-07-30');

• 测试插入触发失败
  INSERT INTO CUSTOMERS ( NAME, DOB) VALUES ('Frank', DATE '2005-10-05');
get结果：

SQL ERROR [75022]: Application raised error or warning with diagnostic text: "Too young".. SQLCODE=-438, SQLSTATE=75022, DRIVER=4.33.31

测试更新触发失败

UPDATE CUSTOMERS SET DOB = DATE '2006-02-15' WHERE ID = 1;

get结果：

SQL ERROR [75022]: Application raised error or warning with diagnostic text: "Too young".. SQLCODE=-438, SQLSTATE=75022, DRIVER=4.33.31