Question

运行时：

   DELIMITER $$ 
CREATE TRIGGER tr_test BEFORE UPDATE ON test
     FOR EACH ROW
      BEGIN
      DECLARE EXIT HANDLER FOR SQLSTATE '45000';
      DECLARE EXIT HANDLER FOR SQLSTATE '23000';
      IF(older_record(NEW.last_action_timestamp, OLD.last_action_timestamp)) THEN
           SET @rowhash = (SELECT MD5(NEW));
           INSERT INTO test_db.test_table SELECT NEW.*, @rowhash;
           SIGNAL SQLSTATE '45000' SET MESSAGE_TEXT = 'old record'; 
      END IF 
      END
      $$
DELIMITER ;

我收到以下错误消息：

您的SQL语法有错误;查看与您的＆gt; MariaDB服务器版本对应的手册，以便在＆＃39 ;;附近使用正确的语法; DECSTARE EXIT HANDLER for SQLSTATE＆＃39; 23000＆＃39 ;; IF（old_record（NEW.l＆＃39;第4行
）

Answer 1

DECLARE语句后面必须跟一个＆＃34;语句＆＃34; - 见https://dev.mysql.com/doc/refman/5.6/en/declare-handler.html 也许你想要的只是

BEGIN END;

显然是一个空洞的陈述＆＃34;是不允许的？

无法为sqlstates声明两个处理程序

1 个答案: