Question

我试图在更新后构建一个简单的触发器来更新另一个表，但我在这里找不到语法错误。要做到这一点，我将使用phpMyAdmin向导。

错误：

MySQL：＃1064 - 您的SQL语法出错;检查手册对应于您的MySQL服务器版本，以获得正确的语法在'UPDATE question SET question.fname_author = new.fname附近使用，第4行的问题.lname_au'

TABLES STRUCTURE:

  question             user_question         users

 - id PK               -id_user PFK         -id  PK
 - fname_author        -id_question PFK     -fname
 - lname_author        -fname_author FK     -lname 
 - question            -lname_author FK     -email  
 - category            -question FK         -office
 - level               -office FK           -password
 - created_at          -created_at          -created_at 
 - updated_at          -updated_at          -updated_at

CREATE TRIGGER `TAU_users_UPDATE_dati_domanda` AFTER UPDATE ON `users` 
FOR EACH ROW
     BEGIN
            SET @id_question = (SELECT user_question.id_question
                               FROM user_question
                               WHERE user_question.id_user =new.id);
            UPDATE question
            SET
                fname_author = new.fname,
                lname_author = new.lname
        WHERE question.id = @id_question
END;

Answer 1

尝试改变：

CREATE TRIGGER `TAU_users_UPDATE_dati_domanda` AFTER UPDATE ON `users` 
FOR EACH ROW
     BEGIN
            SET @id_question = (SELECT user_question.id_question
                               FROM user_question
                               WHERE user_question.id_user =new.id)
            UPDATE question
            SET
                question.fname_author = new.fname,
                question.lname_author = new.lname


        WHERE question.id = @id_question
END;

在：

delimiter //
CREATE TRIGGER `TAU_users_UPDATE_dati_domanda` AFTER UPDATE ON `users` 
FOR EACH ROW
     BEGIN
            SET @id_question = (SELECT user_question.id_question
                               FROM user_question
                               WHERE user_question.id_user =new.id);
            UPDATE question
            SET
                fname_author = new.fname,
                lname_author = new.lname
        WHERE question.id = @id_question;
END;//
delimiter ;

有关触发器的语法和示例，请参阅：http://dev.mysql.com/doc/refman/5.6/en/trigger-syntax.html以及有关使用BEGIN ... END内部触发器的相关注释。

Answer 2

@Renzo提供的答案应该有效......

我正在尝试使用一些测试数据测试o / p代码......通常为时已晚......

无论如何，无论如何我都会发布它......

所以我创建了一个带有一些测试数据的SQLFddle。

触发码：

CREATE TRIGGER `TAU_users_UPDATE_dati_domanda` AFTER UPDATE ON `users` 
FOR EACH ROW
     BEGIN
            SET @id_question = (SELECT user_question.id_question
                               FROM user_question
                               WHERE user_question.id_user =new.id);

            UPDATE question
            SET
                question.fname_author = new.fname,
                question.lname_author = new.lname
        WHERE question.id = @id_question;
END;//

不重要 - 请注意：update中的合格列名称。

之前的测试数据：

用户：

id  fname             lname             email           office      password Created_at
1   fname_u1          lname_u1          u1@here.com     office_u1   pwd_u1   September, 17 2015 11:57:11
2   fname_u2          lname_u2          u2@here.com     office_u2   pwd_u2   September, 17 2015 11:57:12

问题：

id  fname_author      lname_author      question           category level created_at
1   fname_q1          lname_q1          what question q1?  cat_1    1     September, 17 2015 11:57:12
2   fname_u2          lname_u2          what question q2?  cat_2    2     September, 17 2015 11:57:12

更新声明：

UPDATE  users 
SET users.fname = 'fname_u2_new_fn01',
    users.lname = 'lname_u2_new_fn01'
WHERE users.id = 2//

更新后的测试数据：

用户：

id  fname             lname             email           office      password Created_at
1   fname_u1          lname_u1          u1@here.com     office_u1   pwd_u1   September, 17 2015 11:57:11
2   fname_u2_new_fn01 lname_u2_new_fn01 u2@here.com     office_u2   pwd_u2   September, 17 2015 11:57:12

问题：

id  fname_author      lname_author      question           category level created_at
1   fname_q1          lname_q1          what question q1?  cat_1    1     September, 17 2015 11:57:12
2   fname_u2_new_fn01 lname_u2_new_fn01 what question q2?  cat_2    2     September, 17 2015 11:57:12

触发AFTER更新语法错误

2 个答案: