Question

我在mysql触发器中声明了一些变量

DELIMITER //
CREATE TRIGGER lestrigger
    AFTER INSERT ON examinations
   FOR EACH ROW
  BEGIN
    DECLARE the_last_inserted_id INT ;
    DECLARE the_class_id INT;
    DECLARE the_year_id INT;

    SET the_last_inserted_id = LAST_INSERT_ID();
    SET the_class_id = select examination_class_id from examinations where examination_id = the_last_inserted_id;
    SET the_year_id = select examination_class_year_id from examinations where examination_id = the_last_inserted_id;

    insert into examination_data (ed_cs_id,ed_examination_id) select cs_id from class_students where cs_class_id = the_class_id AND cs_year_id = the_year_id,the_last_inserted_id;

END
  //
DELIMITER ;

但我一直收到此错误

/ * SQL错误（1064）：您的SQL语法有错误;检查手册，对应右边的MySQL服务器版本在考试中选择'select examination_class_id'附近使用的语法其中exam_id = the_last_in'在第10行* /

我在语法上使用我的变量的方式是正确的吗？

Answer 1

使用INTO关键字http://dev.mysql.com/doc/refman/5.0/en/select-into.html

select examination_class_id into the_class_id from examinations where examination_id = the_last_inserted_id;
select examination_class_year_id into the_year_id from examinations where examination_id = the_last_inserted_id;

在触发器中声明和使用变量

1 个答案: