Question

ALTER TABLE student ADD gpa NUMBER;
CREATE OR REPLACE TRIGGER "USER36401"."GETGPA" AFTER
  DELETE OR
  INSERT OR
  UPDATE ON grade_report FOR EACH row DECLARE totalqp NUMBER :=0;

  totalgpa      NUMBER :=0;
  totalcreds    NUMBER :=0;
  prevqp        NUMBER :=0;
  prevgpa       NUMBER :=0;
  prevcreds     NUMBER :=0;
  incomingqp    NUMBER :=0;
  incominggpa   NUMBER :=0;
  incomingcreds NUMBER :=0;
  temp          NUMBER :=0;
  BEGIN
    CASE
    WHEN updating THEN
      UPDATE student SET student.gpa = NVL(student.gpa,0);
      SELECT student.gpa
      INTO temp
      FROM student
      WHERE student.student_number = :NEW.student_Number;
      IF temp                      <1 THEN
        totalqp                   := temp;
        SELECT DISTINCT DECODE(:NEW.GRADE,'A','4','B','3','C','2','D','1','F','0')
        INTO temp
        FROM student,
          section,
          course
        WHERE :NEW.student_number   = student.student_number
        AND :NEW.section_identifier = section.section_identifier
        AND section.course_number   = course.course_number;
        UPDATE student
        SET student.gpa              = temp
        WHERE student.student_number = :NEW.student_number;
      ELSE
        prevgpa := temp;
        SELECT student.total_credit_hours
        INTO temp
        FROM student
        WHERE student.student_number = :NEW.student_number;

        prevcreds := temp;
        SELECT DISTINCT course.credit_hours
        INTO temp
        FROM course,
          section
        WHERE course.course_number    = section.course_number
        AND section.section_identifier= :NEW.section_identifier;
        --current
        SELECT DISTINCT course.credit_hours
        INTO temp
        FROM course,
          section
        WHERE course.course_number    = section.course_number
        AND section.section_identifier= :NEW.section_identifier;

        incomingcreds := temp;
        prevcreds     := prevcreds - incomingcreds;
        prevqp        := prevgpa   * prevcreds;
        --total quality points before add
        SELECT DECODE(:NEW.GRADE,'A','4','B','3','C','2','D','1','F','0')
        INTO temp
        FROM student,
          section,
          course
        WHERE :NEW.student_number   = student.student_number
        AND :NEW.section_identifier = section.section_identifier
        AND section.course_number   = course.course_number;

        incominggpa := temp;
        --gpa being added before quality points
        SELECT DISTINCT course.credit_hours
        INTO temp
        FROM course,
          section
        WHERE course.course_number    = section.course_number
        AND section.section_identifier= :NEW.section_identifier;

        incomingqp := incominggpa*incomingcreds;
        totalqp    := prevqp     + incomingqp;
        totalcreds := prevcreds  + incomingcreds;
        totalgpa   := totalqp    / totalcreds;
        UPDATE student
        SET gpa                      = totalgpa
        WHERE student.student_number = :NEW.student_number;
      END IF;
    WHEN DELETING then
    Select * from student where student.student_number = :NEW.student_number;
    END CASE;
  END;

目标是触发器在删除时执行“某些[尚未实现]”。

当我编译时，它表示编译，但警告有错误。我被淘汰为决赛周，这是最后一个项目。我无法找到它所处的错误，我确信它是一种语法，我没有发现。非常感谢任何帮助。

编辑：另外，我知道这可能是实现我想要做的事情最无效的方式。但我的代码完全基于教授列出的内容，我们可以在课堂上的powerpoint幻灯片中使用。而且坦率地说，这是我的小专业，而且我是一名大四学生，所以我并不在乎。我只是需要它才能工作。

EDIT3：

来自编译触发器脚本：ALTER TABLE学生成功了。警告：执行完成并发出警告 TRIGGER“USER36401”。“GETGPA”已编译。

insert into grade_report values ('17','112','B');
select * from student;
insert into grade_report values ('17','119','C');
select * from student;
insert into grade_report values ('8','85','A');
select * from student;
insert into grade_report values ('8','92','A');
select * from student;
insert into grade_report values ('8','102','B');
select * from student;
insert into grade_report values ('8','135','A');

返回错误：“在命令的第1行开始出错：插入grade_report值（'17'，'112'，'B'）命令行出错：1列：12 错误报告： SQL错误：ORA-04098：触发器“USER36401.GETGPA”无效且重新验证失败 04098. 00000 - “触发'％s。％s'无效且重新验证失败” *原因：尝试检索触发器以执行并且是发现无效。这也意味着编译/授权触发器失败了。 *行动：选项是解决编译/授权错误，禁用触发器，或放下触发器。“

Answer 1

你最后一个select语句（在案例的'delete'分支中），并没有'INTO子句。此外，您使用SELECT *，而您需要指定要在变量中选择的确切字段。

你在案件的另一个分支做同样的事情，为什么不看那个？

警告：编译但在sql developer中触发了编译错误

1 个答案: