Question

我有三个具有以下各列的表：

员工：员工编号，total_project_budget
项目：Project_ID，预算
正在使用：Employee_ID，Project_ID

将行插入WorkingOn表时，我试图在Oracle中创建行级触发器。它将获得项目预算的总和，并更新为员工正在从事的员工的total_project_budget。

我当前的行级别触发器：

CREATE OR REPLACE TRIGGER testtrigger
AFTER INSERT ON WorkingOn
FOR EACH ROW
  BEGIN
    UPDATE employee
    SET TOTAL_BUDGET = ( SELECT SUM(budget)
                         FROM project INNER JOIN workingon
                         ON project.project_id = workson.project_id
                         WHERE workingon.employee_id = employee.employee_id )
    WHERE employee_id = :NEW.employee_id;
  END;
/

如果运行此触发器，我会得到一个突变表，

ORA-04091：表用户。WORKINGON正在变异，触发器/函数可能看不到

但是如果我使用AUTONOMOUS_TRANSACTION，

ORA-06519：检测到活动的自主事务并回滚

编辑：

为了澄清， WorkingOn：Employee_ID引用Employee.employee_ID，Project_ID引用Project.project_ID。

Employee-（1 to 1）-> WorkingOn-（1 to *）-> Project

Answer 1

我建议仅在项目表上使用总和，如下所示：

CREATE OR REPLACE TRIGGER testtrigger
AFTER INSERT ON WorkingOn
FOR EACH ROW
  BEGIN
    UPDATE employee
    SET TOTAL_BUDGET = ( SELECT SUM(budget)
                         FROM project 
                        WHERE project.project_id = :NEW.project_id)
    WHERE employee_id = :NEW.employee_id;
  END;
/

干杯！

Oracle：行级触发器，用于将行插入表中并更新另一个表的列

1 个答案: