Question

我编写了一个程序，它使用游标来更新这些表中的某些行 - 这是程序：

DECLARE
   -- Local variables here
   CURSOR s
   IS
      (SELECT UNIQUE *
         FROM Sellers
        WHERE ID_Seller NOT IN (SELECT ID_Seller
                                  FROM Sellers NATURAL JOIN Sales));

   s_rec   Sellers%ROWTYPE;
BEGIN
   -- Test statements here
   OPEN s;

   LOOP
      FETCH s INTO s_rec;

      EXIT WHEN s%NOTFOUND;
      DBMS_OUTPUT.put_line (s_rec.ID_Seller);
      DBMS_OUTPUT.put_line (s_rec.Salary);
      updateSalary (s_rec.ID_Seller, s_rec.Salary - 50);
   END LOOP;

   CLOSE s;
END;

这是程序updateSalary：

CREATE OR REPLACE PROCEDURE updateSalary (ID_S        IN VARCHAR2,
                                          newSalary   IN FLOAT)
IS
BEGIN
   UPDATE Sellers s
      SET s.salary = newSalary
    WHERE s.ID_Seller = ID_S;
END updateSalary;

运行程序时，它会遇到更新命令。该程序有什么问题？

Answer 1

为了更新游标内的表格，你需要在“FOR UPDATE”模式下打开游标，添加到你的查询“FOR UPDATE”：

(SELECT UNIQUE *
     FROM Sellers
    WHERE ID_Seller NOT IN (SELECT ID_Seller
                              FROM Sellers NATURAL JOIN Sales) FOR UPDATE);

Answer 2

You need to add **FOR UPDATE** IN CURSOR TO UPDATE THE TABLE

pl / sql更新过程与光标卡住

2 个答案: