Question

如果表1中的记录数超过300条记录，请告诉我如何使Oracle存储过程失败？

我应该使用自定义异常处理吗？

Answer 1

CREATE OR REPLACE PROCEDURE test
IS
   D_count_exceeded   EXCEPTION;
   D_Count            NUMBER;
BEGIN
   SELECT COUNT (*) INTO d_count FROM your_table;

   IF D_count > 300 THEN
      RAISE D_Count_Exceeded;
   END IF;
END;

Answer 2

使用引发异常的触发器：

CREATE OR REPLACE TRIGGER TOO_MANY_RECS_TRIGGER
  BEFORE INSERT ON SOME_TABLE
  -- Note: *not* FOR EACH ROW
DECLARE
  nCount  NUMBER;
BEGIN
  SELECT COUNT(*)
    INTO nCount
    FROM SOME_TABLE;

  IF nCount >= 300 THEN
    RAISE_APPLICATION_ERROR(-20001, 'Too many records (' || nCount ||
                                    ') found in SOME_TABLE');
  END IF;
END TOO_MANY_RECS_TRIGGER;

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如何在表中的记录计数达到阈值时使Oracle存储过程失败

2 个答案: