Question

我有一个plsql过程来删除子表和父表中的记录。

我想在找到儿童记录时提出异常。

我该怎么做？

CREATE OR REPLACE PROCEDURE myproc(
    p_id       number,
    p_id2      number,
    p_par3      number)
AS
BEGIN
 DELETE FROM   child_table
            WHERE   id1 = p_id and par=p_par3;

    DELETE FROM   parent_table
            WHERE   no = p_id2;
COMMIT;

EXCEPTION   
    WHEN OTHERS
    THEN
        --raise
END myproc;
/

Answer 1

如果您不想捕获异常，请删除异常块！

CREATE OR REPLACE PROCEDURE myproc(p_id NUMBER, p_id2 NUMBER, p_par3 NUMBER) AS
BEGIN
   DELETE FROM child_table
    WHERE id1 = p_id
      AND par = p_par3;

   DELETE FROM parent_table WHERE no = p_id2;
   COMMIT; /* do you really want to commit in a procedure? */
END myproc;

您无需全部捕捉它们（exceptions are not pokemon）。如果您真的坚持要抓住并重新加注，可以使用RAISE或RAISE_APPLICATION_ERROR：

EXCEPTION
   WHEN OTHERS THEN
      raise_application_error(-20001 /* user-defined exception number 
                                        between -20999 and -20000 */,
                              'your user-defined exception message',
                              TRUE /* this will preserve the error stack */
                              );
END;

如果您想要更具体并且仅捕获子异常，则必须define the exception编号，因为此错误在PL / SQL中没有predefined exception：

CREATE OR REPLACE PROCEDURE myproc(p_id NUMBER, p_id2 NUMBER, p_par3 NUMBER) AS
   child_exists EXCEPTION;
   PRAGMA EXCEPTION_INIT(child_exists, -2292); /* raises ORA-02292 */
BEGIN
   DELETE FROM child_table
    WHERE id1 = p_id
      AND par = p_par3;

   DELETE FROM parent_table WHERE no = p_id2;
   COMMIT; /* do you really want to commit in a procedure? */

EXCEPTION
   WHEN child_exists THEN
      -- do something
      RAISE;
END myproc;

Answer 2

我想在找到儿童记录时提出异常

create or replace procedure myproc(p_id number, p_id2 number, p_par3 number)
as
begin

   delete from child_table
    where id1 = p_id
      and par = p_par3;

   if sql%rowcount > 0 then
      raise_application_error(-20001, 'Child record(s) found!');
   end if;

   delete from parent_table where no = p_id2;

end myproc;

HTH。

的Alessandro

PS：修改了我的阅读理解缺陷的答案，我认为你没有找到儿童记录时你想要和异常。

找到子记录时引发异常

2 个答案: