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我一直在调试一个 SQL 存储过程，它必须根据表 C 中存在的值（ID）从表 A 中获取值（在我的代码 ID 和 Numb 中），然后将 Numb 平方并将其存储在表 B 中，即所有事物 ID、Numb 和 Square。我无法在下面的代码中找出问题

 DELIMITER $$
    CREATE PROCEDURE matlab.squaring
     BEGIN
       DECLARE finish BOOLEAN DEFAULT 0; # <- set up initial conditions
       DECLARE square BIGINT(10);
       DECLARE ID INT(10);
       DECLARE Numb INT (10);
       DECLARE id_cur CURSOR FOR
         SELECT ID, Numb FROM A WHERE EXISTS ( SELECT ID FROM c);
         SET @square= @Numb * @Numb

           INSERT INTO B
           (
             ID ,
             Numb ,
             square
           )     values ( ID , Numb, square);


       DECLARE CONTINUE HANDLER FOR NOT FOUND SET finish = TRUE;
       OPEN id_cur;

     the_loop : LOOP
        FETCH id_cur INTO ID;

        IF finish THEN
           CLOSE id_cur;
           LEAVE the_loop;
        END IF
    END LOOP the_loop;
    END$$

当我运行存储过程时，弹出的错误是“您的代码中似乎有一些语法错误，请参考MYSql指南。”

编辑：请提供更多帮助，请如何执行此存储过程。

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3 回答 3

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  • 您在 PROCEDURE matlab 之后错过了 () ...
  • 和 ; 在 END IF 之后
  • 此外，HANDLER 声明应该在任何可执行代码之前和 CURSOR 声明之后
  • SET @square= @Numb * @Numb 后的分号是必需的

所以，查询应该是这样的：

    DELIMITER $$
CREATE PROCEDURE matlab.squaring ()
 BEGIN
   DECLARE finish BOOLEAN DEFAULT 0; # <- set up initial conditions
   DECLARE square BIGINT(10);
   DECLARE ID INT(10);
   DECLARE Numb INT (10);
   DECLARE id_cur CURSOR FOR
     SELECT ID, Numb FROM A WHERE EXISTS ( SELECT ID FROM c);
   DECLARE CONTINUE HANDLER FOR NOT FOUND SET finish = TRUE;
     SET @square= @Numb * @Numb;

       INSERT INTO B
       (
         ID ,
         Numb ,
         square
       )     values ( ID , Numb, square);

   OPEN id_cur;

 the_loop : LOOP
    FETCH id_cur INTO ID;

    IF finish THEN
       CLOSE id_cur;
       LEAVE the_loop;
    END IF;
END LOOP the_loop;
END$$
于 2013-06-03T09:19:07.197 回答
0

endif 处缺少参数括号和分号。

DELIMITER $$
    CREATE PROCEDURE squaring()
     BEGIN
       DECLARE finish BOOLEAN DEFAULT 0; # <- set up initial conditions
       DECLARE square BIGINT(10);
       DECLARE ID INT(10);
       DECLARE Numb INT (10);
       DECLARE id_cur CURSOR FOR
       SELECT ID, Numb FROM A WHERE EXISTS ( SELECT ID FROM c);
       DECLARE CONTINUE HANDLER FOR NOT FOUND SET finish = TRUE;
       SET @square= @Numb * @Numb;

           INSERT INTO B
           (
             ID ,
             Numb ,
             square
           )     values ( ID , Numb, square);


       OPEN id_cur;

     the_loop : LOOP
        FETCH id_cur INTO ID;

        IF finish THEN
           CLOSE id_cur;
           LEAVE the_loop;
        END IF;
    END LOOP the_loop;
    END$$
于 2013-06-03T09:19:34.930 回答
0

有各种小错误；

您需要一个参数列表，即使该过程为空；

CREATE PROCEDURE matlab.squaring()

continue 处理程序必须位于其他声明的正下方；

   DECLARE id_cur CURSOR FOR
     SELECT ID, Numb FROM A WHERE EXISTS ( SELECT ID FROM c);
   DECLARE CONTINUE HANDLER FOR NOT FOUND SET @finish = TRUE;

你忘了分号；

SET @square= @Numb * @Numb;

你忘记了变量用法上的@；

   )     values ( @ID , @Numb, @square);

您在 END IF 上忘记了分号

    END IF;

作为概述，这是更新的完整内容；

CREATE PROCEDURE matlab.squaring()
 BEGIN
   DECLARE finish BOOLEAN DEFAULT 0; # <- set up initial conditions
   DECLARE square BIGINT(10);
   DECLARE ID INT(10);
   DECLARE Numb INT (10);
   DECLARE id_cur CURSOR FOR
     SELECT ID, Numb FROM A WHERE EXISTS ( SELECT ID FROM c);
   DECLARE CONTINUE HANDLER FOR NOT FOUND SET @finish = TRUE;
   SET @square= @Numb * @Numb;

   INSERT INTO B
   (
     ID ,
     Numb ,
     square
   )     values ( @ID , @Numb, @square);

 OPEN id_cur;

 the_loop : LOOP
    FETCH id_cur INTO ID;

    IF finish THEN
       CLOSE id_cur;
       LEAVE the_loop;
    END IF;
END LOOP the_loop;
END//
于 2013-06-03T09:21:00.433 回答