MySql Cursor - 创建过程 [英] MySql Cursor - Creating a procedure

问题描述

我第一次尝试创建光标。我看了文档，我理解的概念，但我似乎不能得到它甚至被宣布...

我使用：

• MySql 5.1.41


• SqlYog作为经理


• （在xampp安装程序上本地运行）

即使复制粘贴 http://dev.mysql.com/doc/refman/5.1/en/cursors.html

  CREATE PROCEDURE curdemo（）
 BEGIN 
 DECLARE done INT DEFAULT 0; 
 DECLARE a CHAR（16）; 
 DECLARE b，c INT; 
 DECLARE cur1 CURSOR FOR SELECT id，data FROM test.t1; 
 DECLARE cur2 CURSOR FOR SELECT i FROM test.t2; 
 DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1; 
 
 OPEN cur1; 
 OPEN cur2; 
 
 read_loop：LOOP 
 FETCH cur1 INTO a，b; 
 FETCH cur2 INTO c; 
 IF done THEN 
 LEAVE read_loop; 
 END IF; 
如果b < c THEN 
 INSERT INTO test.t3 VALUES（a，b）; 
 ELSE 
 INSERT INTO test.t3 VALUES（a，c）; 
 END IF; 
 END LOOP; 
 
 CLOSE cur1; 
 CLOSE cur2; 
 END; 
  

我立即收到错误：
错误代码：1064

您的SQL语法有错误;
检查对应于
的手册您的MySQL服务器版本
右键语法在第3行附近使用

和其他一些人，

这对我没有任何意义，任何种类的灵魂可以帮助我吗？

谢谢

因此我得到了示例查询工作（感谢ajreal），重置了DELIMITER。但是当我运行我的查询：

  DELIMITER ## 
 CREATE PROCEDURE RetiraPoints（）
 BEGIN 
 DECLARE userid BIGINT; 
 DECLARE done INT DEFAULT 0; 
 DECLARE cur CURSOR FOR SELECT uid FROM viewpoints; 
 DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1; 
 OPEN cur; 
 read_loop：LOOP 
 FETCH cur INTO userid; 
 IF done THEN 
 LEAVE read_loop; 
 END IF; 
 INSERT INTO points（iduser，points，pointcat）VALUES（uid，-1,1），（userid，-1,2），（userid，-1,3），（userid，-1,4） ，（userid，-1,5），（userid，-1,6）; 
 END LOOP; 
 CLOSE cur; 
 END; ## 
  

我得到：
错误代码：1064

您的SQL语法有错误;
检查对应于
的手册您的MySQL服务器版本的
右键语法使用接近'DECLARE done
INT DEFAULT 0; DECLARE cur CURSOR FOR
SELECT uid FROM viewpoints; 'at line
1

我的上帝，这很难...

NOT;

pre> delimiter ##
...
end ##


需要在分隔符后面加一个空格

结尾 END 不需要;

i'm trying to create a cursor for the first time. I have looked at the documentation, i understand the concept, but i can't seem to get it to even be declared...

I'm using:

• MySql 5.1.41
• SqlYog as a manager
• (running locally on a xampp instalation)

Even when copy pasting the example found in http://dev.mysql.com/doc/refman/5.1/en/cursors.html

    CREATE PROCEDURE curdemo()
BEGIN
  DECLARE done INT DEFAULT 0;
  DECLARE a CHAR(16);
  DECLARE b,c INT;
  DECLARE cur1 CURSOR FOR SELECT id,data FROM test.t1;
  DECLARE cur2 CURSOR FOR SELECT i FROM test.t2;
  DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1;

  OPEN cur1;
  OPEN cur2;

  read_loop: LOOP
    FETCH cur1 INTO a, b;
    FETCH cur2 INTO c;
    IF done THEN
      LEAVE read_loop;
    END IF;
    IF b < c THEN
      INSERT INTO test.t3 VALUES (a,b);
    ELSE
      INSERT INTO test.t3 VALUES (a,c);
    END IF;
  END LOOP;

  CLOSE cur1;
  CLOSE cur2;
END;

I get errors right away: Error Code : 1064

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 3

and a bunch of others following,

this doesn't make any sense to me, can any kind soul help me please?

Thank you

So i got the sample query to work (thanks to ajreal), with resetting the DELIMITER. But when i run my query:

DELIMITER##
CREATE PROCEDURE RetiraPoints()
BEGIN
    DECLARE userid BIGINT;  
    DECLARE done INT DEFAULT 0;
    DECLARE cur CURSOR FOR SELECT uid FROM viewpoints;
    DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1;
    OPEN cur;
    read_loop: LOOP 
    FETCH cur INTO userid;
        IF done THEN
            LEAVE read_loop;
        END IF;
        INSERT INTO points (iduser, points, pointcat) VALUES (uid, -1, 1), (userid, -1, 2), (userid, -1, 3), (userid, -1, 4), (userid, -1, 5), (userid, -1, 6);
    END LOOP;
    CLOSE cur;
END;##

i get: Error Code : 1064

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'DECLARE done INT DEFAULT 0; DECLARE cur CURSOR FOR SELECT uid FROM viewpoints; ' at line 1

my god, this is hard...

解决方案

You forget to reset the delimiter to NOT ;

delimiter ##
...
end##

need to put a space right after delimiter

And the ending END does not require ;

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