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我希望做一些在MySQL中看起来有点复杂的东西.实际上,我希望打开一个游标,做一个循环,然后在这个循环中,使用前一个fetch中的数据打开第二个游标,然后重新循环结果.

  DECLARE idind INT;
  DECLARE idcrit INT;
  DECLARE idindid INT;
  DECLARE done INT DEFAULT 0;
  DECLARE done2 INT DEFAULT 0;
  DECLARE curIndicateur CURSOR FOR SELECT id_indicateur FROM indicateur;
  DECLARE curCritereIndicateur CURSOR FOR SELECT C.id_critere FROM critere C where C.id_indicateur=idind;
  DECLARE CONTINUE HANDLER FOR SQLSTATE '02000' SET done = 1;

  set idindid=54;
  OPEN curIndicateur;
  REPEAT
    FETCH curIndicateur INTO idind;
    open curCritereIndicateur;
    REPEAT
      FETCH curIndicateur INTO idcrit;
      INSERT INTO SLA_DEMANDE_STATUS (iddemande,idindicateur,indicateur_status,progression) values('0009',idcrit,'OK',10.0);
    UNTIL done END REPEAT;
    close curCritereIndicateur;
  UNTIL done END REPEAT; …

为了使用MySQL动态使用游标,是否可以在存储过程的循环中声明游标？我试过并得到一个错误:

increment: LOOP
DECLARE cur1 CURSOR FOR SELECT person_id, publication_id  FROM p_publication WHERE person_id = new_count;
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1;
OPEN cur1;
REPEAT
    FETCH cur1 INTO pub_id, per_id;
IF NOT done THEN
          INSERT INTO test.t2 VALUES (pub_id, per_id);
    END IF;
SET new_count = new_count + 1;
  UNTIL done END REPEAT;

     CLOSE cur1;
IF !(new_count < old_count ) THEN LEAVE increment;
END IF;
END LOOP increment;

您的SQL语法有错误; 查看与您的MySQL服务器版本对应的手册,以便在第12行'DECLARE cur1 CURSOR FOR SELECT person_id,publication_id FROM person_has_public'附近使用正确的语法 …