我的MySQL脚本语法错误

Question

我正在尝试创建一个存储的函数，但是出现了一个错误，这使我发疯，我真的不知道脚本有什么问题，我认为其中没有错误，但是我不知道为什么正在收到此错误：

1064-您的SQL语法有误； 检查与您的MySQL服务器版本相对应的手册，以在'DECLARE cr1 CURSOR FOR SELECT codeArt，qte FROMLigneBonEntréeWHERE numBon ='附近使用正确的语法。

这是我的脚本：

DELIMITER $$

CREATE DEFINER=root@localhost FUNCTION verifierQteDemandee(numBonIn INT) RETURNS BOOLEAN
BEGIN
    DECLARE numLignesBonEntrée, numLignesBonSortie INTEGER;
    DECLARE codeArtLigneBonEntrée, codeArtLigneBonSortie, qteLigneBonEntrée, qteLigneBonSortie INTEGER;
    DECLARE no_more_rows BOOLEAN;
    DECLARE qteArticle INTEGER;
    DECLARE test BOOLEAN DEFAULT TRUE;

    SET numLignesBonEntrée =    (SELECT COUNT(*) FROM LigneBonEntrée WHERE numBon = numBonIn);

    SET numLignesBonSortie =    (SELECT COUNT(*) FROM numLignesBonSortie WHERE numBon = (SELECT estLieA FROM LigneBonEntrée WHERE numBon = numBonIn));

    IF numLignesBonEntrée <> numLignesBonSortie THEN
        SET test = FALSE;
    ELSE
        DECLARE cr1 CURSOR FOR  SELECT codeArt, qte FROM LigneBonEntrée WHERE numBon = numBonIn ORDER BY codeArt ASC;

        DECLARE cr2 CURSOR FOR  SELECT codeArt, qte FROM LigneBonSortieWHERE numBon = (SELECT estLieA FROM LigneBonEntréeWHERE numBon = numBonIn) ORDER BY codeArt ASC;

        DECLARE CONTINUE HANDLER FOR NOT FOUND
        SET no_more_rows = TRUE;

        OPEN cr1;
        OPEN cr2;

        the_loop: LOOP
            FETCH cr1 INTO codeArtLigneBonEntrée, qteLigneBonEntrée;
            FETCH cr2 INTO codeArtLigneBonSortie, qteLigneBonSortie;
            IF no_more_rows THEN 
                CLOSE cr;
                LEAVE the_loop;
            END IF;

            IF codeArtLigneBonEntrée <> codeArtLigneBonSortie THEN
                SET test = FALSE;
            END IF;

            IF qteLigneBonEntrée <> qteLigneBonSortie THEN
                SET test = FALSE;
            END IF;

        END LOOP the_loop;
    END IF;
    RETURN test;

END$$

DELIMITER ;

Answer 1

您的所有DECLARE必须位于该过程的顶部，然后再执行其他任何逻辑。 请尝试以下方法。

DELIMITER $$

CREATE DEFINER=root@localhost FUNCTION verifierQteDemandee(numBonIn INT) RETURNS BOOLEAN
BEGIN
    DECLARE numLignesBonEntrée, numLignesBonSortie INTEGER;
    DECLARE codeArtLigneBonEntrée, codeArtLigneBonSortie, qteLigneBonEntrée, qteLigneBonSortie INTEGER;
    DECLARE no_more_rows BOOLEAN;
    DECLARE qteArticle INTEGER;
    DECLARE test BOOLEAN DEFAULT TRUE;

    -- Moved declarations to before other logic
    DECLARE cr1 CURSOR FOR  SELECT codeArt, qte FROM LigneBonEntrée WHERE numBon = numBonIn ORDER BY codeArt ASC;
    DECLARE cr2 CURSOR FOR  SELECT codeArt, qte FROM LigneBonSortieWHERE numBon = (SELECT estLieA FROM LigneBonEntréeWHERE numBon = numBonIn) ORDER BY codeArt ASC;
    DECLARE CONTINUE HANDLER FOR NOT FOUND
        SET no_more_rows = TRUE;

    SET numLignesBonEntrée =    (SELECT COUNT(*) FROM LigneBonEntrée WHERE numBon = numBonIn);

    SET numLignesBonSortie =    (SELECT COUNT(*) FROM numLignesBonSortie WHERE numBon = (SELECT estLieA FROM LigneBonEntrée WHERE numBon = numBonIn));

    IF numLignesBonEntrée <> numLignesBonSortie THEN
        SET test = FALSE;
    ELSE

        OPEN cr1;
        OPEN cr2;

        the_loop: LOOP
            FETCH cr1 INTO codeArtLigneBonEntrée, qteLigneBonEntrée;
            FETCH cr2 INTO codeArtLigneBonSortie, qteLigneBonSortie;
            IF no_more_rows THEN 
                CLOSE cr;
                LEAVE the_loop;
            END IF;

            IF codeArtLigneBonEntrée <> codeArtLigneBonSortie THEN
                SET test = FALSE;
            END IF;

            IF qteLigneBonEntrée <> qteLigneBonSortie THEN
                SET test = FALSE;
            END IF;

        END LOOP the_loop;
    END IF;
    RETURN test;

END$$

DELIMITER ;

Mysql文档： http : //dev.mysql.com/doc/refman/5.0/en/declare.html

仅在BEGIN ... END复合语句中允许使用DECLARE，并且必须在其开始处以及其他任何语句之前。

声明必须遵循一定顺序。 游标声明必须出现在处理程序声明之前。 变量和条件声明必须出现在游标或处理程序声明之前。