Question

我有一个存储过程，它检查一个表中的行以将其详细信息插入另一个表中。我正在使用游标但是我遇到了一个大问题：游标在同一行上循环2次。所以我得到了2次重复插入。这是sp代码：

    IF (SELECT 1 FROM NOVEDADES  WHERE LEGAJO_ID = pLEGAJO_ID AND FECHA >= pFECHA AND CONCEPTO_ID != 11 AND CONCEPTO_ID != 13 AND CONCEPTO_ID != 12 LIMIT 1) = 1
    THEN
        BEGIN
        DECLARE vCONCEPTO_ID INT;
        DECLARE vMONTO DECIMAL(12,2);
        DECLARE vID INT;
        DECLARE vDONE INT DEFAULT 0;

        DECLARE CURSOR_NOVEDADES CURSOR FOR     

        SELECT ID
        FROM NOVEDADES 
        WHERE LEGAJO_ID = pLEGAJO_ID
        AND FECHA >= pFECHA
        AND CONCEPTO_ID != 11 
        AND CONCEPTO_ID != 13 
        AND CONCEPTO_ID != 12;

        DECLARE CONTINUE HANDLER FOR NOT FOUND SET vDONE=1;

        OPEN CURSOR_NOVEDADES;

        SET vDONE = 0;

        REPEAT

            FETCH CURSOR_NOVEDADES INTO vID;

            SELECT CONCEPTO_ID, MONTO INTO vCONCEPTO_ID, vMONTO
            FROM NOVEDADES WHERE ID = vID;

            INSERT INTO LIQUIDACIONES_DETALLE (LIQUIDACION_ID, CONCEPTO_ID, MONTO)
            VALUES(pLIQUIDACION_ID, vCONCEPTO_ID, vMONTO);

        UNTIL vDONE END REPEAT;
        CLOSE CURSOR_NOVEDADES;
        END;
    END IF;

以“p”开头的变量是IN参数，“v”是常见变量。我必须说光标的查询只返回1个值。我也尝试过LOOP，但结果相同。我已经尝试“调试”插入一些SELECTS的程序，我看到重复。

非常感谢。

Answer 1

在循环的最后一次迭代中，fetch失败。执行此操作时，您将重新插入以前的值。以下是解决此问题的一种方法：

    REPEAT

        FETCH CURSOR_NOVEDADES INTO vID;

        if ! vdone then

            SELECT CONCEPTO_ID, MONTO INTO vCONCEPTO_ID, vMONTO
            FROM NOVEDADES WHERE ID = vID;

            INSERT INTO LIQUIDACIONES_DETALLE (LIQUIDACION_ID, CONCEPTO_ID, MONTO)
            VALUES(pLIQUIDACION_ID, vCONCEPTO_ID, vMONTO);
       end

    UNTIL vDONE END REPEAT;

MySQL游标两次获取相同的结果

1 个答案: