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当我运行此代码时，mysql会向我显示一个不允许的语法错误

DELIMITER //
    CREATE PROCEDURE `GetHotelByLocationArrivalDeparture`(IN strLocation VARCHAR(500),IN dateArrival DATE,IN dateDeparture DATE,IN strOrderBy VARCHAR(500),IN nMinPrice FLOAT,IN nMaxPrice FLOAT)
BEGIN 

SELECT
        HT.HotelId AS HotelId,
        HT.HotelName AS HotelName,
        HT.HotelDescription AS HotelDescription,
        HT.HotelLogo AS HotelLogo,
        HT.HotelStar AS HotelStar,
        HT.HotelLocation AS HotelLocation,
        HT.HotelLatitude AS HotelLatitude,  
        HT.HotelLongitude AS HotelLongitude,
        HT.AccomodationTypeId AS AccomodationTypeId,
        RM.RoomId AS RoomId,
        RM.RoomName AS RoomName,
        RM.RoomMaxPeople AS RoomMaxPeople,
        RM.RoomCurrency AS RoomCurrency,
        RM.RoomMinDays AS RoomMinDays,
        RM.RoomKeyInfo AS RoomKeyInfo,
        RM.RoomBedTypeOneId AS RoomBedTypeOneId,
        RM.RoomBedTypeTwoId AS RoomBedTypeTwoId,
        DR.DateRangeId AS DateRangeId,
        DR.DateRangeFromDate AS DateRangeFromDate,
        DR.DateRangeToDate AS DateRangeToDate,
        DR.DateRangeNote AS DateRangeNote,
        DR.CurrencyId AS DateRangeCurrencyId,
        DR.DateRangeMinNight AS DateRangeMinNight,
        DR.RoomId AS DateRangeRoomId,
        DRR.DateRowId AS DateRowId,
        DRR.DateRowNetRate AS DateRowNetRate,
        DRR.DateRowDiscount AS DateRowDiscount,
        DRR.DateRowDiscountedNet AS DateRowDiscountedNet,
        DRR.DateRowTax AS DateRowTax,
        DRR.DateRowHotelPrice AS DateRowHotelPrice,
        DRR.DateRowMarkup AS DateRowMarkup,
        DRR.DateRowClientPrice AS DateRowClientPrice,
        DRR.DateRowConvertedPrice AS DateRowConvertedPrice,
        DRR.DateRowType AS DateRowType
    FROM 
        tblhotel HT,
        tblroom RM,
        tbldaterange DR,
        tbldaterow DRR
WHERE 
        (
                LOWER(HT.HotelName) REGEXP TRIM(BOTH '"' FROM strLocation) 
             OR LOWER(HT.HotelLocation) REGEXP TRIM(BOTH '"' FROM strLocation)
        )  
    AND 
        (
            (
                    DR.DateRangeToDate > TRIM(BOTH '"' FROM dateArrival) 
                AND TRIM(BOTH '"' FROM dateDeparture) >  DR.DateRangeFromDate 
                AND TRIM(BOTH '"' FROM dateArrival)   >= DR.DateRangeFromDate
                AND TRIM(BOTH '"' FROM dateDeparture) <= DR.DateRangeToDate
            )
            OR
            (
                ( 
                    TRIM(BOTH '"' FROM dateDeparture) BETWEEN DR.DateRangeFromDate AND DR.DateRangeToDate
                ) 
                AND TRIM(BOTH '"' FROM dateDeparture) >  DR.DateRangeFromDate 
                AND TRIM(BOTH '"' FROM dateArrival)   >= DR.DateRangeFromDate
                AND TRIM(BOTH '"' FROM dateDeparture) <= DR.DateRangeToDate
            )
        )
    AND (HT.HotelId     = RM.HotelId)
    AND (RM.RoomId      = DR.RoomId)
    AND (DR.DateRangeId = DRR.DateRangeId)    
    AND 
        (       HT.IsActive = 1 
            AND HT.IsDeleted <> 1 
            AND RM.IsActive = 1 
            AND RM.IsDeleted <> 1 
            AND DR.IsActive = 1 
            AND DR.IsDeleted <> 1
        )
        /* This is what i want to do */
        IF (nMinPrice > AND nMaxPrice > 0) THEN
            AND DRR.DateRowClientPrice BETWEEN nMinPrice AND nMaxPrice
        END IF;    
        /* This is what i want to do */
        ORDER BY 
                CASE WHEN strOrderBy='sorthotelname_DESC' THEN HT.HotelName END DESC,  
                CASE WHEN strOrderBy='sorthotelname_ASC' THEN HT.HotelName END ASC,
                CASE WHEN strOrderBy='sorthotelstars_DESC' THEN HT.HotelStar END DESC,  
                CASE WHEN strOrderBy='sorthotelstars_ASC' THEN HT.HotelStar END ASC,
                CASE WHEN strOrderBy='sorthotelprice_DESC' THEN CONCAT(DRR.DateRowClientPrice ,'') END DESC,  
                CASE WHEN strOrderBy='sorthotelprice_ASC' THEN CONCAT(DRR.DateRowClientPrice ,'') END ASC,
                CASE WHEN strOrderBy='sorthotellocation_DESC' THEN HT.HotelLocation END DESC,  
                CASE WHEN strOrderBy='sorthotellocation_ASC' THEN HT.HotelLocation END ASC;
END //
DELIMITER ;
4

1 回答 1

1

我不认为你可以IF在这样的 WHERE 子句中间扔一个。相反，重新设计逻辑，使你的IF成为一个布尔表达式，可能是这样的：

and case
    when nMinPrice > 0 and nMaxPrice > 0 then
        DRR.DateRowClientPrice BETWEEN nMinPrice AND nMaxPrice
    else
        1
    end

如果您的nMinPrice和nMaxPrice是肯定的，则该 CASE 将具有以下价值：

DRR.DateRowClientPrice BETWEEN nMinPrice AND nMaxPrice

如果其中一个nMinPriceornMaxPrice不是正数，那么 CASE 将是1（即真）并且与 TRUE 的逻辑合取是无操作的，因此 CASE 将被有效地忽略。

于 2013-08-03T05:29:32.493 回答