Question

我正在尝试创建存储过程，使用本文将特定时区城市的日期时间转换为另一个：Effectively Converting dates between UTC and Local (ie. PST) time in SQL 2005

    ALTER PROCEDURE [dbo].[Get_TimeOfTimeZone]
    (
        @DateTimeFrom   datetime,
        @CityNameFrom   nvarchar(MAX),
        @CityNameTo     nvarchar(MAX),
        @ResultDate     datetime OUTPUT
    )

AS
    SET NOCOUNT ON

    SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED

    Declare @Query nvarchar(1000)
    Declare @ParmDefinition nvarchar (500)

    SET @Query = N''
    SET @Query = @Query + N'SELECT tz.Offset, tz.TimeZoneID '
    SET @Query = @Query + N'FROM TimeZoneCity, TimeZones tz WITH (NOLOCK) '
    --SET @Query = @Query + N'INNER JOIN    TimeZones WITH (NOLOCK) ON TimeZoneCity.TimeZoneID = tz.TimeZoneID '
    SET @Query = @Query + N'LEFT JOIN   TimeZoneDaylightSavings WITH (NOLOCK) ON TimeZoneDaylightSavings.TimeZoneID = tz.TimeZoneID '
    SET @Query = @Query + N'    WHERE TimeZoneCity.CityName = @CityNameTo '
    SET @Query = @Query + N'    AND TimeZoneCity.TimeZoneID = tz.TimeZoneID '
    SET @Query = @Query + N'        AND @DateTimeFrom >= TimeZoneDaylightSavings.BeginDst AND @DateTimeFrom < TimeZoneDaylightSavings.EndDst '

    SET @Query = @Query + N'SET @ResultDate =   DATEADD(HH, tz.Offset + CASE WHEN tz.TimeZoneID IS NOT NULL THEN 1 ELSE 0 END, '
    SET @Query = @Query + N'                            DATEADD(HH, (SELECT TimeZones.Offset '
    SET @Query = @Query + N'                                            FROM TimeZones, TimeZoneCity WITH (NOLOCK) ' 
    SET @Query = @Query + N'                                            WHERE TimeZoneCity.CityName = @CityNameFrom '
    SET @Query = @Query + N'                                            AND TimeZoneCity.TimeZoneID = TimeZones.TimeZoneID), '
    SET @Query = @Query + N'                                    @DateTimeFrom)) '

    SET @ParmDefinition = N'@ResultDate datetime, @DateTimeFrom datetime, @CityNameFrom nvarchar(MAX), @CityNameTo nvarchar(MAX) '

    EXECUTE sp_executesql @Query, @ParmDefinition, @ResultDate = @ResultDate, @DateTimeFrom = @DateTimeFrom, @CityNameFrom = @CityNameFrom, @CityNameTo = @CityNameTo

    SET NOCOUNT OFF 
RETURN

当我执行它时，我有这些错误：

Msg 4104, Level 16, State 1, Line 1
The multi-part identifier "tz.Offset" could not be bound.
Msg 4104, Level 16, State 1, Line 1
The multi-part identifier "tz.TimeZoneID" could not be bound.

有人可以查看我的存储过程并帮助我吗？非常感谢

Answer 1

您在查询中混合了JOIN个类型。使用逗号和WHERE子句

连接以下行

FROM TimeZoneCity, TimeZones tz WITH (NOLOCK)

由于您正在混合连接语法，因此别名tz不可用。你应该使用相同的语法。这一行应该是：

SET @Query = @Query + N'FROM TimeZoneCity 
                        INNER JOIN TimeZones tz WITH (NOLOCK) 
                              ON TimeZoneCity.TimeZoneID = tz.TimeZoneID'

检查存储过程：将特定时区城市的日期时间转换为另一个

1 个答案: