当谈到 MS SQL 时,我是一个完整的新手,并且在搜索时在线找到了此代码。它似乎完全符合我的要求,即根据纬度和纬度值进行半径搜索。
但是,我不断收到:关键字“CREATE”附近的语法不正确。,这是代码的第一行。我的数据库是 2008 MS SQL
这是代码:
CREATE FUNCTION CalculateDistance
(@Longitude1 Decimal(8,5),
@Latitude1 Decimal(8,5),
@Longitude2 Decimal(8,5),
@Latitude2 Decimal(8,5))
Returns Float
AS BEGIN
Declare @Temp Float
Set @Temp = sin(@Latitude1/57.2957795130823) * sin(@Latitude2/57.2957795130823) + cos(@Latitude1/57.2957795130823) * cos(@Latitude2/57.2957795130823) * cos(@Longitude2/57.2957795130823 - @Longitude1/57.2957795130823)
if @Temp > 1
Set @Temp = 1
Else If @Temp < -1
Set @Temp = -1
Return (3958.75586574 * acos(@Temp) )
End
-- FUNCTION
CREATE FUNCTION LatitudePlusDistance(@StartLatitude Float, @Distance Float) Returns Float
AS BEGIN
Return (Select @StartLatitude + Sqrt(@Distance * @Distance / 4766.8999155991))
End
-- FUNCTION
CREATE FUNCTION LongitudePlusDistance
(@StartLongitude Float,
@StartLatitude Float,
@Distance Float)
Returns Float
AS BEGIN
Return (Select @StartLongitude + Sqrt(@Distance * @Distance / (4784.39411916406 * Cos(2 * @StartLatitude / 114.591559026165) * Cos(2 * @StartLatitude / 114.591559026165))))
End
-- ACTUAL QUERY
-- Declare some variables that we will need.
Declare @Longitude Decimal(8,5),
@Latitude Decimal(8,5),
@MinLongitude Decimal(8,5),
@MaxLongitude Decimal(8,5),
@MinLatitude Decimal(8,5),
@MaxLatitude Decimal(8,5)
-- Get the lat/long for the given id
Select @Longitude = Longitude,
@Latitude = Latitude
From qccities
Where id = '21'
-- Calculate the Max Lat/Long
Select @MaxLongitude = LongitudePlusDistance(@Longitude, @Latitude, 20),
@MaxLatitude = LatitudePlusDistance(@Latitude, 20)
-- Calculate the min lat/long
Select @MinLatitude = 2 * @Latitude - @MaxLatitude,
@MinLongitude = 2 * @Longitude - @MaxLongitude
-- The query to return all ids within a certain distance
Select id
From qccities
Where Longitude Between @MinLongitude And @MaxLongitude
And Latitude Between @MinLatitude And @MaxLatitude
And CalculateDistance(@Longitude, @Latitude, Longitude, Latitude) <= 2
知道发生了什么吗?
谢谢!!!
编辑:非常感谢 bluefeet 和 Aaron Bertrand 为我指明了正确的方向!