复制代码 代码如下:
go
--创建经纬度距离计算函数
CREATEFUNCTION [dbo].[fnGetDistance]
--LatBegin 开始经度
--LngBegin 开始维度
(@LatBegin REAL, @LngBegin REAL, @LatEnd REAL, @LngEnd REAL)
RETURNSFLOAT
AS
BEGIN
--距离(千米)
DECLARE @Distance REAL
DECLARE @EARTH_RADIUS REAL
SET @EARTH_RADIUS = 6378.137
DECLARE @RadLatBegin REAL,
@Ra python dLatEnd REAL,
@RadLatDiff REAL,
@RadLngDiff REAL
SET @RadLatBegin = @LatBegin *PI()/ 180.0
SET @RadLatEnd = @LatEnd *PI()/ 180.0
SET @RadLat www.cppcns.com Diff = @RadLatBegin - @RadLat python End
SET @RadLngDiff = @LngBegin *PI()/ 180.0 - @LngEnd *PI()/ 180.0
SET @Distance = 2 *ASIN(
SQRT(
POWER(SIN(@RadLatDiff / 2), 2) javascript +COS(@RadLatBegin)*COS(@RadLatEnd)
*POWER(SIN(@RadLngDiff / 2), 2)
)
)
SET @Distance = @Distance www.cppcns.com * @EARTH_RADIUS
--SET @Distance = Round(@Distance * 10000) / 10000
RETURN @Distance
END
@Distance的单位为:千米
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