SQL函数

GO
–计算地球上两个坐标点（经度，纬度）之间距离sql函数
CREATE FUNCTION [dbo].[GetDistance](@LatBegin REAL, @LngBegin REAL, @LatEnd REAL, @LngEnd REAL) RETURNS FLOAT
AS
BEGIN
–距离(米)
DECLARE @Distance REAL
DECLARE @EARTH_RADIUS REAL
SET @EARTH_RADIUS = 6371393
DECLARE @RadLatBegin REAL,@RadLatEnd REAL,@RadLatDiff REAL,@RadLngDiff REAL
SET @RadLatBegin = @LatBegin *PI()/180.0
SET @RadLatEnd = @LatEnd *PI()/180.0
SET @RadLatDiff = @RadLatBegin – @RadLatEnd
SET @RadLngDiff = @LngBegin *PI()/180.0 – @LngEnd *PI()/180.0
SET @Distance = 2 *ASIN(SQRT(POWER(SIN(@RadLatDiff/2), 2)+COS(@RadLatBegin)*COS(@RadLatEnd)*POWER(SIN(@RadLngDiff/2), 2)))
SET @Distance = @Distance * @EARTH_RADIUS
RETURN @Distance
END

 
SQL 自带数据类型 GEOGRAPHY ,函数 ： STDistance

GO
–计算地球上两个坐标点（经度，纬度）之间距离sql函数
CREATE FUNCTION [dbo].[GetDistanceByNative](@LatBegin REAL, @LngBegin REAL, @LatEnd REAL, @LngEnd REAL) RETURNS FLOAT
AS
BEGIN
–距离(米)
DECLARE @Distance REAL
Set @Distance=geography::Point(@LatBegin, @LngBegin, 4326).STDistance(geography::Point(@LatEnd,@LngEnd, 4326))
RETURN @Distance
END