sqlserver 根据经纬度计算两点之间距离

做出行类项目，乘客端下单时当前经纬度和司机实时经纬度对比，如果距离小于5公里则司机可以收到订单通知

计算函数：
–计算地球上两个坐标点（经度，纬度）之间距离sql函数 –作者：lordbaby –整理：www.aspbc.com
CREATE FUNCTION [dbo].[fnGetDistance](@LatBegin REAL, @LngBegin REAL, @LatEnd REAL, @LngEnd REAL)
RETURNS FLOAT
AS
BEGIN
–距离(千米)
DECLARE @Distance REAL
DECLARE @EARTH_RADIUS REAL
SET @EARTH_RADIUS = 6378.137
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
–SET @Distance = Round(@Distance * 10000) / 10000
RETURN @Distance
END

使用方法如下：

SELECT * FROM 表名 WHERE dbo.fnGetDistance(108.89382764697076,34.16389439109832,longitude,latitude) < 5