SQL Server函数之《计算地球上两个坐标点距离》

SQL 自带数据类型 GEOGRAPHY ,函数 ： STDistance

--计算地球上两个坐标点（经度，纬度）之间距离sql函数
ALTER  FUNCTION [dbo].[fnGetDistance] 
 
(@LatBegin REAL, @LngBegin REAL,@LatEnd REAL,@LngEnd REAL) 
     Returns real
       AS
BEGIN

DECLARE @Distance REAL

Set @Distance=geography::Point(@LatBegin, @LngBegin, 4326).STDistance(geography::Point(@LatEnd,@LngEnd, 4326))

       RETURN @Distance
END

普通sql函数

--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