数据库：计算地球上两个坐标点之间里程

–-计算地球上两个坐标点（经度，纬度）之间距离sql函数 
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
RETURN @Distance
END
--使用方法如下：
SELECT dbo.fnGetDistance(25,30,12.56,15.5) ;

–-计算地球上两个坐标点（经度，纬度）之间距离sql函数 
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
RETURN @Distance
END
--使用方法如下：
SELECT dbo.fnGetDistance(25,30,12.56,15.5) ;

CREATE OR REPLACE FUNCTION GetDistance
(lat1 number, lng1 number,lat2 number,lng2 number) 
RETURN NUMBER is 
  earth_padius number := 6378.137; 
  radLat1      number := Radian(lat1); 
  radLat2      number := Radian(lat2); 
  a            number := radLat1 - radLat2; 
  b            number := Radian(lng1) - Radian(lng2); 
  s            number := 0; 
begin 
  s := 2 * 
       Asin(Sqrt(power(sin(a / 2), 2) + 
                 cos(radLat1) * cos(radLat2) 
                 * power(sin(b / 2), 2))); 
  s := s * earth_padius; 
  s := Round(s * 10000) / 10000; 
  return s; 
end; 
--使用方法
select GetDistance(25,30,12.56,15.5) from dual