数据库实用脚本方法教程

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1、SQLServer脚本

–-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) ;

2、MySQl脚本

–-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) ;

3、Orcale脚本

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

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