sql-server-2008 – 在sqlserver 2008中使用Geography数据类型的

发布时间：2020-12-12 06:59:15 所属栏目：MsSql教程来源：网络整理

导读：这是我的代码. Create Table [dbo].[MajorCities]([CityID] int Identity(1,1),[CityName] varchar(60),[Latitude] float,[Longitude] float,GeoRef Geography)INSERT INTO dbo.[MajorCities] values ('New Delhi,India',28.6,77.2,null),('Paris,France',48.

这是我的代码.

Create Table [dbo].[MajorCities]
(
[CityID] int Identity(1,1),[CityName] varchar(60),[Latitude] float,[Longitude] float,GeoRef Geography
)

INSERT INTO dbo.[MajorCities] values
 ('New Delhi,India',28.6,77.2,null),('Paris,France',48.86667,2.3333,('Rio de Janeiro,Brazil',-22.9,-43.23333,('Sydney,Australia',-33.88306,151.21667,('New York City,USA',40.78333,-73.96667,null)

select * from [MajorCities]


UPDATE [dbo].[MajorCities]
SET [GeoRef] = geography::STPointFromText ('POINT (' + CAST ([Longitude] AS VARCHAR (20)) + ' ' +
                    CAST ([Latitude] AS VARCHAR (20)) + ')',4326)

我想找到KM中两个位置之间的距离.

请帮我.
谢谢.

解决方法

如果你有纬度和经度的度数(就像你的表中一样),那么你可以使用以下功能：

CREATE FUNCTION dbo.DictanceKM(@lat1 FLOAT,@lat2 FLOAT,@lon1 FLOAT,@lon2 FLOAT)
RETURNS FLOAT 
AS
BEGIN

    RETURN ACOS(SIN(PI()*@lat1/180.0)*SIN(PI()*@lat2/180.0)+COS(PI()*@lat1/180.0)*COS(PI()*@lat2/180.0)*COS(PI()*@lon2/180.0-PI()*@lon1/180.0))*6371
END

或者,如果您坚持使用地理类型,则使用方法是：

DECLARE @g geography;
DECLARE @h geography;
SET @g = geography::STGeomFromText('LINESTRING(-122.360 47.656,-122.343 47.656)',4326);
SET @h = geography::STGeomFromText('POINT(-122.34900 47.65100)',4326);
SELECT @g.STDistance(@h);

（编辑：李大同）

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