将浮点经度和纬度转换为地理

Question

如何将浮点纬度和经度值转换为地理类型值？我有@lat和@lon变量。

Answer 1

随着case语句：

CASE 
    WHEN ((@Latitude IS NOT NULL) AND (@Longitude IS NOT NULL)) 
    THEN geography::Point(@Latitude, @Longitude, 4326) 
    ELSE NULL   
END 

或者如果变体：

DECLARE @Location geography = NULL 
IF (@Latitude IS NOT NULL AND @Longitude IS NOT NULL) 
    SET @Location = geography::Point(@Latitude, @Longitude, 4326); 

Answer 2

我已经找到解决办法由自己：

geography::STPointFromText(
    'POINT(' + CAST(@lon AS VARCHAR(20)) + ' ' + CAST(@lat AS VARCHAR(20)) + ')', 4326)