将浮动纬度和经度转换为地理位置

Question

如何将浮动纬度和经度值转换为地理类型值？我有@lat和@lon变量.

Answer 1

用案例陈述:

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

或者使用if的变体:

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