经纬度计算距离在HQL中应用实例

根据给定地点的经纬度（longitude,latitude）,查询给定范围（distance）内的对象列表，由近及远。

java计算公式：

def lat1 = 32.361403

def lat2 = 40.245992

def lng1 = 118.78418

def lng2 = 116.477051

double EARTH_RADIUS = 6378.137; //地球半径

double radLat1 = lat1* Math.PI / 180.0

double radLat2 = lat2* Math.PI / 180.0

double a = radLat1 - radLat2;

double b = lng1* Math.PI / 180.0 - lng2* Math.PI / 180.0

double s = 2 * Math.asin(Math.sqrt(Math.pow(Math.sin(a/2),2) +

Math.cos(radLat1)*Math.cos(radLat2)*Math.pow(Math.sin(b/2),2)));

s = s * EARTH_RADIUS;

s = Math.round(s * 10000) / 10000;

return s



实例：

List<Place> getClosestPlacesByLatitudeAndLongitude(Double distance, String pageId, Double latitude, Double longitude, int offset, int length) {

def placeList = []

if (pageId) {

def page = accountService.getContentProviderForPage(pageId)

if (!page?.rewardsEnabled) {

return new ArrayList()

}

placeList = Place.executeQuery("from Place as p where p.contentProvider =:page and (asin(sqrt(pow(sin((p.latitude - :latitude) * 3.1415926 / 360), 2) + cos(p.latitude * 3.1415926 / 180) * cos(:latitude * 3.1415926 / 180) * pow(sin((p.longitude - :longitude)
* 3.1415926 / 360), 2)))*12756274) < :distance Order by (asin(sqrt(pow(sin((p.latitude - :latitude) * 3.1415926 / 360), 2) + cos(p.latitude * 3.1415926 / 180) * cos(:latitude * 3.1415926 / 180) * pow(sin((p.longitude - :longitude) * 3.1415926 / 360), 2)))*12756274)
asc name asc", [distance:distance, page: page, latitude: latitude, longitude: longitude, max: length, offset: offset])

} else {

placeList = Place.executeQuery("from Place as p where (asin(sqrt(pow(sin((p.latitude - :latitude) * 3.1415926 / 360), 2) + cos(p.latitude * 3.1415926 / 180) * cos(:latitude * 3.1415926 / 180) * pow(sin((p.longitude - :longitude) * 3.1415926 / 360), 2)))*12756274)
< :distance Order by (asin(sqrt(pow(sin((p.latitude - :latitude) * 3.1415926 / 360), 2) + cos(p.latitude * 3.1415926 / 180) * cos(:latitude * 3.1415926 / 180) * pow(sin((p.longitude - :longitude) * 3.1415926 / 360), 2)))*12756274) asc name asc", [distance:distance,
latitude: latitude, longitude: longitude, max: length, offset: offset])

}

return placeList

}