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SQL 语句: select location.* from (select *,round(6378.138*2*asin(sqrt(pow(sin( (36.668530*pi()/180-px_lat*pi()/180)/2),2)+cos(36.668530*pi()/180)*cos(px_lat*pi()/180)* pow(sin( (117.020359*pi()/180-px_lon*pi()/180)/2),2)))*1000) as distance from bsx_training where (px_state = 1) and (type_id != '') and (((px_lat >= 27.683290277922) and (px_lat 008b0d02af5e880524b45e5a244da4e2= 105.81826766053) and (px_lon 9334a76f72bb020976db88cc0e9d5ea0= {["minLat"]}) and (px_lat 71322fc885cb7c46ea769eb6fff02986= {['minLng']}) and (px_lon 4615b1a699ff3838c5fbc301a9257e34= {[0]}) and (location.distance 12b943c66ffff944f0d062a653df4b62") !== = (">", .= " and (location.distance >= {[1]})"
下面算出经纬度范围内的数据控制函数
/** * * @param $latitude 纬度 * @param $longitude 经度 * @param $raidus 半径范围(单位:米) * @return multitype:number */ function getAround($latitude,$longitude,$raidus) { $PI = 3.14159265; $degree = (24901*1609)/360.0; $dpmLat = 1/$degree; $radiusLat = $dpmLat*$raidus; $minLat = $latitude - $radiusLat; $maxLat = $latitude + $radiusLat; $mpdLng = $degree*cos($latitude * ($PI/180)); $dpmLng = 1 / $mpdLng; $radiusLng = $dpmLng*$raidus; $minLng = $longitude - $radiusLng; $maxLng = $longitude + $radiusLng; return array (minLat=>$minLat, maxLat=>$maxLat, minLng=>$minLng, maxLng=>$maxLng); }
要实现根据经纬度排序
就直接调用distance_sql(lon1,lat1,lon2,lat2)传入参数 并且as 一个别名例如 as distance, 然后sql语句中 order by 排序 根据 distance排序
如果筛选距离段 1000米-2000米的数据
那就sql语句嵌套sql
select *.loation from (select *,round(6378.138*2*asin(sqrt(pow(sin( (36.668530*pi()/180-px_lat*pi()/180)/2),2)+cos(36.668530*pi()/180)*cos(px_lat*pi()/180)* pow(sin( (117.020359*pi()/180-px_lon*pi()/180)/2),2)))*1000) as distance) from table location where (location.distance >= 1000) and (location.distance <= 2000))
如果实现根据最近位置排序sql
select *,round(6378.138*2*asin(sqrt(pow(sin( (36.668530*pi()/180-px_lat*pi()/180)/2),2)+cos(36.668530*pi()/180)*cos(px_lat*pi()/180)* pow(sin( (117.020359*pi()/180-px_lon*pi()/180)/2),2)))*1000) as distance order by distance
public function training_list() { $wheres1 = "(px_state = 1)"; $wheres2 = " where (1=1)"; $orderBy = " px_id desc"; if(I("post.location")){ // 用户经纬度 $location = explode(",",I("post.location")); $userLon = $location[0]; $userLat = $location[1]; // 经纬度筛选 $location = getAround($userLat,$userLon,1000000); $wheres1.=" and (((px_lat >= {$location["minLat"]}) and (px_lat e0e3adc5b1d21874bd68194c923dd33d= {$location['minLng']}) and (px_lon 26073fa122ec5ad079810924d812a7cf= {$km[0]}) and (location.distance 24d4f35e0098b2dac5d018927d5071cc") !== false){ $km = explode(">",$kmStr); $wheres2 .= " and (location.distance >= {$km[1]})"; } } } $showNum = 10; if(I("post.page")){ $page = I("post.page"); }else{ $page = 1; } $n = ($page-1)*$showNum; $field = "*{$distanceSql}"; $sql = "select location.* from (select {$field} from bsx_training where {$wheres1} order by {$orderBy} limit {$n},{$showNum}) location {$wheres2}"; $training = M()->query($sql); dump(M()->getlastsql());die; }
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