Question

我试图找到我存储的$ eastings $ northings坐标与我存储在mysql中的表中的Eastings / Northings坐标之间的距离。我正在使用Laravel。由于某种原因，查询无效。这是代码：

public function postAnalysis(){

$relevant_home = Input::get('relevant_homes');

$asset = Home::where('Home_name', '=' , $relevant_home)->first();

$Eastings   = $asset->Eastings;
$Northings  = $asset->Northings;

/*
$competitors = Home::raw('SELECT SQRT(POW($Eastings - `Eastings`,2) + POW($Northings - `Northings`,2)) as distance FROM homes HAVING distance <=10 ORDER BY distance ASC')->get();
echo $competitors;
*/



$competitors = DB::table('homes')
                -> select(DB::raw('SQRT(POW('.$Eastings.' - Eastings,2) + POW('.$Northings.' - Northings,2)) AS distance'))
                -> where('distance', '<', 10)
                -> get();

echo $competitors;


}

显示的错误是：

SQLSTATE[42S22]: Column not found: 1054 Unknown column 'distance' in 'where clause' (SQL: select SQRT(POW(390120 - Eastings,2) + POW(298935 - Northings,2)) AS distance from `homes` where `distance` < 10)

Answer 1

如果您根据计算字段（通过选择列表中的DB :: raw（）生成）进行选择，而不是根据存储在数据库中的实际表列进行选择，那么您需要使用{{ 1}}子句而不是having()子句。

这不是特别是Laravel / Eloquent或ORM问题，而是SQL的一般要求。

mysql距离查询不能在laravel下工作

1 个答案: