如何根据房间持久性中的最近距离检索数据

Question

干草所有..我的android数据库中有一个客户table..我目前正在使用房间持久性，我希望获取我所有的客户数据..但是从一开始就顺序目前离我最近的位置..如何查询我的案例..我当前的纬度是 -7.3530829，我的经度目前是 112.6901788

    data in my customers table
    customers.address = "Waterpark Boulevard Citraland Area
    customers.handphone1 = "0857887328"
    customers.latitude = -7.2864881
    customers.longitude = 112.6525076


    data in my customers table
    customers.address = "Nature Conservation Area
    customers.handphone1 = "0857887328"
    customers.latitude = -7.3571553
    customers.longitude = 112.6862058


    data in my customers table
    customers.address = "Kawasan Taman Pinang
    customers.handphone1 = "0857887328"
    customers.latitude =
            -7.3403807
    customers.longitude = 112.6914085

   //get Data by Name,,
   @Query("SELECT * FROM customers WHERE name = :name")
   abstract fun findByName(name:String): MutableList<Customers>

   //How to retrieve data based on the closest distance ?
   @Query("SELECT ???")
   abstract fun findByDistance(mylatitude:Double,mylongitude:Double): MutableList<Customers>

请帮忙查找距离查询..

Answer 1

我通过计算直线距离找到了正确的查询。

@Query("SELECT * FROM customers ORDER BY ABS(latitude - :latitude) + ABS(longitude - :longitude) ASC")
abstract fun findByDistance(latitude:Double,longitude:Double): MutableList<Customers>

也许这可以帮助到和我有同样需求的你..谢谢..

如何根据房间持久性中的最近距离检索数据

how to retrieve data based on the closest distance in room persistance

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