我有一个精炼的数据库,大约有100 000个浏览器,含有自动取款机的长度和纬度。 我愿在MKMapView上用纸张显示这一自动取款机。 但我认为,如果我一劳永逸地把所有坐标都从非行装,那是不好的。 这样做的最佳方式是什么?
你们绝对是正确的,不要一劳永逸地装着他们!
只使用一个捆绑箱来获得你希望显示的地图内的坐标。 对这一问题的答复: 核心 数据和核心位置
把上限和下限的相同概念只从目前可见的qlite返回。 你的问询会看好像什么。
SELECT * FROM atms WHERE lat > 51.4 and lat < 51.6 and lng > -0.165 and lng < -0.175
仅询问伦敦中部附近的ATM公司(51.5,-0.17)。
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