SQLalchemy - 用于查询float列

我想从ajax查询我的数据库中的记录，例如浮点变量（地图坐标）（查询float列）。我不知道，如果类似的方法可以查询不是字符串数据类型，因为这个没有工作......SQLalchemy - 用于查询float列

data = json.loads(request.data) 

     markers = session.query(Markers) \ 
     .filter(Markers.lat.like('%' + data['lat'] + '%')) \ 
     .filter(Markers.lng.like('%' + data['lng'] + '%')) \ 
     .order_by(func.random()).limit(7).all() 

     if len(markers) <= 0: 
      return jsonify(resp = 'no results') 
     else: 
      return jsonify(resp = 'markers', markers = [m.serialize for m in markers])

我甚至试图使其与STR（）的字符串，但仍获得此错误：

ProgrammingError: (ProgrammingError) operator does not exist: double precision ~~ unknown 
LINE 3: WHERE markers.lat LIKE '%%' AND markers.lng LIKE '%%' ORDER ... 
         ^
HINT: No operator matches the given name and argument type(s). You might need to add explicit type casts. 
'SELECT markers.id AS markers_id, markers.type AS markers_type, markers.name AS markers_name, markers.location AS markers_location, markers.lat AS markers_lat, markers.lng AS markers_lng, markers.icon AS markers_icon, markers.message AS markers_message, markers.date AS markers_date, markers.place_id AS markers_place_id, markers.owner AS markers_owner \nFROM markers \nWHERE markers.lat LIKE %(lat_1)s AND markers.lng LIKE %(lng_1)s ORDER BY random() \n LIMIT %(param_1)s' {'lng_1': '%%', 'param_1': 7, 'lat_1': '%%'}

怎么回事？ sqlalchemy func模块是否有将查询float列作为字符串的方法？我该如何解决？谢谢！

P.S我使用PostgreSQL的

来源

2016-08-25 ryanwaite28

你需要投浮到字符串

from sqlalchemy import cast, String 

markers = session.query(Markers) \ 
     .filter(cast(Markers.lat, String()).like('%' + data['lat'] + '%'))

来源

2016-08-25 19:07:41

我会给它一个try.Thanks！ – ryanwaite28

谢谢，它工作完美！ – ryanwaite28

SQLalchemy - 用于查询float列

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