/[projects]/android/TrainInfoService/src/dk/thoerup/traininfoservice/StationDAO.java
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revision 848 by torben, Tue Jun 15 05:33:14 2010 UTC revision 849 by torben, Tue Jun 15 05:46:38 2010 UTC
# Line 103  public class StationDAO { Line 103  public class StationDAO {
103                  return result;                  return result;
104          }          }
105    
106          //the "hack" with max 1.0 degrees latitude and 2.0 degrees longitude is only valid since we only service danish trains          //the "hack" with max 0.7 degrees latitude and 1.2 degrees longitude is only valid since we only service danish trains
107          // in denmark 1.0dg latitude ~ 110km, 2.0dg longitude ~ 120km          // in denmark 0.7dg latitude ~ 77km, 1.2dg longitude ~ 76km
108    
109          // the ultra fast method  (and only slightly inaccurate as long as we only cover a limited geographically area)          // the ultra fast method  (and only slightly inaccurate as long as we only cover a limited geographically area)
110          // is using an aproximation of the length of 1 latitude degree and 1 longitude degree and just use pythagoras to          // is using an aproximation of the length of 1 latitude degree and 1 longitude degree and just use pythagoras to
# Line 113  public class StationDAO { Line 113  public class StationDAO {
113    
114          public List<StationBean> getByLocationWorker(double latitude, double longitude, boolean geolimit) throws SQLException {          public List<StationBean> getByLocationWorker(double latitude, double longitude, boolean geolimit) throws SQLException {
115                                    
116                  String limitExpression = geolimit == true ? "AND abs(latitude-?)<1.0 AND abs(longitude-?)<2.0 " : "";                  String limitExpression = geolimit == true ? "AND abs(latitude-?)<0.7 AND abs(longitude-?)<1.2 " : "";
117                                    
118                  String SQL = "SELECT id,name,latitude,longitude,stationcode_fjrn,stationcode_stog, stationcode_metro, address, " +                  String SQL = "SELECT id,name,latitude,longitude,stationcode_fjrn,stationcode_stog, stationcode_metro, address, " +
119                          "earth_distance( earth_coord, ll_to_earth(?,?))::int AS calcdist " +                          "earth_distance( earth_coord, ll_to_earth(?,?))::int AS calcdist " +
# Line 121  public class StationDAO { Line 121  public class StationDAO {
121                          "WHERE enabled = true " + limitExpression +                          "WHERE enabled = true " + limitExpression +
122                          "ORDER BY calcdist ASC " +                          "ORDER BY calcdist ASC " +
123                          "LIMIT " + LOCATION_LIMIT;                          "LIMIT " + LOCATION_LIMIT;
124    
125    
126                                    
127                  List<StationBean> result;                  List<StationBean> result;
128                  Connection conn = null;                  Connection conn = null;
# Line 137  public class StationDAO { Line 139  public class StationDAO {
139                          }                          }
140                          res = stmt.executeQuery();                          res = stmt.executeQuery();
141                          result = convertResultset(res);                          result = convertResultset(res);
142                    
143                  } finally {                  } finally {
144                          if (res != null)                          if (res != null)
145                                  res.close();                                  res.close();
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