/[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 928 by torben, Sun Jun 27 16:55:36 2010 UTC
# Line 7  import java.sql.SQLException; Line 7  import java.sql.SQLException;
7  import java.sql.Statement;  import java.sql.Statement;
8  import java.util.ArrayList;  import java.util.ArrayList;
9  import java.util.List;  import java.util.List;
10    import java.util.logging.Logger;
11    
12  public class StationDAO {  public class StationDAO {
13          final static int LOCATION_LIMIT = 5;          final static int LOCATION_LIMIT = 5;
14            static final Logger logger = Logger.getLogger(StationDAO.class.getName());
15            
16                    
17          private StationBean convertSingleRow(ResultSet res) throws SQLException {          private StationBean convertSingleRow(ResultSet res) throws SQLException {
18                  StationBean station = new StationBean();                  StationBean station = new StationBean();
# Line 103  public class StationDAO { Line 106  public class StationDAO {
106                  return result;                  return result;
107          }          }
108    
109          //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 0.4 degrees latitude and 0.75 degrees longitude is only valid since we only service danish trains,
110          // in denmark 1.0dg latitude ~ 110km, 2.0dg longitude ~ 120km          // in denmark 0.4dg latitude ~ 44km, 0.75dg longitude ~ 47km
111    
112          // 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)
113          // 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 116  public class StationDAO {
116    
117          public List<StationBean> getByLocationWorker(double latitude, double longitude, boolean geolimit) throws SQLException {          public List<StationBean> getByLocationWorker(double latitude, double longitude, boolean geolimit) throws SQLException {
118                                    
119                  String limitExpression = geolimit == true ? "AND abs(latitude-?)<1.0 AND abs(longitude-?)<2.0 " : "";                  String limitExpression = geolimit == true ? "AND abs(latitude-?)<0.4 AND abs(longitude-?)<0.75 " : "";
120                                    
121                  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, " +
122                          "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 124  public class StationDAO {
124                          "WHERE enabled = true " + limitExpression +                          "WHERE enabled = true " + limitExpression +
125                          "ORDER BY calcdist ASC " +                          "ORDER BY calcdist ASC " +
126                          "LIMIT " + LOCATION_LIMIT;                          "LIMIT " + LOCATION_LIMIT;
127    
128    
129                                    
130                  List<StationBean> result;                  List<StationBean> result;
131                  Connection conn = null;                  Connection conn = null;
# Line 137  public class StationDAO { Line 142  public class StationDAO {
142                          }                          }
143                          res = stmt.executeQuery();                          res = stmt.executeQuery();
144                          result = convertResultset(res);                          result = convertResultset(res);
145                    
146                  } finally {                  } finally {
147                          if (res != null)                          if (res != null)
148                                  res.close();                                  res.close();
# Line 153  public class StationDAO { Line 158  public class StationDAO {
158                  List<StationBean> result = getByLocationWorker(latitude, longitude, true);                  List<StationBean> result = getByLocationWorker(latitude, longitude, true);
159                                    
160                  if (result.size() < LOCATION_LIMIT) { //failover                  if (result.size() < LOCATION_LIMIT) { //failover
161                            logger.info("getByLocation failover: " +latitude + "," + longitude);
162                            
163                          result = getByLocationWorker(latitude, longitude, false);                          result = getByLocationWorker(latitude, longitude, false);
164                  }                  }
165                                    
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