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package dk.thoerup.traininfoservice.db; |
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import java.sql.Array; |
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import java.sql.Connection; |
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import java.sql.PreparedStatement; |
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import java.sql.ResultSet; |
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import java.sql.SQLException; |
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import java.sql.Statement; |
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import java.util.logging.Logger; |
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import dk.thoerup.android.traininfo.common.StationBean; |
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import dk.thoerup.android.traininfo.common.StationEntry; |
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|
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public class StationDAO { |
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|
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private interface StatementParamSetter { |
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public void setParams(PreparedStatement stmt) throws SQLException ; |
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} |
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private class NullSetter implements StatementParamSetter { |
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@Override |
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public void setParams(PreparedStatement stmt) throws SQLException {} |
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} |
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|
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public static class NostationException extends Exception { |
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private static final long serialVersionUID = 1L; |
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} |
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|
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final static int LOCATION_LIMIT = 8; |
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static final Logger logger = Logger.getLogger(StationDAO.class.getName()); |
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|
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private StationEntry convertSingleRow(ResultSet res) throws SQLException { |
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StationEntry station = new StationEntry(); |
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station.setId( res.getInt(1) ); |
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station.setName( res.getString(2) ); |
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station.setLatitude( res.getDouble(3) ); |
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station.setLongitude( res.getDouble(4) ); |
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station.setRegional( res.getString(5) ); |
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station.setStrain( res.getString(6) ); |
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station.setMetro( res.getString(7) ); |
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station.setAddress( res.getString(8) ); |
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station.setCalcdist( (int)res.getDouble(9) ); |
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|
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station.setIsRegional( station.getRegional() != null ); |
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station.setIsStrain( station.getStrain() != null ); |
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station.setIsMetro( station.getMetro() != null ); |
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return station; |
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} |
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private StationBean convertResultset(ResultSet res) throws SQLException { |
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StationBean stations = new StationBean(); |
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while (res.next()) { |
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stations.entries.add( convertSingleRow(res) ); |
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} |
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return stations; |
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|
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} |
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private StationBean fetchStations(String SQL, StatementParamSetter setter) throws SQLException { |
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StationBean stations; |
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Connection conn = null; |
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PreparedStatement stmt = null; |
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ResultSet res = null; |
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try { |
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conn = DBConnection.getConnection(); |
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stmt = conn.prepareStatement(SQL); |
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setter.setParams(stmt); |
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res = stmt.executeQuery(); |
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stations = convertResultset(res); |
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|
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} finally { |
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if (res != null) |
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res.close(); |
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if (stmt != null) |
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stmt.close(); |
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if (conn!= null) |
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conn.close(); |
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} |
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return stations; |
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|
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} |
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public StationEntry getById(int id) throws SQLException,NostationException { |
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String SQL = "SELECT id,name,latitude,longitude,stationcode_fjrn,stationcode_stog,stationcode_metro,address,0.0 " + |
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"FROM trainstations WHERE id=" + id + " AND enabled=true"; |
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StationBean stations = fetchStations(SQL, new NullSetter() ); |
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if (stations.entries.size() > 0 ) { |
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return stations.entries.get(0); |
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} else { |
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throw new NostationException(); |
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} |
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} |
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|
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/* |
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* this code requires theses statements are run on database in order to do ILIKE searches against aliases (which is defines as array of varchar(64) ) |
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* create function rlike(text,text) returns bool as |
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* 'select $2 ilike $1' language sql strict immutable; |
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* create operator ~~~ (procedure = rlike, leftarg = text, rightarg = text, commutator = ~~); |
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*/ |
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public StationBean getByName(final String name) throws SQLException { |
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String SQL = "SELECT id,name,latitude,longitude,stationcode_fjrn,stationcode_stog, stationcode_metro, address, 0.0 " + |
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"FROM trainstations " + |
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"WHERE (name ILIKE ? OR ? ~~~ ANY(aliases)) AND enabled = true " + |
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"ORDER BY name "; |
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|
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class NameSetter implements StatementParamSetter { |
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@Override |
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public void setParams(PreparedStatement stmt) throws SQLException { |
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stmt.setString(1, name + "%"); |
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stmt.setString(2, name + "%"); |
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} |
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} |
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return fetchStations(SQL, new NameSetter() ); |
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} |
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//Latitude (horizonal), longitude(vertical) so |
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// 1 degree latitude is ~ 111320 meters, since the distance between the horizonal lines is always the same |
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// 1 degree longitude is ~111320 meters at equator but gets shorter as we get closer to the poles. |
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// the "hack" with max 0.4 degrees latitude and 0.75 degrees longitude is only valid since we only service danish trains, |
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// in denmark 0.4dg latitude ~ 44km, 0.75dg longitude ~ 47km |
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|
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// the ultra fast method (and only slightly inaccurate as long as we only cover a limited geographically area) |
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// is using an aproximation of the length of 1 latitude degree and 1 longitude degree and just use pythagoras to |
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// calculate the distance: |
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// sqrt( power(abs(latitude-?)*111320, 2) + power(abs(longitude-?)*63000,2) )::int as calcdist |
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public StationBean getByLocationWorker(final double latitude, final double longitude, final boolean geolimit) throws SQLException { |
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String limitExpression = (geolimit == true) ? "AND abs(latitude-?)<0.4 AND abs(longitude-?)<0.75 " : ""; |
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String SQL = "SELECT id,name,latitude,longitude,stationcode_fjrn,stationcode_stog, stationcode_metro, address, " + |
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"earth_distance( earth_coord, ll_to_earth(?,?))::int AS calcdist " + |
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"FROM trainstations " + |
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"WHERE enabled = true " + limitExpression + |
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"ORDER BY calcdist ASC " + |
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"LIMIT " + LOCATION_LIMIT; |
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|
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|
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class LatlongSetter implements StatementParamSetter { |
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@Override |
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public void setParams(PreparedStatement stmt) throws SQLException { |
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stmt.setDouble(1, latitude); |
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stmt.setDouble(2, longitude); |
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if (geolimit == true) { |
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stmt.setDouble(3, latitude); |
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stmt.setDouble(4, longitude); |
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} |
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} |
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} |
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return fetchStations(SQL, new LatlongSetter() ); |
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} |
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public StationBean getByLocation(double latitude, double longitude) throws SQLException { |
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StationBean result = getByLocationWorker(latitude, longitude, true); |
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if (result.entries.size() < LOCATION_LIMIT) { //failover |
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logger.info("getByLocation failover: " +latitude + "," + longitude); |
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result = getByLocationWorker(latitude, longitude, false); |
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} |
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return result; |
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} |
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public StationBean getByList(String list) throws SQLException { |
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String SQL = "SELECT id,name,latitude,longitude,stationcode_fjrn,stationcode_stog,stationcode_metro, address,0.0 " + |
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"FROM trainstations " + |
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"WHERE id IN " + list + " AND enabled = true " + |
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"ORDER BY name "; |
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return fetchStations(SQL, new NullSetter() ); |
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} |
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public StationEntry getSimpleByName(final String name) throws SQLException { |
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String SQL = "SELECT id,name,latitude,longitude,stationcode_fjrn,stationcode_stog, stationcode_metro, address, 0.0 " + |
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"FROM trainstations " + |
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"WHERE name = ? AND enabled = true " + |
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"LIMIT 1 "; |
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class NameSetter implements StatementParamSetter { |
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@Override |
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public void setParams(PreparedStatement stmt) throws SQLException { |
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stmt.setString(1, name ); |
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} |
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} |
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StationBean stations = fetchStations(SQL, new NameSetter() ); |
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if (stations.entries.size() == 1) { |
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return stations.entries.get(0); |
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} else { |
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return null; |
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} |
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} |
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|
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//used to create full dump in order to populate Google Appengine DB |
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@Deprecated |
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public StationBean dumpAll() throws SQLException { |
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String SQL = "SELECT id,name,latitude,longitude,stationcode_fjrn,stationcode_stog,stationcode_metro,address,0.0,aliases " + |
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"FROM trainstations WHERE enabled = true ORDER BY id"; |
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|
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Connection conn = null; |
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Statement stmt = null; |
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ResultSet res = null; |
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|
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|
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try { |
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conn = DBConnection.getConnection(); |
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stmt = conn.createStatement(); |
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res = stmt.executeQuery(SQL); |
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// Does mostly the same as convertResultset() |
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StationBean stations = new StationBean(); |
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while (res.next()) { |
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StationEntry entry = convertSingleRow(res); |
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Array arr = res.getArray(10); |
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if (arr != null) { |
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String[] aliases = (String[]) arr.getArray(); |
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entry.setAliases(aliases); |
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} |
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stations.entries.add( entry ); |
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} |
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return stations; |
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} finally { |
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if (res != null) |
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res.close(); |
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if (stmt != null) |
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stmt.close(); |
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if (conn != null) |
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conn.close(); |
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} |
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|
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} |
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|
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@Deprecated |
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public static String getStationName(int stationID) { |
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String station = ""; |
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Connection conn = null; |
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try { |
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conn = DBConnection.getConnection(); |
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Statement stmt = conn.createStatement(); |
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ResultSet rs = stmt.executeQuery("SELECT name FROM trainstations WHERE id=" + stationID); |
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if (rs.next()) { |
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station = rs.getString(1); |
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} |
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|
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} catch (Exception e) { |
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} finally { |
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try { |
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if (conn != null && !conn.isClosed()) |
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conn.close(); |
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} catch (Exception e) {} |
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} |
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return station; |
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} |
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@Deprecated |
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public int getIdByName(final String name) throws SQLException { |
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String SQL = "SELECT id,name,latitude,longitude,stationcode_fjrn,stationcode_stog, stationcode_metro, address, 0.0 " + |
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"FROM trainstations " + |
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"WHERE name = ? AND enabled = true " + |
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"LIMIT 1 "; |
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|
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class NameSetter implements StatementParamSetter { |
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@Override |
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public void setParams(PreparedStatement stmt) throws SQLException { |
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stmt.setString(1, name ); |
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} |
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} |
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StationBean stations = fetchStations(SQL, new NameSetter() ); |
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if (stations.entries.size() == 1) { |
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return stations.entries.get(0).getId(); |
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} else { |
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return -1; |
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} |
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} |
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} |