thoerup/traininfoservice/StationDAO.java

package dk.thoerup.traininfoservice;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.logging.Logger;

import javax.jdo.PersistenceManager;

import dk.thoerup.android.traininfo.common.StationBean;
import dk.thoerup.android.traininfo.common.StationBean.StationEntry;
import dk.thoerup.traininfoservice.jdo.JdoStationBean;
import dk.thoerup.traininfoservice.jdo.PMF;

public class StationDAO {
        final static int LOCATION_LIMIT = 8;
        static final Logger logger = Logger.getLogger(StationDAO.class.getName());
        
        
        private StationEntry convertSingleRow(ResultSet res) throws SQLException {
                StationEntry station = new StationEntry();

                station.setId( res.getInt(1) );
                station.setName( res.getString(2) );
                station.setLatitude( res.getDouble(3) );
                station.setLongitude( res.getDouble(4) );
                station.setRegional( res.getString(5) );
                station.setStrain( res.getString(6) );
                station.setMetro( res.getString(7) );
                station.setAddress( res.getString(8) );
                station.setCalcdist( (int)res.getDouble(9) );
                
                station.setIsRegional( station.getRegional() != null );
                station.setIsStrain( station.getStrain() != null );
                station.setIsMetro( station.getMetro() != null );

                return station;
        }

        private StationBean convertResultset(ResultSet res) throws SQLException {
                StationBean stations = new StationBean();
                while (res.next()) {
                        stations.entries.add( convertSingleRow(res) );
                }
                return stations;

        }


        public JdoStationBean getById(int id) throws SQLException {

                PersistenceManager pm = null;
                
                try {
                        pm = PMF.get().getPersistenceManager();
                        return pm.getObjectById(JdoStationBean.class, new Integer(id) );
                } finally {
                        pm.close();
                }
        }

        /*
         * 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) )
         *     create function rlike(text,text) returns bool as 
         *     'select $2 ilike $1' language sql strict immutable;
         *     create operator ~~~ (procedure = rlike, leftarg = text, rightarg = text, commutator = ~~);
         */
        public StationBean getByName(String name) throws SQLException {
                String SQL = "SELECT id,name,latitude,longitude,stationcode_fjrn,stationcode_stog, stationcode_metro, address, 0.0 " + 
                "FROM trainstations " + 
                "WHERE (name ILIKE ? OR ? ~~~ ANY(aliases)) AND enabled = true " +
                "ORDER BY name ";


                StationBean result;
                Connection conn = null;
                PreparedStatement stmt = null;
                ResultSet res = null;
                try {
                        conn = DBConnection.getConnection();
                        stmt = conn.prepareStatement(SQL);

                        stmt.setString(1, name + "%");
                        stmt.setString(2, name + "%");

                        res = stmt.executeQuery();
                        result = convertResultset(res);

                } finally {
                        if (res != null)
                                res.close();
                        if (stmt != null)
                                stmt.close();
                        if (conn!= null)
                                conn.close();
                }
                return result;
        }

        //the "hack" with max 0.4 degrees latitude and 0.75 degrees longitude is only valid since we only service danish trains,
        // in denmark 0.4dg latitude ~ 44km, 0.75dg longitude ~ 47km

        // the ultra fast method  (and only slightly inaccurate as long as we only cover a limited geographically area)
        // is using an aproximation of the length of 1 latitude degree and 1 longitude degree and just use pythagoras to 
        // calculate the distance:
        //     sqrt( power(abs(latitude-?)*111320, 2) + power(abs(longitude-?)*63000,2) )::int as calcdist 

        public StationBean getByLocationWorker(double latitude, double longitude, boolean geolimit) throws SQLException {
                
                String limitExpression = (geolimit == true) ? "AND abs(latitude-?)<0.4 AND abs(longitude-?)<0.75 " : "";
                
                String SQL = "SELECT id,name,latitude,longitude,stationcode_fjrn,stationcode_stog, stationcode_metro, address, " + 
                        "earth_distance( earth_coord, ll_to_earth(?,?))::int AS calcdist " + 
                        "FROM trainstations " +
                        "WHERE enabled = true " + limitExpression +
                        "ORDER BY calcdist ASC " + 
                        "LIMIT " + LOCATION_LIMIT;


                StationBean result;
                Connection conn = null;
                PreparedStatement stmt = null;
                ResultSet res = null;
                try {
                        conn = DBConnection.getConnection();
                        stmt = conn.prepareStatement(SQL);
                        stmt.setDouble(1, latitude);
                        stmt.setDouble(2, longitude);
                        if (geolimit == true) {
                                stmt.setDouble(3, latitude);
                                stmt.setDouble(4, longitude);
                        }
                        res = stmt.executeQuery();
                        result = convertResultset(res);
                
                } finally {
                        if (res != null)
                                res.close();
                        if (stmt != null)
                                stmt.close();
                        if (conn!= null)
                                conn.close();
                }
                return result;
        }
        
        public StationBean getByLocation(double latitude, double longitude) throws SQLException {
                StationBean result = getByLocationWorker(latitude, longitude, true);
                
                if (result.entries.size() < LOCATION_LIMIT) { //failover
                        logger.info("getByLocation failover: " +latitude + "," + longitude);
                        
                        result = getByLocationWorker(latitude, longitude, false);
                }
                
                return result;
        }
        
        
        public StationBean getByList(String list) throws SQLException {
                String SQL = "SELECT id,name,latitude,longitude,stationcode_fjrn,stationcode_stog,stationcode_metro, address,0.0 " + 
                "FROM trainstations " + 
                "WHERE id IN " + list + " AND enabled = true " +
                "ORDER BY name ";

                Connection conn = null;
                Statement stmt = null;
                ResultSet res = null;
                StationBean result;

                try {
                        conn = DBConnection.getConnection();
                        stmt = conn.createStatement();
                        res = stmt.executeQuery(SQL);
                        result = convertResultset(res);
                } finally {
                        if (res != null)
                                res.close();
                        if (stmt != null)
                                stmt.close();
                        if (conn!= null)
                                conn.close();
                }

                return result;

        }
        public static String getStationName(int stationID) {
                String station = "";

                Connection conn = null;
                try {
                        conn = DBConnection.getConnection();
                        Statement stmt = conn.createStatement();
                        ResultSet rs = stmt.executeQuery("SELECT name FROM trainstations WHERE id=" + stationID);
                        if (rs.next()) {
                                station = rs.getString(1);
                        }

                } catch (Exception e) { 
                } finally {
                        try {
                                if (conn != null && !conn.isClosed())
                                        conn.close();
                        } catch (Exception e) {}
                }

                return station;
        }

        public int getIdByName(String name) throws SQLException {
                String SQL = "SELECT id,name,latitude,longitude,stationcode_fjrn,stationcode_stog, stationcode_metro, address, 0.0 " + 
                "FROM trainstations " + 
                "WHERE name = ?  AND enabled = true " +
                "LIMIT 1 ";

                StationBean result;
                Connection conn = null;
                PreparedStatement stmt = null;
                ResultSet res = null;
                try {
                        conn = DBConnection.getConnection();
                        stmt = conn.prepareStatement(SQL);

                        stmt.setString(1, name );

                        res = stmt.executeQuery();
                        result = convertResultset(res);

                } finally {
                        if (res != null)
                                res.close();
                        if (stmt != null)
                                stmt.close();
                        if (conn!= null)
                                conn.close();
                }

                if (result.entries.size() == 1) {
                        return result.entries.get(0).getId();
                } else {
                        return -1;
                }
        }
}
1	torben	588	package dk.thoerup.traininfoservice;
2
3			import java.sql.Connection;
4			import java.sql.PreparedStatement;
5			import java.sql.ResultSet;
6			import java.sql.SQLException;
7			import java.sql.Statement;
8	torben	895	import java.util.logging.Logger;
9	torben	588
10	torben	1093	import javax.jdo.PersistenceManager;
11
12	torben	1061	import dk.thoerup.android.traininfo.common.StationBean;
13			import dk.thoerup.android.traininfo.common.StationBean.StationEntry;
14	torben	1093	import dk.thoerup.traininfoservice.jdo.JdoStationBean;
15			import dk.thoerup.traininfoservice.jdo.PMF;
16	torben	1060
17	torben	588	public class StationDAO {
18	torben	997	final static int LOCATION_LIMIT = 8;
19	torben	895	static final Logger logger = Logger.getLogger(StationDAO.class.getName());
20	torben	841
21	torben	895
22	torben	1060	private StationEntry convertSingleRow(ResultSet res) throws SQLException {
23			StationEntry station = new StationEntry();
24	torben	836
25	torben	588	station.setId( res.getInt(1) );
26			station.setName( res.getString(2) );
27			station.setLatitude( res.getDouble(3) );
28			station.setLongitude( res.getDouble(4) );
29			station.setRegional( res.getString(5) );
30			station.setStrain( res.getString(6) );
31			station.setMetro( res.getString(7) );
32			station.setAddress( res.getString(8) );
33			station.setCalcdist( (int)res.getDouble(9) );
34	torben	1060
35			station.setIsRegional( station.getRegional() != null );
36			station.setIsStrain( station.getStrain() != null );
37			station.setIsMetro( station.getMetro() != null );
38	torben	836
39	torben	588	return station;
40			}
41	torben	836
42	torben	1060	private StationBean convertResultset(ResultSet res) throws SQLException {
43			StationBean stations = new StationBean();
44	torben	588	while (res.next()) {
45	torben	1060	stations.entries.add( convertSingleRow(res) );
46	torben	588	}
47			return stations;
48	torben	836
49	torben	588	}
50	torben	836
51
52	torben	1093	public JdoStationBean getById(int id) throws SQLException {
53	torben	836
54	torben	1093	PersistenceManager pm = null;
55
56	torben	588	try {
57	torben	1093	pm = PMF.get().getPersistenceManager();
58			return pm.getObjectById(JdoStationBean.class, new Integer(id) );
59	torben	588	} finally {
60	torben	1093	pm.close();
61	torben	588	}
62			}
63	torben	836
64	torben	714	/*
65			* 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) )
66			* create function rlike(text,text) returns bool as
67			* 'select $2 ilike $1' language sql strict immutable;
68	torben	836	* create operator ~~~ (procedure = rlike, leftarg = text, rightarg = text, commutator = ~~);
69	torben	714	*/
70	torben	1060	public StationBean getByName(String name) throws SQLException {
71	torben	588	String SQL = "SELECT id,name,latitude,longitude,stationcode_fjrn,stationcode_stog, stationcode_metro, address, 0.0 " +
72			"FROM trainstations " +
73	torben	714	"WHERE (name ILIKE ? OR ? ~~~ ANY(aliases)) AND enabled = true " +
74	torben	588	"ORDER BY name ";
75
76	torben	836
77	torben	1060	StationBean result;
78	torben	588	Connection conn = null;
79	torben	589	PreparedStatement stmt = null;
80			ResultSet res = null;
81	torben	588	try {
82			conn = DBConnection.getConnection();
83	torben	589	stmt = conn.prepareStatement(SQL);
84	torben	836
85	torben	588	stmt.setString(1, name + "%");
86	torben	714	stmt.setString(2, name + "%");
87	torben	836
88	torben	589	res = stmt.executeQuery();
89			result = convertResultset(res);
90	torben	836
91	torben	588	} finally {
92	torben	589	if (res != null)
93			res.close();
94			if (stmt != null)
95			stmt.close();
96			if (conn!= null)
97	torben	588	conn.close();
98			}
99			return result;
100			}
101	torben	836
102	torben	928	//the "hack" with max 0.4 degrees latitude and 0.75 degrees longitude is only valid since we only service danish trains,
103			// in denmark 0.4dg latitude ~ 44km, 0.75dg longitude ~ 47km
104	torben	836
105	torben	741	// the ultra fast method (and only slightly inaccurate as long as we only cover a limited geographically area)
106			// is using an aproximation of the length of 1 latitude degree and 1 longitude degree and just use pythagoras to
107			// calculate the distance:
108	torben	836	// sqrt( power(abs(latitude-?)111320, 2) + power(abs(longitude-?)63000,2) )::int as calcdist
109
110	torben	1060	public StationBean getByLocationWorker(double latitude, double longitude, boolean geolimit) throws SQLException {
111	torben	841
112	torben	929	String limitExpression = (geolimit == true) ? "AND abs(latitude-?)<0.4 AND abs(longitude-?)<0.75 " : "";
113	torben	841
114			String SQL = "SELECT id,name,latitude,longitude,stationcode_fjrn,stationcode_stog, stationcode_metro, address, " +
115			"earth_distance( earth_coord, ll_to_earth(?,?))::int AS calcdist " +
116			"FROM trainstations " +
117			"WHERE enabled = true " + limitExpression +
118			"ORDER BY calcdist ASC " +
119			"LIMIT " + LOCATION_LIMIT;
120	torben	849
121
122	torben	841
123	torben	1060	StationBean result;
124	torben	588	Connection conn = null;
125	torben	589	PreparedStatement stmt = null;
126			ResultSet res = null;
127	torben	588	try {
128			conn = DBConnection.getConnection();
129	torben	589	stmt = conn.prepareStatement(SQL);
130	torben	588	stmt.setDouble(1, latitude);
131			stmt.setDouble(2, longitude);
132	torben	841	if (geolimit == true) {
133			stmt.setDouble(3, latitude);
134			stmt.setDouble(4, longitude);
135			}
136	torben	589	res = stmt.executeQuery();
137			result = convertResultset(res);
138	torben	849
139	torben	588	} finally {
140	torben	589	if (res != null)
141			res.close();
142			if (stmt != null)
143			stmt.close();
144			if (conn!= null)
145	torben	588	conn.close();
146			}
147			return result;
148			}
149	torben	841
150	torben	1060	public StationBean getByLocation(double latitude, double longitude) throws SQLException {
151			StationBean result = getByLocationWorker(latitude, longitude, true);
152	torben	841
153	torben	1060	if (result.entries.size() < LOCATION_LIMIT) { //failover
154	torben	894	logger.info("getByLocation failover: " +latitude + "," + longitude);
155
156	torben	841	result = getByLocationWorker(latitude, longitude, false);
157			}
158
159			return result;
160			}
161
162
163	torben	836
164	torben	1060	public StationBean getByList(String list) throws SQLException {
165	torben	836	String SQL = "SELECT id,name,latitude,longitude,stationcode_fjrn,stationcode_stog,stationcode_metro, address,0.0 " +
166			"FROM trainstations " +
167			"WHERE id IN " + list + " AND enabled = true " +
168			"ORDER BY name ";
169
170			Connection conn = null;
171			Statement stmt = null;
172			ResultSet res = null;
173	torben	1060	StationBean result;
174	torben	836
175			try {
176			conn = DBConnection.getConnection();
177			stmt = conn.createStatement();
178			res = stmt.executeQuery(SQL);
179			result = convertResultset(res);
180			} finally {
181			if (res != null)
182			res.close();
183			if (stmt != null)
184			stmt.close();
185			if (conn!= null)
186			conn.close();
187			}
188
189			return result;
190
191			}
192			public static String getStationName(int stationID) {
193			String station = "";
194
195			Connection conn = null;
196			try {
197			conn = DBConnection.getConnection();
198			Statement stmt = conn.createStatement();
199			ResultSet rs = stmt.executeQuery("SELECT name FROM trainstations WHERE id=" + stationID);
200			if (rs.next()) {
201			station = rs.getString(1);
202			}
203
204			} catch (Exception e) {
205			} finally {
206	torben	588	try {
207	torben	836	if (conn != null && !conn.isClosed())
208	torben	588	conn.close();
209	torben	836	} catch (Exception e) {}
210			}
211	torben	650
212	torben	836	return station;
213			}
214	torben	650
215	torben	842	public int getIdByName(String name) throws SQLException {
216	torben	836	String SQL = "SELECT id,name,latitude,longitude,stationcode_fjrn,stationcode_stog, stationcode_metro, address, 0.0 " +
217			"FROM trainstations " +
218			"WHERE name = ? AND enabled = true " +
219			"LIMIT 1 ";
220	torben	650
221	torben	1060	StationBean result;
222	torben	836	Connection conn = null;
223			PreparedStatement stmt = null;
224			ResultSet res = null;
225			try {
226			conn = DBConnection.getConnection();
227			stmt = conn.prepareStatement(SQL);
228
229			stmt.setString(1, name );
230
231			res = stmt.executeQuery();
232			result = convertResultset(res);
233
234			} finally {
235			if (res != null)
236			res.close();
237			if (stmt != null)
238			stmt.close();
239			if (conn!= null)
240			conn.close();
241			}
242
243	torben	1060	if (result.entries.size() == 1) {
244			return result.entries.get(0).getId();
245	torben	836	} else {
246			return -1;
247			}
248			}
249	torben	588	}