thoerup/traininfoservice/StationDAO.java

package dk.thoerup.traininfoservice;

import java.sql.Array;
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 dk.thoerup.android.traininfo.common.StationBean;
import dk.thoerup.android.traininfo.common.StationBean.StationEntry;

public class StationDAO {
        
        public static class NostationException extends Exception {
                private static final long serialVersionUID = 1L;
        }
        
        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 StationEntry getById(int id) throws SQLException,NostationException {
                String SQL = "SELECT id,name,latitude,longitude,stationcode_fjrn,stationcode_stog,stationcode_metro,address,0.0 " +
                "FROM trainstations WHERE id=" + id + " AND enabled=true";

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

                try {
                        conn = DBConnection.getConnection();

                        stmt = conn.createStatement();
                        res = stmt.executeQuery(SQL);
                        
                        if (res.next()) {
                                result = convertSingleRow(res);
                        } else {
                                throw new NostationException();
                        }
                } finally {
                        if (res != null)
                                res.close();
                        if (stmt != null)
                                stmt.close();
                        if (conn != null)
                                conn.close();
                }

                return result;
        }
        
        public StationBean dumpAll() throws SQLException {
                
                String SQL = "SELECT id,name,latitude,longitude,stationcode_fjrn,stationcode_stog,stationcode_metro,address,0.0,aliases " +
                                "FROM trainstations WHERE enabled = true ORDER BY id";
                
                Connection conn = null;
                Statement stmt = null;
                ResultSet res = null;           

                
                try {
                        conn = DBConnection.getConnection();

                        stmt = conn.createStatement();
                        res = stmt.executeQuery(SQL);           
                                                
                        // Does mostly the same as convertResultset()
                        StationBean stations = new StationBean();
                        while (res.next()) {
                                StationEntry entry = convertSingleRow(res);
                                
                                Array arr = res.getArray(10);
                                if (arr != null) {
                                        String[] aliases = (String[]) arr.getArray();
                                        entry.setAliases(aliases);
                                }
                                
                                stations.entries.add( entry );
                                
                        }
                        return stations;
                        

                } finally {
                        if (res != null)
                                res.close();
                        if (stmt != null)
                                stmt.close();
                        if (conn != null)
                                conn.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	torben	1082	import java.sql.Array;
4	torben	588	import java.sql.Connection;
5			import java.sql.PreparedStatement;
6			import java.sql.ResultSet;
7			import java.sql.SQLException;
8			import java.sql.Statement;
9	torben	895	import java.util.logging.Logger;
10	torben	588
11	torben	1061	import dk.thoerup.android.traininfo.common.StationBean;
12			import dk.thoerup.android.traininfo.common.StationBean.StationEntry;
13	torben	1060
14	torben	588	public class StationDAO {
15	torben	1145
16			public static class NostationException extends Exception {
17			private static final long serialVersionUID = 1L;
18			}
19
20	torben	997	final static int LOCATION_LIMIT = 8;
21	torben	895	static final Logger logger = Logger.getLogger(StationDAO.class.getName());
22	torben	841
23	torben	895
24	torben	1060	private StationEntry convertSingleRow(ResultSet res) throws SQLException {
25			StationEntry station = new StationEntry();
26	torben	836
27	torben	588	station.setId( res.getInt(1) );
28			station.setName( res.getString(2) );
29			station.setLatitude( res.getDouble(3) );
30			station.setLongitude( res.getDouble(4) );
31			station.setRegional( res.getString(5) );
32			station.setStrain( res.getString(6) );
33			station.setMetro( res.getString(7) );
34			station.setAddress( res.getString(8) );
35			station.setCalcdist( (int)res.getDouble(9) );
36	torben	1060
37			station.setIsRegional( station.getRegional() != null );
38			station.setIsStrain( station.getStrain() != null );
39			station.setIsMetro( station.getMetro() != null );
40	torben	836
41	torben	588	return station;
42			}
43	torben	836
44	torben	1060	private StationBean convertResultset(ResultSet res) throws SQLException {
45			StationBean stations = new StationBean();
46	torben	588	while (res.next()) {
47	torben	1060	stations.entries.add( convertSingleRow(res) );
48	torben	588	}
49			return stations;
50	torben	836
51	torben	588	}
52	torben	836
53
54	torben	1145	public StationEntry getById(int id) throws SQLException,NostationException {
55	torben	588	String SQL = "SELECT id,name,latitude,longitude,stationcode_fjrn,stationcode_stog,stationcode_metro,address,0.0 " +
56	torben	836	"FROM trainstations WHERE id=" + id + " AND enabled=true";
57
58	torben	588	Connection conn = null;
59	torben	589	Statement stmt = null;
60			ResultSet res = null;
61	torben	1060	StationEntry result;
62	torben	836
63	torben	588	try {
64			conn = DBConnection.getConnection();
65	torben	836
66	torben	589	stmt = conn.createStatement();
67	torben	1145	res = stmt.executeQuery(SQL);
68
69			if (res.next()) {
70			result = convertSingleRow(res);
71			} else {
72			throw new NostationException();
73			}
74	torben	588	} finally {
75	torben	589	if (res != null)
76			res.close();
77			if (stmt != null)
78			stmt.close();
79	torben	588	if (conn != null)
80			conn.close();
81			}
82	torben	836
83	torben	588	return result;
84			}
85	torben	1082
86			public StationBean dumpAll() throws SQLException {
87
88			String SQL = "SELECT id,name,latitude,longitude,stationcode_fjrn,stationcode_stog,stationcode_metro,address,0.0,aliases " +
89			"FROM trainstations WHERE enabled = true ORDER BY id";
90
91			Connection conn = null;
92			Statement stmt = null;
93			ResultSet res = null;
94	torben	836
95	torben	1082
96			try {
97			conn = DBConnection.getConnection();
98
99			stmt = conn.createStatement();
100			res = stmt.executeQuery(SQL);
101
102			// Does mostly the same as convertResultset()
103			StationBean stations = new StationBean();
104			while (res.next()) {
105			StationEntry entry = convertSingleRow(res);
106
107			Array arr = res.getArray(10);
108			if (arr != null) {
109			String[] aliases = (String[]) arr.getArray();
110			entry.setAliases(aliases);
111			}
112
113			stations.entries.add( entry );
114
115			}
116			return stations;
117
118
119			} finally {
120			if (res != null)
121			res.close();
122			if (stmt != null)
123			stmt.close();
124			if (conn != null)
125			conn.close();
126			}
127
128			}
129
130	torben	714	/*
131			* 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) )
132			* create function rlike(text,text) returns bool as
133			* 'select $2 ilike $1' language sql strict immutable;
134	torben	836	* create operator ~~~ (procedure = rlike, leftarg = text, rightarg = text, commutator = ~~);
135	torben	714	*/
136	torben	1060	public StationBean getByName(String name) throws SQLException {
137	torben	588	String SQL = "SELECT id,name,latitude,longitude,stationcode_fjrn,stationcode_stog, stationcode_metro, address, 0.0 " +
138			"FROM trainstations " +
139	torben	714	"WHERE (name ILIKE ? OR ? ~~~ ANY(aliases)) AND enabled = true " +
140	torben	588	"ORDER BY name ";
141
142	torben	836
143	torben	1060	StationBean result;
144	torben	588	Connection conn = null;
145	torben	589	PreparedStatement stmt = null;
146			ResultSet res = null;
147	torben	588	try {
148			conn = DBConnection.getConnection();
149	torben	589	stmt = conn.prepareStatement(SQL);
150	torben	836
151	torben	588	stmt.setString(1, name + "%");
152	torben	714	stmt.setString(2, name + "%");
153	torben	836
154	torben	589	res = stmt.executeQuery();
155			result = convertResultset(res);
156	torben	836
157	torben	588	} finally {
158	torben	589	if (res != null)
159			res.close();
160			if (stmt != null)
161			stmt.close();
162			if (conn!= null)
163	torben	588	conn.close();
164			}
165			return result;
166			}
167	torben	836
168	torben	928	//the "hack" with max 0.4 degrees latitude and 0.75 degrees longitude is only valid since we only service danish trains,
169			// in denmark 0.4dg latitude ~ 44km, 0.75dg longitude ~ 47km
170	torben	836
171	torben	741	// the ultra fast method (and only slightly inaccurate as long as we only cover a limited geographically area)
172			// is using an aproximation of the length of 1 latitude degree and 1 longitude degree and just use pythagoras to
173			// calculate the distance:
174	torben	836	// sqrt( power(abs(latitude-?)111320, 2) + power(abs(longitude-?)63000,2) )::int as calcdist
175
176	torben	1060	public StationBean getByLocationWorker(double latitude, double longitude, boolean geolimit) throws SQLException {
177	torben	841
178	torben	929	String limitExpression = (geolimit == true) ? "AND abs(latitude-?)<0.4 AND abs(longitude-?)<0.75 " : "";
179	torben	841
180			String SQL = "SELECT id,name,latitude,longitude,stationcode_fjrn,stationcode_stog, stationcode_metro, address, " +
181			"earth_distance( earth_coord, ll_to_earth(?,?))::int AS calcdist " +
182			"FROM trainstations " +
183			"WHERE enabled = true " + limitExpression +
184			"ORDER BY calcdist ASC " +
185			"LIMIT " + LOCATION_LIMIT;
186	torben	849
187
188	torben	841
189	torben	1060	StationBean result;
190	torben	588	Connection conn = null;
191	torben	589	PreparedStatement stmt = null;
192			ResultSet res = null;
193	torben	588	try {
194			conn = DBConnection.getConnection();
195	torben	589	stmt = conn.prepareStatement(SQL);
196	torben	588	stmt.setDouble(1, latitude);
197			stmt.setDouble(2, longitude);
198	torben	841	if (geolimit == true) {
199			stmt.setDouble(3, latitude);
200			stmt.setDouble(4, longitude);
201			}
202	torben	589	res = stmt.executeQuery();
203			result = convertResultset(res);
204	torben	849
205	torben	588	} finally {
206	torben	589	if (res != null)
207			res.close();
208			if (stmt != null)
209			stmt.close();
210			if (conn!= null)
211	torben	588	conn.close();
212			}
213			return result;
214			}
215	torben	841
216	torben	1060	public StationBean getByLocation(double latitude, double longitude) throws SQLException {
217			StationBean result = getByLocationWorker(latitude, longitude, true);
218	torben	841
219	torben	1060	if (result.entries.size() < LOCATION_LIMIT) { //failover
220	torben	894	logger.info("getByLocation failover: " +latitude + "," + longitude);
221
222	torben	841	result = getByLocationWorker(latitude, longitude, false);
223			}
224
225			return result;
226			}
227
228
229	torben	836
230	torben	1060	public StationBean getByList(String list) throws SQLException {
231	torben	836	String SQL = "SELECT id,name,latitude,longitude,stationcode_fjrn,stationcode_stog,stationcode_metro, address,0.0 " +
232			"FROM trainstations " +
233			"WHERE id IN " + list + " AND enabled = true " +
234			"ORDER BY name ";
235
236			Connection conn = null;
237			Statement stmt = null;
238			ResultSet res = null;
239	torben	1060	StationBean result;
240	torben	836
241			try {
242			conn = DBConnection.getConnection();
243			stmt = conn.createStatement();
244			res = stmt.executeQuery(SQL);
245			result = convertResultset(res);
246			} finally {
247			if (res != null)
248			res.close();
249			if (stmt != null)
250			stmt.close();
251			if (conn!= null)
252			conn.close();
253			}
254
255			return result;
256
257			}
258			public static String getStationName(int stationID) {
259			String station = "";
260
261			Connection conn = null;
262			try {
263			conn = DBConnection.getConnection();
264			Statement stmt = conn.createStatement();
265			ResultSet rs = stmt.executeQuery("SELECT name FROM trainstations WHERE id=" + stationID);
266			if (rs.next()) {
267			station = rs.getString(1);
268			}
269
270			} catch (Exception e) {
271			} finally {
272	torben	588	try {
273	torben	836	if (conn != null && !conn.isClosed())
274	torben	588	conn.close();
275	torben	836	} catch (Exception e) {}
276			}
277	torben	650
278	torben	836	return station;
279			}
280	torben	650
281	torben	842	public int getIdByName(String name) throws SQLException {
282	torben	836	String SQL = "SELECT id,name,latitude,longitude,stationcode_fjrn,stationcode_stog, stationcode_metro, address, 0.0 " +
283			"FROM trainstations " +
284			"WHERE name = ? AND enabled = true " +
285			"LIMIT 1 ";
286	torben	650
287	torben	1060	StationBean result;
288	torben	836	Connection conn = null;
289			PreparedStatement stmt = null;
290			ResultSet res = null;
291			try {
292			conn = DBConnection.getConnection();
293			stmt = conn.prepareStatement(SQL);
294
295			stmt.setString(1, name );
296
297			res = stmt.executeQuery();
298			result = convertResultset(res);
299
300			} finally {
301			if (res != null)
302			res.close();
303			if (stmt != null)
304			stmt.close();
305			if (conn!= null)
306			conn.close();
307			}
308
309	torben	1060	if (result.entries.size() == 1) {
310			return result.entries.get(0).getId();
311	torben	836	} else {
312			return -1;
313			}
314			}
315	torben	588	}