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