traininfoservice/db/StationDAO.java

package dk.thoerup.traininfoservice.db;

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.Collections;
import java.util.Comparator;
import java.util.logging.Logger;

import dk.thoerup.android.traininfo.common.StationBean;
import dk.thoerup.android.traininfo.common.StationEntry;

public class StationDAO {
        
        private interface StatementParamSetter {
                public void setParams(PreparedStatement stmt) throws SQLException ;
        }
        private class NullSetter implements StatementParamSetter {
                @Override
                public void setParams(PreparedStatement stmt) throws SQLException {}
        }
        
        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 );
                
                Array aliases = res.getArray( 10);
                if (aliases != null) {
                        station.setAliases( (String[]) aliases.getArray() );
                } else {
                        String[] emptyArray = {};
                        station.setAliases( emptyArray );
                }

                return station;
        }

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

        }

        private StationBean fetchStations(String SQL, StatementParamSetter setter) throws SQLException {
                StationBean stations;
                Connection conn = null;
                PreparedStatement stmt = null;
                ResultSet res = null;
                try {
                        conn = DBConnection.getConnection();
                        stmt = conn.prepareStatement(SQL);
                        
                        setter.setParams(stmt);

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

                } finally {
                        if (res != null)
                                res.close();
                        if (stmt != null)
                                stmt.close();
                        if (conn!= null)
                                conn.close();
                }
                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,aliases " +
                "FROM trainstations WHERE id=" + id + " AND enabled=true";
                                
                StationBean stations =  fetchStations(SQL, new NullSetter() );
                
                if (stations.entries.size() > 0 ) {
                        return stations.entries.get(0);
                } else {
                        throw new NostationException();
                }
        }
        

        /*
         * 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 getByNameNormal(final String name) throws SQLException {
                String SQL = "SELECT id,name,latitude,longitude,stationcode_fjrn,stationcode_stog, stationcode_metro, address, 0.0,aliases " + 
                "FROM trainstations " + 
                "WHERE (name ILIKE ? OR ? ~~~ ANY(aliases)) AND enabled = true " +
                "ORDER BY name ";

                class NameSetter implements StatementParamSetter {
                        @Override
                        public void setParams(PreparedStatement stmt) throws SQLException {
                                stmt.setString(1, name + "%");
                                stmt.setString(2, name + "%");                          
                        }                       
                }
                
                return fetchStations(SQL, new NameSetter() );
        }
        
        
        public StationBean getByNameFuzzy(final String name) throws SQLException {
                String SQL = "SELECT * FROM (" +
                                         "    SELECT id,name,latitude,longitude,stationcode_fjrn,stationcode_stog, stationcode_metro, address, 0.0, aliases, " +
                                         "    levenshtein(lower(name),lower(?) ) as leven " +
                                         "    FROM trainstations " +
                                         "    WHERE  enabled = true ) as lev2 " +
                                         "WHERE (leven <= 3) " +                
                                         "ORDER BY leven " + 
                                         "LIMIT 1";

                class NameSetter implements StatementParamSetter {
                        @Override
                        public void setParams(PreparedStatement stmt) throws SQLException {
                                stmt.setString(1, name );
                        }                       
                }
                
                StationBean stations = fetchStations(SQL, new NameSetter() );
                stations.fuzzystrmatch = true;
                return stations;
        }
        
        private String removeSuffix(String str, String suffix) {
                if (str.endsWith(suffix)) {
                        return str.substring(0, str.length() - suffix.length() );
                } else {
                        return str;
                }
        }
        
        public StationBean getByName(String name) throws SQLException {
                name = removeSuffix(name, " st.");
                name = removeSuffix(name, " st");
                name = removeSuffix(name, " station");
                
                StationBean stations = getByNameNormal(name);
                
                if (stations.entries.size() == 0) {
                        stations = getByNameFuzzy(name);

                        logger.info("getByName failover: " + name + "(" + (stations.entries.size() >0) + ")" );
                }
                return stations;
        }
        
        
        //Latitude (horizonal), longitude(vertical) so
        // 1 degree latitude is ~ 111320 meters, since the distance between the horizonal lines is always the same 
        // 1 degree longitude is ~111320 meters at equator but gets shorter as we get closer to the poles.
        // so 1 degree longitude is 64.5 km at denmarks southern point (gedser=54.55,11.95)
        // and is 59.4km at northern point (skagen = 57.75,10.65)
        // 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(final double latitude, final double longitude, final 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,aliases " + 
                        "FROM trainstations " +
                        "WHERE enabled = true " + limitExpression +
                        "ORDER BY calcdist ASC " + 
                        "LIMIT " + LOCATION_LIMIT;

                
                class LatlongSetter implements StatementParamSetter {
                        @Override
                        public void setParams(PreparedStatement stmt) throws SQLException {
                                stmt.setDouble(1, latitude);
                                stmt.setDouble(2, longitude);
                                if (geolimit == true) {
                                        stmt.setDouble(3, latitude);
                                        stmt.setDouble(4, longitude);
                                }                               
                        }                       
                }
                
                return fetchStations(SQL, new LatlongSetter() );
        }
        
        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,aliases " + 
                "FROM trainstations " + 
                "WHERE id IN " + list + " AND enabled = true " +
                "ORDER BY name ";
                
                return fetchStations(SQL, new NullSetter() );
        }
        

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

                class NameSetter implements StatementParamSetter {
                        @Override
                        public void setParams(PreparedStatement stmt) throws SQLException {
                                stmt.setString(1, name );
                        }                       
                }
                
                StationBean stations = fetchStations(SQL, new NameSetter() );
                
                if (stations.entries.size() == 1) {
                        return stations.entries.get(0);
                } else {
                        return null;
                }
        }
        
        Comparator<StationEntry> nameComparator = new Comparator<StationEntry>() {
                @Override
                public int compare(StationEntry arg0, StationEntry arg1) {
                        return arg0.getName().compareTo( arg1.getName() );
                }               
        };
        
        //used to create full dump in order to populate Google Appengine DB
        //after 1.1.0 also used to populate client-side station list
        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";
                
                
                StationBean stations = fetchStations(SQL, new NullSetter() );
                Collections.sort( stations.entries,nameComparator );
                
                return stations;
                
                /*
                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 );
                                
                        }
                        Collections.sort( stations.entries,nameComparator );
                        return stations;
                        

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

        @Deprecated
        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 boolean hasDisabledStation(final String name) throws SQLException {
                String SQL = "Select count(*) as antal from trainstations where name = '" + name + "'  and enabled=false " ;

                Connection conn = DBConnection.getConnection();
                Statement stmt = conn.createStatement();
                ResultSet rs = stmt.executeQuery( SQL );
                
                rs.next();

                int antal = rs.getInt(1);
                
                rs.close();
                stmt.close(); 
                conn.close();
                
                return (antal > 0);
        }
        
        
        @Deprecated
        public int getIdByName(final 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 ";

                class NameSetter implements StatementParamSetter {
                        @Override
                        public void setParams(PreparedStatement stmt) throws SQLException {
                                stmt.setString(1, name );
                        }                       
                }
                
                StationBean stations = fetchStations(SQL, new NameSetter() );
                
                if (stations.entries.size() == 1) {
                        return stations.entries.get(0).getId();
                } else {
                        return -1;
                }
        }
}
1	package dk.thoerup.traininfoservice.db;
2
3	import java.sql.Array;
4	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	import java.util.Collections;
10	import java.util.Comparator;
11	import java.util.logging.Logger;
12
13	import dk.thoerup.android.traininfo.common.StationBean;
14	import dk.thoerup.android.traininfo.common.StationEntry;
15
16	public class StationDAO {
17
18	private interface StatementParamSetter {
19	public void setParams(PreparedStatement stmt) throws SQLException ;
20	}
21	private class NullSetter implements StatementParamSetter {
22	@Override
23	public void setParams(PreparedStatement stmt) throws SQLException {}
24	}
25
26	public static class NostationException extends Exception {
27	private static final long serialVersionUID = 1L;
28	}
29
30	final static int LOCATION_LIMIT = 8;
31	static final Logger logger = Logger.getLogger(StationDAO.class.getName());
32
33
34	private StationEntry convertSingleRow(ResultSet res) throws SQLException {
35	StationEntry station = new StationEntry();
36
37	station.setId( res.getInt(1) );
38	station.setName( res.getString(2) );
39	station.setLatitude( res.getDouble(3) );
40	station.setLongitude( res.getDouble(4) );
41	station.setRegional( res.getString(5) );
42	station.setStrain( res.getString(6) );
43	station.setMetro( res.getString(7) );
44	station.setAddress( res.getString(8) );
45	station.setCalcdist( (int)res.getDouble(9) );
46
47	station.setIsRegional( station.getRegional() != null );
48	station.setIsStrain( station.getStrain() != null );
49	station.setIsMetro( station.getMetro() != null );
50
51	Array aliases = res.getArray( 10);
52	if (aliases != null) {
53	station.setAliases( (String[]) aliases.getArray() );
54	} else {
55	String[] emptyArray = {};
56	station.setAliases( emptyArray );
57	}
58
59	return station;
60	}
61
62	private StationBean convertResultset(ResultSet res) throws SQLException {
63	StationBean stations = new StationBean();
64	while (res.next()) {
65	stations.entries.add( convertSingleRow(res) );
66	}
67	return stations;
68
69	}
70
71	private StationBean fetchStations(String SQL, StatementParamSetter setter) throws SQLException {
72	StationBean stations;
73	Connection conn = null;
74	PreparedStatement stmt = null;
75	ResultSet res = null;
76	try {
77	conn = DBConnection.getConnection();
78	stmt = conn.prepareStatement(SQL);
79
80	setter.setParams(stmt);
81
82	res = stmt.executeQuery();
83	stations = convertResultset(res);
84
85	} finally {
86	if (res != null)
87	res.close();
88	if (stmt != null)
89	stmt.close();
90	if (conn!= null)
91	conn.close();
92	}
93	return stations;
94
95	}
96
97	public StationEntry getById(int id) throws SQLException,NostationException {
98	String SQL = "SELECT id,name,latitude,longitude,stationcode_fjrn,stationcode_stog,stationcode_metro,address,0.0,aliases " +
99	"FROM trainstations WHERE id=" + id + " AND enabled=true";
100
101	StationBean stations = fetchStations(SQL, new NullSetter() );
102
103	if (stations.entries.size() > 0 ) {
104	return stations.entries.get(0);
105	} else {
106	throw new NostationException();
107	}
108	}
109
110
111
112	/*
113	* 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) )
114	* create function rlike(text,text) returns bool as
115	* 'select $2 ilike $1' language sql strict immutable;
116	* create operator ~~~ (procedure = rlike, leftarg = text, rightarg = text, commutator = ~~);
117	*/
118	public StationBean getByNameNormal(final String name) throws SQLException {
119	String SQL = "SELECT id,name,latitude,longitude,stationcode_fjrn,stationcode_stog, stationcode_metro, address, 0.0,aliases " +
120	"FROM trainstations " +
121	"WHERE (name ILIKE ? OR ? ~~~ ANY(aliases)) AND enabled = true " +
122	"ORDER BY name ";
123
124	class NameSetter implements StatementParamSetter {
125	@Override
126	public void setParams(PreparedStatement stmt) throws SQLException {
127	stmt.setString(1, name + "%");
128	stmt.setString(2, name + "%");
129	}
130	}
131
132	return fetchStations(SQL, new NameSetter() );
133	}
134
135
136	public StationBean getByNameFuzzy(final String name) throws SQLException {
137	String SQL = "SELECT * FROM (" +
138	" SELECT id,name,latitude,longitude,stationcode_fjrn,stationcode_stog, stationcode_metro, address, 0.0, aliases, " +
139	" levenshtein(lower(name),lower(?) ) as leven " +
140	" FROM trainstations " +
141	" WHERE enabled = true ) as lev2 " +
142	"WHERE (leven <= 3) " +
143	"ORDER BY leven " +
144	"LIMIT 1";
145
146	class NameSetter implements StatementParamSetter {
147	@Override
148	public void setParams(PreparedStatement stmt) throws SQLException {
149	stmt.setString(1, name );
150	}
151	}
152
153	StationBean stations = fetchStations(SQL, new NameSetter() );
154	stations.fuzzystrmatch = true;
155	return stations;
156	}
157
158	private String removeSuffix(String str, String suffix) {
159	if (str.endsWith(suffix)) {
160	return str.substring(0, str.length() - suffix.length() );
161	} else {
162	return str;
163	}
164	}
165
166	public StationBean getByName(String name) throws SQLException {
167	name = removeSuffix(name, " st.");
168	name = removeSuffix(name, " st");
169	name = removeSuffix(name, " station");
170
171	StationBean stations = getByNameNormal(name);
172
173	if (stations.entries.size() == 0) {
174	stations = getByNameFuzzy(name);
175
176	logger.info("getByName failover: " + name + "(" + (stations.entries.size() >0) + ")" );
177	}
178	return stations;
179	}
180
181
182
183	//Latitude (horizonal), longitude(vertical) so
184	// 1 degree latitude is ~ 111320 meters, since the distance between the horizonal lines is always the same
185	// 1 degree longitude is ~111320 meters at equator but gets shorter as we get closer to the poles.
186	// so 1 degree longitude is 64.5 km at denmarks southern point (gedser=54.55,11.95)
187	// and is 59.4km at northern point (skagen = 57.75,10.65)
188	// The "hack" with max 0.4 degrees latitude and 0.75 degrees longitude is only valid since we only service danish trains,
189	// in denmark 0.4dg latitude ~ 44km, 0.75dg longitude ~ 47km
190
191	// the ultra fast method (and only slightly inaccurate as long as we only cover a limited geographically area)
192	// is using an aproximation of the length of 1 latitude degree and 1 longitude degree and just use pythagoras to
193	// calculate the distance:
194	// sqrt( power(abs(latitude-?)111320, 2) + power(abs(longitude-?)63000,2) )::int as calcdist
195
196	public StationBean getByLocationWorker(final double latitude, final double longitude, final boolean geolimit) throws SQLException {
197
198	String limitExpression = (geolimit == true) ? "AND abs(latitude-?)<0.4 AND abs(longitude-?)<0.75 " : "";
199
200	String SQL = "SELECT id,name,latitude,longitude,stationcode_fjrn,stationcode_stog, stationcode_metro, address, " +
201	"earth_distance( earth_coord, ll_to_earth(?,?))::int AS calcdist,aliases " +
202	"FROM trainstations " +
203	"WHERE enabled = true " + limitExpression +
204	"ORDER BY calcdist ASC " +
205	"LIMIT " + LOCATION_LIMIT;
206
207
208	class LatlongSetter implements StatementParamSetter {
209	@Override
210	public void setParams(PreparedStatement stmt) throws SQLException {
211	stmt.setDouble(1, latitude);
212	stmt.setDouble(2, longitude);
213	if (geolimit == true) {
214	stmt.setDouble(3, latitude);
215	stmt.setDouble(4, longitude);
216	}
217	}
218	}
219
220	return fetchStations(SQL, new LatlongSetter() );
221	}
222
223	public StationBean getByLocation(double latitude, double longitude) throws SQLException {
224	StationBean result = getByLocationWorker(latitude, longitude, true);
225
226	if (result.entries.size() < LOCATION_LIMIT) { //failover
227	logger.info("getByLocation failover: " +latitude + "," + longitude);
228
229	result = getByLocationWorker(latitude, longitude, false);
230	}
231
232	return result;
233	}
234
235
236
237	public StationBean getByList(String list) throws SQLException {
238	String SQL = "SELECT id,name,latitude,longitude,stationcode_fjrn,stationcode_stog,stationcode_metro, address,0.0,aliases " +
239	"FROM trainstations " +
240	"WHERE id IN " + list + " AND enabled = true " +
241	"ORDER BY name ";
242
243	return fetchStations(SQL, new NullSetter() );
244	}
245
246
247
248	public StationEntry getSimpleByName(final String name) throws SQLException {
249	String SQL = "SELECT id,name,latitude,longitude,stationcode_fjrn,stationcode_stog, stationcode_metro, address, 0.0,aliases " +
250	"FROM trainstations " +
251	"WHERE name = ? AND enabled = true " +
252	"LIMIT 1 ";
253
254	class NameSetter implements StatementParamSetter {
255	@Override
256	public void setParams(PreparedStatement stmt) throws SQLException {
257	stmt.setString(1, name );
258	}
259	}
260
261	StationBean stations = fetchStations(SQL, new NameSetter() );
262
263	if (stations.entries.size() == 1) {
264	return stations.entries.get(0);
265	} else {
266	return null;
267	}
268	}
269
270	Comparator<StationEntry> nameComparator = new Comparator<StationEntry>() {
271	@Override
272	public int compare(StationEntry arg0, StationEntry arg1) {
273	return arg0.getName().compareTo( arg1.getName() );
274	}
275	};
276
277	//used to create full dump in order to populate Google Appengine DB
278	//after 1.1.0 also used to populate client-side station list
279	public StationBean dumpAll() throws SQLException {
280
281	String SQL = "SELECT id,name,latitude,longitude,stationcode_fjrn,stationcode_stog,stationcode_metro,address,0.0,aliases " +
282	"FROM trainstations WHERE enabled = true";
283
284
285	StationBean stations = fetchStations(SQL, new NullSetter() );
286	Collections.sort( stations.entries,nameComparator );
287
288	return stations;
289
290	/*
291	Connection conn = null;
292	Statement stmt = null;
293	ResultSet res = null;
294
295
296	try {
297	conn = DBConnection.getConnection();
298
299	stmt = conn.createStatement();
300	res = stmt.executeQuery(SQL);
301
302	// Does mostly the same as convertResultset()
303	StationBean stations = new StationBean();
304	while (res.next()) {
305	StationEntry entry = convertSingleRow(res);
306
307	Array arr = res.getArray(10);
308	if (arr != null) {
309	String[] aliases = (String[]) arr.getArray();
310	entry.setAliases(aliases);
311	}
312
313	stations.entries.add( entry );
314
315	}
316	Collections.sort( stations.entries,nameComparator );
317	return stations;
318
319
320	} finally {
321	if (res != null)
322	res.close();
323	if (stmt != null)
324	stmt.close();
325	if (conn != null)
326	conn.close();
327	}*/
328
329	}
330
331	@Deprecated
332	public static String getStationName(int stationID) {
333	String station = "";
334
335	Connection conn = null;
336	try {
337	conn = DBConnection.getConnection();
338	Statement stmt = conn.createStatement();
339	ResultSet rs = stmt.executeQuery("SELECT name FROM trainstations WHERE id=" + stationID);
340	if (rs.next()) {
341	station = rs.getString(1);
342	}
343
344	} catch (Exception e) {
345	} finally {
346	try {
347	if (conn != null && !conn.isClosed())
348	conn.close();
349	} catch (Exception e) {}
350	}
351
352	return station;
353	}
354
355	public boolean hasDisabledStation(final String name) throws SQLException {
356	String SQL = "Select count(*) as antal from trainstations where name = '" + name + "' and enabled=false " ;
357
358	Connection conn = DBConnection.getConnection();
359	Statement stmt = conn.createStatement();
360	ResultSet rs = stmt.executeQuery( SQL );
361
362	rs.next();
363
364	int antal = rs.getInt(1);
365
366	rs.close();
367	stmt.close();
368	conn.close();
369
370	return (antal > 0);
371	}
372
373
374	@Deprecated
375	public int getIdByName(final String name) throws SQLException {
376	String SQL = "SELECT id,name,latitude,longitude,stationcode_fjrn,stationcode_stog, stationcode_metro, address, 0.0 " +
377	"FROM trainstations " +
378	"WHERE name = ? AND enabled = true " +
379	"LIMIT 1 ";
380
381	class NameSetter implements StatementParamSetter {
382	@Override
383	public void setParams(PreparedStatement stmt) throws SQLException {
384	stmt.setString(1, name );
385	}
386	}
387
388	StationBean stations = fetchStations(SQL, new NameSetter() );
389
390	if (stations.entries.size() == 1) {
391	return stations.entries.get(0).getId();
392	} else {
393	return -1;
394	}
395	}
396	}