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 dk.thoerup.traininfoservice.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;
        }

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