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.ArrayList;
import java.util.List;

import com.sun.istack.logging.Logger;

public class StationDAO {
        final static int LOCATION_LIMIT = 5;
        static final Logger logger = Logger.getLogger(StationDAO.class);
        
        private StationBean convertSingleRow(ResultSet res) throws SQLException {
                StationBean station = new StationBean();

                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) );

                return station;
        }

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

        }


        public StationBean 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;
                StationBean 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 List<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 ";


                List<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 0.5 degrees latitude and 0.9 degrees longitude is only valid since we only service danish trains,
        // in denmark 0.5dg latitude ~ 55km, 0.9dg longitude ~ 57km

        // 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 List<StationBean> getByLocationWorker(double latitude, double longitude, boolean geolimit) throws SQLException {
                
                String limitExpression = geolimit == true ? "AND abs(latitude-?)<0.5 AND abs(longitude-?)<0.9 " : "";
                
                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;


                List<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 List<StationBean> getByLocation(double latitude, double longitude) throws SQLException {
                List<StationBean> result = getByLocationWorker(latitude, longitude, true);
                
                if (result.size() < LOCATION_LIMIT) { //failover
                        logger.info("getByLocation failover: " +latitude + "," + longitude);
                        
                        result = getByLocationWorker(latitude, longitude, false);
                }
                
                return result;
        }
        
        
        public List<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;
                List<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 ";

                List<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.size() == 1) {
                        return result.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			import java.util.ArrayList;
9			import java.util.List;
10
11	torben	894	import com.sun.istack.logging.Logger;
12
13	torben	588	public class StationDAO {
14	torben	841	final static int LOCATION_LIMIT = 5;
15	torben	894	static final Logger logger = Logger.getLogger(StationDAO.class);
16	torben	841
17	torben	588	private StationBean convertSingleRow(ResultSet res) throws SQLException {
18			StationBean station = new StationBean();
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	836
30	torben	588	return station;
31			}
32	torben	836
33	torben	588	private List<StationBean> convertResultset(ResultSet res) throws SQLException {
34			List<StationBean> stations = new ArrayList<StationBean>();
35			while (res.next()) {
36			stations.add( convertSingleRow(res) );
37			}
38			return stations;
39	torben	836
40	torben	588	}
41	torben	836
42
43	torben	588	public StationBean getById(int id) throws SQLException {
44			String SQL = "SELECT id,name,latitude,longitude,stationcode_fjrn,stationcode_stog,stationcode_metro,address,0.0 " +
45	torben	836	"FROM trainstations WHERE id=" + id + " AND enabled=true";
46
47	torben	588	Connection conn = null;
48	torben	589	Statement stmt = null;
49			ResultSet res = null;
50	torben	588	StationBean result;
51	torben	836
52	torben	588	try {
53			conn = DBConnection.getConnection();
54	torben	836
55	torben	589	stmt = conn.createStatement();
56			res = stmt.executeQuery(SQL);
57	torben	588	res.next();
58			result = convertSingleRow(res);
59			} finally {
60	torben	589	if (res != null)
61			res.close();
62			if (stmt != null)
63			stmt.close();
64	torben	588	if (conn != null)
65			conn.close();
66			}
67	torben	836
68	torben	588	return result;
69			}
70	torben	836
71	torben	714	/*
72			* 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) )
73			* create function rlike(text,text) returns bool as
74			* 'select $2 ilike $1' language sql strict immutable;
75	torben	836	* create operator ~~~ (procedure = rlike, leftarg = text, rightarg = text, commutator = ~~);
76	torben	714	*/
77	torben	588	public List<StationBean> getByName(String name) throws SQLException {
78			String SQL = "SELECT id,name,latitude,longitude,stationcode_fjrn,stationcode_stog, stationcode_metro, address, 0.0 " +
79			"FROM trainstations " +
80	torben	714	"WHERE (name ILIKE ? OR ? ~~~ ANY(aliases)) AND enabled = true " +
81	torben	588	"ORDER BY name ";
82
83	torben	836
84	torben	588	List<StationBean> result;
85			Connection conn = null;
86	torben	589	PreparedStatement stmt = null;
87			ResultSet res = null;
88	torben	588	try {
89			conn = DBConnection.getConnection();
90	torben	589	stmt = conn.prepareStatement(SQL);
91	torben	836
92	torben	588	stmt.setString(1, name + "%");
93	torben	714	stmt.setString(2, name + "%");
94	torben	836
95	torben	589	res = stmt.executeQuery();
96			result = convertResultset(res);
97	torben	836
98	torben	588	} finally {
99	torben	589	if (res != null)
100			res.close();
101			if (stmt != null)
102			stmt.close();
103			if (conn!= null)
104	torben	588	conn.close();
105			}
106			return result;
107			}
108	torben	836
109	torben	850	//the "hack" with max 0.5 degrees latitude and 0.9 degrees longitude is only valid since we only service danish trains,
110			// in denmark 0.5dg latitude ~ 55km, 0.9dg longitude ~ 57km
111	torben	836
112	torben	741	// the ultra fast method (and only slightly inaccurate as long as we only cover a limited geographically area)
113			// is using an aproximation of the length of 1 latitude degree and 1 longitude degree and just use pythagoras to
114			// calculate the distance:
115	torben	836	// sqrt( power(abs(latitude-?)111320, 2) + power(abs(longitude-?)63000,2) )::int as calcdist
116
117	torben	841	public List<StationBean> getByLocationWorker(double latitude, double longitude, boolean geolimit) throws SQLException {
118
119	torben	850	String limitExpression = geolimit == true ? "AND abs(latitude-?)<0.5 AND abs(longitude-?)<0.9 " : "";
120	torben	841
121			String SQL = "SELECT id,name,latitude,longitude,stationcode_fjrn,stationcode_stog, stationcode_metro, address, " +
122			"earth_distance( earth_coord, ll_to_earth(?,?))::int AS calcdist " +
123			"FROM trainstations " +
124			"WHERE enabled = true " + limitExpression +
125			"ORDER BY calcdist ASC " +
126			"LIMIT " + LOCATION_LIMIT;
127	torben	849
128
129	torben	841
130	torben	588	List<StationBean> result;
131			Connection conn = null;
132	torben	589	PreparedStatement stmt = null;
133			ResultSet res = null;
134	torben	588	try {
135			conn = DBConnection.getConnection();
136	torben	589	stmt = conn.prepareStatement(SQL);
137	torben	588	stmt.setDouble(1, latitude);
138			stmt.setDouble(2, longitude);
139	torben	841	if (geolimit == true) {
140			stmt.setDouble(3, latitude);
141			stmt.setDouble(4, longitude);
142			}
143	torben	589	res = stmt.executeQuery();
144			result = convertResultset(res);
145	torben	849
146	torben	588	} finally {
147	torben	589	if (res != null)
148			res.close();
149			if (stmt != null)
150			stmt.close();
151			if (conn!= null)
152	torben	588	conn.close();
153			}
154			return result;
155			}
156	torben	841
157			public List<StationBean> getByLocation(double latitude, double longitude) throws SQLException {
158			List<StationBean> result = getByLocationWorker(latitude, longitude, true);
159
160			if (result.size() < LOCATION_LIMIT) { //failover
161	torben	894	logger.info("getByLocation failover: " +latitude + "," + longitude);
162
163	torben	841	result = getByLocationWorker(latitude, longitude, false);
164			}
165
166			return result;
167			}
168
169
170	torben	836
171			public List<StationBean> getByList(String list) throws SQLException {
172			String SQL = "SELECT id,name,latitude,longitude,stationcode_fjrn,stationcode_stog,stationcode_metro, address,0.0 " +
173			"FROM trainstations " +
174			"WHERE id IN " + list + " AND enabled = true " +
175			"ORDER BY name ";
176
177			Connection conn = null;
178			Statement stmt = null;
179			ResultSet res = null;
180			List<StationBean> result;
181
182			try {
183			conn = DBConnection.getConnection();
184			stmt = conn.createStatement();
185			res = stmt.executeQuery(SQL);
186			result = convertResultset(res);
187			} finally {
188			if (res != null)
189			res.close();
190			if (stmt != null)
191			stmt.close();
192			if (conn!= null)
193			conn.close();
194			}
195
196			return result;
197
198			}
199			public static String getStationName(int stationID) {
200			String station = "";
201
202			Connection conn = null;
203			try {
204			conn = DBConnection.getConnection();
205			Statement stmt = conn.createStatement();
206			ResultSet rs = stmt.executeQuery("SELECT name FROM trainstations WHERE id=" + stationID);
207			if (rs.next()) {
208			station = rs.getString(1);
209			}
210
211			} catch (Exception e) {
212			} finally {
213	torben	588	try {
214	torben	836	if (conn != null && !conn.isClosed())
215	torben	588	conn.close();
216	torben	836	} catch (Exception e) {}
217			}
218	torben	650
219	torben	836	return station;
220			}
221	torben	650
222	torben	842	public int getIdByName(String name) throws SQLException {
223	torben	836	String SQL = "SELECT id,name,latitude,longitude,stationcode_fjrn,stationcode_stog, stationcode_metro, address, 0.0 " +
224			"FROM trainstations " +
225			"WHERE name = ? AND enabled = true " +
226			"LIMIT 1 ";
227	torben	650
228	torben	836	List<StationBean> result;
229			Connection conn = null;
230			PreparedStatement stmt = null;
231			ResultSet res = null;
232			try {
233			conn = DBConnection.getConnection();
234			stmt = conn.prepareStatement(SQL);
235
236			stmt.setString(1, name );
237
238			res = stmt.executeQuery();
239			result = convertResultset(res);
240
241			} finally {
242			if (res != null)
243			res.close();
244			if (stmt != null)
245			stmt.close();
246			if (conn!= null)
247			conn.close();
248			}
249
250			if (result.size() == 1) {
251			return result.get(0).getId();
252			} else {
253			return -1;
254			}
255			}
256	torben	588	}