26 |
super(); |
super(); |
27 |
// TODO Auto-generated constructor stub |
// TODO Auto-generated constructor stub |
28 |
} |
} |
29 |
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30 |
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31 |
protected String getStations(Connection conn, double latitude, double longitude) throws SQLException { |
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32 |
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protected String getStations(Connection conn, double latitude, double longitude, String name) throws SQLException { |
33 |
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String SQL = ""; |
34 |
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35 |
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if (latitude >= 0.0 && longitude >= 0.0) |
36 |
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{ |
37 |
//inner select is workaround from not being able to use a calculated column directly in where clause |
//inner select is workaround from not being able to use a calculated column directly in where clause |
38 |
final String SQL = "SELECT * FROM ( "+ |
SQL = "SELECT * FROM ( "+ |
39 |
" SELECT name,latitude,longitude,stationcode, " + |
" SELECT id,name,latitude,longitude,stationcode_fjrn,stationcode_stog, " + |
40 |
" earth_distance( ll_to_earth(latitude,longitude), ll_to_earth(?,?))::int AS calcdist " + |
" earth_distance( ll_to_earth(latitude,longitude), ll_to_earth(?,?))::int AS calcdist " + |
41 |
" FROM trainstations " + |
" FROM trainstations " + |
42 |
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" WHERE latitude IS NOT NULL AND longitude IS NOT NULL " + |
43 |
" ) AS trainstations2 " + |
" ) AS trainstations2 " + |
44 |
"ORDER BY calcdist ASC " + |
"ORDER BY calcdist ASC " + |
45 |
"LIMIT 4 "; |
"LIMIT 4 "; |
46 |
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} else if (name != null) { |
47 |
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SQL = "SELECT id,name,latitude,longitude,stationcode_fjrn,stationcode_stog,0.0 " + |
48 |
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"FROM trainstations " + |
49 |
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"WHERE name ILIKE ? AND latitude IS NOT NULL AND longitude IS NOT NULL " + |
50 |
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"ORDER BY name "; |
51 |
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} else throw new SQLException("not enough parameters"); |
52 |
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System.out.println(SQL); |
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53 |
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54 |
PreparedStatement stmt = null; |
PreparedStatement stmt = null; |
55 |
ResultSet res = null; |
ResultSet res = null; |
61 |
try |
try |
62 |
{ |
{ |
63 |
stmt = conn.prepareStatement(SQL); |
stmt = conn.prepareStatement(SQL); |
64 |
stmt.setDouble(1, latitude); |
if (latitude >= 0 && longitude >= 0) { |
65 |
stmt.setDouble(2, longitude); |
stmt.setDouble(1, latitude); |
66 |
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stmt.setDouble(2, longitude); |
67 |
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} |
68 |
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if (name != null) { |
69 |
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stmt.setString(1, "%" + name + "%"); |
70 |
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} |
71 |
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72 |
res = stmt.executeQuery(); |
res = stmt.executeQuery(); |
73 |
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74 |
while (res.next()) { |
while (res.next()) { |
75 |
buff.append("<station>\n"); |
buff.append("<station>\n"); |
76 |
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77 |
buff.append("<name>").append( res.getString(1) ) .append("</name>\n"); |
buff.append("<id>").append( res.getInt(1) ).append("</id>\n"); |
78 |
buff.append("<latitude>").append( res.getDouble(2) ) .append("</latitude>\n"); |
buff.append("<name>").append( res.getString(2) ) .append("</name>\n"); |
79 |
buff.append("<longitude>").append( res.getDouble(3) ) .append("</longitude>\n"); |
buff.append("<latitude>").append( res.getDouble(3) ) .append("</latitude>\n"); |
80 |
buff.append("<stationcode>").append( res.getString(4) ) .append("</stationcode>\n"); |
buff.append("<longitude>").append( res.getDouble(4) ) .append("</longitude>\n"); |
81 |
buff.append("<calcdist>").append( res.getInt(5) ) .append("</calcdist>\n"); |
res.getString(5); |
82 |
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buff.append("<fjerntog>").append( !res.wasNull() ) .append("</fjerntog>\n"); |
83 |
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res.getString(6); |
84 |
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buff.append("<stog>").append( !res.wasNull() ) .append("</stog>\n"); |
85 |
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buff.append("<calcdist>").append( res.getInt(7) ) .append("</calcdist>\n"); |
86 |
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|
87 |
buff.append("</station>\n"); |
buff.append("</station>\n"); |
88 |
} |
} |
98 |
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99 |
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { |
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { |
100 |
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101 |
double latitude = Double.parseDouble( request.getParameter("latitude") ); |
double latitude = -1.0; |
102 |
double longitude = Double.parseDouble( request.getParameter("longitude") ); |
if (request.getParameter("latitude") != null) |
103 |
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latitude = Double.parseDouble( request.getParameter("latitude") ); |
104 |
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|
105 |
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double longitude = -1.0; |
106 |
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if (request.getParameter("latitude") != null) |
107 |
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longitude = Double.parseDouble( request.getParameter("longitude") ); |
108 |
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|
109 |
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String name = request.getParameter("name"); |
110 |
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|
111 |
Connection conn = null; |
Connection conn = null; |
112 |
try { |
try { |
113 |
conn = DBConnection.getConnection(); |
conn = DBConnection.getConnection(); |
114 |
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|
115 |
String xml = getStations(conn, latitude, longitude); |
String xml = getStations(conn, latitude, longitude, name); |
116 |
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|
117 |
response.setContentType("text/xml"); |
response.setContentType("text/xml"); |
118 |
response.getWriter().print(xml); |
response.getWriter().print(xml); |