1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
| import java.net.Socket;
import java.net.ServerSocket;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;
public class Server extends Thread {
private Connection connection;
private Socket socket;
public Server(Socket sock, Connection conn) {
socket = sock;
connection = conn;
}
public void run() {
java.io.DataInputStream input;
java.io.PrintStream output;
try {
String tmp;
java.util.StringTokenizer tokens;
java.util.Vector albums = new java.util.Vector();
boolean transacting = true;
Statement statement;
ResultSet result_set;
input = new java.io.DataInputStream(socket.getInputStream());
output = new java.io.PrintStream(socket.getOutputStream());
statement = connection.createStatement();
result_set = statement.executeQuery("SELECT album_id, artist, title, "+
&quo t;price " +
& nbsp;"FROM album ");
while( result_set.next() ) {
String id, artist, title, price;
id = result_set.getString(1);
artist = result_set.getString(2);
title = result_set.getString(3);
price = result_set.getString(4);
albums.addElement(id + ":" + artist + ":" + title + ":" + price);
}
output.println(albums.size());
for(int i = 0; i<albums.size(); i++)
output.println((String)albums.elementAt(i));
while( transacting ) {
tmp = input.readLine();
tokens = new java.util.StringTokenizer(tmp);
tmp = tokens.nextToken();
if( tmp.equals("exit") ) {
transacting = false;
}
else if( tmp.equals("purchase") ) {
String credit_card;
String id;
if( tokens.countTokens() != 2 ) {
output.println("error Invalid command");
socket.close();
return;
}
id = tokens.nextToken();
credit_card = tokens.nextToken();
statement = connection.createStatement();
statement.executeUpdate("INSERT INTO purchase (" +
"credit_card, album) " +
"VALUES('" + credit_card + "', '" +
id + "')");
output.println("ok");
}
}
}
catch( Exception e );
finally {
try {
socket.close();
}
catch( java.io.IOException e );
}
}
static public void main(String args[]) {
ServerSocket port_socket;
String driver;
String url;
int port;
if( args.length != 3 ) {
System.err.println("Syntax: java Server <JDBC driver> <JDBC URL> " +
"<port>");
System.exit(-1);
return;
}
driver = args[0];
url = args[1];
try {
port = Integer.parseInt(args[2]);
}
catch( NumberFormatException e ) {
System.err.println("Invalid port number: " + args[2]);
System.exit(-1);
return;
}
try {
port_socket = new ServerSocket(port);
}
catch( java.io.IOException e ) {
System.err.println("Failed to listen to port: " + e.getMessage());
System.exit(-1);
return;
}
while( true ) {
try {
Connection conn;
Server server;
Socket client_sock = port_socket.accept();
conn = java.sql.DriverManager.getConnection(url, "user", "pass");
server = new Server(client_sock, conn);
server.start();
}
catch( java.io.IOException e ) {
System.err.println("Connection failed.");
}
catch( java.sql.SQLException e ) {
System.err.println("Failed to connect to database.");
}
}
}
} |
