SQL Batch
/*
Database Programming with JDBC and Java, Second Edition
By George Reese
ISBN: 1-56592-616-1
Publisher: O'Reilly
*/
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.ArrayList;
import java.util.Iterator;
/**
* Example 4.1.
*/
public class Batch {
static public void main(String[] args) {
Connection conn = null;
try {
ArrayList breakable = new ArrayList();
PreparedStatement stmt;
Iterator users;
ResultSet rs;
Class.forName(args[0]).newInstance();
conn = DriverManager.getConnection(args[1], args[2], args[3]);
stmt = conn.prepareStatement("SELECT user_id, password "
+ "FROM user");
rs = stmt.executeQuery();
while (rs.next()) {
String uid = rs.getString(1);
String pw = rs.getString(2);
// Assume PasswordCracker is some class that provides
// a single static method called crack() that attempts
// to run password cracking routines on the password
// if( PasswordCracker.crack(uid, pw) ) {
// breakable.add(uid);
// }
}
stmt.close();
if (breakable.size() < 1) {
return;
}
stmt = conn.prepareStatement("UPDATE user "
+ "SET bad_password = 'Y' " + "WHERE uid = ?");
users = breakable.iterator();
while (users.hasNext()) {
String uid = (String) users.next();
stmt.setString(1, uid);
stmt.addBatch();
}
stmt.executeBatch();
} catch (Exception e) {
e.printStackTrace();
} finally {
if (conn != null) {
try {
conn.close();
} catch (Exception e) {
}
}
}
}
}
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