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上传时间: 2011-04-05
详细说明： package user; import java.sql.*; import java.util.*; import java.util.Date; import java.sql.PreparedStatement; import com.ConnDB; import java.sql.*; import java.util.*; import com.ConnDB; public class UserDB extends ConnDB{ private ArrayList user; public UserDB () throws Exception { } public boolean userExist(String username){ boolean occupied=true; try { ConnDB.initialize(); // create database connection PreparedStatement preparedStatement = conn .prepareStatement ( "select userid from Buser where username=?"); preparedStatement.setString (1, username); ResultSet resultSet = preparedStatement.executeQuery (); if(!resultSet.next()) occupied=false; preparedStatement.close (); ConnDB.terminate(); } catch(SQLException e){ e.printStackTrace(); ConnDB.terminate(); } return occupied; } public boolean isValidUser (String username, String password) { boolean isValid=false; try { ConnDB.initialize(); // create database connection PreparedStatement preparedStatement = conn.prepareStatement ( "SELECT username, password FROM Buser WHERE username=? and password=?"); preparedStatement.setString (1, username); preparedStatement.setString (2, password); ResultSet resultSet = preparedStatement.executeQuery (); if (resultSet.next ()) { isValid=true; preparedStatement.close (); ConnDB.terminate(); } else { preparedStatement.close (); ConnDB.terminate(); //return isValid; } } catch (SQLException e) { ConnDB.terminate(); //return isValid; } return isValid; } public boolean find(String key) { boolean gotIt=false; try { ConnDB.initialize(); // create database connection PreparedStatement preparedStatement = conn.prepareStatement ( "SELECT username, password FROM Buser WHERE username = ?"); preparedStatement.setString (1, key); ResultSet resultSet = preparedStatement.executeQuery (); if (resultSet.next ()) { gotIt=true; preparedStatement.close (); ConnDB.terminate(); } else { preparedStatement.close (); ConnDB.terminate(); //return isValid; } } catch (SQLException e) { ConnDB.terminate(); //return gotIt; } return gotIt; } public User getUser (int id) { try { ConnDB.initialize(); // create database connection PreparedStatement preparedStatement = conn.prepareStatement ( "SELECT userid, username, rname, password, email, address, postdate, tel " + "FROM Buser WHERE userId = ?"); preparedStatement.setInt (1, id); ResultSet resultSet = preparedStatement.executeQuery (); if (resultSet.next ()) { User users = new User ( resultSet.getInt (1), resultSet.getString (2), resultSet.getString (3), resultSet.getString (4), resultSet.getString (5), resultSet.getString (6), resultSet.getString (7), resultSet.getString (8) ); preparedStatement.close (); ConnDB.terminate(); return users; } else { preparedStatement.close (); ConnDB.terminate(); return null; } } catch (SQLException e) { ConnDB.terminate(); return null; } } public User getUser (String username) { try { ConnDB.initialize(); // create database connection PreparedStatement preparedStatement = conn.prepareStatement ( "SELECT userid, username, rname, password, email, address, postdate, tel " + "FROM Buser WHERE username = ?"); preparedStatement.setString (1, username); ResultSet resultSet = preparedStatement.executeQuery (); if (resultSet.next ()) { User users = new User ( resultSet.getInt (1), resultSet.getString (2), resultSet.getString (3), resultSet.getString (4), resultSet.getString (5), resultSet.getString (6), resultSet.getString (7), resultSet.getString (8) ); preparedStatement.close (); ConnDB.terminate(); return users; } else { preparedStatement.close (); ConnDB.terminate(); return null; } } catch (SQLException e) { ConnDB.terminate(); return null; } } public int addUsers (User users) { System.out.println("**"); int rowsAffected = 0; try { ConnDB.initialize(); // create database connection PreparedStatement preparedStatement = conn.prepareStatement ( "INSERT INTO Buser (username, rname, password, email, address, postdate, tel) " + "VALUES (?, ?, ?, ?, ?, ?, ?)"); preparedStatement.setString (1, users.getUsername ()); preparedStatement.setString (2, users.getRname ()); preparedStatement.setString (3, users.getPassword()); preparedStatement.setString (4, users.getEmail()); preparedStatement.setString (5, users.getAddress()); preparedStatement.setString (6, users.getPostdate()); preparedStatement.setString (7, users.getTel()); //判断是否重复添加 if(find(users.getUsername ())){ rowsAffected =2; System.out.println("exist username"); } else{ rowsAffected = preparedStatement.executeUpdate (); System.out.println(rowsAffected + "add"); } preparedStatement.close (); ConnDB.terminate(); } catch (SQLException e) { ConnDB.terminate(); return 0; } return rowsAffected; } public int deleteUser (int id) { int rowsAffected = 0; try { ConnDB.initialize(); // create database connection PreparedStatement preparedStatement = conn.prepareStatement ("DELETE FROM Buser WHERE userid = ?"); preparedStatement.setInt (1, id); rowsAffected = preparedStatement.executeUpdate (); preparedStatement.close (); ConnDB.terminate(); } catch (SQLException e) { ConnDB.terminate(); return 0; } return rowsAffected; } public int modifyUser (User users) { int rowsAffected = 0; try { ConnDB.initialize(); // create database connection PreparedStatement preparedStatement = conn.prepareStatement ( "UPDATE Buser SET username=?, rname=?, password=?, email=?, address=?, postdate=?, tel=? " + "WHERE userid =?"); preparedStatement.setString (1, users.getUsername ()); preparedStatement.setString (2, users.getRname ()); preparedStatement.setString (3, users.getPassword()); preparedStatement.setString (4, users.getEmail()); preparedStatement.setString (5, users.getAddress()); preparedStatement.setString (6, users.getPostdate()); preparedStatement.setString (7, users.getTel()); preparedStatement.setInt (8, users.getId ()); rowsAffected = preparedStatement.executeUpdate (); preparedStatement.close (); ConnDB.terminate(); } catch (SQLException e) { ConnDB.terminate(); return 0; } return rowsAffected; } public Collection getUser () { user = new ArrayList (); try { ConnDB.initialize(); // create database connection PreparedStatement preparedStatement = conn.prepareStatement ( "SELECT userid, username, rname, password, email, address, postdate, tel " + "FROM Buser"); ResultSet resultSet = preparedStatement.executeQuery (); while (resultSet.next ()) { User users = new User ( resultSet.getInt (1), resultSet.getString (2), resultSet.getString (3), resultSet.getString (4), resultSet.getString (5), resultSet.getString (6), resultSet.getString (7), resultSet.getString (8) ); user.add(users); } preparedStatement.close (); } catch (SQLException e) { return null; } ConnDB.terminate(); //Collections.sort(user); return user; } public boolean isModify(String key,int id) { boolean modifyIt=false; try { ConnDB.initialize(); // create database connection PreparedStatement preparedStatement = conn.prepareStatement ( "SELECT userid FROM Buser WHERE username = ? and userd <> ?"); preparedStatement.setString (1, key); preparedStatement.setInt (2, id); ResultSet resultSet = preparedStatement.executeQuery (); if (resultSet.next ()) { modifyIt=true; preparedStatement.close (); ConnDB.terminate(); } else { preparedStatement.close (); ConnDB.terminate(); //return isValid; } } catch (SQLException e) { ConnDB.terminate(); //return gotIt; } return modifyIt; } } ...展开收缩
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