java连接sql2000，返回数据库连接，以及PreparedStatement使用

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

public class DBConnection {
	public static Connection getConnection()throws SQLException,IllegalAccessException{
		Connection conn= null;
		try{
		Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver");
		String url ="jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=test";
		String user = "sa";
		String password = "";
		conn = DriverManager.getConnection(url, user, password);
		
		} catch( ClassNotFoundException e){System.out.println(e.getMessage());}
		catch (SQLException ex){
		System.out.println("SQLException: " + ex.getMessage());
		System.out.println("SQLState: " + ex.getSQLState());
		
		}
		return conn;
	}

}

//////////////////

public void insert(part newpart) throws Exception{
		Connection conn = null;
		PreparedStatement ps = null;
		String sql = "insert into part(pno,name)" +
				" values(?,?)";
		
		try{
			conn = DBConnection.getConnection();
			ps = conn.prepareStatement(sql);
			ps.setInt(1,newpart.getPno());
			ps.setString(2,newpart.getPname());
			ps.executeUpdate();
		}catch(SQLException sqle){
			throw new Exception("insert data exception:" + sqle.getMessage());
		}finally{
			try{
				if(ps != null){
					ps.close();
				}
			}catch (Exception e){
				throw new Exception("ps close exception:" + e.getMessage());
			}
		}
		try{
			if(conn != null){
				conn.close();
			}
		}catch (Exception e){
			throw new Exception("connection close exception:" + e.getMessage());
		}
	}

public ArrayList<part> select(String sql) throws Exception{
		ArrayList result = new ArrayList<part>();
		Connection conn = null;
		Statement stmt = null;
		ResultSet rs = null;
		System.out.println("enter into select");
		try{
			conn = DBConnection.getConnection();
			stmt = conn.createStatement();
			rs = stmt.executeQuery(sql);
			while(rs.next()){
				part newpart = new part();
				newpart.setPno(rs.getInt("pno"));
			newpart.setPname(rs.getString("name"));
			result.add(newpart);
			System.out.println("added once");
		}
		} catch(SQLException sqle){
			throw new SQLException("select data exception:"+sqle.getMessage());
		}finally{
		
			try{
				if(rs != null){
					rs.close();
				}
			}catch(Exception e){
				throw new Exception("statement close exception"+e.getMessage());
			}
			try{
				if(stmt != null){
					stmt.close();
				}
			}catch(Exception e){
				throw new Exception("statement close exception"+e.getMessage());
			}
			try{
				if(conn != null){
					conn.close();
				}
			}catch(Exception e){
				throw new Exception("statement close exception"+e.getMessage());
			}
		}
		return result;
	}