JDBC编程

	public static ArrayList newjdbc(String url , String sql)
	{
		Connection conn=null;
		Statement st=null;
		ResultSet rt=null;
		ArrayList data = new ArrayList();
		try {
			Class.forName("com.mysql.jdbc.Driver");
			conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/vapor?user=root&password=root");
			st = conn.createStatement();
			rt = st.executeQuery("SELECT * FROM vp_user");
			int index=0;
			
			while(rt.next())
			{
				data.add(rt.getString("uname"));
			}
		} catch (ClassNotFoundException e) {
			// TODO Auto-generated catch block
			System.out.println(e.toString());
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			System.out.println(e.toString());
		} finally {
			try {
				if(rt!=null){
					rt.close();
					rt=null;
				}
				
				if(st!=null){
					st.close();
					st=null;
				}
				
				if(conn!=null){
					conn.close();
					conn=null;
				}
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				System.out.println(e.toString());
			}			
		}
		
		return data;
	}