JDBC（Java DataBase Connectivity,java資料庫連線）是一種用SQL語句操作資料庫的Java API，可對關係資料庫進行增刪改查等的操作。

DButils是一個封裝了對JDBC操作的類庫，簡化了操作程式碼。

JDBC查詢程式碼：

  public static Account get(String id){
        String sql = "SELECT * FROM account WHERE accountId=?";
        Connection conn = DButil.getConnection();
        try {
            PreparedStatement ps = conn.prepareStatement(sql);
            ps.setString(1,accountId);
            ResultSet rs = ps.executeQuery();
            while (rs.next()){
                Account account = new Account();
                account.setAccountId(rs.getString("accountId"));
                account.setPassword(rs.getString("password"));
                account.setName(rs.getString("name"));
                account.setPhone(rs.getString("phone"));
                account.setCountry(rs.getString("country"));
                account.setRole(rs.getByte("role"));
                return account;
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return null;
        }
 

DButils查詢程式碼：

  public static Account get(String id){
        String sql = "select * from account where id=?";
        Connection conn = DButil.getConnection();
        QueryRunner qr = new QueryRunner();
        Object params[] = {id};
        try {
            return qr.query(conn,sql,new BeanHandler<Account>(Account.class),params);
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return null;
        }
 

節約了時間提高了開發效率。