使用JDBC从数据库中查询数据

@Test
    public void testResultSet(){
        //获取id=2的customers数据表的记录，并打印
        Connection connection = null;
        Statement statement = null;
        ResultSet rs = null;
        try {
            //1.获取Connection
            connection = JDBCTools.getConnection();
            //2.获取Statement
            statement = connection.createStatement();
            //3.准备Sql
            String sql = "SELECT * FROM CUSTOMERS WHERE ID=2";
            //4.执行查询，得到ResultSet
            rs = statement.executeQuery(sql);
            //5.处理ResultSet
            while(rs.next()){
                //rs.get+数据库中对应的类型+(数据库中对应的列别名)
                int id = rs.getInt("ID");
                String name = rs.getString("name");
                String email = rs.getString("email");
                Date birth = rs.getDate("birth");
                
                System.out.println(id);
                System.out.println(name);
                System.out.println(email);
                System.out.println(birth);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }finally{
            //6.关闭数据库相应的资源
            JDBCTools.release(rs, statement, connection);
        }
    }