上期内容回顾 聚合查询和分组查询 # 聚合查询 max min sum avg count # 查询关键字:aggregate from django.db.models import Max, Min, Sum, Avg, Count res = Book.objects.aggregate(max_price=Max('price'), ) # 分组查询 group by """ 默认情况下,分组之后依然可以查询到所有的字段数据,如果设置为了严格模式,只能获取到分组的那个
一.Httpclient发送json请求 public String RequestJsonPost(String url){ String strresponse = null; try{ HttpClient hc = new DefaultHttpClient(); HttpPost hp = new HttpPost(url); JSONObject jsonParam = new JSONObject(); jsonPara
转自:http://www.cnblogs.com/digdeep/p/5574366.html 1.前台页面 <%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"