Retrieving Data from the Provider This section describes how to retrieve data from a provider, using the User Dictionary Provider as an example. For the sake of clarity, the code snippets in this section call ContentResolver.query() on the "UI thread
说明:SQL语句大小写都可以,执行一句时,后面可不加分号,如果同时执行两句,就必须加分号,不然会报错. --+空格 是SQL的注释 表格名为users,里面有name和age属性 一.增 insert into INSERT INTO users (name,age) values('张三',25); 可以写insert into,也可以只写insert 二.删 delete form DELETE FROM users WHERE name="张三": where是用来判断的,类似
转自:http://cthhqu.blog.51cto.com/7598297/1281217 1. ContentProvider的概述 ContentProvider: (Official Definition)Content providers manage access to a structured set of data. They encapsulate the data, and provide mechanisms for defining data security. Con
自己写的一个SqlHelper,感觉使用起来挺方便的 using System; using System.Data; using System.Collections.Generic; using System.Configuration; using System.Text; using System.IO; using System.Data.SqlClient; namespace NdfDeviceNetC { public class SqlHelper { //数据库连接字符串 p
class Pet { public string Name{get;set;} public int Age{get;set;} } void Main() { Pet[] pets = { }, }, } }; //如果我们想根据Age进行排序 很容易想到这样来写: var query= from p in pets orderby p.Age select p; query.ToList().ForEach(q=>Console.WriteLine(q.Name +" "+
只是一个用EF写的一个简单的分页方法而已 慢慢的写吧.比如,第一步,先把所有数据查询出来吧. //第一步. public IQueryable<UserInfo> LoadPagesForUserInfos(int pageSize, int pageIndex, out int total) { DataModelContainer db = new DataModelContainer(); total = db.UserInfo.Count(); )).Skip(pageSize).As
看了下当前最热门的php开发框架,想对比一下自己写的框架与这些框架的性能对比.先看下当前流行框架的投票情况. 看结果对比,每个测试脚本做了一个数据库的联表查询并进行print_r输出,查询的sql语句: SELECT ad.adid, ad.title, ad.image, ad.url, ad.info, ad.orderby,ad.dataid,ad.idtype,adp.keyword,adp.name as adpName FROM `erp_ad` ad LEFT JOIN erp_a
