基本操作 Basic CRUD
在进行此ơ操作之前，我们先创Z个数据库:Sample3.Mdb Q依然将它放在C盘根目录下，q且创徏一个名为Users的表Q表有两个字D，一个IDQ一个NameQ其中ID是主键，且是“自动~号”。然后向里边插入两条数据。此Ӟ表是q个样子?
| ID | Name |
| 1 | elephant |
| 2 | elephant1 |
#CRUD:create, retrieve, update, and delete。创建（插入Q，查询Q更斎ͼ删除Q这是标准的数据库操作。在我们Ҏ据库的操作中Q针Ҏ一个对象的操作基本都是CRUD?/span>
好，开始我们的操作Q首先是查询Q?/span>
一Q查?/span>
1.ҎID查询一条数?/span>
查询一条数?/span>
输出是这LQ?/span>
The first data is:{ Id = 1, Name = elephant }
q样Q我们就从数据表Users中查询到了ID?的一条数据?/span>
2.查询数据表中的所有数?/span>
查询所有数?/span>输出为：
{ Id = 1, Name = elephant }
{ Id = 2, Name = elephant1}
#WhereCondition.EmptyCondition 表示一个空的条Ӟx条g
#DbEntry.From<Users>().Where(WhereCondition.EmptyCondition).Select();
#q里的Select()q回的是一个DbObjectList<T>Q单从字面理解，我们的Userscȝ承了DbObjectQ那么返回的q个DbObjectList是一个DbObject的List
二．更新
我们第二条数据的Name字段修改?#8220;enzosoft”Q?/span>
更新操作#q段代码是这样工作的Q?/span>
首先取得一个ID?的对象uQ然后将u的Name属性修改ؓ“enzosoft”Q然后进行保存?/span>
现在表中的数据ؓQ?/span>
| ID | Name |
| 1 | elephant |
| 2 | enzosoft |
三．插入
我们在上一中Q已l明地使用了插入，现在Q?/span>
插入操作q个׃多做解释了，表中的数据ؓQ?/span>
| ID | Name |
| 1 | elephant |
| 2 | enzosoft |
| 3 | blogjava |
四．删除
因ؓ删除操作会媄响到我们的演C，所以就攑ֈ最后来说明了~
1.删除一条数?/span>
(我的Blog用户名太MQ我自己都不知道当时Z么会q么注册。。唉。。怨念啊~~)
二话不说Q删了它Q?/span>
删除操作Ok,怨念的用户名被我删掉了，此时表中的数据ؓ:
| ID | Name |
| 1 | elephant |
| 3 | blogjava |
2.删除所有符合条件的数据
删除操作执行它，数据表中的数据ؓQ?/span>
ID
Name
#DbEntry.Delete<Users>(WhereCondition.EmptyCondition) 删除了一些数据，q些数据没有M判定条gQ则是所有的数据
基本的CRUD操作已经介绍完毕~下一，我们l箋Dbentry.Net之旅~
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Copyright (C) 2008 Lephone Studio <http://llf.hanzify.org>
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it is not allowed.
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"The Library" refers to a covered work governed by this License, other than an Application or a
Combined Work as defined below.
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]]>
W一个程?/span>
如果我们惌样做Q?/span>
首先Q在Access数据库中动态创Z个名为Users的表Q然后，向表中插入一条数据?/span>
那么Q我的做法是q样的：
先用Access2003创徏一个名为Sample2n.mdb的数据库Qؓ了得整个过E和数据的变更比较清晎ͼ我将它放到C:"根目录下?/span>
假设表的l构Q?nbsp; [ID][Name] # IDZ键，且自动增?/em>
E序的引用：
E序的引?/span>#ADODB d引用->COM->Microsoft ActiveX Data Objects 2.8 Library
#ADOX d引用->COM->Microsoft ADO Ext. 2.8 for DDL and Security
创徏表的E序:
创徏表的E序好了,现在我们来执行它:
2
3 {
4
5 CreateTable();
6
7 }
Ok,执行后，我们打开数据库，会发现多一个结构如下的Users表：
ID
Name
成功Q现在来做第二步Q向q个表中d一条数据，比如Elephant 攑ֈ里边?/span>
向数据表中插入一条数?/span>执行它：
2
3 {
4
5 //CreateTable();
6
7 InsertData();
8
9 }
再打开表数据库-->Users?
ID
Name
1
elephant
实成功插入了一条数据?/span>
q就是我在完成这么一个小的d时所做的十分复杂的工作，当然Q你的做法肯定比我简单，不过单不q它--DbEntryNet?/span>
先用Access2003创徏一个名为Sample2n.mdb的数据库Q也它攑ֈC盘根目录?
使用DbEntry.NetQ首先添加它的引用，在此ơ测试中Q只需dLephone.Data.dll ?/span>Lephone.Util.dll卛_?/span>
#d引用->览->Lephone.Data.Dll Lephone.Util.dll
在项目中d一个应用程序配|文件?/span>
#d->新徏?>应用E序配置文g->App.Config
修改里边的内容ؓ:
App.config然后我们新徏一个类,cd为我们的表名:Users
然后输入如下内容:
Users.csq样来用它:
2
3 {
4
5 Users u = new Users();
6
7 u.Name = "elephant";
8
9 DbEntry.Insert(u);
10
11 }
OKQ结束了Q打开我们的数据库Sample2d.Mdb来查看：
Id
Name
1
elephant
是不是感觉很奇Q?/span>
我们来简要地分析一下这个程?
首先Q我们设|了DbEntry.Net可以自动创徏数据表?/span>
打开App.Config,可以看到如下内容Q?/span>
<add key="AutoCreateTable" value="true" />
q个配置的意义就在于让DbEntry.Net知道Q它是可以自动地d?/span>
然后Q新建的cL件Users.cs.
我们Z么要它命名为UsersQ现在我们仅仅需要知道，它跟我们的表名是一致的?/span>
而且它承了DbObject
最后，我们q行?#8220;插入”操作?/span>
2
3 u.Name = "elephant";
4
5 DbEntry.Insert(u);
OKQ我们的W一个程序就完成了，大家可以仔细地观察下每个文gQƈdq个目的主去查看原作者的文章?/span>
下一，我们l箋DbEntry.Net之旅~
]]>
DbEntry.Net ?br />
DbEntry.Net 介：
DbEntry.Net (Lephone Framework) 是一个用?Net 2.0 ?nbsp;3.5 的，轻量U高性能的组件。它拥有清晰的、易用的~程接口。它ZADO.NETQƈ支持C#、VB.Net{多U开发语a。它qؓAsp.Net 2.0 ?nbsp;Ruby on Rails 的MVC 框架提供了一个数据源?/span>DbEntryDataSource,q有一个简易的IoC框架。最新的版本已经在如下数据库pȝ中测试通过Q?/span>
Sql Server 2005 ExpressQ?/span>MySql 5.0Q?/span>SQLite 3Q?/span>Access 2003Q?/span>
Firebird 2.1.0Q?/span>PostgreSQL 8.3.3 Q?/span>Oracle 10g express?/span>
*在以后的译及测试中Q请注意q些l节?
#IoC:译ؓ“反{控制”Q早期称为DIQ?/span>Dependency InjectionQ?依赖注入。是一个重要的、面向对象编E的、削q序耦合度的法则Q是一U设计模式?/span>
用一个列表来单表qCq内容：
· 目标用户QDevelopers
· 开源协议：Mozilla Public License 1.1 (MPL 1.1)
· 操作pȝQ?nbsp;32-bit MS Windows (NT/2000/XP)
· ~程语言QC#, Visual Basic .NET
· 主题Q?/span>Database Engines/Servers
· 支持语种Q?nbsp;Chinese (Simplified), English
· .Netq_Q?nbsp;2.0 ?nbsp;3.5
· 支持数据库系l：常见pȝQ?/span>*注意版本*Q?/span>
Ҏ：
· Linq技术的支持Q需?NET 3.5Q（Linq support (need .net 3.5)Q?/span>
· q箋接口查询语法 (Fluent Interface query syntax)
· Ruby On Rails 的ActiveRecord 语法支持Q?/span>RoR ActiveRecord style syntaxQ?/span>
· 环境事务 Q?/span>Ambient transactionQ?/span>
· 动态对?nbsp;QDynamic ObjectQ?/span>
· 部分更新提交 QPartial UpdateQ?/span>
· 1?Q?对多Q多对多 关系 Q?/span>1:1 1:Many Many:Many relationsQ?/span>
· 数据表自动创?nbsp;Q?/span>Auto create tableQ?/span>
· 防sql注入 Q?/span>Anti sql injectionQ?/span>
· 多层数据源配|?nbsp;Q?/span>Multiple data sourceQ?/span>
· 对象验证 QObject ValidationQ?/span>*待商?
· Nullable 支持 Q?/span>Nullable SupportQ?/span>
· DbEntryDataSource
· ASP.NET 2.0 中的 Membership 支持 Q?/span>ASP.NET 2.0 Membership SupportQ?/span>
· 内徏~存支持Q?/span>Built-in Cache SupportQ?/span>
枯燥的说明是必要的，l束了说明，我们开始轻杄DbEntry.Net之旅!
]]>
谢谢您给予的帮助?
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