原文:DevExpress ASP.NET 使用经验谈（1）-XPO模型的创建
这个系列通过一些简单例子循序渐进，介绍DevExpress ASP.NET控件的使用。先来介绍一下XPO的使用，安装的DevExpress版本为DXperienceUniversal-12.2.4，使用Visual Studio 2012+Sql Server2005。
什么是XPO？
XPO 是 eXpress Persistent Objects的缩写，它是DevExpress公司推出的一个运行在.NETFramwork平台上的ORM工具。Persistent Objects翻译过来时“持久化对象”的意思，所谓的持久化，也就是将数据存储下来，比如存在数据库、文件等这样的形式“永久的”保存下来。XPO是一个ORM工具，它在应用程序代码和数据库之间扮演了一个中间层的角色，起到中间桥梁这样一个作用，简单而言，就是将面向对象编程所建立的对象在数据库中做一个映射，使之和数据库中的表建立一一对应的关系。我们在面向对象编程的时候，只需要关心程序中的“对象”就可以了，XPO会自动的把我们对对象的操作反应到数据库中。
安装过程在此略过。。。
安装成功后，VS2012新建项目，就会有已安装DevExpress类别选项，如下图所示：
（图一） 新建解决方案
（图二）添加类库项目
（图三） 建立XPO的ORM模型向导
（图四）选择映射到现有数据库
（图五）选择数据库，输入UserName，Password，此处勾选导和存储过程，后续步骤将出现存储过程选择界面
（图六） 确认选择的表
（图七）确认选择的存储过程
（图八）数据库表、字段前缀、后缀等设置
（图九）完成
（图十） 新建模型未保存界面
（图十一）新建模型保存后，生成XXXCode目录
（图十二） 生成代码目录结构
自动生成的代码：
ConnectionHelper.cs
using System;
using DevExpress.Xpo;
using DevExpress.Data.Filtering;
namespace XPOModel.DemoDB
{
public static class ConnectionHelper
{
public const string ConnectionString = @"XpoProvider=MSSqlServer;data source=.;user id=demo;password=demo;initial catalog=DemoDB;Persist Security Info=true";
public static void Connect(DevExpress.Xpo.DB.AutoCreateOption autoCreateOption)
{
XpoDefault.DataLayer = XpoDefault.GetDataLayer(ConnectionString, autoCreateOption);
XpoDefault.Session = null;
}
public static DevExpress.Xpo.DB.IDataStore GetConnectionProvider(DevExpress.Xpo.DB.AutoCreateOption autoCreateOption)
{
return XpoDefault.GetConnectionProvider(ConnectionString, autoCreateOption);
}
public static DevExpress.Xpo.DB.IDataStore GetConnectionProvider(DevExpress.Xpo.DB.AutoCreateOption autoCreateOption, out IDisposable[] objectsToDisposeOnDisconnect)
{
return XpoDefault.GetConnectionProvider(ConnectionString, autoCreateOption, out objectsToDisposeOnDisconnect);
}
public static IDataLayer GetDataLayer(DevExpress.Xpo.DB.AutoCreateOption autoCreateOption)
{
return XpoDefault.GetDataLayer(ConnectionString, autoCreateOption);
}
}
}
StoredProcHelper.cs
using System;
using DevExpress.Xpo;
using DevExpress.Data.Filtering;
namespace XPOModel.DemoDB
{
public static class SprocHelper
{
public static DevExpress.Xpo.DB.SelectedData ExecAspNetPager(Session session, int pageSize, int curPage, string viewName, string fieldName, string orderField, string orderType, string where1)
{
return session.ExecuteSproc("", new OperandValue(pageSize), new OperandValue(curPage), new OperandValue(viewName), new OperandValue(fieldName), new OperandValue(orderField), new OperandValue(orderType), new OperandValue(where1));
}
public static DevExpress.Xpo.DB.SelectedData ExecSelectjqGridUsers(Session session, int PageIndex, string SortColumnName, string SortOrderBy, int NumberOfRows)
{
return session.ExecuteSproc("SelectjqGridUsers", new OperandValue(PageIndex), new OperandValue(SortColumnName), new OperandValue(SortOrderBy), new OperandValue(NumberOfRows));
}
public static System.Collections.Generic.ICollection<SelectjqGridUsersResult> ExecSelectjqGridUsersIntoObjects(Session session, int PageIndex, string SortColumnName, string SortOrderBy, int NumberOfRows)
{
return session.GetObjectsFromSproc<SelectjqGridUsersResult>("SelectjqGridUsers", new OperandValue(PageIndex), new OperandValue(SortColumnName), new OperandValue(SortOrderBy), new OperandValue(NumberOfRows));
}
public static XPDataView ExecSelectjqGridUsersIntoDataView(Session session, int PageIndex, string SortColumnName, string SortOrderBy, int NumberOfRows)
{
DevExpress.Xpo.DB.SelectedData sprocData = session.ExecuteSproc("SelectjqGridUsers", new OperandValue(PageIndex), new OperandValue(SortColumnName), new OperandValue(SortOrderBy), new OperandValue(NumberOfRows));
return new XPDataView(session.Dictionary, session.GetClassInfo(typeof(SelectjqGridUsersResult)), sprocData);
}
public static void ExecSelectjqGridUsersIntoDataView(XPDataView dataView, Session session, int PageIndex, string SortColumnName, string SortOrderBy, int NumberOfRows)
{
DevExpress.Xpo.DB.SelectedData sprocData = session.ExecuteSproc("SelectjqGridUsers", new OperandValue(PageIndex), new OperandValue(SortColumnName), new OperandValue(SortOrderBy), new OperandValue(NumberOfRows));
dataView.PopulateProperties(session.GetClassInfo(typeof(SelectjqGridUsersResult)));
dataView.LoadData(sprocData);
}
}
}
Users.cs
using System;
using DevExpress.Xpo;
using DevExpress.Data.Filtering;
namespace XPOModel.DemoDB
{
public partial class Users
{
public Users(Session session) : base(session) { }
public override void AfterConstruction() { base.AfterConstruction(); }
}
}
Users.Designer.cs
using System;
using DevExpress.Xpo;
using DevExpress.Data.Filtering;
namespace XPOModel.DemoDB
{
public partial class Users : XPLiteObject
{
int fUserID;
[Key(true)]
public int UserID
{
get { return fUserID; }
set { SetPropertyValue<int>("UserID", ref fUserID, value); }
}
string fUserName;
[Size(50)]
public string UserName
{
get { return fUserName; }
set { SetPropertyValue<string>("UserName", ref fUserName, value); }
}
string fFirstName;
[Size(50)]
public string FirstName
{
get { return fFirstName; }
set { SetPropertyValue<string>("FirstName", ref fFirstName, value); }
}
string fLastName;
[Size(50)]
public string LastName
{
get { return fLastName; }
set { SetPropertyValue<string>("LastName", ref fLastName, value); }
}
string fMiddleName;
[Size(50)]
public string MiddleName
{
get { return fMiddleName; }
set { SetPropertyValue<string>("MiddleName", ref fMiddleName, value); }
}
string fEmailID;
[Size(50)]
public string EmailID
{
get { return fEmailID; }
set { SetPropertyValue<string>("EmailID", ref fEmailID, value); }
}
}
}
至此，已经完成了从数据库到XPO模型的创建，接下来开始使用XPO对象，看看它给我们带来了什么？
下一节中，我们继续使用XPO，结合XpoDataSource与ASPxGridView，以极少的代码，完成单表CRUD操作。
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附示例数据库的建库脚本，使用SQL Server2005 数据库，SQL语句如下：
CREATE DATABASE [DemoDB] ON PRIMARY
( NAME = N'DemoDB', FILENAME = N'C:\DemoDB.mdf' , SIZE = 3072KB , FILEGROWTH = 1024KB )
LOG ON
( NAME = N'DemoDB_log', FILENAME = N'C:\DemoDB_log.ldf' , SIZE = 1024KB , FILEGROWTH = 10%)
GO
EXEC dbo.sp_dbcmptlevel @dbname=N'DemoDB', @new_cmptlevel=90
GO
IF (1 = FULLTEXTSERVICEPROPERTY('IsFullTextInstalled'))
begin
EXEC [DemoDB].[dbo].[sp_fulltext_database] @action = 'disable'
end
GO
ALTER DATABASE [DemoDB] SET ANSI_NULL_DEFAULT OFF
GO
ALTER DATABASE [DemoDB] SET ANSI_NULLS OFF
GO
ALTER DATABASE [DemoDB] SET ANSI_PADDING OFF
GO
ALTER DATABASE [DemoDB] SET ANSI_WARNINGS OFF
GO
ALTER DATABASE [DemoDB] SET ARITHABORT OFF
GO
ALTER DATABASE [DemoDB] SET AUTO_CLOSE OFF
GO
ALTER DATABASE [DemoDB] SET AUTO_CREATE_STATISTICS ON
GO
ALTER DATABASE [DemoDB] SET AUTO_SHRINK OFF
GO
ALTER DATABASE [DemoDB] SET AUTO_UPDATE_STATISTICS ON
GO
ALTER DATABASE [DemoDB] SET CURSOR_CLOSE_ON_COMMIT OFF
GO
ALTER DATABASE [DemoDB] SET CURSOR_DEFAULT GLOBAL
GO
ALTER DATABASE [DemoDB] SET CONCAT_NULL_YIELDS_NULL OFF
GO
ALTER DATABASE [DemoDB] SET NUMERIC_ROUNDABORT OFF
GO
ALTER DATABASE [DemoDB] SET QUOTED_IDENTIFIER OFF
GO
ALTER DATABASE [DemoDB] SET RECURSIVE_TRIGGERS OFF
GO
ALTER DATABASE [DemoDB] SET AUTO_UPDATE_STATISTICS_ASYNC OFF
GO
ALTER DATABASE [DemoDB] SET DATE_CORRELATION_OPTIMIZATION OFF
GO
ALTER DATABASE [DemoDB] SET PARAMETERIZATION SIMPLE
GO
ALTER DATABASE [DemoDB] SET READ_WRITE
GO
ALTER DATABASE [DemoDB] SET RECOVERY FULL
GO
ALTER DATABASE [DemoDB] SET MULTI_USER
GO
ALTER DATABASE [DemoDB] SET PAGE_VERIFY CHECKSUM
GO
USE [DemoDB]
GO
IF NOT EXISTS (SELECT name FROM sys.filegroups WHERE is_default=1 AND name = N'PRIMARY') ALTER DATABASE [DemoDB] MODIFY FILEGROUP [PRIMARY] DEFAULT
GO
USE [DemoDB]
GO
/****** Object: Table [dbo].[Users] Script Date: 2014/11/27 13:36:56 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[Users](
[UserID] [int] IDENTITY(1,1) NOT NULL,
[UserName] [nvarchar](50) NULL,
[FirstName] [nvarchar](50) NULL,
[LastName] [nvarchar](50) NULL,
[MiddleName] [nvarchar](50) NULL,
[EmailID] [nvarchar](50) NULL,
CONSTRAINT [PK_Users] PRIMARY KEY CLUSTERED
(
[UserID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO