24、ASP.NET MVC入门到精通——数据库仓储

本系列目录:ASP.NET MVC4入门到精通系列目录汇总

业务层调用数据层对象,我不想每次都new一个数据层对象,而是在数据层创建一个仓储,统一管理所有的对象调用。

1、在IDAL项目中,新建IDBSession.tt模板

<#@ template language="C#" debug="false" hostspecific="true"#>
<#@ include file="EF.Utility.CS.ttinclude"#><#@ output extension=".cs"#> 
<#
CodeGenerationTools code = new CodeGenerationTools(this);
MetadataLoader loader = new MetadataLoader(this);
CodeRegion region = new CodeRegion(this, 1);
MetadataTools ef = new MetadataTools(this);
string inputFile = @"..\MODEL\OA.edmx";
EdmItemCollection ItemCollection = loader.CreateEdmItemCollection(inputFile);
string namespaceName = code.VsNamespaceSuggestion();
EntityFrameworkTemplateFileManager fileManager = EntityFrameworkTemplateFileManager.Create(this);
#>
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace IDAL
{
public partial interface IDBSession
{
<#
    // Emit Entity Types
foreach (EntityType entity in ItemCollection.GetItems<EntityType>().OrderBy(e => e.Name))
{
#>
   I<#=entity.Name#>DAL I<#=entity.Name#>DAL{get;set;}
<#}#>
}
}
View Code

Ctrl+S后自动生成IDBSession接口

 
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace IDAL
{
public partial interface IDBSession
{
   IBill_LeaveDAL IBill_LeaveDAL{get;set;}
   IoldWF_AutoTransactNodeDAL IoldWF_AutoTransactNodeDAL{get;set;}
   IoldWF_BillFlowNodeDAL IoldWF_BillFlowNodeDAL{get;set;}
   IoldWF_BillFlowNodeRemarkDAL IoldWF_BillFlowNodeRemarkDAL{get;set;}
   IoldWF_BillStateDAL IoldWF_BillStateDAL{get;set;}
   IoldWF_NodeDAL IoldWF_NodeDAL{get;set;}
   IoldWF_NodeStateDAL IoldWF_NodeStateDAL{get;set;}
   IoldWF_WorkFlowDAL IoldWF_WorkFlowDAL{get;set;}
   IoldWF_WorkFlowNodeDAL IoldWF_WorkFlowNodeDAL{get;set;}
   IOu_DepartmentDAL IOu_DepartmentDAL{get;set;}
   IOu_PermissionDAL IOu_PermissionDAL{get;set;}
   IOu_RoleDAL IOu_RoleDAL{get;set;}
   IOu_RolePermissionDAL IOu_RolePermissionDAL{get;set;}
   IOu_UserInfoDAL IOu_UserInfoDAL{get;set;}
   IOu_UserRoleDAL IOu_UserRoleDAL{get;set;}
   IOu_UserVipPermissionDAL IOu_UserVipPermissionDAL{get;set;}
   IW_WorkFlowDAL IW_WorkFlowDAL{get;set;}
   IW_WorkFlowBranchDAL IW_WorkFlowBranchDAL{get;set;}
   IW_WorkFlowNodeDAL IW_WorkFlowNodeDAL{get;set;}
   IW_WrokFlowRoleDAL IW_WrokFlowRoleDAL{get;set;}
   IWR_WorkFlowApplyDAL IWR_WorkFlowApplyDAL{get;set;}
   IWR_WrokFlowApplyDetailsDAL IWR_WrokFlowApplyDetailsDAL{get;set;}
}
}
View Code

2、在DAL项目中实现IDBSession接口

新建DBSession.tt模板

<#@ template language="C#" debug="false" hostspecific="true"#>
<#@ include file="EF.Utility.CS.ttinclude"#><#@ output extension=".cs"#> 
<#
CodeGenerationTools code = new CodeGenerationTools(this);
MetadataLoader loader = new MetadataLoader(this);
CodeRegion region = new CodeRegion(this, 1);
MetadataTools ef = new MetadataTools(this);
string inputFile = @"..\MODEL\OA.edmx";
EdmItemCollection ItemCollection = loader.CreateEdmItemCollection(inputFile);
string namespaceName = code.VsNamespaceSuggestion();
EntityFrameworkTemplateFileManager fileManager = EntityFrameworkTemplateFileManager.Create(this);
#>
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using IDAL;

namespace DAL
{
public partial class DBSession:IDBSession
{
<#
int index=0;
    // Emit Entity Types
foreach (EntityType entity in ItemCollection.GetItems<EntityType>().OrderBy(e => e.Name))
{
index++;
#>
    #region <#=index #> 数据接口 I<#=entity.Name#>DAL
   I<#=entity.Name#>DAL i<#=entity.Name#>DAL;
  public I<#=entity.Name#>DAL I<#=entity.Name#>DAL{
   get
   {
   if(i<#=entity.Name#>DAL==null)
      i<#=entity.Name#>DAL=new <#=entity.Name#>DAL();
      return  i<#=entity.Name#>DAL;
   }
   set
   {
    i<#=entity.Name#>DAL=value;
   }
   }
   #endregion

<#}#>
}
}
View Code

Ctrl+S后自动生成DBSession类

 
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using IDAL;

namespace DAL
{
public partial class DBSession:IDBSession
{
    #region 1 数据接口 IBill_LeaveDAL
   IBill_LeaveDAL iBill_LeaveDAL;
  public IBill_LeaveDAL IBill_LeaveDAL{
   get
   {
   if(iBill_LeaveDAL==null)
      iBill_LeaveDAL=new Bill_LeaveDAL();
      return  iBill_LeaveDAL;
   }
   set
   {
    iBill_LeaveDAL=value;
   }
   }
   #endregion

    #region 2 数据接口 IoldWF_AutoTransactNodeDAL
   IoldWF_AutoTransactNodeDAL ioldWF_AutoTransactNodeDAL;
  public IoldWF_AutoTransactNodeDAL IoldWF_AutoTransactNodeDAL{
   get
   {
   if(ioldWF_AutoTransactNodeDAL==null)
      ioldWF_AutoTransactNodeDAL=new oldWF_AutoTransactNodeDAL();
      return  ioldWF_AutoTransactNodeDAL;
   }
   set
   {
    ioldWF_AutoTransactNodeDAL=value;
   }
   }
   #endregion

    #region 3 数据接口 IoldWF_BillFlowNodeDAL
   IoldWF_BillFlowNodeDAL ioldWF_BillFlowNodeDAL;
  public IoldWF_BillFlowNodeDAL IoldWF_BillFlowNodeDAL{
   get
   {
   if(ioldWF_BillFlowNodeDAL==null)
      ioldWF_BillFlowNodeDAL=new oldWF_BillFlowNodeDAL();
      return  ioldWF_BillFlowNodeDAL;
   }
   set
   {
    ioldWF_BillFlowNodeDAL=value;
   }
   }
   #endregion

    #region 4 数据接口 IoldWF_BillFlowNodeRemarkDAL
   IoldWF_BillFlowNodeRemarkDAL ioldWF_BillFlowNodeRemarkDAL;
  public IoldWF_BillFlowNodeRemarkDAL IoldWF_BillFlowNodeRemarkDAL{
   get
   {
   if(ioldWF_BillFlowNodeRemarkDAL==null)
      ioldWF_BillFlowNodeRemarkDAL=new oldWF_BillFlowNodeRemarkDAL();
      return  ioldWF_BillFlowNodeRemarkDAL;
   }
   set
   {
    ioldWF_BillFlowNodeRemarkDAL=value;
   }
   }
   #endregion

    #region 5 数据接口 IoldWF_BillStateDAL
   IoldWF_BillStateDAL ioldWF_BillStateDAL;
  public IoldWF_BillStateDAL IoldWF_BillStateDAL{
   get
   {
   if(ioldWF_BillStateDAL==null)
      ioldWF_BillStateDAL=new oldWF_BillStateDAL();
      return  ioldWF_BillStateDAL;
   }
   set
   {
    ioldWF_BillStateDAL=value;
   }
   }
   #endregion

    #region 6 数据接口 IoldWF_NodeDAL
   IoldWF_NodeDAL ioldWF_NodeDAL;
  public IoldWF_NodeDAL IoldWF_NodeDAL{
   get
   {
   if(ioldWF_NodeDAL==null)
      ioldWF_NodeDAL=new oldWF_NodeDAL();
      return  ioldWF_NodeDAL;
   }
   set
   {
    ioldWF_NodeDAL=value;
   }
   }
   #endregion

    #region 7 数据接口 IoldWF_NodeStateDAL
   IoldWF_NodeStateDAL ioldWF_NodeStateDAL;
  public IoldWF_NodeStateDAL IoldWF_NodeStateDAL{
   get
   {
   if(ioldWF_NodeStateDAL==null)
      ioldWF_NodeStateDAL=new oldWF_NodeStateDAL();
      return  ioldWF_NodeStateDAL;
   }
   set
   {
    ioldWF_NodeStateDAL=value;
   }
   }
   #endregion

    #region 8 数据接口 IoldWF_WorkFlowDAL
   IoldWF_WorkFlowDAL ioldWF_WorkFlowDAL;
  public IoldWF_WorkFlowDAL IoldWF_WorkFlowDAL{
   get
   {
   if(ioldWF_WorkFlowDAL==null)
      ioldWF_WorkFlowDAL=new oldWF_WorkFlowDAL();
      return  ioldWF_WorkFlowDAL;
   }
   set
   {
    ioldWF_WorkFlowDAL=value;
   }
   }
   #endregion

    #region 9 数据接口 IoldWF_WorkFlowNodeDAL
   IoldWF_WorkFlowNodeDAL ioldWF_WorkFlowNodeDAL;
  public IoldWF_WorkFlowNodeDAL IoldWF_WorkFlowNodeDAL{
   get
   {
   if(ioldWF_WorkFlowNodeDAL==null)
      ioldWF_WorkFlowNodeDAL=new oldWF_WorkFlowNodeDAL();
      return  ioldWF_WorkFlowNodeDAL;
   }
   set
   {
    ioldWF_WorkFlowNodeDAL=value;
   }
   }
   #endregion

    #region 10 数据接口 IOu_DepartmentDAL
   IOu_DepartmentDAL iOu_DepartmentDAL;
  public IOu_DepartmentDAL IOu_DepartmentDAL{
   get
   {
   if(iOu_DepartmentDAL==null)
      iOu_DepartmentDAL=new Ou_DepartmentDAL();
      return  iOu_DepartmentDAL;
   }
   set
   {
    iOu_DepartmentDAL=value;
   }
   }
   #endregion

    #region 11 数据接口 IOu_PermissionDAL
   IOu_PermissionDAL iOu_PermissionDAL;
  public IOu_PermissionDAL IOu_PermissionDAL{
   get
   {
   if(iOu_PermissionDAL==null)
      iOu_PermissionDAL=new Ou_PermissionDAL();
      return  iOu_PermissionDAL;
   }
   set
   {
    iOu_PermissionDAL=value;
   }
   }
   #endregion

    #region 12 数据接口 IOu_RoleDAL
   IOu_RoleDAL iOu_RoleDAL;
  public IOu_RoleDAL IOu_RoleDAL{
   get
   {
   if(iOu_RoleDAL==null)
      iOu_RoleDAL=new Ou_RoleDAL();
      return  iOu_RoleDAL;
   }
   set
   {
    iOu_RoleDAL=value;
   }
   }
   #endregion

    #region 13 数据接口 IOu_RolePermissionDAL
   IOu_RolePermissionDAL iOu_RolePermissionDAL;
  public IOu_RolePermissionDAL IOu_RolePermissionDAL{
   get
   {
   if(iOu_RolePermissionDAL==null)
      iOu_RolePermissionDAL=new Ou_RolePermissionDAL();
      return  iOu_RolePermissionDAL;
   }
   set
   {
    iOu_RolePermissionDAL=value;
   }
   }
   #endregion

    #region 14 数据接口 IOu_UserInfoDAL
   IOu_UserInfoDAL iOu_UserInfoDAL;
  public IOu_UserInfoDAL IOu_UserInfoDAL{
   get
   {
   if(iOu_UserInfoDAL==null)
      iOu_UserInfoDAL=new Ou_UserInfoDAL();
      return  iOu_UserInfoDAL;
   }
   set
   {
    iOu_UserInfoDAL=value;
   }
   }
   #endregion

    #region 15 数据接口 IOu_UserRoleDAL
   IOu_UserRoleDAL iOu_UserRoleDAL;
  public IOu_UserRoleDAL IOu_UserRoleDAL{
   get
   {
   if(iOu_UserRoleDAL==null)
      iOu_UserRoleDAL=new Ou_UserRoleDAL();
      return  iOu_UserRoleDAL;
   }
   set
   {
    iOu_UserRoleDAL=value;
   }
   }
   #endregion

    #region 16 数据接口 IOu_UserVipPermissionDAL
   IOu_UserVipPermissionDAL iOu_UserVipPermissionDAL;
  public IOu_UserVipPermissionDAL IOu_UserVipPermissionDAL{
   get
   {
   if(iOu_UserVipPermissionDAL==null)
      iOu_UserVipPermissionDAL=new Ou_UserVipPermissionDAL();
      return  iOu_UserVipPermissionDAL;
   }
   set
   {
    iOu_UserVipPermissionDAL=value;
   }
   }
   #endregion

    #region 17 数据接口 IW_WorkFlowDAL
   IW_WorkFlowDAL iW_WorkFlowDAL;
  public IW_WorkFlowDAL IW_WorkFlowDAL{
   get
   {
   if(iW_WorkFlowDAL==null)
      iW_WorkFlowDAL=new W_WorkFlowDAL();
      return  iW_WorkFlowDAL;
   }
   set
   {
    iW_WorkFlowDAL=value;
   }
   }
   #endregion

    #region 18 数据接口 IW_WorkFlowBranchDAL
   IW_WorkFlowBranchDAL iW_WorkFlowBranchDAL;
  public IW_WorkFlowBranchDAL IW_WorkFlowBranchDAL{
   get
   {
   if(iW_WorkFlowBranchDAL==null)
      iW_WorkFlowBranchDAL=new W_WorkFlowBranchDAL();
      return  iW_WorkFlowBranchDAL;
   }
   set
   {
    iW_WorkFlowBranchDAL=value;
   }
   }
   #endregion

    #region 19 数据接口 IW_WorkFlowNodeDAL
   IW_WorkFlowNodeDAL iW_WorkFlowNodeDAL;
  public IW_WorkFlowNodeDAL IW_WorkFlowNodeDAL{
   get
   {
   if(iW_WorkFlowNodeDAL==null)
      iW_WorkFlowNodeDAL=new W_WorkFlowNodeDAL();
      return  iW_WorkFlowNodeDAL;
   }
   set
   {
    iW_WorkFlowNodeDAL=value;
   }
   }
   #endregion

    #region 20 数据接口 IW_WrokFlowRoleDAL
   IW_WrokFlowRoleDAL iW_WrokFlowRoleDAL;
  public IW_WrokFlowRoleDAL IW_WrokFlowRoleDAL{
   get
   {
   if(iW_WrokFlowRoleDAL==null)
      iW_WrokFlowRoleDAL=new W_WrokFlowRoleDAL();
      return  iW_WrokFlowRoleDAL;
   }
   set
   {
    iW_WrokFlowRoleDAL=value;
   }
   }
   #endregion

    #region 21 数据接口 IWR_WorkFlowApplyDAL
   IWR_WorkFlowApplyDAL iWR_WorkFlowApplyDAL;
  public IWR_WorkFlowApplyDAL IWR_WorkFlowApplyDAL{
   get
   {
   if(iWR_WorkFlowApplyDAL==null)
      iWR_WorkFlowApplyDAL=new WR_WorkFlowApplyDAL();
      return  iWR_WorkFlowApplyDAL;
   }
   set
   {
    iWR_WorkFlowApplyDAL=value;
   }
   }
   #endregion

    #region 22 数据接口 IWR_WrokFlowApplyDetailsDAL
   IWR_WrokFlowApplyDetailsDAL iWR_WrokFlowApplyDetailsDAL;
  public IWR_WrokFlowApplyDetailsDAL IWR_WrokFlowApplyDetailsDAL{
   get
   {
   if(iWR_WrokFlowApplyDetailsDAL==null)
      iWR_WrokFlowApplyDetailsDAL=new WR_WrokFlowApplyDetailsDAL();
      return  iWR_WrokFlowApplyDetailsDAL;
   }
   set
   {
    iWR_WrokFlowApplyDetailsDAL=value;
   }
   }
   #endregion

}
}
View Code

接下来,我们创建DBSession工厂和上下文工厂,目的是为了提高效率,在线程中共用一个对象。

3、IDAL项目中添加IDBSessionFactory接口

namespace IDAL
{
    /// <summary>
    /// 数据仓储工厂
    /// </summary>
   public interface IDBSessionFactory
    {
       IDBSession GetDBSession();
    }
}

DAL项目中添加DBSessionFactory类继承IDBSessionFactory接口

using System.Runtime.Remoting.Messaging;
using IDAL;

namespace DAL
{
    public class DBSessionFactory : IDBSessionFactory
    {
        /// <summary>
        /// 此方法的作用: 提高效率,在线程中 共用一个 DBSession 对象!
        /// </summary>
        /// <returns></returns>
        public IDBSession GetDBSession()
        {
            //从当前线程中 获取 DBContext 数据仓储 对象
            IDBSession dbSesion = CallContext.GetData(typeof(DBSessionFactory).Name) as DBSession;
            if (dbSesion == null)
            {
                dbSesion = new DBSession();
                CallContext.SetData(typeof(DBSessionFactory).Name, dbSesion);
            }
            return dbSesion;
        }
    }
}

4、同样,我们再来创建一个上下文工厂,即便以后有多个数据库上下文,也能够很好的支持。

IDAL项目中,新建IDBContextFactory.cs接口

using System.Data.Entity;

namespace IDAL
{
    /// <summary>
    /// EF数据上下文 工厂
    /// </summary>
   public interface IDBContextFactory
    {
       /// <summary>
        /// 获取 EF 上下文对象
       /// </summary>
       /// <returns></returns>
       DbContext GetDbContext();
    }

DAL项目中新建DBContextFactory类继承IDBContextFactory接口

using System.Data.Entity;
using System.Runtime.Remoting.Messaging;
using Model;

namespace DAL
{
    public class DBContextFactory : IDBContextFactory
    {
        #region 创建 EF上下文 对象,在线程中共享 一个 上下文对象 + DbContext GetDbContext()
        /// <summary>
        /// 创建 EF上下文 对象,在线程中共享 一个 上下文对象
        /// </summary>
        /// <returns></returns>
        public DbContext GetDbContext()
        {
            ////从当前线程中 获取 EF上下文对象
            var dbContext = CallContext.GetData(typeof(DBContextFactory).Name) as DbContext;
            if (dbContext == null)
            {
                dbContext = new OAEntities();
                CallContext.SetData(typeof(DBContextFactory).Name, dbContext);
            }
            return dbContext;
        }
        #endregion
    }
}

5、Common项目中,添加ConfigurationHelper.cs来操作配置文件

using System;
using System.Configuration;

namespace Common
{
    public static class ConfigurationHelper
    {
        public static string AppSetting(string key)
        {
            return ConfigurationManager.AppSettings[key];
        }
    }
}

Web.config中添加如下配置节点:

    <add key="DBSessionFatory" value="DAL.DBSessionFactory" />
    <add key="DBSessionFatoryDLL" value="E:\WorkSpace\Study\Webs\MVC\OAsln\Web\bin\DAL.dll" />

6、修改BaseBLL类的调用方式,添加如下代码:

        /// <summary>
        /// 2.0 数据仓储接口(相当于数据层工厂,可以创建所有的数据子类对象)
        /// </summary>
        private IDAL.IDBSession iDbSession;

        #region 数据仓储 属性 + IDBSession DBSession
        /// <summary>
        /// 数据仓储 属性
        /// </summary>
        public IDAL.IDBSession DBSession
        {
            get
            {
                if (iDbSession == null)
                {
                    //1.读取配置文件
                    string strFactoryDLL = Common.ConfigurationHelper.AppSetting("DBSessionFatoryDLL");
                    string strFactoryType = Common.ConfigurationHelper.AppSetting("DBSessionFatory");
                    //2.1通过反射创建 DBSessionFactory 工厂对象
                    Assembly dalDLL = Assembly.LoadFrom(strFactoryDLL);
                    Type typeDBSessionFatory = dalDLL.GetType(strFactoryType);
                    IDAL.IDBSessionFactory sessionFactory = Activator.CreateInstance(typeDBSessionFatory) as IDAL.IDBSessionFactory;
                    //2.2根据配置文件内容 使用 DI层里的Spring.Net 创建 DBSessionFactory 工厂对象


                    //3.通过 工厂 创建 DBSession对象
                    iDbSession = sessionFactory.GetDBSession();
                }
                return iDbSession;
            }
        }
        #endregion

 在这里,使用到了工厂来创建对象,后面引入了Spring.net之后,会回过头来优化现有的代码。项目中使用到了许多接口,目的是为了解耦,每一个项目的职责尽量让其单一,业务层只让其调用数据层接口,也是为了依赖于抽象,而不是具体。每一个框架其实都是各种设计模式的一个集合,设计模式是为了解决一类问题,而框架就是为了解决一系列问题了。到现在为止,整个项目的雏形已经出来了,但是后续,我们一步一步来优化,好的框架不是一下子就能设计得完美的,而是能够不断的拥抱修改,可持续扩展,不断改进出来的。

posted @ 2015-12-14 09:25 邹琼俊 阅读(...) 评论(...) 编辑 收藏