Abstract Factory 抽象工厂设计模式
2009-11-27 14:14
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简单工厂模式虽然实现了使对象的创建与使用进行分离,但一次只能创建一个对象。它不能实现一次创建一系列相互依赖对象的需求,为此我们需要学习抽象工厂模式。
![](http://images.cnblogs.com/cnblogs_com/xugang/pattern_001.GIF)
抽象工厂:主要功能是生产抽象产品; 如:生产学员、管理员等抽象产品。
抽象产品:主要功能是提供实体产品访问接口; 如:提供学员、管理员等实体产品数据访问的接口。
实体工厂:主要功能是生产实体产品; 如:SQL Server和Access形式的学员、管理员等数据访问对象。
实体产品:主要功能是实现自己的功能; 如:分别实现不同的数据库访问。
对 MySchoolPro(项目)的数据访问层用抽象工厂设计模式进行改造,如下图所示:
![](http://images.cnblogs.com/cnblogs_com/xugang/pattern_002.GIF)
抽象工厂(Abstract Factory)设计模式的使用思路概括如下:
提供一系列相互依赖对象的创建;
封装对象的常规创建方法(new);
提供统一调用数据访问方法的方式;
避免调用数据访问方法和具体对象创建工作的紧偶合。
抽象工厂(Abstract Factory)设计模式的概念:
提供一个创建一系列相关或相互依赖对象的接口,而无需指定它们具体的类。
抽象工厂(Abstract Factory)设计模式的使用场合:
一个系统要独立于它产品的创建、组合和表示时。
一个系统要由多个产品系列中的一个来配置时。
[b]MySchoolPro(项目)应用示例
[/b]
![](http://images.cnblogs.com/cnblogs_com/xugang/MySchool_001.JPG)
用抽象工厂设计模式实现的数据访问层
![](http://images.cnblogs.com/cnblogs_com/xugang/pattern_003.GIF)
抽象工厂设计模式与项目中使用的类、接口的对应关系
![](http://images.cnblogs.com/cnblogs_com/xugang/pattern_004.GIF)
项目间的依赖关系
项目MySchoolIDAL:提供信息数据访问接口
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
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IStudentService
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Collections.Generic;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Text;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Data;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Data.SqlClient;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using MySchoolModels; //引用实体类
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
/**//* ******************************
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
* 接口名:IStudentService
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
* 功能描叙:提供学员信息数据访问接口
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
* *****************************/
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
namespace MySchoolIDAL
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
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{
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public interface IStudentService
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
Student GetStudentByLoginID(string loginId);
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
IAdminService
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Collections.Generic;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Text;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Data;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Data.SqlClient;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using MySchoolModels; //引用实体类
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
/**//* ******************************
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
* 接口名:IAdminService
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
* 功能描叙:提供管理员信息数据访问接口
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
* *****************************/
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
namespace MySchoolIDAL
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
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{
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public interface IAdminService
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
Admin GetAdminByLoginID(string loginId);
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
}
项目MySchoolDAL:提供信息数据访问
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
StudentService
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Collections.Generic;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Text;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Configuration;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Data;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Data.SqlClient;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using MySchoolModels; //引用实体类
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using MySchoolIDAL; //引用抽象访问接口
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
/**//* ******************************
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
* 接口名:StudentService
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
* 功能描叙:提供学员信息数据访问
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
* *****************************/
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
namespace MySchoolDAL.SqlServer
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{
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public class StudentService: IStudentService
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![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
Private Members#region Private Members
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
// 从配置文件中读取数据库连接字符串
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
private readonly string connString =
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
ConfigurationSettings.AppSettings["MySchoolConnectionString"].ToString();
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private readonly string dboOwner =
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
ConfigurationSettings.AppSettings["DataBaseOwner"].ToString();
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
#endregion
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
Public Methods#region Public Methods
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
/**//// <summary>
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
/// 根据登录ID 得到学员实体
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
/// </summary>
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
/// <param name="loginID">登录ID</param>
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
/// <returns>学员信息实体</returns>
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public Student GetStudentByLoginID(string loginID)
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
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{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
Student student = new Student();
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
using (SqlConnection conn = new SqlConnection(connString))
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
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{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
SqlCommand objCommand = new SqlCommand(dboOwner + ".usp_SelectStudentInfoByLoginID",conn);
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
objCommand.Parameters.Add("@LoginID", SqlDbType.NVarChar, 50).Value = loginID;
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
conn.Open();
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
using (SqlDataReader objReader = objCommand.ExecuteReader(CommandBehavior.CloseConnection))
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
if (objReader.Read())
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
student.LoginId = Convert.ToString(objReader["LoginId"]);
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
student.StudentNO = Convert.ToString(objReader["StudentNO"]);
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
student.StudentName = Convert.ToString(objReader["StudentName"]);
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
student.Phone = Convert.ToString(objReader["Phone"]);
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
conn.Close();
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
conn.Dispose();
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
return student;
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
#endregion
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
StudentService
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Collections.Generic;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Text;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Configuration;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Data;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Data.OleDb;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using MySchoolModels; //引用实体类
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using MySchoolIDAL; //引用抽象访问接口
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
/**//* ******************************
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
* 接口名:StudentService
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
* 功能描叙:提供学员信息数据访问
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
* *****************************/
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
namespace MySchoolDAL.Access
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public class StudentService : IStudentService
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
Private Members#region Private Members
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
// 从配置文件中读取数据库连接字符串
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
string sql = string.Empty;
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
string connectionString = "Provider=Microsoft.Jet.OLEDB.4.0; Data Source=MySchool.mdb";
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
#endregion
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
Public Methods#region Public Methods
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
/**//// <summary>
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
/// 根据登录ID 得到学员实体
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
/// </summary>
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
/// <param name="loginID">登录ID</param>
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
/// <returns>学员信息实体</returns>
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public Student GetStudentByLoginID(string loginID)
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
Student student = new Student();
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
sql = "select * from Student where LoginId='" + loginID + "'";
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
using (OleDbConnection conn = new OleDbConnection(connectionString))
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
OleDbCommand objCommand = new OleDbCommand(sql,conn);
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
objCommand.CommandType = CommandType.Text;
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
conn.Open();
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
using (OleDbDataReader objReader = objCommand.ExecuteReader(CommandBehavior.CloseConnection))
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
if (objReader.Read())
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
student.LoginId = Convert.ToString(objReader["LoginId"]);
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
student.StudentNO = Convert.ToString(objReader["StudentNO"]);
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
student.StudentName = Convert.ToString(objReader["StudentName"]);
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
student.Phone = Convert.ToString(objReader["Phone"]);
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
conn.Close();
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
conn.Dispose();
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
return student;
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
#endregion
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
}
实现数据访问对象创建功能
在抽象工厂(MySchoolDALFactory)项目中的3个类:
1> 抽象工厂类 AbstractDALFactory:用于提供数据访问对象创建功能;
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
AbstractDALFactory
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Collections.Generic;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Text;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Configuration;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using MySchoolIDAL; //引用数据访问接口
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
/**//* ******************************
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
* 接口名:AbstractDALFactory
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
* 功能描叙:提供数据抽象工厂
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
* *****************************/
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
namespace MySchoolDALFactory
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public abstract class AbstractDALFactory
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
// 创建工厂的选择应该用反射实现
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
// 这里为了方便理解,使用开关语句实现
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public static AbstractDALFactory ChooseFactory()
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
string dbType = ConfigurationSettings.AppSettings["DBType"].ToString();
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
AbstractDALFactory factory = null;
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
switch(dbType)
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
case "Sql":
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
factory = new SqlDAlFactory();
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
break;
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
case "Access":
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
factory = new AccessDALFactory();
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
break;
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
return factory;
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
// 提供数据访问对象创建功能(抽象工厂提供抽象产品)
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public abstract IStudentService CreateStudentService();
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public abstract IAdminService CreateAdminService();
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
}
2> SQL Server 实体工厂类 SqlDAlFactory:用于封装SQL Server数据库访问对象的创建;
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
SqlDAlFactory
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Collections.Generic;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Text;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using MySchoolIDAL; //引用数据访问接口
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using MySchoolDAL.SqlServer; //引用数据访问 SqlServer
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
/**//* ******************************
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
* 接口名:MySchoolDALFactory
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
* 功能描叙:提供 Sql Server 工厂对象
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
* *****************************/
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
namespace MySchoolDALFactory
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public class SqlDAlFactory: AbstractDALFactory
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
Public Methods#region Public Methods
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public override IStudentService CreateStudentService()
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
return new StudentService();
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public override IAdminService CreateAdminService()
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
return new AdminService();
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
#endregion
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
}
3> Access实体工厂类 AccessDALFactory:用于封装Access数据库访问对象的创建;
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
AccessDALFactory
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Collections.Generic;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Text;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using MySchoolIDAL; //引用数据访问接口
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using MySchoolDAL.Access; //引用数据访问 Access
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
/**//* ******************************
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
* 接口名:AccessDALFactory
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
* 功能描叙:提供 Access 工厂对象
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
* *****************************/
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
namespace MySchoolDALFactory
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public class AccessDALFactory : AbstractDALFactory
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
Public Methods#region Public Methods
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public override IStudentService CreateStudentService()
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
return new StudentService();
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public override IAdminService CreateAdminService()
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
return new AdminService();
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
#endregion
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
}
业务逻辑层调用数据访问层方法
这里用静态类实现业务逻辑层,当业务逻辑层使用静态类实现后,表示层可以直接调用业务逻辑层的方法,无需实例化对象。
示例用户登录业务逻辑代码
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Collections;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Collections.Generic;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Text;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using MySchoolModels;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using MySchoolIDAL;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using MySchoolDALFactory;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
/**//******************************************
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
* 功能:LoginManager
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
* 功能描述:提供用户登录
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
******************************************/
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
namespace MySchoolBLL
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public static class LoginManager
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
private Members#region private Members
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//调用数据访问层统一数据访问方式
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
private static AbstractDALFactory factory =
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
AbstractDALFactory.ChooseFactory();
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
private static IStudentService studentService =
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
factory.CreateStudentService();
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
private static IAdminService adminService =
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
factory.CreateAdminService();
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
#endregion
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
public Methods#region public Methods
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
/**//// <summary>
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
/// 登录
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
/// <summary>
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
/// <param name="loginID">登录 ID</param>
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
/// <param name="password">密码</param>
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
/// <param name="type">用户类型</param>
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
/// <returns></returns>
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public static bool Login(string loginID,string password,string type)
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
bool condition = false;
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
switch(type)
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
case "管理员":
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
condition = AdminLogin(loginID, password);
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
break;
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
case "学员":
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
condition = StudentLogin(loginID, password);
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
break;
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
return condition;
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
#endregion
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
private Methods#region private Methods
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
/**//// <summary>
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
/// 管理员登录
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
/// <summary>
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
/// <param name="loginID">登录 ID</param>
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
/// <param name="password">密码</param>
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
/// <returns></returns>
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
private static bool AdminLogin(string loginID, string password)
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
bool condition = false;
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
string pwd = adminService.GetAdminByLoginID(loginID).LoginPwd.ToString();
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
if(pwd == password)
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
condition = true;
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
return condition;
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
/**//// <summary>
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
/// 学员登录
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
/// <summary>
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
/// <param name="loginID">登录 ID</param>
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
/// <param name="password">密码</param>
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
/// <returns></returns>
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
private static bool StudentLogin(string loginID, string password)
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
bool condition = false;
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
Student student = new Student();
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
student = studentService.GetStudentByLoginID(loginID);
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
if(student.UserStateId != 0)
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
if(student.LoginPwd == password)
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
condition = true;
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
return condition;
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
#endregion
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
}
实现数据访问接口
操作步骤:
1.搭建数据访问层基本架构:
新增抽象工厂项目(MySchoolDALFactory);
新增抽象产品项目(MySchoolIDAL);
实现项目之间的依赖;
2.实现数据访问接口。
3.实现数据访问对象创建功能。
4.业务逻辑层调用数据访问层方法。
抽象工厂:主要功能是生产抽象产品; 如:生产学员、管理员等抽象产品。
抽象产品:主要功能是提供实体产品访问接口; 如:提供学员、管理员等实体产品数据访问的接口。
实体工厂:主要功能是生产实体产品; 如:SQL Server和Access形式的学员、管理员等数据访问对象。
实体产品:主要功能是实现自己的功能; 如:分别实现不同的数据库访问。
对 MySchoolPro(项目)的数据访问层用抽象工厂设计模式进行改造,如下图所示:
抽象工厂(Abstract Factory)设计模式的使用思路概括如下:
提供一系列相互依赖对象的创建;
封装对象的常规创建方法(new);
提供统一调用数据访问方法的方式;
避免调用数据访问方法和具体对象创建工作的紧偶合。
抽象工厂(Abstract Factory)设计模式的概念:
提供一个创建一系列相关或相互依赖对象的接口,而无需指定它们具体的类。
抽象工厂(Abstract Factory)设计模式的使用场合:
一个系统要独立于它产品的创建、组合和表示时。
一个系统要由多个产品系列中的一个来配置时。
[b]MySchoolPro(项目)应用示例
[/b]
用抽象工厂设计模式实现的数据访问层
抽象工厂设计模式与项目中使用的类、接口的对应关系
项目间的依赖关系
项目MySchoolIDAL:提供信息数据访问接口
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
IStudentService
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Collections.Generic;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Text;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Data;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Data.SqlClient;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using MySchoolModels; //引用实体类
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
/**//* ******************************
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
* 接口名:IStudentService
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
* 功能描叙:提供学员信息数据访问接口
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
* *****************************/
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
namespace MySchoolIDAL
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public interface IStudentService
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
Student GetStudentByLoginID(string loginId);
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
IAdminService
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Collections.Generic;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Text;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Data;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Data.SqlClient;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using MySchoolModels; //引用实体类
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
/**//* ******************************
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
* 接口名:IAdminService
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
* 功能描叙:提供管理员信息数据访问接口
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
* *****************************/
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
namespace MySchoolIDAL
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public interface IAdminService
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
Admin GetAdminByLoginID(string loginId);
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
}
项目MySchoolDAL:提供信息数据访问
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
StudentService
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Collections.Generic;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Text;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Configuration;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Data;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Data.SqlClient;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using MySchoolModels; //引用实体类
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using MySchoolIDAL; //引用抽象访问接口
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
/**//* ******************************
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
* 接口名:StudentService
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
* 功能描叙:提供学员信息数据访问
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
* *****************************/
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
namespace MySchoolDAL.SqlServer
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public class StudentService: IStudentService
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
Private Members#region Private Members
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
// 从配置文件中读取数据库连接字符串
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
private readonly string connString =
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
ConfigurationSettings.AppSettings["MySchoolConnectionString"].ToString();
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
private readonly string dboOwner =
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
ConfigurationSettings.AppSettings["DataBaseOwner"].ToString();
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
#endregion
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
Public Methods#region Public Methods
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
/**//// <summary>
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
/// 根据登录ID 得到学员实体
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
/// </summary>
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
/// <param name="loginID">登录ID</param>
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
/// <returns>学员信息实体</returns>
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public Student GetStudentByLoginID(string loginID)
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
Student student = new Student();
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
using (SqlConnection conn = new SqlConnection(connString))
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
SqlCommand objCommand = new SqlCommand(dboOwner + ".usp_SelectStudentInfoByLoginID",conn);
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
objCommand.Parameters.Add("@LoginID", SqlDbType.NVarChar, 50).Value = loginID;
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
conn.Open();
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
using (SqlDataReader objReader = objCommand.ExecuteReader(CommandBehavior.CloseConnection))
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
if (objReader.Read())
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
student.LoginId = Convert.ToString(objReader["LoginId"]);
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
student.StudentNO = Convert.ToString(objReader["StudentNO"]);
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
student.StudentName = Convert.ToString(objReader["StudentName"]);
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
student.Phone = Convert.ToString(objReader["Phone"]);
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
conn.Close();
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
conn.Dispose();
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
return student;
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
#endregion
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
StudentService
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Collections.Generic;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Text;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Configuration;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Data;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Data.OleDb;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using MySchoolModels; //引用实体类
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using MySchoolIDAL; //引用抽象访问接口
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
/**//* ******************************
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
* 接口名:StudentService
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
* 功能描叙:提供学员信息数据访问
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
* *****************************/
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
namespace MySchoolDAL.Access
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public class StudentService : IStudentService
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
Private Members#region Private Members
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
// 从配置文件中读取数据库连接字符串
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
string sql = string.Empty;
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
string connectionString = "Provider=Microsoft.Jet.OLEDB.4.0; Data Source=MySchool.mdb";
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
#endregion
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
Public Methods#region Public Methods
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
/**//// <summary>
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
/// 根据登录ID 得到学员实体
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
/// </summary>
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
/// <param name="loginID">登录ID</param>
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
/// <returns>学员信息实体</returns>
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public Student GetStudentByLoginID(string loginID)
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
Student student = new Student();
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
sql = "select * from Student where LoginId='" + loginID + "'";
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
using (OleDbConnection conn = new OleDbConnection(connectionString))
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
OleDbCommand objCommand = new OleDbCommand(sql,conn);
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
objCommand.CommandType = CommandType.Text;
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
conn.Open();
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
using (OleDbDataReader objReader = objCommand.ExecuteReader(CommandBehavior.CloseConnection))
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
if (objReader.Read())
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
student.LoginId = Convert.ToString(objReader["LoginId"]);
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
student.StudentNO = Convert.ToString(objReader["StudentNO"]);
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
student.StudentName = Convert.ToString(objReader["StudentName"]);
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
student.Phone = Convert.ToString(objReader["Phone"]);
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
conn.Close();
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
conn.Dispose();
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
return student;
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
#endregion
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
}
实现数据访问对象创建功能
在抽象工厂(MySchoolDALFactory)项目中的3个类:
1> 抽象工厂类 AbstractDALFactory:用于提供数据访问对象创建功能;
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
AbstractDALFactory
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Collections.Generic;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Text;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Configuration;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using MySchoolIDAL; //引用数据访问接口
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
/**//* ******************************
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
* 接口名:AbstractDALFactory
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
* 功能描叙:提供数据抽象工厂
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
* *****************************/
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
namespace MySchoolDALFactory
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public abstract class AbstractDALFactory
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
// 创建工厂的选择应该用反射实现
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
// 这里为了方便理解,使用开关语句实现
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public static AbstractDALFactory ChooseFactory()
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
string dbType = ConfigurationSettings.AppSettings["DBType"].ToString();
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
AbstractDALFactory factory = null;
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
switch(dbType)
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
case "Sql":
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
factory = new SqlDAlFactory();
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
break;
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
case "Access":
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
factory = new AccessDALFactory();
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
break;
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
return factory;
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
// 提供数据访问对象创建功能(抽象工厂提供抽象产品)
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public abstract IStudentService CreateStudentService();
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public abstract IAdminService CreateAdminService();
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
}
2> SQL Server 实体工厂类 SqlDAlFactory:用于封装SQL Server数据库访问对象的创建;
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
SqlDAlFactory
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Collections.Generic;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Text;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using MySchoolIDAL; //引用数据访问接口
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using MySchoolDAL.SqlServer; //引用数据访问 SqlServer
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
/**//* ******************************
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
* 接口名:MySchoolDALFactory
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
* 功能描叙:提供 Sql Server 工厂对象
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* *****************************/
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namespace MySchoolDALFactory
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{
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public class SqlDAlFactory: AbstractDALFactory
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{
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Public Methods#region Public Methods
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public override IStudentService CreateStudentService()
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{
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return new StudentService();
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}
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public override IAdminService CreateAdminService()
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{
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return new AdminService();
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}
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#endregion
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}
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}
3> Access实体工厂类 AccessDALFactory:用于封装Access数据库访问对象的创建;
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AccessDALFactory
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using System;
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using System.Collections.Generic;
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using System.Text;
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using MySchoolIDAL; //引用数据访问接口
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using MySchoolDAL.Access; //引用数据访问 Access
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/**//* ******************************
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* 接口名:AccessDALFactory
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* 功能描叙:提供 Access 工厂对象
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* *****************************/
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namespace MySchoolDALFactory
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{
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public class AccessDALFactory : AbstractDALFactory
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{
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Public Methods#region Public Methods
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public override IStudentService CreateStudentService()
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{
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return new StudentService();
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}
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public override IAdminService CreateAdminService()
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{
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return new AdminService();
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}
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#endregion
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}
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}
业务逻辑层调用数据访问层方法
这里用静态类实现业务逻辑层,当业务逻辑层使用静态类实现后,表示层可以直接调用业务逻辑层的方法,无需实例化对象。
示例用户登录业务逻辑代码
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using System;
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using System.Collections;
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using System.Collections.Generic;
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using System.Text;
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using MySchoolModels;
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using MySchoolIDAL;
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using MySchoolDALFactory;
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/**//******************************************
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* 功能:LoginManager
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* 功能描述:提供用户登录
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******************************************/
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namespace MySchoolBLL
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{
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public static class LoginManager
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{
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private Members#region private Members
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//调用数据访问层统一数据访问方式
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private static AbstractDALFactory factory =
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AbstractDALFactory.ChooseFactory();
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private static IStudentService studentService =
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factory.CreateStudentService();
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private static IAdminService adminService =
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factory.CreateAdminService();
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#endregion
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public Methods#region public Methods
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/**//// <summary>
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/// 登录
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/// <summary>
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/// <param name="loginID">登录 ID</param>
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/// <param name="password">密码</param>
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/// <param name="type">用户类型</param>
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/// <returns></returns>
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public static bool Login(string loginID,string password,string type)
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{
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bool condition = false;
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switch(type)
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{
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case "管理员":
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condition = AdminLogin(loginID, password);
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break;
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case "学员":
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condition = StudentLogin(loginID, password);
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break;
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}
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return condition;
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}
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#endregion
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private Methods#region private Methods
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/**//// <summary>
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/// 管理员登录
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/// <summary>
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/// <param name="loginID">登录 ID</param>
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/// <param name="password">密码</param>
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/// <returns></returns>
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private static bool AdminLogin(string loginID, string password)
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{
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bool condition = false;
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string pwd = adminService.GetAdminByLoginID(loginID).LoginPwd.ToString();
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if(pwd == password)
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condition = true;
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return condition;
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}
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/**//// <summary>
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/// 学员登录
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/// <summary>
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/// <param name="loginID">登录 ID</param>
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/// <param name="password">密码</param>
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/// <returns></returns>
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private static bool StudentLogin(string loginID, string password)
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{
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bool condition = false;
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Student student = new Student();
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student = studentService.GetStudentByLoginID(loginID);
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if(student.UserStateId != 0)
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{
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if(student.LoginPwd == password)
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condition = true;
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}
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return condition;
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}
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#endregion
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}
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}
实现数据访问接口
操作步骤:
1.搭建数据访问层基本架构:
新增抽象工厂项目(MySchoolDALFactory);
新增抽象产品项目(MySchoolIDAL);
实现项目之间的依赖;
2.实现数据访问接口。
3.实现数据访问对象创建功能。
4.业务逻辑层调用数据访问层方法。
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