用C#实现的数据库抽象工厂(一)
用C#实现的数据库抽象工厂(一)
发表：2004-6-4 18:00:52 出处：你的博客网(yourblog.org)
http://www.csdn.net/develop/article/26/26098.shtm最近学习了一下设计模式，便尝试用C#对数据库的访问操作采用抽象工厂的模式实现一下，其中与标准的模式略有不同，加入了一些自己的想法，希望大家批评指正，代码共分为6个类：
(1)AbstractDbFactory.cs
using System;
using System.Data;
namespace DbService
{
/// <summary>
/// 数据库抽象工厂接口
/// </summary>
public interface AbstractDbFactory
{
/// <summary>
/// 建立默认连接
/// </summary>
/// <returns>数据库连接</returns>
IDbConnection CreateConnection();
/// <summary>
/// 根据连接字符串建立Connection对象
/// </summary>
/// <param name="strConn">连接字符串</param>
/// <returns>Connection对象</returns>
IDbConnection CreateConnection(string strConn);
/// <summary>
/// 建立Command对象
/// </summary>
/// <returns>Command对象</returns>
IDbCommand CreateCommand();
/// <summary>
/// 建立DataAdapter对象
/// </summary>
/// <returns>DataAdapter对象</returns>
IDbDataAdapter CreateDataAdapter();
/// <summary>
/// 根据Connection建立Transaction
/// </summary>
/// <param name="myDbConnection">Connection对象</param>
/// <returns>Transaction对象</returns>
IDbTransaction CreateTransaction(IDbConnection myDbConnection);
/// <summary>
/// 根据Command建立DataReader
/// </summary>
/// <param name="myDbCommand">Command对象</param>
/// <returns>DataReader对象</returns>
IDataReader CreateDataReader(IDbCommand myDbCommand);
/// <summary>
/// 获得连接字符串
/// </summary>
/// <returns>连接字符串</returns>
string GetConnectionString();
}
}
(2)Factory.cs
using System;
using System.Configuration;
namespace DbService
{
/// <summary>
/// Factory类
/// </summary>
public sealed class Factory
{
private static volatile Factory singleFactory = null;
private static object syncObj = new object();
/// <summary>
/// Factory类构造函数
/// </summary>
private Factory()
{
}
/// <summary>
/// 获得Factory类的实例
/// </summary>
/// <returns>Factory类实例</returns>
public static Factory GetInstance()
{
if(singleFactory == null)
{
lock(syncObj)
{
if(singleFactory == null)
{
singleFactory = new Factory();
}
}
}
return singleFactory;
}
/// <summary>
/// 建立Factory类实例
/// </summary>
/// <returns>Factory类实例</returns>
public AbstractDbFactory CreateInstance()
{
AbstractDbFactory abstractDbFactory = null;
switch(ConfigurationSettings.AppSettings["DatabaseType"].ToLower())
{
case "sqlserver":
{
abstractDbFactory = new SqlFactory();
break;
}
case "oledb":
{
abstractDbFactory = new OleDbFactory();
break;
}
case "odbc":
{
abstractDbFactory = new OdbcFactory();
break;
}
}
return abstractDbFactory;
}
}
}
(3)SqlFactory.cs
using System;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
namespace DbService
{
/// <summary>
/// 针对SqlServer专用连接的工厂
/// </summary>
public class SqlFactory : AbstractDbFactory
{
/// <summary>
/// 构造函数
/// </summary>
public SqlFactory()
{
}
/// <summary>
/// 建立默认Connection对象
/// </summary>
/// <returns>Connection对象</returns>
public IDbConnection CreateConnection()
{
return new SqlConnection();
}
/// <summary>
/// 根据连接字符串建立Connection对象
/// </summary>
/// <param name="strConn">连接字符串</param>
/// <returns>Connection对象</returns>
public IDbConnection CreateConnection(string strConn)
{
return new SqlConnection(strConn);
}
/// <summary>
/// 建立Command对象
/// </summary>
/// <returns>Command对象</returns>
public IDbCommand CreateCommand()
{
return new SqlCommand();
}
/// <summary>
/// 建立DataAdapter对象
/// </summary>
/// <returns>DataAdapter对象</returns>
public IDbDataAdapter CreateDataAdapter()
{
return new SqlDataAdapter();
}
/// <summary>
/// 根据Connection建立Transaction
/// </summary>
/// <param name="myDbConnection">Connection对象</param>
/// <returns>Transaction对象</returns>
public IDbTransaction CreateTransaction(IDbConnection myDbConnection)
{
return myDbConnection.BeginTransaction();
}
/// <summary>
/// 根据Command建立DataReader
/// </summary>
/// <param name="myDbCommand">Command对象</param>
/// <returns>DataReader对象</returns>
public IDataReader CreateDataReader(IDbCommand myDbCommand)
{
return myDbCommand.ExecuteReader();
}
/// <summary>
/// 获得连接字符串
/// </summary>
/// <returns>连接字符串</returns>
public string GetConnectionString()
{
string strServer = ConfigurationSettings.AppSettings["SqlServerServer"];
string strDatabase = ConfigurationSettings.AppSettings["SqlServerDatabase"];
string strUid = ConfigurationSettings.AppSettings["SqlServerUid"];
string strPwd = ConfigurationSettings.AppSettings["SqlServerPwd"];
string strConnectionString = "Server = " + strServer + "; Database = " + strDatabase + "; Uid = " + strUid + "; Pwd = " + strPwd + ";";
return strConnectionString;
}
}
}
(4)OleDbFactory.cs
using System;
using System.Data;
using System.Data.OleDb;
using System.Configuration;
namespace DbService
{
/// <summary>
/// 针对OleDb连接的工厂
/// </summary>
public class OleDbFactory : AbstractDbFactory
{
/// <summary>
/// 构造函数
/// </summary>
public OleDbFactory()
{
}
/// <summary>
/// 建立默认Connection对象
/// </summary>
/// <returns>Connection对象</returns>
public IDbConnection CreateConnection()
{
return new OleDbConnection();
}
/// <summary>
/// 根据连接字符串建立Connection对象
/// </summary>
/// <param name="strConn">连接字符串</param>
/// <returns>Connection对象</returns>
public IDbConnection CreateConnection(string strConn)
{
return new OleDbConnection(strConn);
}
/// <summary>
/// 建立Command对象
/// </summary>
/// <returns>Command对象</returns>
public IDbCommand CreateCommand()
{
return new OleDbCommand();
}
/// <summary>
/// 建立DataAdapter对象
/// </summary>
/// <returns>DataAdapter对象</returns>
public IDbDataAdapter CreateDataAdapter()
{
return new OleDbDataAdapter();
}
/// <summary>
/// 根据Connection建立Transaction
/// </summary>
/// <param name="myDbConnection">Connection对象</param>
/// <returns>Transaction对象</returns>
public IDbTransaction CreateTransaction(IDbConnection myDbConnection)
{
return myDbConnection.BeginTransaction();
}
/// <summary>
/// 根据Command建立DataReader
/// </summary>
/// <param name="myDbCommand">Command对象</param>
/// <returns>DataReader对象</returns>
public IDataReader CreateDataReader(IDbCommand myDbCommand)
{
return myDbCommand.ExecuteReader();
}
/// <summary>
/// 获得连接字符串
/// </summary>
/// <returns>连接字符串</returns>
public string GetConnectionString()
{
string strProvider = ConfigurationSettings.AppSettings["OleDbProvider"];
string strDataSource = ConfigurationSettings.AppSettings["OleDbDataSource"];
string strConnectionString = "Provider = " + strProvider + ";Data Source = " + strDataSource + ";";
return strConnectionString;
}
}
}
(5)OdbcFactory.cs
using System;
using System.Data;
using System.Data.Odbc;
using System.Configuration;
namespace DbService
{
/// <summary>
/// 针对Odbc连接的工厂
/// </summary>
public class OdbcFactory : AbstractDbFactory
{
/// <summary>
/// 构造函数
/// </summary>
public OdbcFactory()
{
}
/// <summary>
/// 建立默认Connection对象
/// </summary>
/// <returns>Connection对象</returns>
public IDbConnection CreateConnection()
{
return new OdbcConnection();
}
/// <summary>
/// 根据连接字符串建立Connection对象
/// </summary>
/// <param name="strConn">连接字符串</param>
/// <returns>Connection对象</returns>
public IDbConnection CreateConnection(string strConn)
{
return new OdbcConnection(strConn);
}
/// <summary>
/// 建立Command对象
/// </summary>
/// <returns>Command对象</returns>
public IDbCommand CreateCommand()
{
return new OdbcCommand();
}
/// <summary>
/// 建立DataAdapter对象
/// </summary>
/// <returns>DataAdapter对象</returns>
public IDbDataAdapter CreateDataAdapter()
{
return new OdbcDataAdapter();
}
/// <summary>
/// 根据Connection建立Transaction
/// </summary>
/// <param name="myDbConnection">Connection对象</param>
/// <returns>Transaction对象</returns>
public IDbTransaction CreateTransaction(IDbConnection myDbConnection)
{
return myDbConnection.BeginTransaction();
}
/// <summary>
/// 根据Command建立DataReader
/// </summary>
/// <param name="myDbCommand">Command对象</param>
/// <returns>DataReader对象</returns>
public IDataReader CreateDataReader(IDbCommand myDbCommand)
{
return myDbCommand.ExecuteReader();
}
/// <summary>
/// 获得连接字符串
/// </summary>
/// <returns></returns>
public string GetConnectionString()
{
string strDriver = ConfigurationSettings.AppSettings["OdbcDriver"];
string strDBQ = ConfigurationSettings.AppSettings["OdbcDBQ"];
string strConnectionString = "Driver={" + strDriver + "}; DBQ=" + strDBQ + ";";
return strConnectionString;
}
}
}
