基于统一插件接口的WEB程序设计[中]
接上回：
在这一次所写的代码是所谓的插件
文件名：User.cs
using System;
using System.Data;
using System.Data.OleDb;
//using clubstar.IPlug;
using clubstar;
namespace clubstar.IPlug.DataOp
{
public struct UserTable //用户表结构变量
{
public int id; //
public int sessionid;
public string name;
public string nickname; //
public string password; //
public bool sex; //
public DateTime birthday; //
public string city; //
public int weight; //
public int height; //
public string education; //
public int bloodtype; //
public string xingzuo;
public bool marry;
public string job; //
public string favorstar; //
public string favordo; //
public string introduce; //
public string email; //
public DateTime joindate; //
public DateTime logindate; //
public int rank; //
public string mobilephone; //
public string pic; //
public string pic_id; //
public int jifen; //
public int renqi; //
public int acceptwho; //
}
/// <summary>
/// User 的摘要说明。
/// </summary>
///
public class User: IPlugStarClub
{
public ConnDB_Op UserTable=ConnDB_Op.Instance(); //调用单体模式进行数据库的连接
protected string SqlString="";
public User()
{
}
public User(string sql)
{
SqlString=sql;
}
#region IPlugStarClub Members
/// <summary>
/// 返回调用插件的名称
/// </summary>
public string Name
{
get
{
//return "User_Plugin:用户表插件";
return "clubstar.IPlug.DataOp.User";
}
}
/// <summary>
///用户表操作
/// </summary>
/// <param name="context"></param>
public OleDbDataReader PerformSelect (IPlugSql sql)
{
//sql.SqlString=SqlString;
return UserTable.ExecuteReader(sql.SqlString);
}
public void PerformDelete (IPlugSql sql)
{
//sql.SqlString=SqlString;
UserTable.ExecuteNonQuery(sql.SqlString);
}
public void PerformInsert (IPlugSql sql)
{
//sql.SqlString=SqlString;
UserTable.ExecuteNonQuery(sql.SqlString);
}
public void PerformUpdate (IPlugSql sql)
{
//sql.SqlString=SqlString;
UserTable.ExecuteNonQuery(sql.SqlString);
}
#endregion
}
}
其中关于数据库连接类的写法如下
文件名：ConnDB_Op.cs
using System;
using System.Data;
using System.Data.SqlClient;
using System.Data.OleDb;
using System.Configuration;
namespace clubstar.IPlug.DataOp
{
/// <summary>
/// ConnDB_Op 的摘要说明。
/// 采用 Facade 外观设计模式以封装所有与数据库相关的操作
/// </summary>
public class ConnDB_Op
{
private OleDbDataAdapter da=new OleDbDataAdapter();
private DataSet ds=new DataSet();
private OleDbCommand cmd=new OleDbCommand();
public OleDbConnection MyConn;
public OleDbDataReader dr;
public string SqlString="";
public string StrConn="Provider=SQLOLEDB;"+ConfigurationSettings.AppSettings["clubstar"];
//数据库连接采用Singleton 模式,只能通过Instance()来创建该类的唯一实例
private static ConnDB_Op conndb_op = null;
public static ConnDB_Op Instance()
{
if (null == conndb_op)
conndb_op = new ConnDB_Op();
return conndb_op;
}
private ConnDB_Op(string strconn,string sqlstring)
{
StrConn=strconn;
SqlString=sqlstring;
}
private ConnDB_Op()
{
}........
如下的文件用于实际处理插件的操作
文件名：PluginSectionHandler.cs
using System;
using System.Xml;
using System.Configuration;
using clubstar.IPlug;
namespace clubstar
{
/// <summary>
/// This class implements IConfigurationSectionHandler and allows
/// us to parse the "plugin" XML nodes found inside App.Config
/// and return a PluginCollection object
/// </summary>
public class PluginSectionHandler:IConfigurationSectionHandler
{
public PluginSectionHandler()
{
}
#region IConfigurationSectionHandler Members
/// <summary>
/// Iterate through all the child nodes
/// of the XMLNode that was passed in and create instances
/// of the specified Types by reading the attribite values of the nodes
/// we use a try/Catch here because some of the nodes
/// might contain an invalid reference to a plugin type
/// </summary>
/// <param name="parent"></param>
/// <param name="configContext"></param>
/// <param name="section">The XML section we will iterate against</param>
/// <returns></returns>
///
public System.Web.HttpResponse dai;
public object Create(object parent, object configContext, System.Xml.XmlNode section)
{
PluginCollection plugins = new PluginCollection();
foreach(XmlNode node in section.ChildNodes)
{
try
{
//Use the Activator class's 'CreateInstance' method
//to try and create an instance of the plugin by
//passing in the type name specified in the attribute value
object plugObject = Activator.CreateInstance(Type.GetType(node.Attributes["type"].Value));//读取WEBCONFIG中的相应配置节
//Cast this to an IPlugin interface and add to the collection
IPlugStarClub plugin = (IPlugStarClub)plugObject;
plugins.Add(plugin);
}
catch
{
//Catch any exceptions
//but continue iterating for more plugins
//dai.Write(section.ChildNodes.Count.ToString());
throw;
}
}
return plugins;
}
#endregion
}
}
而如下文件用于获取插件的名字信息：
文件名：PlugSqlOp.cs
using System;
using clubstar.IPlug;
namespace clubstar
{
/// <summary>
/// UserOp 的摘要说明。
/// </summary>
public class PlugSqlOp:IPlugSql
{
private string m_User="";
public PlugSqlOp(string user)
{
m_User = user;
}
#region PlugSqlOp Members
public string SqlString
{
get
{
return m_User;
}
set
{
m_User = value;
}
}
#endregion
}
}