COM+数据库连接池
连接池
添加以下引用
System.EnterpriseServices
System.Runtime.Remoting
using System;
using System.IO;
using System.Text;
using System.Reflection;
using System.Runtime.InteropServices;
using System.EnterpriseServices;
[assembly: ApplicationName("POOLINGTEST")]
[assembly: AssemblyKeyFile("poolserver.snk")]
namespace PoolServer
{
[ObjectPooling(Enabled=true,MinPoolSize=0, MaxPoolSize=1,CreationTimeout=2000)]
[JustInTimeActivation(true)]
[ConstructionEnabled(Default="Workstation id=.;data source=.;initial catalog=card;integrated security=sspi")] //Text File to be created during construction
public class PooledFile : ServicedComponent
{
private string strConnection;
protected override void Construct(string constructString)
{
strConnection = constructString;
}
public string ConnectionString
{
get
{
return strConnection;
}
}
}
}
远程数据库访问类
添加以下引用
System.EnterpriseServices
System.Runtime.Remoting
添加连接池组件PoolServer.dll
using System;
using PoolServer;
using System.Reflection;
using System.Data;
using System.Data.SqlClient;
namespace RemoteTest
{
//SQL Server数据库连接类
public class SQLConnection:MarshalByRefObject
{
private SqlConnection m_sqlConn;
private SqlDataAdapter m_sqlDA;
private SqlCommand m_sqlComm;
public SQLConnection()
{
PooledFile pool = new PooledFile();
m_sqlConn = new SqlConnection(pool.ConnectionString);
}
//创建一个SQLConnection连接实例
public SQLConnection(string strConnection)
{
Console.WriteLine("有数构造");
m_sqlConn = new SqlConnection(strConnection);
}
//执行查询，返回DataSet对象(多条记录)
public DataSet executeQueryDS(string strQuery,string table)
{
open();
m_sqlDA = new SqlDataAdapter(strQuery, m_sqlConn);
DataSet ds = new DataSet();
m_sqlDA.Fill(ds,table);
close();
return ds;
}
//执行查询，返回SqlDataReader对象(一条记录)
//执行该方法后，必须执行close()方法以关闭SQL Server数据库连接
public SqlDataReader executeQueryDR(string strQuery)
{
open();
m_sqlComm = new SqlCommand(strQuery, m_sqlConn);
SqlDataReader dr;
dr = m_sqlComm.ExecuteReader();
return dr;
}
//执行更新，返回所影响的行数
public int executeUpdate(string strUpdate)
{
open();
m_sqlComm = new SqlCommand(strUpdate, m_sqlConn);
int rows;
rows = m_sqlComm.ExecuteNonQuery();
return rows;
}
public bool isExistProcudure(string sql, SqlParameter[] param)
{
m_sqlComm = new SqlCommand(sql, m_sqlConn);
m_sqlComm.CommandType = CommandType.StoredProcedure;
if (param != null)
{
foreach (SqlParameter parameter in param)
{
m_sqlComm.Parameters.Add(parameter);
}
}
open();
int n = Convert.ToInt32(m_sqlComm.ExecuteScalar());
close();
if (n >= 0)
{
return true;
}
else
{
return false;
}
}
//执行返回查询结果的存储过程
public SqlDataReader executeQueryProcedure(string strCommandText, SqlParameter[] param)
{
open();
m_sqlComm = new SqlCommand(strCommandText, m_sqlConn);
m_sqlComm.CommandType = CommandType.StoredProcedure;
if (param != null)
{
foreach (SqlParameter parameter in param)
{
if(parameter != null)
{
m_sqlComm.Parameters.Add(parameter);
}
}
}
SqlDataReader dr = m_sqlComm.ExecuteReader();
return dr;
}
//执行更新，返回所影响行数的存储过程
public int executeUpdateProcedure(string strCommandText, SqlParameter[] param)
{
open();
m_sqlComm = new SqlCommand(strCommandText, m_sqlConn);
m_sqlComm.CommandType = CommandType.StoredProcedure;
if (param != null)
{
foreach (SqlParameter parameter in param)
{
if(parameter != null)
{
m_sqlComm.Parameters.Add(parameter);
}
}
}
int rows = m_sqlComm.ExecuteNonQuery();
return rows;
}
//打开SQLConnection连接
public void open()
{
if(m_sqlConn.State == ConnectionState.Closed)
{
m_sqlConn.Open();
}
}
//关闭SQLConnection连接
public void close()
{
if(m_sqlConn.State == ConnectionState.Open)
{
m_sqlConn.Close();
}
}
}
}
服务器
添加以下引用System.EnterpriseServices
System.Runtime.Remoting
添加数据库访问类组件RemoteTest.dll
private SQLConnection obj;
private bool m_bSign=true;
private void sign()
{
TcpServerChannel channel = new TcpServerChannel(9932);
obj = new SQLConnection();
ChannelServices.RegisterChannel(channel);
ObjRef objref=RemotingServices.Marshal(obj, "TestLoader", typeof(SQLConnection));
}
private void btn_start_Click(object sender, System.EventArgs e)
{
//RemotingConfiguration.RegisterWellKnownServiceType(typeof(SQLConnection),
// "TestLoader", WellKnownObjectMode.Singleton );
if(m_bSign)
{
m_bSign=false;
this.sign();
}
else
{
ObjRef objrefWellKnown = RemotingServices.Marshal(obj, "TestLoader");
}
this.lb_message.Items.Clear();
this.lb_message.Items.Add("CM+服务器已起动!!!");
this.btn_start.Enabled=false;
this.btn_stop.Enabled=true;
}
private void btn_stop_Click(object sender, System.EventArgs e)
{
this.btn_stop.Enabled=false;
this.btn_start.Enabled=true;
RemotingServices.Disconnect(obj);
//ChannelServices.UnregisterChannel(channel);
this.lb_message.Items.Add("COM+服务器已关闭!!!");
}
private void menuItem_openServer_Click(object sender, System.EventArgs e)
{
if(m_bShowWnd==true)
{
this.Visible=true;
m_bShowWnd=false;
}
}
private void menuItem_minimize_Click(object sender, System.EventArgs e)
{
if(m_bShowWnd==false)
{
this.Visible=false;
m_bShowWnd=true;
}
}
private void menuItem_exit_Click(object sender, System.EventArgs e)
{
DialogResult result=MessageBox.Show("你确定要退出COM+服务器吗?如果单击是,它将终止所有访问数据库的服务.","信息提示",MessageBoxButtons.YesNo,MessageBoxIcon.Question);
if(result==DialogResult.Yes)
{
this.Close();
}
}
private void notifyIcon1_DoubleClick(object sender, System.EventArgs e)
{
m_bShowWnd=false;
this.Visible=true;
}
private void button1_Click(object sender, System.EventArgs e)
{
menuItem_exit_Click(null,null);
}
private void label2_Click(object sender, System.EventArgs e)
{
if(m_bShowWnd==false)
{
this.Visible=false;
m_bShowWnd=true;
}
}
客户端
添加以下引用
System.EnterpriseServices
System.Runtime.Remoting
添加数据库访问类组件RemoteTest.dll
using System;
using System.Runtime.Remoting;
using System.Runtime.Remoting.Channels;
using System.Runtime.Remoting.Channels.Tcp;
using RemoteTest;
using System.Data.SqlClient;
namespace Client
{
public class ClassClient
{
static void Main(string[] args)
{
try
{
ChannelServices.RegisterChannel(new TcpClientChannel());
SQLConnection loader=(SQLConnection)Activator.GetObject(typeof(SQLConnection),"tcp://localhost:9932/TestLoader");
if(loader==null)
{
Console.WriteLine("Unable to get remote");
}
else
{
SqlParameter[] param=new SqlParameter[2];
param[0] = new SqlParameter("@emp_id", SqlDbType.NChar, 9); //存储过程的输入参数
param[0].Value = "PMA42628M";
param[1] = new SqlParameter("@emp_name", SqlDbType.NVarChar, 20); //存储过程的输出参数
param[1].Direction = ParameterDirection.Output;
ESqlParameter[] eparam = new ESqlParameter[2];
eparam[0] = new ESqlParameter(param[0]);
eparam[1] = new ESqlParameter(param[1]);
IFormatter formatter = new BinaryFormatter();
Stream stream = new FileStream("MyFile.txt", FileMode.Create, FileAccess.Write, FileShare.None, 1000, true);
formatter.Serialize(stream, eparam);
//执行根据指定员工编号查询员工名字的存储过程
SqlDataReader dr =loader .executeQueryProcedure("prcGetEmpName", stream);
stream.Close();
stream = null;
GC.Collect();
System.Console.WriteLine("员工编号 : " + param[0].Value);
System.Console.WriteLine("员工名字 : " + param[1].Value);
conn.close();
}
catch(SingletonException err)
{
System.Console.WriteLine(err.Message);
}
catch(Exception err)
{
System.Console.WriteLine(err.ToString());
}
}
[Serializable]
public class ESqlParameter
{
public ESqlParameter(SqlParameter sPara)
{
this.paraName = sPara.ParameterName ;
this.paraLen = sPara.Size ;
this.paraVal = sPara.Value ;
this.sqlDbType= sPara.SqlDbType ;
}
public SqlParameter ToSqlParameter()
{
SqlParameter para = new SqlParameter(this.paraName ,this.sqlDbType ,this.paraLen) ;
para.Value = this.paraVal ;
return para ;
}
private string paraName = "" ;
public string ParaName
{
get
{
return this.paraName ;
}
set
{
this.paraName = value ;
}
}
private int paraLen = 0 ;
public int ParaLen
{
get
{
return this.paraLen ;
}
set
{
this.paraLen = value ;
}
}
private object paraVal = null ;
public object ParaVal
{
get
{
return this.paraVal ;
}
set
{
this.paraVal = value ;
}
}
private SqlDbType sqlDbType = SqlDbType.NVarChar ;
public SqlDbType SqlDbType
{
get
{
return this.sqlDbType ;
}
set
{
this.sqlDbType = value ;
}
}
}
一步：打开管理工具,打开服务,然后把所有关于COM+的服务起动
二步：起动Distributed Transaction Coordinator服务
三步：注册强名称
1.打开.net命令窗口
2.定位COM+所在目标,然后输入 sn -k 强名称
二步：起动服务器
三步：客房端访问