select count(*) from table where....
我想在题目中的sql语句执行完之后,取出count值,赋给一个整型变量,然后再确定后面的操作。请问怎么把它赋给一个int变量???? 
 我采用的方法是: 
 string   str= "select   count(*)   from   table "; 
 int   countNum   =Dboperate.exeCommand(str); 
 注:Dboperate是我自己写的一个执行sql语句的类。 
 请大家帮帮忙。谢谢。
------解决方案--------------------int num; 
         string str =  "select count(*) from table "; 
         SqlCommand sComm = new SqlCommand(str,conn_string); 
         num = (int)sComm.ExecuteScalar();
------解决方案--------------------int num; 
         string str =  "select count(*) from table "; 
         SqlCommand sComm = new SqlCommand(str,conn_string); 
         num = Convert.ToInt32(sComm.ExecuteScalar());
------解决方案--------------------????   
 可以这样写:   
 SqlCnn表示连接:   
 string str= "select count(*) from table ";   
 OleDbDataAdapter OleAdp = new OleDbDataAdapter (str,SqlCnn); 
 DataSet DSet = new DataSet();   
 OleAdp.fill(DSet);   
 foreach(DataRow DRow in DSet.Table[0].Rows) 
 { 
   countNum =Convert.ToInt32(DRow.ItemArray[0].ToString); 
 }   
 这样写,因为查询结果就只有一条;可以这样获取你要的东东!~~   
------解决方案--------------------num = 0;   
  string str= "select count(*) from table ";  
  cmd =new sqlCommand(str,connectionString); 
  SqlDataReader reader = cmd.ExecuteReader();    
  if(!reader.Equals(null)) 
  { 
    if(reader.HasRows) 
      num = reader.GetDecimal(0); 
  }    
------解决方案--------------------		public static object ExecuteScalar(SqlParameter[] Parms, string SqlText, CommandType CmdType) 
 		{ 
 			using (SqlConnection Conn = new SqlConnection(strConn)) 
 			{ 
 				SqlCommand Cmd = new SqlCommand(); 
 				PrepareCommand(Conn, Parms, SqlText, Cmd, CmdType); 
 				object obj = Cmd.ExecuteScalar(); 
 				Cmd.Parameters.Clear(); 
 				Cmd.Dispose(); 
 				if((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value))) 
 				{					 
 					return null; 
 				} 
 				else 
 				{ 
 					return obj; 
 				} 
 			} 
 		}   
 调用这个方法,再进行强类型转换