demployee.cs

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			        {
			            condition += " and Employee_Name=@Employee_Name_C";
			            cmd.Parameters.Add(new SqlParameter("@Employee_Name_C",searcher.EmployeeName));
					}
		            if(searcher.IsValidIsValid)
			        {
			            condition += " and Is_Valid=@Is_Valid_C";
			            cmd.Parameters.Add(new SqlParameter("@Is_Valid_C",searcher.IsValid));
					}
		            if(searcher.DepartmentIDIsValid)
			        {
			            condition += " and Department_ID=@Department_ID_C";
			            cmd.Parameters.Add(new SqlParameter("@Department_ID_C",searcher.DepartmentID));
					}
					if(condition != string.Empty)
					{
						condition=" where"+condition.Substring(4);
					}
				    cmd.CommandText="update Employee set "+updateString.Substring(1)+condition;
                    result=cmd.ExecuteNonQuery();
                }
			}
			return result;
		}
		/// <summary>
        /// 根据查询对象构建过滤条件并使用事务的更新方法
        /// </summary>
		/// <param name="connection">实现共享Command的对象</param>
        /// <param name="searcher">查询对象</param>
		/// <param name="newValues">要更新的新值</param>
        /// <returns>影响的记录行数</returns>
	    public int Update(IConnection connection,EmployeeSearcher searcher,EmployeeSearcher newValues)
		{
		    string updateString = string.Empty;
		    string condition = string.Empty;
			SqlCommand cmd=connection.Command as SqlCommand;
			cmd.Parameters.Clear();
		    if(newValues.EmployeeIDIsValid)
			{
			    updateString += ",Employee_ID=@Employee_ID_V";
			    cmd.Parameters.Add(new SqlParameter("@Employee_ID_V",newValues.EmployeeID));
            }
		    if(newValues.EmployeeNameIsValid)
			{
			    updateString += ",Employee_Name=@Employee_Name_V";
			    cmd.Parameters.Add(new SqlParameter("@Employee_Name_V",newValues.EmployeeName));
            }
		    if(newValues.IsValidIsValid)
			{
			    updateString += ",Is_Valid=@Is_Valid_V";
			    cmd.Parameters.Add(new SqlParameter("@Is_Valid_V",newValues.IsValid));
            }
		    if(newValues.DepartmentIDIsValid)
			{
			    updateString += ",Department_ID=@Department_ID_V";
			    cmd.Parameters.Add(new SqlParameter("@Department_ID_V",newValues.DepartmentID));
            }
		    if(searcher.EmployeeIDIsValid)
			{
			    condition += " and Employee_ID=@Employee_ID_C";
			    cmd.Parameters.Add(new SqlParameter("@Employee_ID_C",searcher.EmployeeID));
		    }
		    if(searcher.EmployeeNameIsValid)
			{
			    condition += " and Employee_Name=@Employee_Name_C";
			    cmd.Parameters.Add(new SqlParameter("@Employee_Name_C",searcher.EmployeeName));
		    }
		    if(searcher.IsValidIsValid)
			{
			    condition += " and Is_Valid=@Is_Valid_C";
			    cmd.Parameters.Add(new SqlParameter("@Is_Valid_C",searcher.IsValid));
		    }
		    if(searcher.DepartmentIDIsValid)
			{
			    condition += " and Department_ID=@Department_ID_C";
			    cmd.Parameters.Add(new SqlParameter("@Department_ID_C",searcher.DepartmentID));
		    }
			if(condition != string.Empty)
			{
				condition=" where"+condition.Substring(4);
			}
		    cmd.CommandText="update Employee set "+updateString.Substring(1)+condition;
            return cmd.ExecuteNonQuery();
		}
		#endregion
		
		#region 查询实体集合
		/// <summary>
        /// 根据查询对象构建过滤条件查询
        /// </summary>
        /// <param name="searcher">查询对象</param>
        /// <returns>实体类对象列表</returns>
        public ArrayList Select(EmployeeSearcher searcher)
        {
            ArrayList entities = new ArrayList();
			string connectionString = System.Configuration.ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
			using(SqlConnection conn=new SqlConnection(connectionString))
            {
                conn.Open();
                using (SqlCommand cmd = conn.CreateCommand())
                {
					entities = Select(cmd,searcher);
				}
            }
			return entities;
        }
		/// <summary>
        /// 使用事务并且依据查询对象构建过滤条件查询
        /// </summary>
		/// <param name="connection">实现共享Command的对象</param>
        /// <param name="searcher">查询对象</param>
        /// <returns>实体类对象列表</returns>
        public ArrayList Select(IConnection connection, EmployeeSearcher searcher)
        {
		    SqlCommand cmd=connection.Command as SqlCommand;
            return Select(cmd,searcher);
        }
		public ArrayList Select(SqlCommand command,EmployeeSearcher searcher)
		{
		    string condition=string.Empty;
		    command.Parameters.Clear();
			ArrayList entities = new ArrayList();
		    if(searcher.EmployeeIDIsValid)
			{
			    condition += " and Employee_ID=@Employee_ID_C";
			    command.Parameters.Add(new SqlParameter("@Employee_ID_C",searcher.EmployeeID));
		    }
		    if(searcher.EmployeeNameIsValid)
			{
			    condition += " and Employee_Name=@Employee_Name_C";
			    command.Parameters.Add(new SqlParameter("@Employee_Name_C",searcher.EmployeeName));
		    }
		    if(searcher.IsValidIsValid)
			{
			    condition += " and Is_Valid=@Is_Valid_C";
			    command.Parameters.Add(new SqlParameter("@Is_Valid_C",searcher.IsValid));
		    }
		    if(searcher.DepartmentIDIsValid)
			{
			    condition += " and Department_ID=@Department_ID_C";
			    command.Parameters.Add(new SqlParameter("@Department_ID_C",searcher.DepartmentID));
		    }
			if(condition != string.Empty)
			{
				condition=" where"+condition.Substring(4);
			}
			
            command.CommandText = "select * from Employee"+condition;
            return ExcuteSelectCommand(command);
		}
		/// <summary>
        /// 执行Command获取对象列表
        /// </summary>
        /// <param name="cmd">Command对象</param>
        /// <returns>实体类对象列表</returns>
        private ArrayList ExcuteSelectCommand(SqlCommand cmd)
        {
            ArrayList entities = new ArrayList();
            using (SqlDataReader dr = cmd.ExecuteReader())
            {
                while (dr.Read())
                {
                    Employee  entity = DataReaderToEntity(dr);
                    entities.Add(entity);
                }
            }
			SetForeignKeyEntity(cmd, ref entities);
			return entities;
        }
		private void SetForeignKeyEntity(SqlCommand command, ref ArrayList entities)
		{
		    //由外键获取相关实体
			DDepartment dDepartment=new DDepartment();
			foreach(Employee  entity in entities)
			{
	            entity.Department = dDepartment.SelectSingle(command,entity.DepartmentID);
			}
		}
        /// <summary>
        /// 查询所有实体
        /// </summary>
        /// <returns>实体类对象列表</returns>
        public ArrayList Select()
        {
            ArrayList entities = new ArrayList();
			string connectionString = System.Configuration.ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
			using(SqlConnection conn=new SqlConnection(connectionString))
            {
                conn.Open();
                using (SqlCommand cmd = conn.CreateCommand())
                {
                    cmd.CommandText = "select * from Employee";
                    entities=ExcuteSelectCommand(cmd);
                }
                return entities;
            }
        }
		/// <summary>
        /// 使用事务查询查询所有实体
        /// </summary>
		/// <param name="connection">实现共享Command的对象</param>
        /// <param name="searcher">查询对象</param>
        /// <returns>实体类对象列表</returns>
        public ArrayList Select(IConnection connection)
        {
            ArrayList entities = new ArrayList();
            SqlCommand cmd=connection.Command as SqlCommand;
			cmd.Parameters.Clear();
            cmd.CommandText = "select * from Employee";
            return ExcuteSelectCommand(cmd);
        }
		#endregion
		
		#region 查询单个实体
		/// <summary>
        /// 按主键字段查询特定实体
        /// </summary>
        /// <param name="pkValue">主键值</param>
        /// <returns>实体类对象</returns>
        public Employee SelectSingle(object pkValue)
        {
		    Employee entity=null;
			string connectionString = System.Configuration.ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
			using(SqlConnection conn=new SqlConnection(connectionString))
            {
                conn.Open();
                using (SqlCommand cmd = conn.CreateCommand())
                {
                    entity=SelectSingle(cmd,pkValue);
                }   
            } 
			return entity;
        }
		
		/// <summary>
        /// 使用事务并按主键字段查询特定实体
        /// </summary>
        /// <param name="pkValue">主键值</param>
        /// <returns>实体类对象</returns>
        public Employee SelectSingle(IConnection connection,object pkValue)
        {
		    SqlCommand cmd=connection.Command as SqlCommand;
			return SelectSingle(cmd,pkValue);
            
        }
		public Employee SelectSingle(SqlCommand command,object pkValue)
		{
		    Employee entity=null;
		    command.Parameters.Clear();
		    command.CommandText = "select * from Employee where Employee_ID=@pk";
			command.Parameters.Add(new SqlParameter("@pk",pkValue));
			using (SqlDataReader dr = command.ExecuteReader())
            {
			    if(dr.Read())
				    entity = DataReaderToEntity(dr);
			}
						
			//由外键获取相关实体
			DDepartment dDepartment=new DDepartment();
	        entity.Department = dDepartment.SelectSingle(command,entity.DepartmentID);
            return entity;
		}
		#endregion
		
				
		/// <summary>
        /// 从DataReader中取出值生成实体对象
        /// </summary>
        /// <param name="searcher">查询对象</param>
        /// <returns>过滤条件字符串</returns>
		private Employee DataReaderToEntity(SqlDataReader dr)
		{
		    Employee entity = new Employee ();
			if(dr["Employee_ID"]!=System.DBNull.Value)
			{
			    entity.EmployeeID=Convert.ToInt32(dr["Employee_ID"]);
			}
			if(dr["Employee_Name"]!=System.DBNull.Value)
			{
			    entity.EmployeeName=dr["Employee_Name"].ToString();
			}
			if(dr["Is_Valid"]!=System.DBNull.Value)
			{
			    entity.IsValid=Convert.ToBoolean(dr["Is_Valid"]);
			}
			if(dr["Department_ID"]!=System.DBNull.Value)
			{
			    entity.DepartmentID=Convert.ToInt32(dr["Department_ID"]);
			}
			return entity;
		}
	}
}