category.cs

实现文本的特征提取

using System;
using System.Data;
using System.Data.SqlClient;

namespace Njnu.DAL
{
	/// <summary>
	/// Category 的摘要说明。
	/// </summary>
	public class Category
	{
		public string GetCateIDByCateName(string name)
		{
			DataTable dt = new DataTable();
			SqlParameter[] parameters = {};
			
			try
			{
				using(SqlDatabase sqlDB = new SqlDatabase("select ID from Category where name = '" + name + "'", parameters))
				{
					sqlDB.Run(dt);
				}
				return dt.Rows[0][0].ToString();
			}
			catch(Exception e)
			{
				throw( new Exception(" 类别 ["+ name +"] 在表Category中不存在，请检查!" + e.Message));
			} 			
		}

		public string GetCateNameByCateID(string ID)
		{
			DataTable dt = new DataTable();
			SqlParameter[] parameters = {};
			
			try
			{
				using(SqlDatabase sqlDB = new SqlDatabase("select name from Category where ID = '" + ID + "'", parameters))
				{
					sqlDB.Run(dt);
				}
				return dt.Rows[0][0].ToString();
			}
			catch(Exception e)
			{
				throw( new Exception(" 类别 ["+ ID +"] 在表Category中不存在，请检查!" + e.Message));
			} 			
		}

		public DataTable GetAllCate()
		{
			DataTable dt = new DataTable();
			SqlParameter[] parameters = {};
			
			using(SqlDatabase sqlDB = new SqlDatabase("select * from Category", parameters))
			{
				sqlDB.Run(dt);
			}
			return dt;
		}
	}
}