tfidflib.cs

实现文本的特征提取

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

namespace Njnu.DAL
{
	/// <summary>
	/// TfidfLib 的摘要说明。
	/// </summary>
	public class TfidfLib
	{
		public DataTable GetTfidfLibBydocID(string docID)
		{
			DataTable dt = new DataTable();
			SqlParameter[] parameters = {};
			
			string str = "select * from TfidfLib_test where docID = '" + docID + "'";
			using(SqlDatabase sqlDB = new SqlDatabase(str, parameters))
			{
				sqlDB.Run(dt);
			}
			return dt;
		}

		public DataTable GetTfidfLib(string cateID, string tableName)
		{
			DataTable dt = new DataTable();
			SqlParameter[] parameters = {};
			
			string str = "select * from " + tableName + " where cateID ='" + cateID + "'";
			using(SqlDatabase sqlDB = new SqlDatabase(str, parameters))
			{
				sqlDB.Run(dt);
			}
			return dt;
		}

		public DataTable GetDistinctTfidfLib(string cateID, string tableName)
		{
			DataTable dt = new DataTable();
			SqlParameter[] parameters = {};
			
			string str = "select distinct(word),cateID from " + tableName + " where cateID ='" + cateID + "'";
			using(SqlDatabase sqlDB = new SqlDatabase(str, parameters))
			{
				sqlDB.Run(dt);
			}
			return dt;
		}
	}
}