其实 Lucene.net 对数据库建索引很简单,只要把数据表里面的记录读出来,然后对每个字段索引就行了.本文中数据库的内容是某个博客表－userblog表。
1.表结构:
字段名称 字段类型 字段含义
id Varchar(11) 编号
title Varchar(50) 标题
content Text 内容
2.程序流程
1) 打开数据库;
2) 建立索引;
3) 根据索引进行全文搜索.
4.附源码:
aspx文件:
<%@ Page language="c#" Codebehind="WebForm1.aspx.cs" AutoEventWireup="false" Inherits="WebApplication4.WebForm1" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
<HEAD>
<title>使用Lucene.net建立简单的数据库搜索程序</title>
<meta content="Microsoft Visual Studio .NET 7.1" name="GENERATOR">
<meta content="C#" name="CODE_LANGUAGE">
<meta content="JavaScript" name="vs_defaultClientScript">
<meta content="http://schemas.microsoft.com/intellisense/ie5" name="vs_targetSchema">
</HEAD>
<body MS_POSITIONING="GridLayout">
<form id="Form1" method="post" runat="server">
<table width="100%" border="0">
<tr>
<td>
<asp:textbox id="tj" runat="server"></asp:textbox><asp:button id="Search" runat="server" Text="搜索"></asp:button></td>
</tr>
</table>
<table width="100%" border="0">
<tr>
<td><asp:datagrid id="SearGrid" runat="server" AutoGenerateColumns="False">
<Columns>
<asp:TemplateColumn>
<HeaderTemplate>
搜索结果:
</HeaderTemplate>
<ItemTemplate>
<table width="100%" border="0">
<tr>
<td>id:<%# DataBinder.Eval(Container.DataItem,"id") %>
</td>
</tr>
<tr>
<td>标题:
<%# DataBinder.Eval(Container.DataItem,"title") %>
</td>
</tr>
<tr>
<td>内容:
<%# DataBinder.Eval(Container.DataItem,"content") %>
</td>
</tr>
<tr>
<td> </td>
</tr>
</table>
</ItemTemplate>
</asp:TemplateColumn>
</Columns>
</asp:datagrid></td>
</tr>
</table>
</form>
</body>
</HTML>
cs代码
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Data.SqlClient;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using Lucene.Net;
using Lucene.Net.Index;
using Lucene.Net.Documents;
using Lucene.Net.QueryParsers;
using Lucene.Net.Search;
using Lucene.Net.Analysis.Standard;
using Lucene.Net.Analysis.Cn;
namespace WebApplication4
{
/**//// <summary>
/// WebForm1 的摘要说明。
/// </summary>
public class WebForm1 : System.Web.UI.Page
{
protected System.Web.UI.WebControls.TextBox tj;
protected System.Web.UI.WebControls.Button Search;
protected System.Web.UI.WebControls.DataGrid SearGrid;
public string connstr="server=.;database=TopWin2;uid=sa;pwd=";
private void Page_Load(object sender, System.EventArgs e)
{
// 在此处放置用户代码以初始化页面
if (!Page.IsPostBack)
{
//打开数据库表
SqlDataReader myred=OpenTable();
//建立索引
IndexWriter writer=CreateIndex(myred);
}
}
public SqlDataReader OpenTable()
{
SqlConnection mycon=new SqlConnection(connstr);
mycon.Open();
SqlCommand mycom=new SqlCommand("select id,title,content from userblog order by id",mycon);
return mycom.ExecuteReader();
}
public IndexWriter CreateIndex(SqlDataReader myred)
{
IndexWriter writer = new IndexWriter("c:/index/", new ChineseAnalyzer(), true);
try
{
//建立索引字段
while(myred.Read())
{
Document doc=new Document();
doc.Add(Field.Keyword("id",myred["id"].ToString()));
doc.Add(Field.Text("title",myred["title"].ToString()));
doc.Add(Field.Text("content",myred["content"].ToString()));
writer.AddDocument(doc);
}
writer.Optimize();
writer.Close();
}
catch(Exception e)
{
Response.Write(e);
}
return writer;
}
public Hits seacher(String queryString)
{
Hits hits=null;
try
{
IndexSearcher mysea=new IndexSearcher("c:/index/");
Query query=QueryParser.Parse(queryString,"content",new ChineseAnalyzer());
hits=mysea.Search(query);
}
catch(Exception e)
{
Response.Write(e);
}
return hits;
}
Web 窗体设计器生成的代码#region Web 窗体设计器生成的代码
override protected void OnInit(EventArgs e)
{
//
// CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。
//
InitializeComponent();
base.OnInit(e);
}
/**//// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.Search.Click += new System.EventHandler(this.Search_Click);
this.Load += new System.EventHandler(this.Page_Load);
}
#endregion
private void Search_Click(object sender, System.EventArgs e)