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[Lucene]-Lucene基本概述以及简单实例

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一、Lucene基本介绍：基本信息：Lucene 是 Apache 软件基金会的一个开放源代码的全文检索引擎工具包，是一个全文检索引擎的架构，提供了完整的查询引擎和索引引擎，部分文本分析引擎。Lucene 的目的是为软件开发人员提供一个简单易用的工具包，以方便的在目标系统中实现全文检索的功能，或者是以此为基础建立起完整的全文检索引擎。文件结构：自上而下树形展开，一对多。索引Index：相当于库或者表。段Segment:相当于分库或者分表。文档Document:相当一条数据，如小说吞噬星空域Field：一片文档可以分为多个域，相当于字段，如：小说作者，标题，内容。。。词元Term:一个域又可以分为多个词元，词元是做引搜索的最小单位，标准分词下得词元是一个个单词和汉字。正向信息：索引->段->文档->域->词反向信息：词->文档。　二、Lucene全文检索： 1、数据分类：结构化数据：数据库，固定长度和格式的数据。半结构化数据：如xml,html,等..。非结构化数据：长度和格式都不固定的数据，如文本... 2、检索过程：Luncene检索过程可以分为两个部分，一个部分是上图左侧结构化，半结构化，非结构化数据的索引建立过程，另一部分是右侧索引查询过程。索引过程：有一系列被索引文件被索引文件经过语法分析和语言处理形成一系列词(Term)。

Node - Prevent child process from going in to parent directory

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问题 I am spawning a process from my node server, that is in /tmp/running/username (it is a node process uploaded by the user) how do I prevent it from reading (or knowing of the existence of) anything other than /tmp/running/username ? I can spawn the process in any required way. 回答1: You could spawn the process as an argument for chroot , which will change the root directory for your process: spawn('chroot', ['/tmp/running/username', 'yourprocess', 'arg1', ...]); An alternative would be to use

Error: The process cannot access the file '…' because it is being used by another process

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问题 I have a function that always creates a directory and put in it some files (images). When the code runs first time, no problem. Second time (always), it gets an error when I have to delete the directory (because I want to recreate it to put in it the images). The error is "The process cannot access the file '...' because it is being used by another process". The only process that access to this files is this function. It's like the function "doesn't leave" the files. How can I resolve this

Copy A File In AppleScript

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问题 I have the code below to set a variable in Applescript for the path to the iTunes Music Folder: set username to text returned of (display dialog "RingtoneDude" default answer "Enter your path to your iTunes Ringtones folder here. e.g. /Users/David/Music/iTunes/iTunes Music/Ringtones" buttons {"Confirm", "Cancel"} default button 1) And then I have the code to call the variable username to copy a file tell application "Finder" copy file theCopy to username end tell but the file theCopy which is

copy folder, subfolders and files from a path to another path in python via a recursive function

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问题 I want to copy some folders and files from a path to another path. for example, I want to copy the folder(called folder1) which has some other subfolders and some files inside itself to another folder(dst). In my program, at the first, I want to check if there is a folder named folder1 in destination folder and if not, create a folder with folder1 name and then copy the content of folder1 to target. In addition, maybe we have folder1 in the target path, but there are some subfolders of

Python error: Cannot find the file specified

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问题 This is my body of code: os.chdir("C:\\Users\\Desktop") rc = subprocess.call(['7z', 'a', 'test', '-y', 'myarchive.zip'] + [r'device teams.txt']) It gives me an error pointing to r'device teams.txt' saying the specified file does not exist. I checked the directory and it is in the desktop directory so I am not sure why it is giving me this error 回答1: Based on your comments, the problem isn't the txt file path, it's that the command 7z cannot be found. You can check this by just calling rc =

is_dir() with non-english characters

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问题 In php, is_dir() function omits directories which contains non-english characters. ie. is_dir("C:\ekşi") is not directory according to the function but it is. Is there any solutions to this case? Thanks 回答1: Sadly, this is no bug. Until PHP 6, no unicode caharcter support for this kind of operations. Reference: http://www.php.net/manual/en/function.scandir.php#96140 来源： https://stackoverflow.com/questions/4904004/is-dir-with-non-english-characters

How to recursively walk through a directory and print all files in C?

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问题 I am trying to recursively walk through a directory and print out all of the files. When I try doing it with the code below, for example I call the function with sprint(".", ".") I get an output of a bunch of dots. When I reduce the amount of open processes allowed (ulimit -n 20) I get 17 dots. I don't understand though because I thought readdir() and opendir() doesn't make new processes. Here is my code: void sprint(char *filename, char * dirToOpen) { DIR *directory = opendir(dirToOpen);

Unix - Compare two directories recursively, output differences as a list minus directories

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问题 I have an archive system that archives any file (and the corresponding directory structure of where that file is located) to another volume. It ignores empty directories. After the archive has created a copy to an external volume, I've been using the following command to list the differences to make sure that no file has been missed: diff -qr dir1(original) dir2(archive) My problem is that all of the empty directories that the archive system ignores show up and clog the resulting list. Is

Batch file to delete all folders in a directory except the newest folder

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问题 I am trying to delete old backups in a specific folder after a new backup has been done. As i do not really have experience with DOS commands i mashed a couple of scripts i found on the internet into one: ::(C)2008 "BuckFix" www.winsupportforum.de @echo off setlocal set workdir="M:\BACKUPS\CACHE_SSD\" set folder= :: get list of all folders, oldest first dir %workdir% /AD /B /t:w /OD > %temp%folder.tmp for /f "tokens=1* delims=" %%i in (%temp%folder.tmp) do set "folder=%%i" del %temp%folder