The zlib module in Python is used to compress or decompress data for storage and transmission. It is the basis for other compression tools. Let's take a look at Python's method of compressing and decompressing strings and files using module zlib. If you don't say more, just look at the sample code.
Example 1: compressing and decompressing strings
Import zlib Message
= ' abcd1234 '
compressed = zlib
What is the use of SQL Server to compress data files?
Prelude:
The other day, due to customer problems (in fact, piracy issues), you can only use the free sqlserver Express version.
The data file size of the entire database of the Express version of sqlserver is limited to 4 GB, that is, no matter how many file groups you use, how many auxiliary data files N
It's a good idea to compress a winrar before backing up your data, which has at least the following advantages:
1. Save space. This depends on the nature of the source file, in general, the text-type Office document compression ratio is higher, and multimedia file compression effect is often not obvious.
2. Speed up replication. Backup files often need to be copied to n different locations/storage media, ev
It's a good idea to compress a winrar before backing up your data, which has at least the following advantages:
1. Save space. This depends on the nature of the source file, in general, the text-type Office document compression ratio is higher, and multimedia file compression effect is often not obvious.
2. Speed up replication. Backup files often need to be copied to n different locations/storage media,
This article describes how to compress and decompress gzip files in Python. it analyzes how to compress a gzip file into a gzip file and decompress a gzip file, and provides corresponding encapsulation classes, for more information about how to compress and decompress gzip files
How does php compress all files in a folder into a zip file? How does php compress all files in a folder into a zip file? For example, my localhosthas a testfolder with many files and folders in it. how can I pack all test.zip files
Compress data Create gzip fileslet's look at a slightly troubling approach
Import stringio,gzip
content = ' life are short. I use python '
zbuf = Stringio.stringio ()
zfile = gzip. Gzipfile (mode= ' WB ', Compresslevel=9, Fileobj=zbuf) zfile.write (
content)
Zfile.close ()
But in fact there is a quick package, do not use the Stringio module
f = gzip.open (' file.gz ', ' WB ')
f.write (content)
F.close ()
However, its volume is still very large. So, in daily work, how to slim down the backup files of SQL Server is a problem that many database administrators care about.
Perhaps Microsoft's database product design expert hears Many database administrator's voice. In the latest version 2008 SQL Server database, the concept of backup compression is presented. The basic principle and the use of RAR, such as compression tools compressed
When you used DAO, Microsoft provided CompactDatabase method to compress Microsoft Access files and RepairDatabase method to fix damaged Microsoft Access files. But since ADO came out, it seems like you forgot to provide the ability to compress and repair Microsoft Access files
The author is Weitong Lin.
With pages include more and more Ajax functionalities,We may need to include multiple JavaScript files. This may effect the pagePerformance.
Here are two utilities that can help us load page faster.
1. Compress JavaScript files:
You can refer to Yui compressor for. Net (http://yuicompressor.codeplex.com/Wiki/View.
(iox );}// Write the TXT fileTry {Arraylist list = getmidcolresdata (mobiletype, purpose );// Create a data rowList Data = List;For (Int J = 0; j String [] rows = (string []) data. Get (j );For (int K = 0; k Out. write (new string (rows [K]. getbytes ("ISO-8859-1"), "UTF-8"); // The Integrated string is reconverted once (it has been converted once when the database retrieves data)}}Try {Out. Flush ();Writer. Close ();} Catch (ioexception iox ){System. Err. println (iox );}} Catch (exception e )
Compressing file meaning saves network transmission bandwidth and reduces disk usage. But a certain CPU will be used.1. GzipCompression directory is not supported, gzip directly with the file name, when compressed in the current directory, the original file will disappear.#gzip filenameSpecify the compression directory: #gzip-C 123.txt >/tmp/123.txt.gz to compress the current directory 123.txt files into th
PackageCom.asia.test.TestZipFiles;ImportJava.io.BufferedInputStream;ImportJava.io.File;ImportJava.io.FileInputStream;ImportJava.io.FileOutputStream;Importjava.util.zip.CRC32;ImportJava.util.zip.CheckedOutputStream;ImportOrg.apache.tools.zip.ZipEntry;ImportOrg.apache.tools.zip.ZipOutputStream; Public classZipfiles { Public Static voidMain (String arg[]) {Compress ("E:\\test", "e:\\testzip\\");}Static Final intBUFFER = 2048; Public Static voidCompress (
The following two methods are provided to compress and decompress files in C:
Use the open-source sharpziplib. The following code uses sharpziplib for simple encapsulation of the compression and decompression class:
/// /// Fileziplib compression, decompressed class
/// Public class fileziplib
{
Public fileziplib (){}
/// /// Create a compressed file/// /// /// Public static void packfiles (string zipfilena
Example effect:After the project is compiled and published, delete some of the configuration files and then make the compressed package that publishes the files.#-*-coding:utf-8-*-ImportOs,sysImportZipFileImportDatetime,timedefGETTODAY_YYYYMMDD ():#return Time.strftime ("%y%m%d%h:%m:%s", Time.localtime (Time.time ())) returnTime.strftime ("%y%m%d", Time.localtime (Time.time ()))defremove_noneed_files (st
file link file1: Soft Link/symbolic Link: equivalent to a shortcut, the block of a soft connection file is a link to the upper directory inode that points to the real file2: Hard Link: Hard link and source file in the block table of the upper directory, all point to the inode of the actual same real file650) this.width=650; "src="/e/u261/themes/default/images/spacer.gif "style=" Background:url ("/e/u261/lang/zh-cn/ Images/localimage.png ") no-repeat center;border:1px solid #ddd;" alt= "Spacer.g
Method One: Compress file by right key menu
After you select one or more files, right-click the file, in the pop-up right-click menu, select "Add to Compressed File ...", in the new pop-up "you will create a compressed file" window, set the compression option, click "OK" to do the compression operation. If you generate a compressed file that you want to save under the current folder, you can also select Ad
Directory1. Introduction to Commands2. Common parameter Introduction3. Example4. Direct access to the bottomIntroduction to CommandsZip is a widely used compression program under the Linux system, and the file is compressed with a ". zip" extension. The zip command is used to compress the file into a common zip format, and the unzip command is used to extract the zip file.Back to CatalogCommon parameters IntroductionThe common parameters of the zip co
The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion;
products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the
content of the page makes you feel confusing, please write us an email, we will handle the problem
within 5 days after receiving your email.
If you find any instances of plagiarism from the community, please send an email to:
info-contact@alibabacloud.com
and provide relevant evidence. A staff member will contact you within 5 working days.