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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"><html><head><title>About SQLite</title><style type="text/css">body { margin: auto; font-family: "Verdana" "sans-serif"; padding: 8px 1%;}a { color: #45735f }a:visited { color: #734559 }.logo { position:absolute; margin:3px; }.tagline { float:right; text-align:right; font-style:italic; width:240px; margin:12px; margin-top:58px;}.toolbar { font-variant: small-caps; text-align: center; line-height: 1.6em; margin: 0; padding:1px 8px;}.toolbar a { color: white; text-decoration: none; padding: 6px 12px; }.toolbar a:visited { color: white; }.toolbar a:hover { color: #80a796; background: white; }.content { margin: 5%; }.content dt { font-weight:bold; }.content dd { margin-bottom: 25px; margin-left:20%; }.content ul { padding:0px; padding-left: 15px; margin:0px; }/* rounded corners */.se { background: url(images/se.png) 100% 100% no-repeat #80a796}.sw { background: url(images/sw.png) 0% 100% no-repeat }.ne { background: url(images/ne.png) 100% 0% no-repeat }.nw { background: url(images/nw.png) 0% 0% no-repeat }</style><meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head><body><div><!-- container div to satisfy validator --><a href="index.html"><img class="logo" src="images/SQLite.gif" alt="SQLite Logo" border="0"></a><div><!-- IE hack to prevent disappearing logo--></div><div class="tagline">Small. Fast. Reliable.<br>Choose any three.</div><table width=100% style="clear:both"><tr><td> <div class="se"><div class="sw"><div class="ne"><div class="nw"> <div class="toolbar"> <a href="about.html">About</a> <a href="sitemap.html">Sitemap</a> <a href="docs.html">Documentation</a> <a href="download.html">Download</a> <a href="copyright.html">License</a> <a href="news.html">News</a> <a href="http://www.sqlite.org/cvstrac/index">Developers</a> <a href="support.html">Support</a> </div></div></div></div></div></td></tr></table> <h3>About SQLite</h3><table align="right" border="1" cellpadding="10" hspace="20" cellspacing="0"><tr><td><small><b>See Also...</b><p><ul><li> <a href="features.html">Features</a> </li><li> <a href="faq.html">Frequently Asked Questions</a> </li><li> <a href="famous.html">Well-known Users</a> </li><li> <a href="different.html">Distinctive Features</a><li> <a href="quickstart.html">Getting Started</a> </li><li> <a href="lang.html">SQL Syntax</a> </li><li> <a href="c3ref/intro.html">C/C++ Interface Spec</a> </li><li> <a href="http://www.sqlite.org/cvstrac/timeline">Timeline</a> </li><li> <a href="http://www.sqlite.org/cvstrac/wiki">Wiki</a> </li></ul></p></small></td></tr></table><p>SQLite is a in-process library that implements a<a href="selfcontained.html">self-contained</a>, <a href="serverless.html">serverless</a>,<a href="zeroconf.html">zero-configuration</a>,<a href="transactional.html">transactional</a>SQL database engine.The code for SQLite is in the<a href="copyright.html">public domain</a> and is thus free foruse for any purpose, commercial or private.SQLite is currently found in more applications than we cancount, including several <a href="famous.html">high-profile projects.</a></p><p>SQLite is an embedded SQL database engine.Unlike most other SQL databases, SQLite does not have a separateserver process. SQLite reads and writes directly to ordinary diskfiles. A complete SQL database with multiple tables, indices,triggers, and views, is contained in a single disk file.The database file format is cross-platform - you can freely copy a databasebetween 32-bit and 64-bit systems or between <a href="http://en.wikipedia.org/wiki/Endianness">big-endian</a> and<a href="http://en.wikipedia.org/wiki/Endianness">little-endian</a>architectures. These features make SQLite a popular choice asan <a href="whentouse.html#appfileformat">Application File Format</a>.Think of SQLite not as a replacement for <a href="http://www.oracle.com/database/index.html">Oracle</a> butas a replacement for <a href="http://man.he.net/man3/fopen">fopen()</a></p><p>SQLite is a compact library.With all features enabled, the library size can be less than 250KiB,depending on compiler optimization settings. (Some compiler optimizationssuch as agressive function inlining and loop unrolling can cause theobject code to be much larger.) If optional features are omitted, thesize of the SQLite library can be reduced below 180KiB. SQLite can alsobe made to run in minimal stack space (16KiB) andvery little heap (100KiB), making SQLite a popular database engine choice on memory constrained gadgets such as cellphones, PDAs, and MP3 players.There is a tradeoff between memory usage and speed. SQLite generally runs faster the more memoryyou give it. Nevertheless, performance is usually quite good evenin low-memory environments.</p><p>SQLite has a reputation for being very reliable.Over two-thirds of the source code is devoted purely to testing andverification. An automated test suite runs hundreds of thousands oftests involving millions of individual SQL statements and achievesover 99% statement coverage. SQLite responds gracefully to memoryallocation failures and disk I/O errors. Transactions are<a href="http://en.wikipedia.org/wiki/ACID">ACID</a>even if interrupted by system crashes or power failures. All of this is verified bythe automated tests using special test harnesses which simulate system failures.Of course, even with all this testing, there are still bugs.But unlike some similar projects (especially commercial competitors)SQLite is open and honest about all bugs and provides<a href="http://www.sqlite.org/cvstrac/rptview?rn=5">bugs lists</a>including lists of<a href="http://www.sqlite.org/cvstrac/wiki?p=DatabaseCorruption">critical bugs</a> andminute-by-minute <a href="http://www.sqlite.org/cvstrac/timeline">chronologies</a> of bug reports and code changes.</p><p>The SQLite code base is supported by an<a href="crew.html">international team</a> of developers who work onSQLite full-time.The developers continue to expand the capabilities of SQLiteand enhance its reliability and performance while maintainingbackwards compatibility with the <a href="c3ref/intro.html">published interface spec</a>,<a href="lang.html">SQL syntax</a>, and database file format.The source code is absolutely free to anybody who wants it,but <a href="http://www.hwaci.com/sw/sqlite/prosupport.html">professional support services</a> are also available.</p><p>We the developers hope that you find SQLite useful and wecharge you to use it well: to make good and beautiful products thatare fast, reliable, and simple to use. Seek forgiveness for yourselfas you forgive others. And just as you have received SQLite for free,so also freely give, paying the debt forward.</p><hr><small><i>This page last modified 2008/01/31 16:26:37 UTC</i></small></div></body></html>⌨️ 快捷键说明
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