129 lines
4.9 KiB
HTML
129 lines
4.9 KiB
HTML
<!DOCTYPE html>
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<html><head>
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<link href="../sqlite.css" rel="stylesheet">
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<title>SQLite Release 3.6.21 On 2009-12-07</title>
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<!-- path=../ -->
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</head>
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<body>
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<div class=nosearch>
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<a href="../index.html">
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<img class="logo" src="../images/sqlite370_banner.gif" alt="SQLite" border="0">
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</a>
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<div><!-- IE hack to prevent disappearing logo --></div>
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<div class="tagline desktoponly">
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Small. Fast. Reliable.<br>Choose any three.
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</div>
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<div class="menu mainmenu">
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<ul>
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<li><a href="../index.html">Home</a>
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<li class='mobileonly'><a href="javascript:void(0)" onclick='toggle_div("submenu")'>Menu</a>
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<li class='wideonly'><a href='../about.html'>About</a>
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<li class='desktoponly'><a href="../docs.html">Documentation</a>
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<li class='desktoponly'><a href="../download.html">Download</a>
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<li class='wideonly'><a href='../copyright.html'>License</a>
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<li class='desktoponly'><a href="../support.html">Support</a>
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<li class='desktoponly'><a href="../prosupport.html">Purchase</a>
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<li class='search' id='search_menubutton'>
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<a href="javascript:void(0)" onclick='toggle_search()'>Search</a>
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</ul>
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</div>
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<div class="menu submenu" id="submenu">
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<ul>
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<li><a href='../about.html'>About</a>
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<li><a href='../docs.html'>Documentation</a>
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<li><a href='../download.html'>Download</a>
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<li><a href='../support.html'>Support</a>
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<li><a href='../prosupport.html'>Purchase</a>
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</ul>
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</div>
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<div class="searchmenu" id="searchmenu">
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<form method="GET" action="../search">
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<select name="s" id="searchtype">
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<option value="d">Search Documentation</option>
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<option value="c">Search Changelog</option>
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</select>
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<input type="text" name="q" id="searchbox" value="">
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<input type="submit" value="Go">
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</form>
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</div>
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</div>
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<script>
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function toggle_div(nm) {
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var w = document.getElementById(nm);
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if( w.style.display=="block" ){
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w.style.display = "none";
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}else{
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w.style.display = "block";
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}
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}
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function toggle_search() {
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var w = document.getElementById("searchmenu");
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if( w.style.display=="block" ){
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w.style.display = "none";
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} else {
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w.style.display = "block";
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setTimeout(function(){
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document.getElementById("searchbox").focus()
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}, 30);
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}
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}
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function div_off(nm){document.getElementById(nm).style.display="none";}
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window.onbeforeunload = function(e){div_off("submenu");}
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/* Disable the Search feature if we are not operating from CGI, since */
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/* Search is accomplished using CGI and will not work without it. */
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if( !location.origin || !location.origin.match || !location.origin.match(/http/) ){
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document.getElementById("search_menubutton").style.display = "none";
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}
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/* Used by the Hide/Show button beside syntax diagrams, to toggle the */
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function hideorshow(btn,obj){
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var x = document.getElementById(obj);
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var b = document.getElementById(btn);
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if( x.style.display!='none' ){
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x.style.display = 'none';
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b.innerHTML='show';
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}else{
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x.style.display = '';
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b.innerHTML='hide';
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}
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return false;
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}
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</script>
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</div>
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<h2>SQLite Release 3.6.21 On 2009-12-07</h2><p><ol class='lessindent'>
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<li>The SQL output resulting from <a href="../c3ref/profile.html">sqlite3_trace()</a> is now modified to include
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the values of <a href="../lang_expr.html#varparam">bound parameters</a>.
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<li>Performance optimizations targeting a specific use case from
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a single high-profile user of SQLite. A 12% reduction in the number of
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CPU operations is achieved (as measured by Valgrind). Actual performance
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improvements in practice may vary depending on workload. Changes
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include:
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<ol type='a'>
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<li>The <a href="../lang_corefunc.html#ifnull">ifnull()</a> and <a href="../lang_corefunc.html#coalesce">coalesce()</a> SQL functions are now implemented
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using in-line VDBE code rather than calling external functions, so that
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unused arguments need never be evaluated.
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<li>The <a href="../lang_corefunc.html#substr">substr()</a> SQL function does not bother to measure the length
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its entire input string if it is only computing a prefix
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<li>Unnecessary OP_IsNull, OP_Affinity, and OP_MustBeInt VDBE opcodes
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are suppressed
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<li>Various code refactorizations for performance
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</ol>
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<li>The FTS3 extension has undergone a major rework and cleanup.
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New <a href="../fts3.html">FTS3 documentation</a> is now available.
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<li>The <a href="../compile.html#secure_delete">SQLITE_SECURE_DELETE</a> compile-time option fixed to make sure that
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content is deleted even when the <a href="../lang_delete.html#truncateopt">truncate optimization</a> applies.
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<li>Improvements to "dot-command" handling in the
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<a href="../cli.html">Command Line Interface</a>.
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<li>Other minor bug fixes and documentation enhancements.
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</ol></p>
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<p>A <a href="../changes.html">complete list of SQLite releases</a>
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in a single page and a <a href="../chronology.html">chronology</a> are both also available.
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A detailed history of every
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check-in is available at
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<a href="http://www.sqlite.org/src/timeline">
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SQLite version control site</a>.</p>
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