CINXE.COM

<!DOCTYPE html> <html><head> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> <link href="../sqlite.css" rel="stylesheet"> <title>SQLite Release 3.7.12 On 2012-05-14</title>  </head> <body> <div class=nosearch> <a href="../index.html"> <img class="logo" src="../images/sqlite370_banner.svg" alt="SQLite" border="0"> </a> <div></div> <div class="tagline desktoponly"> Small. Fast. Reliable.<br>Choose any three. </div> <div class="menu mainmenu"> <ul> <li><a href="../index.html">Home</a> <li class='mobileonly'><a href="javascript:void(0)" onclick='toggle_div("submenu")'>Menu</a> <li class='wideonly'><a href='../about.html'>About</a> <li class='desktoponly'><a href="../docs.html">Documentation</a> <li class='desktoponly'><a href="../download.html">Download</a> <li class='wideonly'><a href='../copyright.html'>License</a> <li class='desktoponly'><a href="../support.html">Support</a> <li class='desktoponly'><a href="../prosupport.html">Purchase</a> <li class='search' id='search_menubutton'> <a href="javascript:void(0)" onclick='toggle_search()'>Search</a> </ul> </div> <div class="menu submenu" id="submenu"> <ul> <li><a href='../about.html'>About</a> <li><a href='../docs.html'>Documentation</a> <li><a href='../download.html'>Download</a> <li><a href='../support.html'>Support</a> <li><a href='../prosupport.html'>Purchase</a> </ul> </div> <div class="searchmenu" id="searchmenu"> <form method="GET" action="../search"> <select name="s" id="searchtype"> <option value="d">Search Documentation</option> <option value="c">Search Changelog</option> </select> <input type="text" name="q" id="searchbox" value=""> <input type="submit" value="Go"> </form> </div> </div> <script> function toggle_div(nm) { var w = document.getElementById(nm); if( w.style.display=="block" ){ w.style.display = "none"; }else{ w.style.display = "block"; } } function toggle_search() { var w = document.getElementById("searchmenu"); if( w.style.display=="block" ){ w.style.display = "none"; } else { w.style.display = "block"; setTimeout(function(){ document.getElementById("searchbox").focus() }, 30); } } function div_off(nm){document.getElementById(nm).style.display="none";} window.onbeforeunload = function(e){div_off("submenu");} /* Disable the Search feature if we are not operating from CGI, since */ /* Search is accomplished using CGI and will not work without it. */ if( !location.origin || !location.origin.match || !location.origin.match(/http/) ){ document.getElementById("search_menubutton").style.display = "none"; } /* Used by the Hide/Show button beside syntax diagrams, to toggle the */ function hideorshow(btn,obj){ var x = document.getElementById(obj); var b = document.getElementById(btn); if( x.style.display!='none' ){ x.style.display = 'none'; b.innerHTML='show'; }else{ x.style.display = ''; b.innerHTML='hide'; } return false; } var antiRobot = 0; function antiRobotGo(){ if( antiRobot!=3 ) return; antiRobot = 7; var j = document.getElementById("mtimelink"); if(j && j.hasAttribute("data-href")) j.href=j.getAttribute("data-href"); } function antiRobotDefense(){ document.body.onmousedown=function(){ antiRobot |= 2; antiRobotGo(); document.body.onmousedown=null; } document.body.onmousemove=function(){ antiRobot |= 2; antiRobotGo(); document.body.onmousemove=null; } setTimeout(function(){ antiRobot |= 1; antiRobotGo(); }, 100) antiRobotGo(); } antiRobotDefense(); </script> <h2>SQLite Release 3.7.12 On 2012-05-14</h2><p><ol class='lessindent'> <li>Add the <a href="../c3ref/c_dbstatus_options.html#sqlitedbstatuscachewrite">SQLITE_DBSTATUS_CACHE_WRITE</a> option for <a href="../c3ref/db_status.html">sqlite3_db_status()</a>. <li>Optimize the <a href="../lang_corefunc.html#typeof">typeof()</a> and <a href="../lang_corefunc.html#length">length()</a> SQL functions so that they avoid unnecessary reading of database content from disk. <li>Add the <a href="../fts3.html#*fts4mergecmd">FTS4 "merge" command</a>, the <a href="../fts3.html#*fts4automergecmd">FTS4 "automerge" command</a>, and the <a href="../fts3.html#*fts4ickcmd">FTS4 "integrity-check" command</a>. <li>Report the name of specific <a href="../lang_createtable.html#ckconst">CHECK</a> constraints that fail. <li>In the command-line shell, use popen() instead of fopen() if the first character of the argument to the ".output" command is "|". <li>Make use of OVERLAPPED in the windows <a href="../vfs.html">VFS</a> to avoid some system calls and thereby obtain a performance improvement. <li>More aggressive optimization of the AND operator when one side or the other is always false. <li>Improved performance of queries with many OR-connected terms in the WHERE clause that can all be indexed. <li>Add the <a href="../compile.html#rtree_int_only">SQLITE_RTREE_INT_ONLY</a> compile-time option to force the <a href="../rtree.html">R*Tree Extension Module</a> to use integer instead of floating point values for both storage and computation. <li>Enhance the <a href="../pragma.html#pragma_integrity_check">PRAGMA integrity_check</a> command to use much less memory when processing multi-gigabyte databases. <li>New interfaces added to the test_quota.c add-on module. <li>Added the ".trace" dot-command to the command-line shell. <li>Allow virtual table constructors to be invoked recursively. <li>Improved optimization of ORDER BY clauses on compound queries. <li>Improved optimization of aggregate subqueries contained within an aggregate query. <li>Bug fix: Fix the <a href="../lang_savepoint.html">RELEASE</a> command so that it does not cancel pending queries. This repairs a problem introduced in 3.7.11. <li>Bug fix: Do not discard the DISTINCT as superfluous unless a subset of the result set is subject to a UNIQUE constraint <em>and</em> it none of the columns in that subset can be NULL. Ticket <a href="https://www.sqlite.org/src/info/385a5b56b9">385a5b56b9</a>. <li>Bug fix: Do not optimize away an ORDER BY clause that has the same terms as a UNIQUE index unless those terms are also NOT NULL. Ticket <a href="https://www.sqlite.org/src/info/2a5629202f">2a5629202f</a>. <li>SQLITE_SOURCE_ID: "2012-05-14 01:41:23 8654aa9540fe9fd210899d83d17f3f407096c004" <li>SHA1 for sqlite3.c: 57e2104a0f7b3f528e7f6b7a8e553e2357ccd2e1 </ol></p> <p>A <a href="../changes.html">complete list of SQLite releases</a> in a single page and a <a href="../chronology.html">chronology</a> are both also available. A detailed history of every check-in is available at <a href="https://www.sqlite.org/src/timeline"> SQLite version control site</a>.</p>