<!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 3.40.1 On 2022-12-28</title> <!-- path=../ --> </head> <body> <div class=nosearch> <a href="../index.html"> <img class="logo" src="../images/sqlite370_banner.gif" alt="SQLite" border="0"> </a> <div><!-- IE hack to prevent disappearing logo --></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 3.40.1 On 2022-12-28</h2><p><b>Changes in version 3.40.0 (2022-11-16):</b></p> <p><ol class='lessindent'> <li value='1'> Add support for compiling <a href="https://sqlite.org/wasm">SQLite to WASM</a> and running it in web browsers. NB: The WASM build and its interfaces are considered "beta" and are subject to minor changes if the need arises. We anticipate finalizing the interface for the next release. <li> Add the <a href="../recovery.html">recovery extension</a> that might be able to recover some content from a corrupt database file. <li> Query planner enhancements: <ol type="a"> <li> Recognize <a href="../queryplanner.html#covidx">covering indexes</a> on tables with more than 63 columns where columns beyond the 63rd column are used in the query and/or are referenced by the index. <li> Extract the values of expressions contained within <a href="../expridx.html">expression indexes</a> where practical, rather than recomputing the expression. <li> The NOT NULL and IS NULL operators (and their equivalents) avoid loading the content of large strings and BLOB values from disk. <li> Avoid materializing a view on which a full scan is performed exactly once. Use and discard the rows of the view as they are computed. <li> Allow flattening of a subquery that is the right-hand operand of a LEFT JOIN in an aggregate query. </ol> <li> A new typedef named <a href="../c3ref/filename.html">sqlite3_filename</a> is added and used to represent the name of a database file. Various interfaces are modified to use the new typedef instead of "char*". This interface change should be fully backwards compatible, though it might cause (harmless) compiler warnings when rebuilding some legacy applications. <li> Add the <a href="../c3ref/value_blob.html">sqlite3_value_encoding()</a> interface. <li> Security enhancement: <a href="../c3ref/c_dbconfig_defensive.html#sqlitedbconfigdefensive">SQLITE_DBCONFIG_DEFENSIVE</a> is augmented to prohibit changing the <a href="../pragma.html#pragma_schema_version">schema_version</a>. The schema_version becomes read-only in defensive mode. <li> Enhancements to the <a href="../pragma.html#pragma_integrity_check">PRAGMA integrity_check</a> statement: <ol type="a"> <li> Columns in non-STRICT tables with TEXT affinity should not contain numeric values. <li> Columns in non-STRICT tables with NUMERIC affinity should not contain TEXT values that could be converted into numbers. <li> Verify that the rows of a <a href="../withoutrowid.html">WITHOUT ROWID</a> table are in the correct order. </ol> <li> Enhance the <a href="../lang_vacuum.html#vacuuminto">VACUUM INTO</a> statement so that it honors the <a href="../pragma.html#pragma_synchronous">PRAGMA synchronous</a> setting. <li> Enhance the <a href="../c3ref/strglob.html">sqlite3_strglob()</a> and <a href="../c3ref/strlike.html">sqlite3_strlike()</a> APIs so that they are able to accept NULL pointers for their string parameters and still generate a sensible result. <li> Provide the new <a href="../compile.html#max_allocation_size">SQLITE_MAX_ALLOCATION_SIZE</a> compile-time option for limiting the size of memory allocations. <li> Change the algorithm used by SQLite's built-in pseudo-random number generator (PRNG) from RC4 to Chacha20. <li> Allow two or more indexes to have the same name as long as they are all in separate schemas. <li> Miscellaneous performance optimizations result in about 1% fewer CPU cycles used on typical workloads. </ol> <p><b>Additional changes in version 3.40.1 (2022-12-28):</b></p> <p><ol class='lessindent'> <li value='14'> Fix the <a href="../cli.html#safemode">--safe command-line option</a> to the <a href="../cli.html">CLI</a> such that it correctly disallows the use of SQL functions like writefile() that can cause harmful side-effects. <li> Fix a potential infinite loop in the <a href="../malloc.html#memsys5">memsys5</a> alternative memory allocator. This bug was introduced by a performance optimization in version 3.39.0. <li> Various other obscure fixes. <p><b>Hashes:</b> <li>SQLITE_SOURCE_ID: 2022-12-28 14:03:47 df5c253c0b3dd24916e4ec7cf77d3db5294cc9fd45ae7b9c5e82ad8197f38a24 <li>SHA3-256 for sqlite3.c: 4d6800e9032ff349376fe612e422b49ba5eb4e378fac0b3e405235d09dd366ab </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="http://www.sqlite.org/src/timeline"> SQLite version control site</a>.</p>