diff options
Diffstat (limited to 'www/c3ref/load_extension.html')
-rw-r--r-- | www/c3ref/load_extension.html | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/www/c3ref/load_extension.html b/www/c3ref/load_extension.html new file mode 100644 index 0000000..182f142 --- /dev/null +++ b/www/c3ref/load_extension.html @@ -0,0 +1,175 @@ +<!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>Load An Extension</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> +<!-- keywords: sqlite3_load_extension --> +<div class=nosearch> +<a href="../c3ref/intro.html"><h2>SQLite C Interface</h2></a> +<h2>Load An Extension</h2> +</div> +<blockquote><pre> +int sqlite3_load_extension( + sqlite3 *db, /* Load the extension into this database connection */ + const char *zFile, /* Name of the shared library containing extension */ + const char *zProc, /* Entry point. Derived from zFile if 0 */ + char **pzErrMsg /* Put error message here if not 0 */ +); +</pre></blockquote> +<p> +This interface loads an SQLite extension library from the named file.</p> + +<p>The sqlite3_load_extension() interface attempts to load an +<a href="../loadext.html">SQLite extension</a> library contained in the file zFile. If +the file cannot be loaded directly, attempts are made to load +with various operating-system specific extensions added. +So for example, if "samplelib" cannot be loaded, then names like +"samplelib.so" or "samplelib.dylib" or "samplelib.dll" might +be tried also.</p> + +<p>The entry point is zProc. +zProc may be 0, in which case SQLite will try to come up with an +entry point name on its own. It first tries "sqlite3_extension_init". +If that does not work, it constructs a name "sqlite3_X_init" where the +X is consists of the lower-case equivalent of all ASCII alphabetic +characters in the filename from the last "/" to the first following +"." and omitting any initial "lib". +The sqlite3_load_extension() interface returns +<a href="../rescode.html#ok">SQLITE_OK</a> on success and <a href="../rescode.html#error">SQLITE_ERROR</a> if something goes wrong. +If an error occurs and pzErrMsg is not 0, then the +<a href="../c3ref/load_extension.html">sqlite3_load_extension()</a> interface shall attempt to +fill *pzErrMsg with error message text stored in memory +obtained from <a href="../c3ref/free.html">sqlite3_malloc()</a>. The calling function +should free this memory by calling <a href="../c3ref/free.html">sqlite3_free()</a>.</p> + +<p>Extension loading must be enabled using +<a href="../c3ref/enable_load_extension.html">sqlite3_enable_load_extension()</a> or +<a href="../c3ref/db_config.html">sqlite3_db_config</a>(db,<a href="../c3ref/c_dbconfig_defensive.html#sqlitedbconfigenableloadextension">SQLITE_DBCONFIG_ENABLE_LOAD_EXTENSION</a>,1,NULL) +prior to calling this API, +otherwise an error will be returned.</p> + +<p><b>Security warning:</b> It is recommended that the +<a href="../c3ref/c_dbconfig_defensive.html#sqlitedbconfigenableloadextension">SQLITE_DBCONFIG_ENABLE_LOAD_EXTENSION</a> method be used to enable only this +interface. The use of the <a href="../c3ref/enable_load_extension.html">sqlite3_enable_load_extension()</a> interface +should be avoided. This will keep the SQL function <a href="../lang_corefunc.html#load_extension">load_extension()</a> +disabled and prevent SQL injections from giving attackers +access to extension loading capabilities.</p> + +<p>See also the <a href="../lang_corefunc.html#load_extension">load_extension() SQL function</a>. +</p><p>See also lists of + <a href="../c3ref/objlist.html">Objects</a>, + <a href="../c3ref/constlist.html">Constants</a>, and + <a href="../c3ref/funclist.html">Functions</a>.</p> + |