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+<!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>Write Data Into A BLOB Incrementally</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';
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+x.style.display = '';
+b.innerHTML='hide';
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+return false;
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+document.body.onmousedown=function(){
+antiRobot |= 2;
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+antiRobotGo();
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+antiRobotDefense();
+</script>
+<!-- keywords: sqlite3_blob_write -->
+<div class=nosearch>
+<a href="../c3ref/intro.html"><h2>SQLite C Interface</h2></a>
+<h2>Write Data Into A BLOB Incrementally</h2>
+</div>
+<blockquote><pre>
+int sqlite3_blob_write(sqlite3_blob *, const void *z, int n, int iOffset);
+</pre></blockquote>
+<p>
+This function is used to write data into an open <a href="../c3ref/blob.html">BLOB handle</a> from a
+caller-supplied buffer. N bytes of data are copied from the buffer Z
+into the open BLOB, starting at offset iOffset.</p>
+
+<p>On success, sqlite3_blob_write() returns SQLITE_OK.
+Otherwise, an <a href="../rescode.html">error code</a> or an <a href="../rescode.html#extrc">extended error code</a> is returned.
+Unless SQLITE_MISUSE is returned, this function sets the
+<a href="../c3ref/sqlite3.html">database connection</a> error code and message accessible via
+<a href="../c3ref/errcode.html">sqlite3_errcode()</a> and <a href="../c3ref/errcode.html">sqlite3_errmsg()</a> and related functions.</p>
+
+<p>If the <a href="../c3ref/blob.html">BLOB handle</a> passed as the first argument was not opened for
+writing (the flags parameter to <a href="../c3ref/blob_open.html">sqlite3_blob_open()</a> was zero),
+this function returns <a href="../rescode.html#readonly">SQLITE_READONLY</a>.</p>
+
+<p>This function may only modify the contents of the BLOB; it is
+not possible to increase the size of a BLOB using this API.
+If offset iOffset is less than N bytes from the end of the BLOB,
+<a href="../rescode.html#error">SQLITE_ERROR</a> is returned and no data is written. The size of the
+BLOB (and hence the maximum value of N+iOffset) can be determined
+using the <a href="../c3ref/blob_bytes.html">sqlite3_blob_bytes()</a> interface. If N or iOffset are less
+than zero <a href="../rescode.html#error">SQLITE_ERROR</a> is returned and no data is written.</p>
+
+<p>An attempt to write to an expired <a href="../c3ref/blob.html">BLOB handle</a> fails with an
+error code of <a href="../rescode.html#abort">SQLITE_ABORT</a>. Writes to the BLOB that occurred
+before the <a href="../c3ref/blob.html">BLOB handle</a> expired are not rolled back by the
+expiration of the handle, though of course those changes might
+have been overwritten by the statement that expired the BLOB handle
+or by other independent statements.</p>
+
+<p>This routine only works on a <a href="../c3ref/blob.html">BLOB handle</a> which has been created
+by a prior successful call to <a href="../c3ref/blob_open.html">sqlite3_blob_open()</a> and which has not
+been closed by <a href="../c3ref/blob_close.html">sqlite3_blob_close()</a>. Passing any other pointer in
+to this routine results in undefined and probably undesirable behavior.</p>
+
+<p>See also: <a href="../c3ref/blob_read.html">sqlite3_blob_read()</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>
+