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