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+<title>Write Data Into A BLOB Incrementally</title>
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+<!-- keywords: sqlite3_blob_write -->
+<div class=nosearch>
+<a href="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="objlist.html">Objects</a>,
+  <a href="constlist.html">Constants</a>, and
+  <a href="funclist.html">Functions</a>.</p>
+