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+<a href="intro.html"><h2>Session Module C Interface</h2></a><h2>Generate A Patchset From A Session Object</h2><blockquote><pre>int sqlite3session_patchset(
+  sqlite3_session *pSession,      /* Session object */
+  int *pnPatchset,                /* OUT: Size of buffer at *ppPatchset */
+  void **ppPatchset               /* OUT: Buffer containing patchset */
+);
+</pre></blockquote><p>
+The differences between a patchset and a changeset are that:</p>
+
+<p><ul>
+  <li> DELETE records consist of the primary key fields only. The 
+       original values of other fields are omitted.
+  <li> The original values of any modified fields are omitted from 
+       UPDATE records.
+</ul></p>
+
+<p>A patchset blob may be used with up to date versions of all 
+sqlite3changeset_xxx API functions except for sqlite3changeset_invert(), 
+which returns SQLITE_CORRUPT if it is passed a patchset. Similarly,
+attempting to use a patchset blob with old versions of the
+sqlite3changeset_xxx APIs also provokes an SQLITE_CORRUPT error. </p>
+
+<p>Because the non-primary key "old.*" fields are omitted, no 
+SQLITE_CHANGESET_DATA conflicts can be detected or reported if a patchset
+is passed to the sqlite3changeset_apply() API. Other conflict types work
+in the same way as for changesets.</p>
+
+<p>Changes within a patchset are ordered in the same way as for changesets
+generated by the sqlite3session_changeset() function (i.e. all changes for
+a single table are grouped together, tables appear in the order in which
+they were attached to the session object).
+</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>
+