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<a href="../session/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="../session/objlist.html">Objects</a>,
<a href="../session/constlist.html">Constants</a>, and
<a href="../session/funclist.html">Functions</a>.</p>
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