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