127 lines
4.4 KiB
HTML
127 lines
4.4 KiB
HTML
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<a href="intro.html"><h2>Session Module C Interface</h2></a><h2>Invert A Changeset</h2><blockquote><pre>int sqlite3changeset_invert(
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int nIn, const void *pIn, /* Input changeset */
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int *pnOut, void **ppOut /* OUT: Inverse of input */
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);
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</pre></blockquote><p>
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This function is used to "invert" a changeset object. Applying an inverted
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changeset to a database reverses the effects of applying the uninverted
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changeset. Specifically:</p>
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<p><ul>
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<li> Each DELETE change is changed to an INSERT, and
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<li> Each INSERT change is changed to a DELETE, and
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<li> For each UPDATE change, the old.* and new.* values are exchanged.
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</ul></p>
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<p>This function does not change the order in which changes appear within
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the changeset. It merely reverses the sense of each individual change.</p>
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<p>If successful, a pointer to a buffer containing the inverted changeset
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is stored in *ppOut, the size of the same buffer is stored in *pnOut, and
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SQLITE_OK is returned. If an error occurs, both *pnOut and *ppOut are
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zeroed and an SQLite error code returned.</p>
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<p>It is the responsibility of the caller to eventually call sqlite3_free()
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on the *ppOut pointer to free the buffer allocation following a successful
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call to this function.</p>
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<p>WARNING/TODO: This function currently assumes that the input is a valid
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changeset. If it is not, the results are undefined.
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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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