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<a href="../session/intro.html"><h2>Session Module C Interface</h2></a><h2>Obtain The Primary Key Definition Of A Table</h2><blockquote><pre>int sqlite3changeset_pk(
sqlite3_changeset_iter *pIter, /* Iterator object */
unsigned char **pabPK, /* OUT: Array of boolean - true for PK cols */
int *pnCol /* OUT: Number of entries in output array */
);
</pre></blockquote><p>
For each modified table, a changeset includes the following:</p>
<p><ul>
<li> The number of columns in the table, and
<li> Which of those columns make up the tables PRIMARY KEY.
</ul></p>
<p>This function is used to find which columns comprise the PRIMARY KEY of
the table modified by the change that iterator pIter currently points to.
If successful, *pabPK is set to point to an array of nCol entries, where
nCol is the number of columns in the table. Elements of *pabPK are set to
0x01 if the corresponding column is part of the tables primary key, or
0x00 if it is not.</p>
<p>If argument pnCol is not NULL, then *pnCol is set to the number of columns
in the table.</p>
<p>If this function is called when the iterator does not point to a valid
entry, SQLITE_MISUSE is returned and the output variables zeroed. Otherwise,
SQLITE_OK is returned and the output variables populated as described
above.
</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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