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