121 lines
4.4 KiB
HTML
121 lines
4.4 KiB
HTML
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<a href="intro.html"><h2>SQLite C Interface</h2></a>
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<h2>Number of columns in a result set</h2>
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</div>
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<blockquote><pre>
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int sqlite3_data_count(sqlite3_stmt *pStmt);
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</pre></blockquote>
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<p>
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The sqlite3_data_count(P) interface returns the number of columns in the
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current row of the result set of <a href="../c3ref/stmt.html">prepared statement</a> P.
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If prepared statement P does not have results ready to return
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(via calls to the <a href="../c3ref/column_blob.html">sqlite3_column()</a> family of
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interfaces) then sqlite3_data_count(P) returns 0.
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The sqlite3_data_count(P) routine also returns 0 if P is a NULL pointer.
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The sqlite3_data_count(P) routine returns 0 if the previous call to
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<a href="../c3ref/step.html">sqlite3_step</a>(P) returned <a href="../rescode.html#done">SQLITE_DONE</a>. The sqlite3_data_count(P)
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will return non-zero if previous call to <a href="../c3ref/step.html">sqlite3_step</a>(P) returned
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<a href="../rescode.html#row">SQLITE_ROW</a>, except in the case of the <a href="../pragma.html#pragma_incremental_vacuum">PRAGMA incremental_vacuum</a>
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where it always returns zero since each step of that multi-step
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pragma returns 0 columns of data.</p>
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<p>See also: <a href="../c3ref/column_count.html">sqlite3_column_count()</a>
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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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