158 lines
6.0 KiB
HTML
158 lines
6.0 KiB
HTML
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<!-- keywords: sqlite3_changes -->
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<a href="intro.html"><h2>SQLite C Interface</h2></a>
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<h2>Count The Number Of Rows Modified</h2>
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</div>
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<blockquote><pre>
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int sqlite3_changes(sqlite3*);
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</pre></blockquote>
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<p>
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This function returns the number of rows modified, inserted or
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deleted by the most recently completed INSERT, UPDATE or DELETE
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statement on the database connection specified by the only parameter.
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Executing any other type of SQL statement does not modify the value
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returned by this function.</p>
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<p>Only changes made directly by the INSERT, UPDATE or DELETE statement are
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considered - auxiliary changes caused by <a href="../lang_createtrigger.html">triggers</a>,
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<a href="../foreignkeys.html#fk_actions">foreign key actions</a> or <a href="../lang_replace.html">REPLACE</a> constraint resolution are not counted.</p>
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<p>Changes to a view that are intercepted by
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<a href="../lang_createtrigger.html#instead_of_trigger">INSTEAD OF triggers</a> are not counted. The value
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returned by sqlite3_changes() immediately after an INSERT, UPDATE or
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DELETE statement run on a view is always zero. Only changes made to real
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tables are counted.</p>
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<p>Things are more complicated if the sqlite3_changes() function is
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executed while a trigger program is running. This may happen if the
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program uses the <a href="../lang_corefunc.html#changes">changes() SQL function</a>, or if some other callback
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function invokes sqlite3_changes() directly. Essentially:</p>
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<p><ul>
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<li> Before entering a trigger program the value returned by
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sqlite3_changes() function is saved. After the trigger program
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has finished, the original value is restored.</p>
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<p><li> Within a trigger program each INSERT, UPDATE and DELETE
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statement sets the value returned by sqlite3_changes()
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upon completion as normal. Of course, this value will not include
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any changes performed by sub-triggers, as the sqlite3_changes()
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value will be saved and restored after each sub-trigger has run.
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</ul></p>
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<p>This means that if the changes() SQL function (or similar) is used
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by the first INSERT, UPDATE or DELETE statement within a trigger, it
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returns the value as set when the calling statement began executing.
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If it is used by the second or subsequent such statement within a trigger
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program, the value returned reflects the number of rows modified by the
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previous INSERT, UPDATE or DELETE statement within the same trigger.</p>
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<p>If a separate thread makes changes on the same database connection
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while <a href="../c3ref/changes.html">sqlite3_changes()</a> is running then the value returned
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is unpredictable and not meaningful.</p>
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<p>See also:
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<ul>
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<li> the <a href="../c3ref/total_changes.html">sqlite3_total_changes()</a> interface
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<li> the <a href="../pragma.html#pragma_count_changes">count_changes pragma</a>
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<li> the <a href="../lang_corefunc.html#changes">changes() SQL function</a>
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<li> the <a href="../pragma.html#pragma_data_version">data_version pragma</a>
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</ul>
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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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