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<title>Interrupt A Long-Running Query</title>
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<a href="intro.html"><h2>SQLite C Interface</h2></a>
<h2>Interrupt A Long-Running Query</h2>
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<blockquote><pre>
void sqlite3_interrupt(sqlite3*);
</pre></blockquote>
<p>
This function causes any pending database operation to abort and
return at its earliest opportunity. This routine is typically
called in response to a user action such as pressing "Cancel"
or Ctrl-C where the user wants a long query operation to halt
immediately.</p>
<p>It is safe to call this routine from a thread different from the
thread that is currently running the database operation. But it
is not safe to call this routine with a <a href="../c3ref/sqlite3.html">database connection</a> that
is closed or might close before sqlite3_interrupt() returns.</p>
<p>If an SQL operation is very nearly finished at the time when
sqlite3_interrupt() is called, then it might not have an opportunity
to be interrupted and might continue to completion.</p>
<p>An SQL operation that is interrupted will return <a href="../rescode.html#interrupt">SQLITE_INTERRUPT</a>.
If the interrupted SQL operation is an INSERT, UPDATE, or DELETE
that is inside an explicit transaction, then the entire transaction
will be rolled back automatically.</p>
<p>The sqlite3_interrupt(D) call is in effect until all currently running
SQL statements on <a href="../c3ref/sqlite3.html">database connection</a> D complete. Any new SQL statements
that are started after the sqlite3_interrupt() call and before the
running statements reaches zero are interrupted as if they had been
running prior to the sqlite3_interrupt() call. New SQL statements
that are started after the running statement count reaches zero are
not effected by the sqlite3_interrupt().
A call to sqlite3_interrupt(D) that occurs when there are no running
SQL statements is a no-op and has no effect on SQL statements
that are started after the sqlite3_interrupt() call returns.</p>
<p>If the database connection closes while <a href="../c3ref/interrupt.html">sqlite3_interrupt()</a>
is running then bad things will likely happen.
</p><p>See also lists of
<a href="objlist.html">Objects</a>,
<a href="constlist.html">Constants</a>, and
<a href="funclist.html">Functions</a>.</p>
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