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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"><html><head><title>Interrupt A Long-Running Query</title><style type="text/css">body { margin: auto; font-family: "Verdana" "sans-serif"; padding: 8px 1%;}a { color: #45735f }a:visited { color: #734559 }.logo { position:absolute; margin:3px; }.tagline { float:right; text-align:right; font-style:italic; width:240px; margin:12px; margin-top:58px;}.toolbar { font-variant: small-caps; text-align: center; line-height: 1.6em; margin: 0; padding:1px 8px;}.toolbar a { color: white; text-decoration: none; padding: 6px 12px; }.toolbar a:visited { color: white; }.toolbar a:hover { color: #80a796; background: white; }.content { margin: 5%; }.content dt { font-weight:bold; }.content dd { margin-bottom: 25px; margin-left:20%; }.content ul { padding:0px; padding-left: 15px; margin:0px; }/* rounded corners */.se { background: url(../images/se.png) 100% 100% no-repeat #80a796}.sw { background: url(../images/sw.png) 0% 100% no-repeat }.ne { background: url(../images/ne.png) 100% 0% no-repeat }.nw { background: url(../images/nw.png) 0% 0% no-repeat }</style><meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head><body><div><!-- container div to satisfy validator --><a href="../index.html"><img class="logo" src="../images/SQLite.gif" alt="SQLite Logo" border="0"></a><div><!-- IE hack to prevent disappearing logo--></div><div class="tagline">Small. Fast. Reliable.<br>Choose any three.</div><table width=100% style="clear:both"><tr><td> <div class="se"><div class="sw"><div class="ne"><div class="nw"> <div class="toolbar"> <a href="../about.html">About</a> <a href="../sitemap.html">Sitemap</a> <a href="../docs.html">Documentation</a> <a href="../download.html">Download</a> <a href="../copyright.html">License</a> <a href="../news.html">News</a> <a href="http://www.sqlite.org/cvstrac/index">Developers</a> <a href="../support.html">Support</a> </div></div></div></div></div></td></tr></table> <a href="intro.html"><h2>SQLite C Interface</h2></a><h2>Interrupt A Long-Running Query</h2><blockquote><pre>void sqlite3_interrupt(sqlite3*);</pre></blockquote><p>This function causes any pending database operation to abort andreturn at its earliest opportunity. This routine is typicallycalled in response to a user action such as pressing "Cancel"or Ctrl-C where the user wants a long query operation to haltimmediately.</p><p>It is safe to call this routine from a thread different from thethread that is currently running the database operation. But itis not safe to call this routine with a database connection thatis closed or might close before sqlite3_interrupt() returns.</p><p>If an SQL is very nearly finished at the time when sqlite3_interrupt()is called, then it might not have an opportunity to be interrupted.It might continue to completion.An SQL operation that is interrupted will return<a href="../c3ref/c_abort.html">SQLITE_INTERRUPT</a>. If the interrupted SQL operation is anINSERT, UPDATE, or DELETE that is inside an explicit transaction,then the entire transaction will be rolled back automatically.A call to sqlite3_interrupt() has no effect on SQL statementsthat are started after sqlite3_interrupt() returns.</p><p><h3>Invariants:</h3><table border="0" cellpadding="5" cellspacing="0"><tr><td valign="top">F12271</td> <td valign="top">The <a href="../c3ref/interrupt.html">sqlite3_interrupt()</a> interface will force all runningSQL statements associated with the same database connectionto halt after processing at most one additional row ofdata.</td></tr><tr><td valign="top">F12272</td> <td valign="top">Any SQL statement that is interrupted by <a href="../c3ref/interrupt.html">sqlite3_interrupt()</a>will return <a href="../c3ref/c_abort.html">SQLITE_INTERRUPT</a>.</td></tr></table></p><p><h3>Limitations:</h3><table border="0" cellpadding="5" cellspacing="0"><tr><td valign="top">U12279</td> <td valign="top">If the database connection closes while <a href="../c3ref/interrupt.html">sqlite3_interrupt()</a>is running then bad things will likely happen.</td></tr></table></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><hr><small><i>This page last modified 2008/02/21 17:46:11 UTC</i></small></div></body></html>?? 快捷鍵說明
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