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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"><html><head><title>Tracing And Profiling Functions</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>Tracing And Profiling Functions</h2><blockquote><pre>void *sqlite3_trace(sqlite3*, void(*xTrace)(void*,const char*), void*);void *sqlite3_profile(sqlite3*, void(*xProfile)(void*,const char*,sqlite3_uint64), void*);</pre></blockquote><p>These routines register callback functions that can be used fortracing and profiling the execution of SQL statements.</p><p>The callback function registered by sqlite3_trace() is invoked atvarious times when an SQL statement is being run by <a href="../c3ref/step.html">sqlite3_step()</a>.The callback returns a UTF-8 rendering of the SQL statement textas the statement first begins executing. Additional callbacks occuras each triggersubprogram is entered. The callbacks for triggerscontain a UTF-8 SQL comment that identifies the trigger.</p><p>The callback function registered by sqlite3_profile() is invokedas each SQL statement finishes. The profile callback containsthe original statement text and an estimate of wall-clock timeof how long that statement took to run.</p><p>The sqlite3_profile() API is currently considered experimental andis subject to change or removal in a future release.</p><p>The trigger reporting feature of the trace callback is consideredexperimental and is subject to change or removal in future releases.Future versions of SQLite might also add new trace callbackinvocations.</p><p><h3>Invariants:</h3><table border="0" cellpadding="5" cellspacing="0"><tr><td valign="top">F12281</td> <td valign="top">The callback function registered by <a href="../c3ref/profile.html">sqlite3_trace()</a> iswhenever an SQL statement first begins to execute andwhenever a trigger subprogram first begins to run.</td></tr><tr><td valign="top">F12282</td> <td valign="top">Each call to <a href="../c3ref/profile.html">sqlite3_trace()</a> overrides the previouslyregistered trace callback.</td></tr><tr><td valign="top">F12283</td> <td valign="top">A NULL trace callback disables tracing.</td></tr><tr><td valign="top">F12284</td> <td valign="top">The first argument to the trace callback is a copy ofthe pointer which was the 3rd argument to <a href="../c3ref/profile.html">sqlite3_trace()</a>.</td></tr><tr><td valign="top">F12285</td> <td valign="top">The second argument to the trace callback is azero-terminated UTF8 string containing the original textof the SQL statement as it was passed into <a href="../c3ref/prepare.html">sqlite3_prepare_v2()</a>or the equivalent, or an SQL comment indicating the beginningof a trigger subprogram.</td></tr><tr><td valign="top">F12287</td> <td valign="top">The callback function registered by <a href="../c3ref/profile.html">sqlite3_profile()</a> is invokedas each SQL statement finishes.</td></tr><tr><td valign="top">F12288</td> <td valign="top">The first parameter to the profile callback is a copy ofthe 3rd parameter to <a href="../c3ref/profile.html">sqlite3_profile()</a>.</td></tr><tr><td valign="top">F12289</td> <td valign="top">The second parameter to the profile callback is azero-terminated UTF-8 string that contains the complete text ofthe SQL statement as it was processed by <a href="../c3ref/prepare.html">sqlite3_prepare_v2()</a>or the equivalent.</td></tr><tr><td valign="top">F12290</td> <td valign="top">The third parameter to the profile callback is an estimateof the number of nanoseconds of wall-clock time required torun the SQL statement from start to finish.</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 2008/05/12 13:08:44 UTC</i></small></div></body></html>⌨️ 快捷键说明
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