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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"><html><head><title>Low-Level Control Of Database Files</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>Low-Level Control Of Database Files</h2><blockquote><pre>int sqlite3_file_control(sqlite3*, const char *zDbName, int op, void*);</pre></blockquote><p> The <a href="../c3ref/file_control.html">sqlite3_file_control()</a> interface makes a direct call to thexFileControl method for the <a href="../c3ref/io_methods.html">sqlite3_io_methods</a> object associatedwith a particular database identified by the second argument. Thename of the database is the name assigned to the database by the<a href="lang_attach.html">ATTACH</a> SQL command that opened thedatabase. To control the main database file, use the name "main"or a NULL pointer. The third and fourth parameters to this routineare passed directly through to the second and third parameters ofthe xFileControl method. The return value of the xFileControlmethod becomes the return value of this routine.</p><p> If the second parameter (zDbName) does not match the name of anyopen database file, then SQLITE_ERROR is returned. This errorcode is not remembered and will not be recalled by <a href="../c3ref/errcode.html">sqlite3_errcode()</a>or <a href="../c3ref/errcode.html">sqlite3_errmsg()</a>. The underlying xFileControl method mightalso return SQLITE_ERROR. There is no way to distinguish betweenan incorrect zDbName and an SQLITE_ERROR return from the underlyingxFileControl method.</p><p>See also: <a href="../c3ref/c_fcntl_lockstate.html">SQLITE_FCNTL_LOCKSTATE</a></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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