📄 db_config.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"><html><head><title>Configure database connections</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>Configure database connections</h2><blockquote><pre>int sqlite3_db_config(sqlite3*, int op, ...);</pre></blockquote><p><b>Important:</b> This interface is <a href="../c3ref/experimental.html">experimental</a> and is subject to change without notice.</p><p>The sqlite3_db_config() interface is used to make configurationchanges to a <a href="../c3ref/sqlite3.html">database connection</a>. The interface is similar to<a href="../c3ref/config.html">sqlite3_config()</a> except that the changes apply to a single<a href="../c3ref/sqlite3.html">database connection</a> (specified in the first argument). Thesqlite3_db_config() interface can only be used immediately afterthe database connection is created using <a href="../c3ref/open.html">sqlite3_open()</a>,<a href="../c3ref/open.html">sqlite3_open16()</a>, or <a href="../c3ref/open.html">sqlite3_open_v2()</a>.</p><p>The second argument to sqlite3_db_config(D,V,...) is theconfiguration verb - an integer code that indicates whataspect of the <a href="../c3ref/sqlite3.html">database connection</a> is being configured.The only choice for this value is <a href="../c3ref/c_dbconfig_lookaside.html">SQLITE_DBCONFIG_LOOKASIDE</a>.New verbs are likely to be added in future releases of SQLite.Additional arguments depend on the verb.</p><p><h3>Invariants:</h3><table border="0" cellpadding="5" cellspacing="0"><tr><td valign="top">H14203</td> <td valign="top">A call to <a href="../c3ref/db_config.html">sqlite3_db_config(D,V,...)</a> shall return <a href="../c3ref/c_abort.html">SQLITE_OK</a>if and only if the call is successful.</td></tr><tr><td valign="top">H14206</td> <td valign="top">If one or more slots of the <a href="../malloc.html#lookaside">lookaside memory allocator</a> for<a href="../c3ref/sqlite3.html">database connection</a> D are in use, then a call to<a href="../c3ref/db_config.html">sqlite3_db_config</a>(D,<a href="../c3ref/c_dbconfig_lookaside.html">SQLITE_DBCONFIG_LOOKASIDE</a>,...) shallfail with an <a href="../c3ref/c_abort.html">SQLITE_BUSY</a> return code.</td></tr><tr><td valign="top">H14209</td> <td valign="top">A successful call to<a href="../c3ref/db_config.html">sqlite3_db_config</a>(D,<a href="../c3ref/c_dbconfig_lookaside.html">SQLITE_DBCONFIG_LOOKASIDE</a>,B,Z,N) whereD is an open <a href="../c3ref/sqlite3.html">database connection</a> and Z and N are positiveintegers and B is an aligned buffer at least Z*N bytes in sizeshall cause the <a href="../malloc.html#lookaside">lookaside memory allocator</a> for D to use buffer Bwith N slots of Z bytes each.</td></tr><tr><td valign="top">H14212</td> <td valign="top">A successful call to<a href="../c3ref/db_config.html">sqlite3_db_config</a>(D,<a href="../c3ref/c_dbconfig_lookaside.html">SQLITE_DBCONFIG_LOOKASIDE</a>,B,Z,N) whereD is an open <a href="../c3ref/sqlite3.html">database connection</a> and Z and N are positiveintegers and B is NULL pointer shall cause the<a href="../malloc.html#lookaside">lookaside memory allocator</a> for D to a obtain Z*N byte bufferfrom the primary memory allocator and use that bufferwith N lookaside slots of Z bytes each.</td></tr><tr><td valign="top">H14215</td> <td valign="top">A successful call to<a href="../c3ref/db_config.html">sqlite3_db_config</a>(D,<a href="../c3ref/c_dbconfig_lookaside.html">SQLITE_DBCONFIG_LOOKASIDE</a>,B,Z,N) whereD is an open <a href="../c3ref/sqlite3.html">database connection</a> and Z and N are zero shalldisable the <a href="../malloc.html#lookaside">lookaside memory allocator</a> for D.</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 2008/12/09 18:44:04 UTC</i></small></div></body></html>⌨️ 快捷键说明
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