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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"><html><head><title>Enable Or Disable Shared Pager Cache</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>Enable Or Disable Shared Pager Cache</h2><blockquote><pre>int sqlite3_enable_shared_cache(int);</pre></blockquote><p>This routine enables or disables the sharing of the database cacheand schema data structures between connections to the same database.Sharing is enabled if the argument is true and disabled if the argumentis false.</p><p>Cache sharing is enabled and disabledfor an entire process. This is a change as of SQLite version 3.5.0.In prior versions of SQLite, sharing wasenabled or disabled for each thread separately.</p><p>The cache sharing mode set by this interface effects all subsequentcalls to <a href="../c3ref/open.html">sqlite3_open()</a>, <a href="../c3ref/open.html">sqlite3_open_v2()</a>, and <a href="../c3ref/open.html">sqlite3_open16()</a>.Existing database connections continue use the sharing modethat was in effect at the time they were opened.</p><p>Virtual tables cannot be used with a shared cache. When sharedcache is enabled, the <a href="../c3ref/create_module.html">sqlite3_create_module()</a> API used to registervirtual tables will always return an error.</p><p>This routine returns <a href="../c3ref/c_abort.html">SQLITE_OK</a> if shared cache wasenabled or disabled successfully. An <a href="../c3ref/c_abort.html">error code</a>is returned otherwise.</p><p>Shared cache is disabled by default. But this might change infuture releases of SQLite. Applications that care about sharedcache setting should set it explicitly.</p><p><h3>Invariants:</h3><table border="0" cellpadding="5" cellspacing="0"><tr><td valign="top">F10331</td> <td valign="top">A successful invocation of <a href="../c3ref/enable_shared_cache.html">sqlite3_enable_shared_cache(B)</a>will enable or disable shared cache mode for any subsequentlycreated <a href="../c3ref/sqlite3.html">database connection</a> in the same process.</td></tr><tr><td valign="top">F10336</td> <td valign="top">When shared cache is enabled, the <a href="../c3ref/create_module.html">sqlite3_create_module()</a>interface will always return an error.</td></tr><tr><td valign="top">F10337</td> <td valign="top">The <a href="../c3ref/enable_shared_cache.html">sqlite3_enable_shared_cache(B)</a> interface returns<a href="../c3ref/c_abort.html">SQLITE_OK</a> if shared cache was enabled or disabled successfully.</td></tr><tr><td valign="top">F10339</td> <td valign="top">Shared cache is disabled by default.</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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