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191 lines
7.4 KiB
HTML
191 lines
7.4 KiB
HTML
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
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<title>open_env</title>
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<link rel="stylesheet" href="apiReference.css" type="text/css" />
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<meta name="generator" content="DocBook XSL Stylesheets V1.73.2" />
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<link rel="start" href="index.html" title="Berkeley DB C++ Standard Template Library API Reference" />
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<link rel="up" href="dbstl_global_functions.html" title="Chapter 1. Dbstl Global Public Functions" />
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<link rel="prev" href="stldbstl_global_functionsopen_db.html" title="open_db" />
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<link rel="next" href="stldbstl_global_functionsalloc_mutex.html" title="alloc_mutex" />
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</head>
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<body>
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<div xmlns="" class="navheader">
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<div class="libver">
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<p>Library Version 11.2.5.2</p>
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</div>
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<table width="100%" summary="Navigation header">
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<tr>
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<th colspan="3" align="center">open_env</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="stldbstl_global_functionsopen_db.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 1.
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Dbstl Global Public Functions </th>
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<td width="20%" align="right"> <a accesskey="n" href="stldbstl_global_functionsalloc_mutex.html">Next</a></td>
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</tr>
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</table>
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<hr />
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</div>
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<div class="sect1" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h2 class="title" style="clear: both"><a id="stldbstl_global_functionsopen_env"></a>open_env</h2>
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</div>
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</div>
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</div>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h3 class="title"><a id="stldbstl_global_functionsopen_env_details"></a>Function Details</h3>
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</div>
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</div>
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</div>
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<pre class="programlisting">
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DbEnv* open_env(const char *env_home, u_int32_t set_flags,
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u_int32_t oflags=DB_CREATE|DB_INIT_MPOOL,
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u_int32_t cachesize=4 *1024 *1024, int mode=0644,
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u_int32_t cflags=0)
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</pre>
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<p>Helper function to open an environment and register it into dbstl for the calling thread. </p>
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<p>Users still need to register it in any other thread if it is shared by multiple threads, via <a class="link" href="stldbstl_global_functionsregister_db_env.html" title="register_db_env">register_db_env()</a>
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function above. Users don't need to delete or free the memory of the returned object, dbstl will take care of that.</p>
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<p>When you don't use <a class="link" href="stldbstl_global_functionsopen_env.html" title="open_env">dbstl::open_env()</a>
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but explicitly call DB C++ API to open an environment, you must new the DbEnv object, rather than create it on stack, and you must delete the DbEnv object by yourself. </p>
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<div class="sect3" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h4 class="title"><a id="id3513677"></a>Parameters</h4>
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</div>
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</div>
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</div>
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<div class="sect4" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h5 class="title"><a id="id3513680"></a>oflags</h5>
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</div>
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</div>
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</div>
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<p>Environment open flags, passed to DbEnv::open. </p>
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</div>
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<div class="sect4" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h5 class="title"><a id="id3513712"></a>set_flags</h5>
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</div>
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</div>
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</div>
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<p>Flags to set to the created environment before opening it. </p>
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</div>
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<div class="sect4" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h5 class="title"><a id="id3513718"></a>mode</h5>
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</div>
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</div>
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</div>
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<p>Environment region files mode, passed to DbEnv::open. </p>
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</div>
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<div class="sect4" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h5 class="title"><a id="id3513724"></a>cflags</h5>
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</div>
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</div>
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</div>
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<p>DbEnv constructor creation flags, passed to DbEnv::DbEnv. </p>
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</div>
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<div class="sect4" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h5 class="title"><a id="id3513731"></a>cachesize</h5>
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</div>
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</div>
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</div>
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<p>Environment cache size, by default 4M bytes. </p>
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</div>
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<div class="sect4" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h5 class="title"><a id="id3513736"></a>env_home</h5>
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</div>
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</div>
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</div>
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<p>Environment home directory, it must exist. Passed to DbEnv::open. </p>
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</div>
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</div>
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<div class="sect3" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h4 class="title"><a id="id3513656"></a>Return Value</h4>
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</div>
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</div>
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</div>
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<p>The opened database environment handle. </p>
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</div>
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<div class="sect3" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h4 class="title"><a id="id3513743"></a>See Also</h4>
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</div>
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</div>
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</div>
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<p>
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</p>
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<p><a class="link" href="stldbstl_global_functionsregister_db_env.html" title="register_db_env">register_db_env(DbEnv *)</a>
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; </p>
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<p>
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</p>
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<p><a class="link" href="stldbstl_global_functionsopen_db.html" title="open_db">open_db</a>
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; </p>
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<p>
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</p>
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</div>
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</div>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h3 class="title"><a id="id3513427"></a>Class</h3>
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</div>
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</div>
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</div>
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<p>
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<a class="link" href="dbstl_global_functions.html" title="Chapter 1. Dbstl Global Public Functions">dbstl_global_functions</a>
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</p>
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</div>
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</div>
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<div class="navfooter">
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<hr />
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<table width="100%" summary="Navigation footer">
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<tr>
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<td width="40%" align="left"><a accesskey="p" href="stldbstl_global_functionsopen_db.html">Prev</a> </td>
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<td width="20%" align="center">
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<a accesskey="u" href="dbstl_global_functions.html">Up</a>
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</td>
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<td width="40%" align="right"> <a accesskey="n" href="stldbstl_global_functionsalloc_mutex.html">Next</a></td>
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</tr>
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<tr>
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<td width="40%" align="left" valign="top">open_db </td>
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<td width="20%" align="center">
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<a accesskey="h" href="index.html">Home</a>
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</td>
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<td width="40%" align="right" valign="top"> alloc_mutex</td>
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</tr>
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</table>
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</div>
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</body>
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</html>
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