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381 lines
14 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>Chapter 6. Db_multimap</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="index.html" title="Berkeley DB C++ Standard Template Library API Reference" />
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<link rel="prev" href="stldb_mapoperator_ueq.html" title="operator!=" />
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<link rel="next" href="stldb_multimaperase.html" title="erase" />
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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">Chapter 6.
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Db_multimap </th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="stldb_mapoperator_ueq.html">Prev</a> </td>
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<th width="60%" align="center"> </th>
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<td width="20%" align="right"> <a accesskey="n" href="stldb_multimaperase.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="chapter" 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"><a id="db_multimap"></a>Chapter 6.
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Db_multimap </h2>
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</div>
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</div>
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</div>
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<p>This class is the combination of std::multimap and hash_multimap. </p>
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<p>By setting database handles as DB_BTREE or DB_HASH type respectively, you will be using an equivalent of std::multimap or hash_multimap respectively. Database(dbp) and environment(penv) handle requirement: The dbp handle must meet the following requirement: 1. Database type should be DB_BTREE or DB_HASH. 2. Either DB_DUP or DB_DUPSORT flag must be set. Note that so far Berkeley DB does not allow DB_DUPSORT be set and the database is storing identical key/data pairs, i.e. we can't store two (1, 2), (1, 2) pairs into a database D with DB_DUPSORT flag set, but only can do so with DB_DUP flag set; But we can store a (1, 2) pair and a (1, 3) pair into D with DB_DUPSORT flag set. So if your data set allows DB_DUPSORT flag, you should set it to gain a lot of performance promotion. 3. No DB_RECNUM flag set. 4. No DB_TRUNCATE specified in database open flags. 5. DB_THREAD must be set if you are sharing the database handle across multiple threads directly, or indirectly by sharing the container object across multiple threads. </p>
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<h4><a id="id3522915"></a>
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See Also
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</h4>
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<p> </p>
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<p><a class="link" href="db_container.html" title="Chapter 3. Db_container">db_container</a>
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<a class="link" href="db_map.html" title="Chapter 5. Db_map">db_map</a>
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</p>
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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="id3520512"></a>
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Class Template Parameters</h3>
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</div>
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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="id3522800"></a>
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kdt</h4>
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</div>
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</div>
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</div>
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<p>The key data type. </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="id3520543"></a>
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ddt</h4>
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</div>
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</div>
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</div>
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<p>The data data type. <a class="link" href="db_multimap.html" title="Chapter 6. Db_multimap">db_multimap</a>
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stores key/data pairs. </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="id3522379"></a>
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value_type_sub</h4>
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</div>
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</div>
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</div>
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<p>Do not specify anything if ddt type is a class/struct type; Otherwise, specify ElementHolder<ddt> to it. </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="id3523813"></a>
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iterator_t</h4>
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</div>
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</div>
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</div>
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<p>Never specify anything to this type parameter. It is only used internally. </p>
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</div>
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</div>
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<h4><a id="id3515728"></a> Public Members </h4>
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<div class="informaltable">
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<table border="1" width="80%">
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<colgroup>
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<col />
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<col />
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</colgroup>
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<thead>
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<tr>
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<th>Member</th>
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<th>Description</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td>
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<a class="xref" href="db_multimap.html#stldb_multimapinsert" title="insert">insert</a>
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</td>
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<td>
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<p>Range insertion. </p> </td>
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</tr>
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<tr>
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<td>
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<a class="xref" href="stldb_multimaperase.html" title="erase">erase</a>
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</td>
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<td>
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<p>Erase elements by key. </p> </td>
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</tr>
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<tr>
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<td>
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<a class="xref" href="stldb_multimapequal_range.html" title="equal_range">equal_range</a>
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</td>
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<td>
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<p>Find the range within which all keys equal to specified key x. </p> </td>
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</tr>
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<tr>
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<td>
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<a class="xref" href="stldb_multimapequal_range_N.html" title="equal_range_N">equal_range_N</a>
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</td>
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<td>
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<p>Find equal range and number of key/data pairs in the range. </p> </td>
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</tr>
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<tr>
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<td>
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<a class="xref" href="stldb_multimapcount.html" title="count">count</a>
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</td>
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<td>
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<p>Count the number of key/data pairs having specified key x. </p> </td>
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</tr>
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<tr>
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<td>
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<a class="xref" href="stldb_multimapupper_bound.html" title="upper_bound">upper_bound</a>
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</td>
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<td>
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<p>Find the least key greater than x. </p> </td>
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</tr>
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<tr>
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<td>
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<a class="xref" href="stldb_multimapdb_multimap.html" title="db_multimap">db_multimap</a>
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</td>
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<td>
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<p>Constructor. </p> </td>
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</tr>
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<tr>
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<td>
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<a class="xref" href="stldb_multimapdstr_db_multimap.html" title="~db_multimap">~db_multimap</a>
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</td>
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<td>
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</td>
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</tr>
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<tr>
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<td>
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<a class="xref" href="stldb_multimapoperator_assign.html" title="operator=">operator=</a>
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</td>
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<td>
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<p>Container content assignment operator. </p> </td>
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</tr>
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<tr>
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<td>
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<a class="xref" href="stldb_multimapswap.html" title="swap">swap</a>
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</td>
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<td>
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<p>Swap content with another multimap container. </p> </td>
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</tr>
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<tr>
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<td>
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<a class="xref" href="stldb_multimapoperator_eq.html" title="operator==">operator==</a>
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</td>
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<td>
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<p>Returns whether the two containers have identical content. </p> </td>
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</tr>
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<tr>
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<td>
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<a class="xref" href="stldb_multimapoperator_ueq.html" title="operator!=">operator!=</a>
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</td>
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<td>
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<p>Container unequality comparison operator. </p> </td>
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</tr>
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</tbody>
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</table>
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</div>
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<h4><a id="id3523990"></a>
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Group</h4>
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<p>
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<a class="xref" href="dbstl_containers.html" title="Chapter 2. Dbstl Container Classes">
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Dbstl Container Classes </a>
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</p>
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<p>
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</p>
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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="stldb_multimapinsert"></a>insert</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="stldb_multimapinsert_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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void insert(InputIterator first,
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InputIterator last)
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</pre>
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<p>Range insertion. </p>
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<p>Insert a range [first, last) of key/data pairs into this container. </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="id3524210"></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="id3524375"></a>last</h5>
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</div>
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</div>
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</div>
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<p>The open boundary of the range. </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="id3524406"></a>first</h5>
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</div>
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</div>
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</div>
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<p>The closed boundary of the range. </p>
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</div>
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</div>
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<pre class="programlisting">
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void insert(const_iterator &first,
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const_iterator &last)
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</pre>
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<p>Range insertion. </p>
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<p>Insert a range [first, last) of key/data pairs into this container. </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="id3524414"></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="id3524417"></a>last</h5>
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</div>
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</div>
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</div>
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<p>The open boundary of the range. </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="id3524431"></a>first</h5>
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</div>
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</div>
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</div>
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<p>The closed boundary of the range. </p>
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</div>
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</div>
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<pre class="programlisting">
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iterator insert(const value_type &x)
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</pre>
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<p>Insert a single key/data pair if the key is not in the container. </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="id3524355"></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="id3524438"></a>x</h5>
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</div>
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</div>
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</div>
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<p>The key/data pair to insert. </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="id3520522"></a>Return Value</h4>
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</div>
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</div>
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</div>
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<p>A pair P, if insert OK, i.e. the inserted key wasn't in the container, P.first will be the iterator sitting on the inserted key/data pair, and P.second is true; otherwise P.first is an invalid iterator and P.second is false. </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="id3523852"></a>Group: Insert Functions</h3>
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</div>
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</div>
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</div>
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<div class="simplesect" lang="en" xml:lang="en">
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<div class="titlepage"></div>
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<p><a class="ulink" href="http://www.cplusplus.com/reference/stl/multimap/insert/" target="_top">http://www.cplusplus.com/reference/stl/multimap/insert/</a> </p>
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</div>
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<p>
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</p>
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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="id3524211"></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="db_multimap.html" title="Chapter 6. Db_multimap">db_multimap</a>
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</p>
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||
</div>
|
||
</div>
|
||
</div>
|
||
<div class="navfooter">
|
||
<hr />
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<table width="100%" summary="Navigation footer">
|
||
<tr>
|
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<td width="40%" align="left"><a accesskey="p" href="stldb_mapoperator_ueq.html">Prev</a> </td>
|
||
<td width="20%" align="center"> </td>
|
||
<td width="40%" align="right"> <a accesskey="n" href="stldb_multimaperase.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">operator!= </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"> erase</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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