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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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<title>Chapter 6. Db_multimap</title>
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<div class="libver">
<p>Library Version 11.2.5.3</p>
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<table width="100%" summary="Navigation header">
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<th colspan="3" align="center">Chapter 6.
Db_multimap </th>
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<div class="chapter" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h2 class="title"><a id="db_multimap"></a>Chapter 6.
Db_multimap </h2>
</div>
</div>
</div>
<p>This class is the combination of std::multimap and hash_multimap. </p>
<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>
<h4><a id="idp50524248"></a>
See Also
</h4>
<p> </p>
<p><a class="link" href="db_container.html" title="Chapter 3. Db_container">db_container</a>
<a class="link" href="db_map.html" title="Chapter 5. Db_map">db_map</a>
</p>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h3 class="title"><a id="idp50483208"></a>
Class Template Parameters</h3>
</div>
</div>
</div>
<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h4 class="title"><a id="idp49844168"></a>
kdt</h4>
</div>
</div>
</div>
<p>The key data type. </p>
</div>
<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h4 class="title"><a id="idp50376072"></a>
ddt</h4>
</div>
</div>
</div>
<p>The data data type. <a class="link" href="db_multimap.html" title="Chapter 6. Db_multimap">db_multimap</a>
stores key/data pairs. </p>
</div>
<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h4 class="title"><a id="idp50570784"></a>
value_type_sub</h4>
</div>
</div>
</div>
<p>Do not specify anything if ddt type is a class/struct type; Otherwise, specify ElementHolder<ddt> to it. </p>
</div>
<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h4 class="title"><a id="idp50566872"></a>
iterator_t</h4>
</div>
</div>
</div>
<p>Never specify anything to this type parameter. It is only used internally. </p>
</div>
</div>
<h4><a id="idp50573832"></a> Public Members </h4>
<div class="informaltable">
<table border="1" width="80%">
<colgroup>
<col />
<col />
</colgroup>
<thead>
<tr>
<th>Member</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td>
<a class="xref" href="db_multimap.html#stldb_multimapinsert" title="insert">insert</a>
</td>
<td>
<p>Range insertion. </p> </td>
</tr>
<tr>
<td>
<a class="xref" href="stldb_multimaperase.html" title="erase">erase</a>
</td>
<td>
<p>Erase elements by key. </p> </td>
</tr>
<tr>
<td>
<a class="xref" href="stldb_multimapequal_range.html" title="equal_range">equal_range</a>
</td>
<td>
<p>Find the range within which all keys equal to specified key x. </p> </td>
</tr>
<tr>
<td>
<a class="xref" href="stldb_multimapequal_range_N.html" title="equal_range_N">equal_range_N</a>
</td>
<td>
<p>Find equal range and number of key/data pairs in the range. </p> </td>
</tr>
<tr>
<td>
<a class="xref" href="stldb_multimapcount.html" title="count">count</a>
</td>
<td>
<p>Count the number of key/data pairs having specified key x. </p> </td>
</tr>
<tr>
<td>
<a class="xref" href="stldb_multimapupper_bound.html" title="upper_bound">upper_bound</a>
</td>
<td>
<p>Find the least key greater than x. </p> </td>
</tr>
<tr>
<td>
<a class="xref" href="stldb_multimapdb_multimap.html" title="db_multimap">db_multimap</a>
</td>
<td>
<p>Constructor. </p> </td>
</tr>
<tr>
<td>
<a class="xref" href="stldb_multimapdstr_db_multimap.html" title="~db_multimap">~db_multimap</a>
</td>
<td>
</td>
</tr>
<tr>
<td>
<a class="xref" href="stldb_multimapoperator_assign.html" title="operator=">operator=</a>
</td>
<td>
<p>Container content assignment operator. </p> </td>
</tr>
<tr>
<td>
<a class="xref" href="stldb_multimapswap.html" title="swap">swap</a>
</td>
<td>
<p>Swap content with another multimap container. </p> </td>
</tr>
<tr>
<td>
<a class="xref" href="stldb_multimapoperator_eq.html" title="operator==">operator==</a>
</td>
<td>
<p>Returns whether the two containers have identical content. </p> </td>
</tr>
<tr>
<td>
<a class="xref" href="stldb_multimapoperator_ueq.html" title="operator!=">operator!=</a>
</td>
<td>
<p>Container unequality comparison operator. </p> </td>
</tr>
</tbody>
</table>
</div>
<h4><a id="idp50081160"></a>
Group</h4>
<p>
<a class="xref" href="dbstl_containers.html" title="Chapter 2. Dbstl Container Classes">
Dbstl Container Classes </a>
</p>
<p>
</p>
<div class="sect1" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h2 class="title" style="clear: both"><a id="stldb_multimapinsert"></a>insert</h2>
</div>
</div>
</div>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h3 class="title"><a id="stldb_multimapinsert_details"></a>Function Details</h3>
</div>
</div>
</div>
<pre class="programlisting">
void insert(InputIterator first,
InputIterator last)
</pre>
<p>Range insertion. </p>
<p>Insert a range [first, last) of key/data pairs into this container. </p>
<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h4 class="title"><a id="idp50590840"></a>Parameters</h4>
</div>
</div>
</div>
<div class="sect4" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h5 class="title"><a id="idp50600672"></a>last</h5>
</div>
</div>
</div>
<p>The open boundary of the range. </p>
</div>
<div class="sect4" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h5 class="title"><a id="idp50602552"></a>first</h5>
</div>
</div>
</div>
<p>The closed boundary of the range. </p>
</div>
</div>
<pre class="programlisting">
void insert(const_iterator &first,
const_iterator &last)
</pre>
<p>Range insertion. </p>
<p>Insert a range [first, last) of key/data pairs into this container. </p>
<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h4 class="title"><a id="idp50603016"></a>Parameters</h4>
</div>
</div>
</div>
<div class="sect4" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h5 class="title"><a id="idp50603208"></a>last</h5>
</div>
</div>
</div>
<p>The open boundary of the range. </p>
</div>
<div class="sect4" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h5 class="title"><a id="idp50604048"></a>first</h5>
</div>
</div>
</div>
<p>The closed boundary of the range. </p>
</div>
</div>
<pre class="programlisting">
iterator insert(const value_type &x)
</pre>
<p>Insert a single key/data pair if the key is not in the container. </p>
<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h4 class="title"><a id="idp50599464"></a>Parameters</h4>
</div>
</div>
</div>
<div class="sect4" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h5 class="title"><a id="idp50604496"></a>x</h5>
</div>
</div>
</div>
<p>The key/data pair to insert. </p>
</div>
</div>
<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h4 class="title"><a id="idp50370072"></a>Return Value</h4>
</div>
</div>
</div>
<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>
</div>
</div>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h3 class="title"><a id="idp50569336"></a>Group: Insert Functions</h3>
</div>
</div>
</div>
<div class="simplesect" lang="en" xml:lang="en">
<div class="titlepage"></div>
<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>
</div>
<p>
</p>
</div>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h3 class="title"><a id="idp50600336"></a>Class</h3>
</div>
</div>
</div>
<p>
<a class="link" href="db_multimap.html" title="Chapter 6. Db_multimap">db_multimap</a>
</p>
</div>
</div>
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