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<title>Chapter 7. Standard Template Library API</title>
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<div class="titlepage">
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<h2 class="title"><a id="stl"></a>Chapter 7. Standard Template Library API</h2>
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</div>
</div>
<div class="toc">
<p>
<b>Table of Contents</b>
</p>
<dl>
<dt>
<span class="sect1">
<a href="stl.html#stl_intro">Dbstl introduction</a>
</span>
</dt>
<dd>
<dl>
<dt>
<span class="sect2">
<a href="stl.html#stl_intro_stdcompat">Standards compatible</a>
</span>
</dt>
<dt>
<span class="sect2">
<a href="stl.html#stl_intro_performance">Performance
overhead</a>
</span>
</dt>
<dt>
<span class="sect2">
<a href="stl.html#stl_intro_portability">Portability</a>
</span>
</dt>
</dl>
</dd>
<dt>
<span class="sect1">
<a href="stl_usecase.html">Dbstl typical use cases</a>
</span>
</dt>
<dt>
<span class="sect1">
<a href="stl_examples.html">Dbstl examples</a>
</span>
</dt>
<dt>
<span class="sect1">
<a href="stl_db_usage.html">Berkeley DB configuration</a>
</span>
</dt>
<dd>
<dl>
<dt>
<span class="sect2">
<a href="stl_db_usage.html#idm140654539529920">Registering database and environment handles</a>
</span>
</dt>
<dt>
<span class="sect2">
<a href="stl_db_usage.html#idm140654539486176">Truncate requirements</a>
</span>
</dt>
<dt>
<span class="sect2">
<a href="stl_db_usage.html#idm140654539463888">Auto commit support</a>
</span>
</dt>
<dt>
<span class="sect2">
<a href="stl_db_usage.html#idm140654539460368">Database and environment identity checks</a>
</span>
</dt>
<dt>
<span class="sect2">
<a href="stl_db_usage.html#idm140654539456928">Products, constructors and configurations</a>
</span>
</dt>
</dl>
</dd>
<dt>
<span class="sect1">
<a href="stl_db_advanced_usage.html">Using advanced Berkeley DB
features with dbstl</a>
</span>
</dt>
<dd>
<dl>
<dt>
<span class="sect2">
<a href="stl_db_advanced_usage.html#idm140654539553920">Using bulk retrieval iterators</a>
</span>
</dt>
<dt>
<span class="sect2">
<a href="stl_db_advanced_usage.html#idm140654539549136">Using the DB_RMW flag</a>
</span>
</dt>
<dt>
<span class="sect2">
<a href="stl_db_advanced_usage.html#idm140654539451488">Using secondary index database and secondary containers</a>
</span>
</dt>
</dl>
</dd>
<dt>
<span class="sect1">
<a href="stl_txn_usage.html">Using transactions in dbstl</a>
</span>
</dt>
<dt>
<span class="sect1">
<a href="stl_mt_usage.html">Using dbstl in multithreaded
applications</a>
</span>
</dt>
<dt>
<span class="sect1">
<a href="stl_primitive_rw.html">Working with primitive types </a>
</span>
</dt>
<dd>
<dl>
<dt>
<span class="sect2">
<a href="stl_primitive_rw.html#idm140654539374368">Storing strings</a>
</span>
</dt>
</dl>
</dd>
<dt>
<span class="sect1">
<a href="stl_complex_rw.html">Store and Retrieve data or
objects of complex types </a>
</span>
</dt>
<dd>
<dl>
<dt>
<span class="sect2">
<a href="stl_complex_rw.html#idm140654539388944">Storing varying length objects</a>
</span>
</dt>
<dt>
<span class="sect2">
<a href="stl_complex_rw.html#idm140654539358272">Storing arbitrary sequences</a>
</span>
</dt>
<dt>
<span class="sect2">
<a href="stl_complex_rw.html#idm140654539268320">Notes</a>
</span>
</dt>
</dl>
</dd>
<dt>
<span class="sect1">
<a href="stl_persistence.html">Dbstl persistence</a>
</span>
</dt>
<dd>
<dl>
<dt>
<span class="sect2">
<a href="stl_persistence.html#directdbget">Direct database get</a>
</span>
</dt>
<dt>
<span class="sect2">
<a href="stl_persistence.html#chg_persistence">Change persistence</a>
</span>
</dt>
<dt>
<span class="sect2">
<a href="stl_persistence.html#obj_life_persistence">Object life time and persistence </a>
</span>
</dt>
</dl>
</dd>
<dt>
<span class="sect1">
<a href="stl_container_specific.html">Dbstl container specific
notes</a>
</span>
</dt>
<dd>
<dl>
<dt>
<span class="sect2">
<a href="stl_container_specific.html#idm140654539330192">db_vector specific notes</a>
</span>
</dt>
<dt>
<span class="sect2">
<a href="stl_container_specific.html#idm140654539204112">Associative container specific notes</a>
</span>
</dt>
</dl>
</dd>
<dt>
<span class="sect1">
<a href="stl_efficienct_use.html">Using dbstl
efficiently</a>
</span>
</dt>
<dd>
<dl>
<dt>
<span class="sect2">
<a href="stl_efficienct_use.html#idm140654539256448">Using iterators efficiently</a>
</span>
</dt>
<dt>
<span class="sect2">
<a href="stl_efficienct_use.html#idm140654539372592">Using containers efficiently</a>
</span>
</dt>
</dl>
</dd>
<dt>
<span class="sect1">
<a href="stl_memory_mgmt.html">Dbstl memory management</a>
</span>
</dt>
<dd>
<dl>
<dt>
<span class="sect2">
<a href="stl_memory_mgmt.html#idm140654539144272">Freeing memory</a>
</span>
</dt>
<dt>
<span class="sect2">
<a href="stl_memory_mgmt.html#idm140654539118560">Type specific notes</a>
</span>
</dt>
</dl>
</dd>
<dt>
<span class="sect1">
<a href="stl_misc.html">Dbstl miscellaneous notes</a>
</span>
</dt>
<dd>
<dl>
<dt>
<span class="sect2">
<a href="stl_misc.html#idm140654539192224">Special notes about trivial methods</a>
</span>
</dt>
<dt>
<span class="sect2">
<a href="stl_misc.html#idm140654539200592">Using correct container and iterator public
types</a>
</span>
</dt>
</dl>
</dd>
<dt>
<span class="sect1">
<a href="stl_known_issues.html">Dbstl known issues</a>
</span>
</dt>
</dl>
</div>
<div class="sect1" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h2 class="title" style="clear: both"><a id="stl_intro"></a>Dbstl introduction</h2>
</div>
</div>
</div>
<div class="toc">
<dl>
<dt>
<span class="sect2">
<a href="stl.html#stl_intro_stdcompat">Standards compatible</a>
</span>
</dt>
<dt>
<span class="sect2">
<a href="stl.html#stl_intro_performance">Performance
overhead</a>
</span>
</dt>
<dt>
<span class="sect2">
<a href="stl.html#stl_intro_portability">Portability</a>
</span>
</dt>
</dl>
</div>
<p>
Dbstl is a C++ STL style API that provides for Berkeley DB
usage. It allows for the storage and retrieval of data/objects
of any type using Berkeley DB databases, but with an interface
that mimics that of C++ STL containers. Dbstl provides access
to all of the functionality of Berkeley DB available via this
STL-style API.
</p>
<p>
With proper configuration, dbstl is able to store/retrieve
any complex data types. There is no need to perform repetitive
marshalling and unmarshalling of data. Dbstl also properly
manages the life-cycle of all Berkeley DB structures and
objects. All example methods referred to in this chapter can
be found in the StlAdvancedFeaturesExample class in the
$DbSrc/examples/stl/StlAdvancedFeatures.cpp file, and you can
build the example in $DbSrc/build_unix directory like this:
make exstl_advancedfeatures, where DbSrc is the source
directory for Berkeley DB.
</p>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h3 class="title"><a id="stl_intro_stdcompat"></a>Standards compatible</h3>
</div>
</div>
</div>
<p>
Dbstl is composed of many container and iterator class
templates. These containers and iterators correspond
exactly to each container and iterator available in the
C++ STL API, including identical sets of methods. This
allows existing algorithms, functions and
container-adapters for C++ STL to use dbstl containers
through its standard iterators. This means that existing
STL code can manipulate Berkeley DB databases. As a
result, existing C++ STL code can very easily use dbstl to
gain persistence and transaction guarantees.
</p>
</div>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h3 class="title"><a id="stl_intro_performance"></a>Performance
overhead</h3>
</div>
</div>
</div>
<p>
Because dbstl uses C++ template technologies, its
performance overhead is minimal.
</p>
<p>
The dbstl API performs almost equally to the C API, as
measured by two different implementations of the TPC-B
benchmark: <code class="literal">ex_tpcb</code> and
<code class="literal">exstl_tpcb</code>.
</p>
</div>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h3 class="title"><a id="stl_intro_portability"></a>Portability</h3>
</div>
</div>
</div>
<p>
The degree to which dbstl is portable to a new platform
is determined by whether Berkeley DB is available on the
platform, as well as whether an appropriate C++ compiler
is available on the platform.
</p>
<p>
For information on porting Berkeley DB to new
platforms, see the <em class="citetitle">Berkeley DB Porting Guide</em>.
</p>
<p>
Almost all the advanced C++ template features are used
in dbstl, including:
</p>
<div class="itemizedlist">
<ul type="disc">
<li>
<p>
member function templates
</p>
</li>
<li>
<p>
member function template overloads
</p>
</li>
<li>
<p>
partial specialization
</p>
</li>
<li>
<p>
default template parameters.
</p>
</li>
</ul>
</div>
<p>
For this reason, you need a standards-compatible C++
compiler to build dbstl. As of this writing, the following
compilers are known to build dbstl successfully:
</p>
<div class="itemizedlist">
<ul type="disc">
<li>
<p>
MSVC8
</p>
</li>
<li>
<p>
gcc3.4.4 and above
</p>
</li>
<li>
<p>
Intel C++ 9 and above
</p>
</li>
</ul>
</div>
<p>
For *nix platforms, if you can successfully configure
your Berkeley DB build script with
<code class="literal">--enable-stl</code>, then you should be
able to successfully build dbstl library and application
code using it.
</p>
<p>
Besides its own test suite, dbstl has also been tested
against, and passes, the following test suites:
</p>
<div class="itemizedlist">
<ul type="disc">
<li>
<p>
MS STL test suite
</p>
</li>
<li>
<p>
SGI STL test suite
</p>
</li>
</ul>
</div>
</div>
</div>
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