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<title>Boost.Geometry (aka GGL, Generic Geometry Library)</title>
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<h1>x03_b_soci_example.cpp</h1>Second example showing how to get polygons from a database using SOCI and put them into GGL, using WKT.<p>
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<div class="fragment"><pre class="fragment"><span class="comment">// Boost.Geometry (aka GGL, Generic Geometry Library)</span>
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<span class="comment">//</span>
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<span class="comment">// Copyright Barend Gehrels 2007-2009, Geodan, Amsterdam, the Netherlands</span>
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<span class="comment">// Use, modification and distribution is subject to the Boost Software License,</span>
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<span class="comment">// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at</span>
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<span class="comment">// http://www.boost.org/LICENSE_1_0.txt)</span>
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<span class="comment">// SOCI example</span>
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<span class="comment">// b: using WKT to retrieve points</span>
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<span class="comment">// To build and run this example, see comments in example a</span>
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<span class="preprocessor">#include <soci.h></span>
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<span class="preprocessor">#include <soci-postgresql.h></span>
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<span class="preprocessor">#include <boost/algorithm/string.hpp></span>
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<span class="preprocessor">#include <boost/optional.hpp></span>
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<span class="preprocessor">#include <boost/timer.hpp></span>
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<span class="preprocessor">#include <boost/random.hpp></span>
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<span class="preprocessor">#include <boost/tuple/tuple.hpp></span>
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<span class="preprocessor">#include <iostream></span>
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<span class="preprocessor">#include <istream></span>
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<span class="preprocessor">#include <ostream></span>
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<span class="preprocessor">#include <sstream></span>
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<span class="preprocessor">#include <string></span>
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<span class="preprocessor">#include <exception></span>
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<span class="preprocessor">#include <boost/geometry/geometry.hpp></span>
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<span class="preprocessor">#include <<a class="code" href="geometries_8hpp.html">boost/geometry/geometries/geometries.hpp</a>></span>
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<span class="preprocessor">#include <boost/geometry/extensions/gis/io/wkt/wkt.hpp></span>
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<span class="keyword">struct </span>city
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{
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<a name="_a0"></a><a class="code" href="classboost_1_1geometry_1_1point.html" title="Basic point class, having coordinates defined in a neutral way.">boost::geometry::point<float, 2, boost::geometry::cs::geographic<boost::geometry::degree></a> > location;
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std::string name;
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};
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<span class="keyword">namespace </span>soci
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{
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<span class="keyword">template</span> <>
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<span class="keyword">struct </span>type_conversion<city>
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{
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<span class="keyword">typedef</span> soci::values base_type;
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<span class="keyword">static</span> <span class="keywordtype">void</span> from_base(<span class="keyword">const</span> base_type& v, soci::indicator ind, city& value)
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{
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<span class="keywordflow">try</span>
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{
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value.name = v.get<std::string>(<span class="stringliteral">"name"</span>);
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boost::geometry::read_wkt(v.get<std::string>(<span class="stringliteral">"wkt"</span>), value.location);
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}
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<span class="keywordflow">catch</span>(<span class="keyword">const</span> std::exception& e)
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{
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std::cout << e.what() << std::endl;
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}
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}
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<span class="keyword">static</span> <span class="keywordtype">void</span> to_base(<span class="keyword">const</span> city& value, base_type& v, soci::indicator& ind)
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{
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v.set(<span class="stringliteral">"name"</span>, value.name);
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std::ostringstream out;
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out << boost::geometry::wkt(value.location);
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v.set(<span class="stringliteral">"wkt"</span>, out.str());
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ind = i_ok;
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}
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};
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}
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<span class="keywordtype">int</span> main()
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{
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<span class="keywordflow">try</span>
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{
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soci::session sql(soci::postgresql, <span class="stringliteral">"dbname=ggl user=ggl password=ggl"</span>);
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<span class="keyword">typedef</span> std::vector<city> V;
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soci::rowset<city> rows = sql.prepare << <span class="stringliteral">"select name,astext(location) as wkt from cities"</span>;
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V vec;
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std::copy(rows.begin(), rows.end(), std::back_inserter(vec));
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<span class="keywordflow">for</span> (V::const_iterator it = vec.begin(); it != vec.end(); ++it)
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{
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<span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">double</span> sqrkm = 1000.0 * 1000.0;
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std::cout << it->name
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<< <span class="stringliteral">" "</span> << <a name="a1"></a><a class="code" href="group__utility.html#g62cc5db4d3bb1147591298b3500f8f1a" title="Main DSV-streaming function.">boost::geometry::dsv</a>(it->location)
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<span class="comment">//<< " " << boost::geometry::area(it->shape) / sqrkm << " km2"</span>
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<< std::endl;
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}
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}
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<span class="keywordflow">catch</span> (std::exception <span class="keyword">const</span> &e)
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{
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std::cerr << <span class="stringliteral">"Error: "</span> << e.what() << <span class="charliteral">'\n'</span>;
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}
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<span class="keywordflow">return</span> 0;
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}
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</pre></div> </div>
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<table width="100%">
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<td align="left"><small>
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<p>December 1, 2009</p>
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</small></td>
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<td align="right">
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<small>Copyright © 1995-2009 Barend Gehrels, Geodan, Amsterdam<br>
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Copyright © 2008-2009 Bruno Lalande, Paris<br>
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Copyright © 2009 Mateusz Loskot, Cadcorp, London<br>
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</small>
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