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<div class="title">simple-context-item.cpp</div> </div>
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<h1>simple-context-item.cpp</h1><p>This example parses a document and sets it as the context item. It then executes an XQuery expression that navigates relative to the context item.</p>
<div class="fragment"><pre class="fragment"><span class="preprocessor">#include &lt;iostream&gt;</span>
<span class="preprocessor">#include &lt;<a class="code" href="xqilla-simple_8hpp.html">xqilla/xqilla-simple.hpp</a>&gt;</span>
<span class="preprocessor">#include &lt;<a class="code" href="Sequence_8hpp.html">xqilla/runtime/Sequence.hpp</a>&gt;</span>
<span class="keywordtype">int</span> main(<span class="keywordtype">int</span> argc, <span class="keywordtype">char</span> *argv[]) {
<span class="comment">// Initialise Xerces-C and XQilla by creating the factory object</span>
<a name="_a0"></a><a class="code" href="classXQilla.html" title="Provides factory methods for creating XQQuery and DynamicContext objects.">XQilla</a> xqilla;
<span class="comment">// Parse an XQuery expression</span>
<span class="comment">// (AutoDelete deletes the object at the end of the scope)</span>
<a name="_a1"></a><a class="code" href="classAutoDelete.html">AutoDelete&lt;XQQuery&gt;</a> query(xqilla.<a name="a2"></a><a class="code" href="classXQilla.html#a7475d47b7b2fc51434ba9a381431f7ec" title="Parse the expression contained in the given query string.">parse</a>(X(<span class="stringliteral">&quot;foo/bar/@baz&quot;</span>)));
<span class="comment">// Create a context object</span>
<a class="code" href="classAutoDelete.html">AutoDelete&lt;DynamicContext&gt;</a> context(query-&gt;createDynamicContext());
<span class="comment">// Parse a document, and set it as the context item</span>
<a name="_a3"></a><a class="code" href="classSequence.html" title="An eagerly evaluated result of a query execution.">Sequence</a> seq = context-&gt;resolveDocument(X(<span class="stringliteral">&quot;foo.xml&quot;</span>));
<span class="keywordflow">if</span>(!seq.isEmpty() &amp;&amp; seq.first()-&gt;isNode()) {
context-&gt;setContextItem(seq.first());
context-&gt;setContextPosition(1);
context-&gt;setContextSize(1);
}
<span class="comment">// Execute the query, using the context</span>
<a name="_a4"></a><a class="code" href="classResult.html" title="A scoped pointer wrapper for the lazily evaluated query result.">Result</a> result = query-&gt;execute(context);
<span class="comment">// Iterate over the results, printing them</span>
<a name="_a5"></a><a class="code" href="classRefCountPointer.html">Item::Ptr</a> item;
<span class="keywordflow">while</span>(item = result-&gt;next(context)) {
std::cout &lt;&lt; UTF8(item-&gt;asString(context)) &lt;&lt; std::endl;
}
<span class="keywordflow">return</span> 0;
}
</pre></div> </div>
<hr size="1"/><address style="text-align: right;"><small>Generated on 18 May 2015 for XQilla Simple API by&nbsp;
<a href="http://www.doxygen.org/index.html">
<img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.6.1 </small></address>
<p>This example parses a document and sets it as the context item. It then executes an XQuery expression that navigates relative to the context item.</p>
<div class="fragment"><div class="line"><span class="preprocessor">#include &lt;iostream&gt;</span></div>
<div class="line"><span class="preprocessor">#include &lt;<a class="code" href="xqilla-simple_8hpp.html">xqilla/xqilla-simple.hpp</a>&gt;</span></div>
<div class="line"><span class="preprocessor">#include &lt;<a class="code" href="Sequence_8hpp.html">xqilla/runtime/Sequence.hpp</a>&gt;</span></div>
<div class="line"></div>
<div class="line"><span class="keywordtype">int</span> main(<span class="keywordtype">int</span> argc, <span class="keywordtype">char</span> *argv[]) {</div>
<div class="line"> <span class="comment">// Initialise Xerces-C and XQilla by creating the factory object</span></div>
<div class="line"> <a name="_a0"></a><a class="code" href="classXQilla.html">XQilla</a> xqilla;</div>
<div class="line"></div>
<div class="line"> <span class="comment">// Parse an XQuery expression</span></div>
<div class="line"> <span class="comment">// (AutoDelete deletes the object at the end of the scope)</span></div>
<div class="line"> <a name="_a1"></a><a class="code" href="classAutoDelete.html">AutoDelete&lt;XQQuery&gt;</a> query(xqilla.<a name="a2"></a><a class="code" href="classXQilla.html#a7475d47b7b2fc51434ba9a381431f7ec">parse</a>(X(<span class="stringliteral">&quot;foo/bar/@baz&quot;</span>)));</div>
<div class="line"></div>
<div class="line"> <span class="comment">// Create a context object</span></div>
<div class="line"> <a class="code" href="classAutoDelete.html">AutoDelete&lt;DynamicContext&gt;</a> context(query-&gt;createDynamicContext());</div>
<div class="line"></div>
<div class="line"> <span class="comment">// Parse a document, and set it as the context item</span></div>
<div class="line"> <a name="_a3"></a><a class="code" href="classSequence.html">Sequence</a> seq = context-&gt;resolveDocument(X(<span class="stringliteral">&quot;foo.xml&quot;</span>));</div>
<div class="line"> <span class="keywordflow">if</span>(!seq.isEmpty() &amp;&amp; seq.first()-&gt;isNode()) {</div>
<div class="line"> context-&gt;setContextItem(seq.first());</div>
<div class="line"> context-&gt;setContextPosition(1);</div>
<div class="line"> context-&gt;setContextSize(1);</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> <span class="comment">// Execute the query, using the context</span></div>
<div class="line"> <a name="_a4"></a><a class="code" href="classResult.html">Result</a> result = query-&gt;execute(context);</div>
<div class="line"></div>
<div class="line"> <span class="comment">// Iterate over the results, printing them</span></div>
<div class="line"> <a name="_a5"></a><a class="code" href="classRefCountPointer.html">Item::Ptr</a> item;</div>
<div class="line"> <span class="keywordflow">while</span>(item = result-&gt;<a name="a6"></a><a class="code" href="classResultImpl.html#a4820c3c36a27975b1b704b903d2d1c5f">next</a>(context)) {</div>
<div class="line"> std::cout &lt;&lt; UTF8(item-&gt;<a name="a7"></a><a class="code" href="classItem.html#aeefef8ff091f935f4c81b53031582561">asString</a>(context)) &lt;&lt; std::endl;</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> <span class="keywordflow">return</span> 0;</div>
<div class="line">}</div>
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