61 lines
3.9 KiB
HTML
61 lines
3.9 KiB
HTML
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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>
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<div class="fragment"><pre class="fragment"><span class="preprocessor">#include <iostream></span>
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<span class="preprocessor">#include <<a class="code" href="xqilla-simple_8hpp.html">xqilla/xqilla-simple.hpp</a>></span>
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<span class="preprocessor">#include <<a class="code" href="Sequence_8hpp.html">xqilla/runtime/Sequence.hpp</a>></span>
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<span class="keywordtype">int</span> main(<span class="keywordtype">int</span> argc, <span class="keywordtype">char</span> *argv[]) {
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<span class="comment">// Initialise Xerces-C and XQilla by creating the factory object</span>
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<a name="_a0"></a><a class="code" href="classXQilla.html" title="Provides factory methods for creating XQQuery and DynamicContext objects.">XQilla</a> xqilla;
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<span class="comment">// Parse an XQuery expression</span>
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<span class="comment">// (AutoDelete deletes the object at the end of the scope)</span>
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<a name="_a1"></a><a class="code" href="classAutoDelete.html">AutoDelete<XQQuery></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">"foo/bar/@baz"</span>)));
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<span class="comment">// Create a context object</span>
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<a class="code" href="classAutoDelete.html">AutoDelete<DynamicContext></a> context(query->createDynamicContext());
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<span class="comment">// Parse a document, and set it as the context item</span>
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<a name="_a3"></a><a class="code" href="classSequence.html" title="An eagerly evaluated result of a query execution.">Sequence</a> seq = context->resolveDocument(X(<span class="stringliteral">"foo.xml"</span>));
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<span class="keywordflow">if</span>(!seq.isEmpty() && seq.first()->isNode()) {
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context->setContextItem(seq.first());
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context->setContextPosition(1);
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context->setContextSize(1);
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}
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<span class="comment">// Execute the query, using the context</span>
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<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->execute(context);
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<span class="comment">// Iterate over the results, printing them</span>
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<a name="_a5"></a><a class="code" href="classRefCountPointer.html">Item::Ptr</a> item;
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<span class="keywordflow">while</span>(item = result->next(context)) {
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std::cout << UTF8(item->asString(context)) << std::endl;
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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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<hr size="1"/><address style="text-align: right;"><small>Generated on 8 Jul 2015 for XQilla Simple API by
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<img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.6.1 </small></address>
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