72 lines
5.6 KiB
HTML
72 lines
5.6 KiB
HTML
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<title>XQilla XQC API Documentation</title>
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<a style="float:right;" href="http://sourceforge.net/projects/xqilla"><img src="http://sflogo.sourceforge.net/sflogo.php?group_id=152021&type=2" border="0" alt="SourceForge.net Logo" /></a>
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<li><a href="examples.html"><span>Examples</span></a></li>
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<div class="title">xqc-basic.c</div> </div>
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<div class="contents">
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<p>This example executes a simple XQuery expression ("1 to 100"), which returns the numbers from 1 to 100 inclusive.</p>
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<div class="fragment"><div class="line"><span class="preprocessor">#include <<a class="code" href="xqilla-xqc_8h.html">xqilla/xqilla-xqc.h</a>></span></div>
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<div class="line"></div>
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<div class="line"><span class="keywordtype">int</span> main(<span class="keywordtype">int</span> argc, <span class="keywordtype">char</span> *argv[])</div>
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<div class="line">{</div>
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<div class="line"> <a name="_a0"></a><a class="code" href="structXQC__Implementation__s.html">XQC_Implementation</a> *impl;</div>
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<div class="line"> <a name="_a1"></a><a class="code" href="structXQC__Expression__s.html">XQC_Expression</a> *expr;</div>
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<div class="line"> <a name="_a2"></a><a class="code" href="structXQC__Sequence__s.html">XQC_Sequence</a> *seq;</div>
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<div class="line"> <a class="code" href="xqc_8h.html#aeb1ad206e9c38a7f84749cafe04d7a3f">XQC_Error</a> err;</div>
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<div class="line"> <span class="keyword">const</span> <span class="keywordtype">char</span> *value;</div>
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<div class="line"></div>
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<div class="line"> <span class="comment">// XQilla specific way to create an XQC_Implementation struct</span></div>
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<div class="line"> impl = <a name="a3"></a><a class="code" href="xqilla-xqc_8h.html#acd9659e93bbfafcd0cac9d7c4c12e13c">createXQillaXQCImplementation</a>(<a name="a4"></a><a class="code" href="xqc_8h.html#a8fbc00dfcf0a3527e0ccba36322e1c84">XQC_VERSION_NUMBER</a>);</div>
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<div class="line"> <span class="keywordflow">if</span>(impl == 0) <span class="keywordflow">return</span> 1;</div>
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<div class="line"></div>
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<div class="line"> <span class="comment">// Prepare an XQuery expression</span></div>
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<div class="line"> err = impl-><a name="a5"></a><a class="code" href="structXQC__Implementation__s.html#a4f82aa0b0e5c675f95f6c78b3bf76216">prepare</a>(impl, <span class="stringliteral">"1 to 100"</span>, 0, &expr);</div>
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<div class="line"> <span class="keywordflow">if</span>(err != 0) <span class="keywordflow">goto</span> free_impl;</div>
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<div class="line"></div>
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<div class="line"> <span class="comment">// Execute the query</span></div>
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<div class="line"> err = expr-><a name="a6"></a><a class="code" href="structXQC__Expression__s.html#a3181579fa2677d43c29efd31a649726c">execute</a>(expr, 0, &seq);</div>
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<div class="line"> <span class="keywordflow">if</span>(err != 0) <span class="keywordflow">goto</span> free_expr;</div>
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<div class="line"></div>
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<div class="line"> <span class="comment">// Iterate over the results, printing them</span></div>
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<div class="line"> <span class="keywordflow">while</span>((err = seq-><a name="a7"></a><a class="code" href="structXQC__Sequence__s.html#ab84594b06f7e69fd870c41f55ae5c6c6">next</a>(seq)) == <a name="a8"></a><a class="code" href="xqc_8h.html#aeb1ad206e9c38a7f84749cafe04d7a3fa975a11c6557d4d849e48f4034380a375">XQC_NO_ERROR</a>) {</div>
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<div class="line"> seq-><a name="a9"></a><a class="code" href="structXQC__Sequence__s.html#a3bd3b6dab0c68652af816438407dd037">string_value</a>(seq, &value);</div>
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<div class="line"> printf(<span class="stringliteral">"%s\n"</span>, value);</div>
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<div class="line"> }</div>
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<div class="line"></div>
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<div class="line"> <span class="keywordflow">if</span>(err == <a name="a10"></a><a class="code" href="xqc_8h.html#aeb1ad206e9c38a7f84749cafe04d7a3fadfd1d8eea45c90655b98cfd728bfee2e">XQC_END_OF_SEQUENCE</a>)</div>
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<div class="line"> err = <a class="code" href="xqc_8h.html#aeb1ad206e9c38a7f84749cafe04d7a3fa975a11c6557d4d849e48f4034380a375">XQC_NO_ERROR</a>;</div>
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<div class="line"></div>
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<div class="line"> <span class="comment">// free everything</span></div>
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<div class="line"> seq-><a name="a11"></a><a class="code" href="structXQC__Sequence__s.html#a13ab651edb4e0754cb8a032e2bce50b0">free</a>(seq);</div>
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<div class="line">free_expr:</div>
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<div class="line"> expr-><a name="a12"></a><a class="code" href="structXQC__Expression__s.html#a6aa28a94f0ff6732c26f131bbe4d44a9">free</a>(expr);</div>
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<div class="line">free_impl:</div>
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<div class="line"> impl-><a name="a13"></a><a class="code" href="structXQC__Implementation__s.html#afb636b6cbd236831652a518d9e71418d">free</a>(impl);</div>
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<div class="line"></div>
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<div class="line"> <span class="keywordflow">return</span> err;</div>
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<div class="line">}</div>
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