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110 lines
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110 lines
7.4 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<title>Sort a result from a dbx_query by a custom sort function</title>
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</head>
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<body class="docs"><div id="layout">
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<div id="layout-content"><div id="function.dbx-sort" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">dbx_sort</h1>
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<p class="verinfo">(PHP 4 >= 4.0.6, PHP 5 < 5.1.0, PECL dbx >= 1.1.0)</p><p class="refpurpose"><span class="refname">dbx_sort</span> — <span class="dc-title">
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Sort a result from a dbx_query by a custom sort function
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</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.dbx-sort-description">
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<h3 class="title">说明</h3>
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<div class="methodsynopsis dc-description">
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<span class="methodname"><strong>dbx_sort</strong></span>
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( <span class="methodparam"><span class="type">object</span> <code class="parameter">$result</code></span>
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, <span class="methodparam"><span class="type">string</span> <code class="parameter">$user_compare_function</code></span>
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) : <span class="type">bool</span></div>
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<p class="para rdfs-comment">
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Sort a result from a <span class="function"><a href="dbx_query.html" class="function">dbx_query()</a></span> call with a custom sort
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function.
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.dbx-sort-parameters">
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<h3 class="title">参数</h3>
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<p class="para">
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<dl>
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<dt>
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<code class="parameter">result</code></dt>
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<dd>
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<p class="para">
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A result set returned by <span class="function"><a href="dbx_query.html" class="function">dbx_query()</a></span>.
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</p>
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</dd>
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<dt>
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<code class="parameter">user_compare_function</code></dt>
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<dd>
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<p class="para">
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The user-defined comparison function. It must accept two arguments and
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return an integer less than, equal to, or greater than zero if the
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first argument is considered to be respectively less than, equal to,
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or greater than the second.
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</p>
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</dd>
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</dl>
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</p>
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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.dbx-sort-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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成功时返回 <strong><code>TRUE</code></strong>， 或者在失败时返回 <strong><code>FALSE</code></strong>。
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.dbx-sort-examples">
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<h3 class="title">范例</h3>
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<p class="para">
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<div class="example" id="example-979">
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<p><strong>Example #1 <span class="function"><strong>dbx_sort()</strong></span> example</strong></p>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br /></span><span style="color: #007700">function </span><span style="color: #0000BB">user_re_order</span><span style="color: #007700">(</span><span style="color: #0000BB">$a</span><span style="color: #007700">, </span><span style="color: #0000BB">$b</span><span style="color: #007700">) <br />{<br /> </span><span style="color: #0000BB">$rv </span><span style="color: #007700">= </span><span style="color: #0000BB">dbx_compare</span><span style="color: #007700">(</span><span style="color: #0000BB">$a</span><span style="color: #007700">, </span><span style="color: #0000BB">$b</span><span style="color: #007700">, </span><span style="color: #DD0000">"parentid"</span><span style="color: #007700">, </span><span style="color: #0000BB">DBX_CMP_DESC</span><span style="color: #007700">);<br /> if (!</span><span style="color: #0000BB">$rv</span><span style="color: #007700">) {<br /> </span><span style="color: #0000BB">$rv </span><span style="color: #007700">= </span><span style="color: #0000BB">dbx_compare</span><span style="color: #007700">(</span><span style="color: #0000BB">$a</span><span style="color: #007700">, </span><span style="color: #0000BB">$b</span><span style="color: #007700">, </span><span style="color: #DD0000">"id"</span><span style="color: #007700">, </span><span style="color: #0000BB">DBX_CMP_NUMBER</span><span style="color: #007700">);<br /> }<br /> return </span><span style="color: #0000BB">$rv</span><span style="color: #007700">;<br />}<br /><br /></span><span style="color: #0000BB">$link </span><span style="color: #007700">= </span><span style="color: #0000BB">dbx_connect</span><span style="color: #007700">(</span><span style="color: #0000BB">DBX_ODBC</span><span style="color: #007700">, </span><span style="color: #DD0000">""</span><span style="color: #007700">, </span><span style="color: #DD0000">"db"</span><span style="color: #007700">, </span><span style="color: #DD0000">"username"</span><span style="color: #007700">, </span><span style="color: #DD0000">"password"</span><span style="color: #007700">)<br /> or die(</span><span style="color: #DD0000">"Could not connect"</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$result </span><span style="color: #007700">= </span><span style="color: #0000BB">dbx_query</span><span style="color: #007700">(</span><span style="color: #0000BB">$link</span><span style="color: #007700">, </span><span style="color: #DD0000">"SELECT id, parentid, description FROM tbl ORDER BY id"</span><span style="color: #007700">);<br /> </span><span style="color: #FF8000">// data in $result is now ordered by id<br /><br /></span><span style="color: #0000BB">dbx_sort</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</span><span style="color: #007700">, </span><span style="color: #DD0000">"user_re_order"</span><span style="color: #007700">);<br /> </span><span style="color: #FF8000">// data in $result is now ordered by parentid (descending), then by id<br /><br /></span><span style="color: #0000BB">dbx_close</span><span style="color: #007700">(</span><span style="color: #0000BB">$link</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span>
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</span>
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</pre></div>
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</div>
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</div>
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</p>
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</div>
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<div class="refsect1 notes" id="refsect1-function.dbx-sort-notes">
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<h3 class="title">注释</h3>
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<blockquote class="note"><p><strong class="note">Note</strong>:
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<p class="para">
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It is always better to use <em>ORDER BY</em>
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<em>SQL</em> clause instead of <span class="function"><strong>dbx_sort()</strong></span>
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if possible.
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</p>
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</p></blockquote>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.dbx-sort-seealso">
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<h3 class="title">参见</h3>
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<p class="para">
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<ul class="simplelist">
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<li class="member"><span class="function"><a href="dbx_compare.html" class="function" rel="rdfs-seeAlso">dbx_compare()</a> - Compare two rows for sorting purposes</span></li>
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</ul>
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</p>
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</div>
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</div></div></div></body></html> |