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101 lines
5.2 KiB
HTML
101 lines
5.2 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>Get number of rows affected by a query</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.ifx-affected-rows" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">ifx_affected_rows</h1>
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<p class="verinfo">(PHP 4, PHP 5 < 5.2.1)</p><p class="refpurpose"><span class="refname">ifx_affected_rows</span> — <span class="dc-title">Get number of rows affected by a query</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.ifx-affected-rows-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>ifx_affected_rows</strong></span>
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( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$result_id</code></span>
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) : <span class="type">int</span></div>
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<p class="para rdfs-comment">
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Returns the number of rows affected by a query associated with
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<code class="parameter">result_id</code>.
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</p>
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<p class="para">
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For inserts, updates and deletes the number is the real number
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(sqlerrd[2]) of affected rows. For selects it is an estimate
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(sqlerrd[0]). Don't rely on it. The database server can never
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return the actual number of rows that will be returned by a
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SELECT because it has not even begun fetching them at this stage
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(just after the "PREPARE" when the optimizer has determined the
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query plan).
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</p>
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<p class="para">
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Useful after <span class="function"><a href="ifx_prepare.html" class="function">ifx_prepare()</a></span> to limit queries to
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reasonable result sets.
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.ifx-affected-rows-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_id</code></dt>
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<dd>
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<p class="para">
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A valid result id returned by <span class="function"><a href="ifx_query.html" class="function">ifx_query()</a></span> or
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<span class="function"><a href="ifx_prepare.html" class="function">ifx_prepare()</a></span>.
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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.ifx-affected-rows-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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Returns the number of rows as an integer.
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.ifx-affected-rows-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-1282">
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<p><strong>Example #1 Informix affected rows</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 />$rid </span><span style="color: #007700">= </span><span style="color: #0000BB">ifx_prepare</span><span style="color: #007700">(</span><span style="color: #DD0000">"select * from emp<br /> where name like " </span><span style="color: #007700">. </span><span style="color: #0000BB">$name</span><span style="color: #007700">, </span><span style="color: #0000BB">$connid</span><span style="color: #007700">);<br />if (! </span><span style="color: #0000BB">$rid</span><span style="color: #007700">) {<br /> </span><span style="color: #FF8000">/* ... error ... */<br /></span><span style="color: #007700">}<br /></span><span style="color: #0000BB">$rowcount </span><span style="color: #007700">= </span><span style="color: #0000BB">ifx_affected_rows</span><span style="color: #007700">(</span><span style="color: #0000BB">$rid</span><span style="color: #007700">);<br />if (</span><span style="color: #0000BB">$rowcount </span><span style="color: #007700">> </span><span style="color: #0000BB">1000</span><span style="color: #007700">) {<br /> </span><span style="color: #0000BB">printf </span><span style="color: #007700">(</span><span style="color: #DD0000">"Too many rows in result set (%d)\n<br />"</span><span style="color: #007700">, </span><span style="color: #0000BB">$rowcount</span><span style="color: #007700">);<br /> die (</span><span style="color: #DD0000">"Please restrict your query<br />\n"</span><span style="color: #007700">);<br />}<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 seealso" id="refsect1-function.ifx-affected-rows-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="ifx_num_rows.html" class="function" rel="rdfs-seeAlso">ifx_num_rows()</a> - Count the rows already fetched from a query</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> |