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98 lines
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98 lines
9.6 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>Gets the number of rows in a result</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.maxdb-num-rows" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">maxdb_num_rows</h1>
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<h1 class="refname">maxdb::num_rows</h1>
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<p class="verinfo">(PECL maxdb >= 1.0)</p><p class="refpurpose"><span class="refname">maxdb_num_rows</span> -- <span class="refname">maxdb::num_rows</span> — <span class="dc-title">Gets the number of rows in a result</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.maxdb-num-rows-description">
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<h3 class="title">说明</h3>
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<p class="para">过程化风格</p>
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<div class="methodsynopsis dc-description">
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<span class="methodname"><strong>maxdb_num_rows</strong></span>
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( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$result</code></span>
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) : <span class="type">int</span></div>
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<p class="para rdfs-comment">面向对象风格</p>
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<div class="fieldsynopsis"><span class="type">int</span> <var class="varname">$maxdb->num_rows</var>;</div>
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<p class="para">
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Returns the number of rows in the result set.
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</p>
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<p class="para">
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The use of <span class="function"><strong>maxdb_num_rows()</strong></span> depends on whether you use
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buffered or unbuffered result sets.
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In case you use unbuffered resultsets <span class="function"><strong>maxdb_num_rows()</strong></span>
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will not correct the correct number of rows until all the rows in the result
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have been retrieved.
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</p>
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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.maxdb-num-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 number of rows in the result set.
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</p>
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<blockquote class="note"><p><strong class="note">Note</strong>:
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<p class="para">
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If the number of rows is greater than maximal int value, the number
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will be returned as a string.
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</p>
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</p></blockquote>
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</div>
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<div class="refsect1 examples" id="refsect1-function.maxdb-num-rows-examples">
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<h3 class="title">范例</h3>
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<div class="example" id="example-1385">
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<p><strong>Example #1 面向对象风格</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 />$maxdb </span><span style="color: #007700">= new </span><span style="color: #0000BB">maxdb</span><span style="color: #007700">(</span><span style="color: #DD0000">"localhost"</span><span style="color: #007700">, </span><span style="color: #DD0000">"MONA"</span><span style="color: #007700">, </span><span style="color: #DD0000">"RED"</span><span style="color: #007700">, </span><span style="color: #DD0000">"DEMODB"</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">/* check connection */<br /></span><span style="color: #007700">if (</span><span style="color: #0000BB">maxdb_connect_errno</span><span style="color: #007700">()) {<br /> </span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"Connect failed: %s\n"</span><span style="color: #007700">, </span><span style="color: #0000BB">maxdb_connect_error</span><span style="color: #007700">());<br /> exit();<br />}<br /><br />if (</span><span style="color: #0000BB">$result </span><span style="color: #007700">= </span><span style="color: #0000BB">$maxdb</span><span style="color: #007700">-></span><span style="color: #0000BB">query</span><span style="color: #007700">(</span><span style="color: #DD0000">"SELECT cno, name FROM hotel.customer ORDER BY name"</span><span style="color: #007700">)) {<br /><br /> </span><span style="color: #FF8000">/* determine number of rows result set */<br /> </span><span style="color: #0000BB">$row_cnt </span><span style="color: #007700">= </span><span style="color: #0000BB">$result</span><span style="color: #007700">-></span><span style="color: #0000BB">num_rows</span><span style="color: #007700">;<br /><br /> </span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"Result set has %d rows.\n"</span><span style="color: #007700">, </span><span style="color: #0000BB">$row_cnt</span><span style="color: #007700">);<br /><br /> </span><span style="color: #FF8000">/* close result set */<br /> </span><span style="color: #0000BB">$result</span><span style="color: #007700">-></span><span style="color: #0000BB">close</span><span style="color: #007700">();<br />}<br /><br /></span><span style="color: #FF8000">/* close connection */<br /></span><span style="color: #0000BB">$maxdb</span><span style="color: #007700">-></span><span style="color: #0000BB">close</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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<div class="example" id="example-1386">
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<p><strong>Example #2 过程化风格</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 />$link </span><span style="color: #007700">= </span><span style="color: #0000BB">maxdb_connect</span><span style="color: #007700">(</span><span style="color: #DD0000">"localhost"</span><span style="color: #007700">, </span><span style="color: #DD0000">"MONA"</span><span style="color: #007700">, </span><span style="color: #DD0000">"RED"</span><span style="color: #007700">, </span><span style="color: #DD0000">"DEMODB"</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">/* check connection */<br /></span><span style="color: #007700">if (</span><span style="color: #0000BB">maxdb_connect_errno</span><span style="color: #007700">()) {<br /> </span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"Connect failed: %s\n"</span><span style="color: #007700">, </span><span style="color: #0000BB">maxdb_connect_error</span><span style="color: #007700">());<br /> exit();<br />}<br /><br />if (</span><span style="color: #0000BB">$result </span><span style="color: #007700">= </span><span style="color: #0000BB">maxdb_query</span><span style="color: #007700">(</span><span style="color: #0000BB">$link</span><span style="color: #007700">, </span><span style="color: #DD0000">"SELECT cno, name FROM hotel.customer ORDER BY name"</span><span style="color: #007700">)) {<br /><br /> </span><span style="color: #FF8000">/* determine number of rows result set */<br /> </span><span style="color: #0000BB">$row_cnt </span><span style="color: #007700">= </span><span style="color: #0000BB">maxdb_num_rows</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</span><span style="color: #007700">);<br /><br /> </span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"Result set has %d rows.\n"</span><span style="color: #007700">, </span><span style="color: #0000BB">$row_cnt</span><span style="color: #007700">);<br /><br /> </span><span style="color: #FF8000">/* close result set */<br /> </span><span style="color: #0000BB">maxdb_free_result</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</span><span style="color: #007700">);<br />}<br /><br /></span><span style="color: #FF8000">/* close connection */<br /></span><span style="color: #0000BB">maxdb_close</span><span style="color: #007700">(</span><span style="color: #0000BB">$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 class="para">以上例程的输出类似于：</p>
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<div class="example-contents screen">
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<div class="cdata"><pre>
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Result set has 15 rows.
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</pre></div>
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</div>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.maxdb-num-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="maxdb_affected_rows.html" class="function" rel="rdfs-seeAlso">maxdb_affected_rows()</a> - Gets the number of affected rows in a previous MaxDB operation</span></li>
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<li class="member"><span class="function"><a href="maxdb_store_result.html" class="function" rel="rdfs-seeAlso">maxdb_store_result()</a> - Transfers a result set from the last query</span></li>
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<li class="member"><span class="function"><a href="maxdb_use_result.html" class="function" rel="rdfs-seeAlso">maxdb_use_result()</a> - Initiate a result set retrieval</span></li>
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<li class="member"><span class="function"><a href="maxdb_query.html" class="function" rel="rdfs-seeAlso">maxdb_query()</a> - Performs a query on the database</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> |