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89 lines
7.8 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>Retrieves the number of fields (columns) on a statement</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.sqlsrv-num-fields" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">sqlsrv_num_fields</h1>
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<p class="verinfo">(No version information available, might only be in Git)</p><p class="refpurpose"><span class="refname">sqlsrv_num_fields</span> — <span class="dc-title">Retrieves the number of fields (columns) on a statement</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.sqlsrv-num-fields-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>sqlsrv_num_fields</strong></span>
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( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$stmt</code></span>
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) : <span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span></div>
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<p class="para rdfs-comment">
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Retrieves the number of fields (columns) on a statement.
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.sqlsrv-num-fields-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">stmt</code></dt>
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<dd>
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<p class="para">
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The statment for which the number of fields is returned.
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<span class="function"><strong>sqlsrv_num_fields()</strong></span> can be called on a statement before
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or after statement execution.
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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.sqlsrv-num-fields-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 fields on success. Returns <strong><code>FALSE</code></strong> otherwise.
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.sqlsrv-num-fields-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-2585">
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<p><strong>Example #1 <span class="function"><strong>sqlsrv_num_fields()</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 />$serverName </span><span style="color: #007700">= </span><span style="color: #DD0000">"serverName\sqlexpress"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$connectionInfo </span><span style="color: #007700">= array( </span><span style="color: #DD0000">"Database"</span><span style="color: #007700">=></span><span style="color: #DD0000">"dbName"</span><span style="color: #007700">, </span><span style="color: #DD0000">"UID"</span><span style="color: #007700">=></span><span style="color: #DD0000">"username"</span><span style="color: #007700">, </span><span style="color: #DD0000">"PWD"</span><span style="color: #007700">=></span><span style="color: #DD0000">"password"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$conn </span><span style="color: #007700">= </span><span style="color: #0000BB">sqlsrv_connect</span><span style="color: #007700">( </span><span style="color: #0000BB">$serverName</span><span style="color: #007700">, </span><span style="color: #0000BB">$connectionInfo</span><span style="color: #007700">);<br />if( </span><span style="color: #0000BB">$conn </span><span style="color: #007700">=== </span><span style="color: #0000BB">false </span><span style="color: #007700">) {<br /> die( </span><span style="color: #0000BB">print_r</span><span style="color: #007700">( </span><span style="color: #0000BB">sqlsrv_errors</span><span style="color: #007700">(), </span><span style="color: #0000BB">true</span><span style="color: #007700">));<br />}<br /><br /></span><span style="color: #0000BB">$sql </span><span style="color: #007700">= </span><span style="color: #DD0000">"SELECT * FROM Table_1"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$stmt </span><span style="color: #007700">= </span><span style="color: #0000BB">sqlsrv_query</span><span style="color: #007700">(</span><span style="color: #0000BB">$conn</span><span style="color: #007700">, </span><span style="color: #0000BB">$sql</span><span style="color: #007700">);<br />if( </span><span style="color: #0000BB">$stmt </span><span style="color: #007700">=== </span><span style="color: #0000BB">false</span><span style="color: #007700">) {<br /> die( </span><span style="color: #0000BB">print_r</span><span style="color: #007700">( </span><span style="color: #0000BB">sqlsrv_errors</span><span style="color: #007700">(), </span><span style="color: #0000BB">true</span><span style="color: #007700">));<br />}<br /><br /></span><span style="color: #0000BB">$numFields </span><span style="color: #007700">= </span><span style="color: #0000BB">sqlsrv_num_fields</span><span style="color: #007700">( </span><span style="color: #0000BB">$stmt </span><span style="color: #007700">);<br /><br />while( </span><span style="color: #0000BB">sqlsrv_fetch</span><span style="color: #007700">( </span><span style="color: #0000BB">$stmt </span><span style="color: #007700">)) {<br /> </span><span style="color: #FF8000">// Iterate through the fields of each row.<br /> </span><span style="color: #007700">for(</span><span style="color: #0000BB">$i </span><span style="color: #007700">= </span><span style="color: #0000BB">0</span><span style="color: #007700">; </span><span style="color: #0000BB">$i </span><span style="color: #007700">< </span><span style="color: #0000BB">$numFields</span><span style="color: #007700">; </span><span style="color: #0000BB">$i</span><span style="color: #007700">++) { <br /> echo </span><span style="color: #0000BB">sqlsrv_get_field</span><span style="color: #007700">(</span><span style="color: #0000BB">$stmt</span><span style="color: #007700">, </span><span style="color: #0000BB">$i</span><span style="color: #007700">).</span><span style="color: #DD0000">" "</span><span style="color: #007700">;<br /> }<br /> echo </span><span style="color: #DD0000">"<br />"</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.sqlsrv-num-fields-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="sqlsrv_field_metadata.html" class="function" rel="rdfs-seeAlso">sqlsrv_field_metadata()</a> - Retrieves metadata for the fields of a statement prepared by
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sqlsrv_prepare or sqlsrv_query</span></li>
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<li class="member"><span class="function"><a href="sqlsrv_fetch.html" class="function" rel="rdfs-seeAlso">sqlsrv_fetch()</a> - Makes the next row in a result set available for reading</span></li>
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<li class="member"><span class="function"><a href="sqlsrv_get_field.html" class="function" rel="rdfs-seeAlso">sqlsrv_get_field()</a> - Gets field data from the currently selected row</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> |