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<!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 column information from a result and return as an object</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.fbsql-fetch-field" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">fbsql_fetch_field</h1>
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<p class="verinfo">(PHP 4 >= 4.0.6, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">fbsql_fetch_field</span> — <span class="dc-title">Get column information from a result and return as an object</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.fbsql-fetch-field-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>fbsql_fetch_field</strong></span>
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( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$result</code></span>
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[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$field_offset</code></span>
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] ) : <span class="type">object</span></div>
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<p class="para rdfs-comment">
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Used in order to obtain information about fields in a certain query result.
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.fbsql-fetch-field-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">
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result</code></dt>
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<dd>
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<p class="para">由 <span class="function"><a href="fbsql_query.html" class="function">fbsql_query()</a></span>
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或 <span class="function"><a href="fbsql_db_query.html" class="function">fbsql_db_query()</a></span> 返回的结果标识符。</p></dd>
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<dt>
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<code class="parameter">field_offset</code></dt>
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<dd>
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<p class="para">
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The numerical offset of the field. The field index starts at 0.
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If not specified, the next field that wasn't yet retrieved by
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<span class="function"><strong>fbsql_fetch_field()</strong></span> is retrieved.
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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.fbsql-fetch-field-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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Returns an object containing field information, or <strong><code>FALSE</code></strong> on errors.
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</p>
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<p class="para">
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The properties of the object are:
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<ul class="itemizedlist">
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<li class="listitem">
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<span class="simpara">
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name - column name
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</span>
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</li>
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<li class="listitem">
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<span class="simpara">
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table - name of the table the column belongs to
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</span>
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</li>
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<li class="listitem">
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<span class="simpara">
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max_length - maximum length of the column
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</span>
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</li>
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<li class="listitem">
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<span class="simpara">
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not_null - 1 if the column cannot be <strong><code>NULL</code></strong>
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</span>
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</li>
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<li class="listitem">
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<span class="simpara">
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type - the type of the column
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</span>
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</li>
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</ul>
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.fbsql-fetch-field-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-1215">
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<p><strong>Example #1 <span class="function"><strong>fbsql_fetch_field()</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 />fbsql_connect</span><span style="color: #007700">(</span><span style="color: #0000BB">$host</span><span style="color: #007700">, </span><span style="color: #0000BB">$user</span><span style="color: #007700">, </span><span style="color: #0000BB">$password</span><span style="color: #007700">)<br /> or die(</span><span style="color: #DD0000">"Could not connect"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$result </span><span style="color: #007700">= </span><span style="color: #0000BB">fbsql_db_query</span><span style="color: #007700">(</span><span style="color: #DD0000">"database"</span><span style="color: #007700">, </span><span style="color: #DD0000">"select * from table"</span><span style="color: #007700">)<br /> or die(</span><span style="color: #DD0000">"Query failed"</span><span style="color: #007700">);<br /></span><span style="color: #FF8000"># get column metadata<br /></span><span style="color: #0000BB">$i </span><span style="color: #007700">= </span><span style="color: #0000BB">0</span><span style="color: #007700">;<br />while (</span><span style="color: #0000BB">$i </span><span style="color: #007700">< </span><span style="color: #0000BB">fbsql_num_fields</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</span><span style="color: #007700">)) {<br /> echo </span><span style="color: #DD0000">"Information for column </span><span style="color: #0000BB">$i</span><span style="color: #DD0000">:<br />\n"</span><span style="color: #007700">;<br /> </span><span style="color: #0000BB">$meta </span><span style="color: #007700">= </span><span style="color: #0000BB">fbsql_fetch_field</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</span><span style="color: #007700">);<br /> if (!</span><span style="color: #0000BB">$meta</span><span style="color: #007700">) {<br /> echo </span><span style="color: #DD0000">"No information available<br />\n"</span><span style="color: #007700">;<br /> }<br /> echo </span><span style="color: #DD0000">"<pre><br />max_length: </span><span style="color: #0000BB">$meta</span><span style="color: #007700">-></span><span style="color: #0000BB">max_length</span><span style="color: #DD0000"><br />name: </span><span style="color: #0000BB">$meta</span><span style="color: #007700">-></span><span style="color: #0000BB">name</span><span style="color: #DD0000"><br />not_null: </span><span style="color: #0000BB">$meta</span><span style="color: #007700">-></span><span style="color: #0000BB">not_null</span><span style="color: #DD0000"><br />table: </span><span style="color: #0000BB">$meta</span><span style="color: #007700">-></span><span style="color: #0000BB">table</span><span style="color: #DD0000"><br />type: </span><span style="color: #0000BB">$meta</span><span style="color: #007700">-></span><span style="color: #0000BB">type</span><span style="color: #DD0000"><br /></pre>"</span><span style="color: #007700">;<br /> </span><span style="color: #0000BB">$i</span><span style="color: #007700">++;<br />}<br /></span><span style="color: #0000BB">fbsql_free_result</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</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 seealso" id="refsect1-function.fbsql-fetch-field-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="fbsql_field_seek.html" class="function" rel="rdfs-seeAlso">fbsql_field_seek()</a> - Set result pointer to a specified field offset</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>
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