function.pg-fetch-result.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head> <title>Returns values from a result resource</title> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <body><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.pg-fetch-object.html">pg_fetch_object</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.pg-fetch-row.html">pg_fetch_row</a></div> <div class="up"><a href="ref.pgsql.html">PostgreSQL Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.pg-fetch-result" class="refentry"> <div class="refnamediv"> <h1 class="refname">pg_fetch_result</h1> <p class="verinfo">(PHP 4 >= 4.2.0, PHP 5)</p><p class="refpurpose"><span class="refname">pg_fetch_result</span> — <span class="dc-title">Returns values from a result resource</span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">string</span> <span class="methodname"><b><b>pg_fetch_result</b></b></span> ( <span class="methodparam"><span class="type">resource</span> <tt class="parameter">$result</tt></span> , <span class="methodparam"><span class="type">int</span> <tt class="parameter">$row</tt></span> , <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <tt class="parameter">$field</tt></span> )</div> <div class="methodsynopsis dc-description"> <span class="type">string</span> <span class="methodname"><b><b>pg_fetch_result</b></b></span> ( <span class="methodparam"><span class="type">resource</span> <tt class="parameter">$result</tt></span> , <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <tt class="parameter">$field</tt></span> )</div> <p class="para rdfs-comment"> <b>pg_fetch_result()</b> returns the value of a particular row and field (column) in a PostgreSQL result resource. </p> <blockquote><p><b class="note">Note</b>: This function used to be called <b>pg_result()</b>. <br /> </p></blockquote> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">result</tt></i></span> <dd> <p class="para"> PostgreSQL query result resource, returned by <a href="function.pg-query.html" class="function">pg_query()</a>, <a href="function.pg-query-params.html" class="function">pg_query_params()</a> or <a href="function.pg-execute.html" class="function">pg_execute()</a> (among others). </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">row</tt></i></span> <dd> <p class="para"> Row number in result to fetch. Rows are numbered from 0 upwards. If omitted, next row is fetched. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">field</tt></i></span> <dd> <p class="para"> A <a href="language.types.string.html" class="type string">string</a> representing the name of the field (column) to fetch, otherwise an <a href="language.types.integer.html" class="type int">int</a> representing the field number to fetch. Fields are numbered from 0 upwards. </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Boolean is returned as "t" or "f". All other types, including arrays are returned as strings formatted in the same default PostgreSQL manner that you would see in the <strong class="command">psql</strong> program. Database <i>NULL</i> values are returned as <b><tt>NULL</tt></b>. </p> <p class="para"> <b><tt>FALSE</tt></b> is returned if <i><tt class="parameter">row</tt></i> exceeds the number of rows in the set, or on any other error. </p> </div> <div class="refsect1 examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example"> <p><b>Example #1 <b>pg_fetch_result()</b> example</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br />$db </span><span style="color: #007700">= </span><span style="color: #0000BB">pg_connect</span><span style="color: #007700">(</span><span style="color: #DD0000">"dbname=users user=me"</span><span style="color: #007700">) || die();<br /><br /></span><span style="color: #0000BB">$res </span><span style="color: #007700">= </span><span style="color: #0000BB">pg_query</span><span style="color: #007700">(</span><span style="color: #0000BB">$db</span><span style="color: #007700">, </span><span style="color: #DD0000">"SELECT 1 UNION ALL SELECT 2"</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$val </span><span style="color: #007700">= </span><span style="color: #0000BB">pg_fetch_result</span><span style="color: #007700">(</span><span style="color: #0000BB">$res</span><span style="color: #007700">, </span><span style="color: #0000BB">1</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">);<br /><br />echo </span><span style="color: #DD0000">"First field in the second row is: "</span><span style="color: #007700">, </span><span style="color: #0000BB">$val</span><span style="color: #007700">, </span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> <div class="example-contents"><p>The above example will output:</p></div> <div class="example-contents"><pre><div class="cdata"><pre>First field in the second row is: 2</pre></div> </pre></div> </div> </p> </div> <div class="refsect1 seealso"> <h3 class="title">See Also</h3> <p class="para"> <ul class="simplelist"> <li class="member"><a href="function.pg-query.html" class="function" rel="rdfs-seeAlso">pg_query()</a></li> <li class="member"><a href="function.pg-fetch-array.html" class="function" rel="rdfs-seeAlso">pg_fetch_array()</a></li> </ul> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.pg-fetch-object.html">pg_fetch_object</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.pg-fetch-row.html">pg_fetch_row</a></div> <div class="up"><a href="ref.pgsql.html">PostgreSQL Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div></body></html>⌨️ 快捷键说明
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