📄 function.sqlite-fetch-single.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>Fetches the first column of a result set as a string</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.sqlite-fetch-object.html">sqlite_fetch_object</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.sqlite-fetch-string.html">sqlite_fetch_string</a></div> <div class="up"><a href="ref.sqlite.html">SQLite Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.sqlite-fetch-single" class="refentry"> <div class="refnamediv"> <h1 class="refname">sqlite_fetch_single</h1> <h1 class="refname">SQLiteResult->fetchSingle</h1> <h1 class="refname">SQLiteUnbuffered->fetchSingle</h1> <p class="verinfo">(PHP 5, PECL sqlite:1.0.1-1.0.3)</p><p class="refpurpose"><span class="refname">sqlite_fetch_single</span> -- <span class="refname">SQLiteResult->fetchSingle</span> -- <span class="refname">SQLiteUnbuffered->fetchSingle</span> — <span class="dc-title">Fetches the first column of a result set as a string</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>sqlite_fetch_single</b></b></span> ( <span class="methodparam"><span class="type">resource</span> <tt class="parameter">$result</tt></span> [, <span class="methodparam"><span class="type">bool</span> <tt class="parameter">$decode_binary</tt></span> ] )</div> <p class="para rdfs-comment">Object oriented style (method):</p> <div class="classsynopsis"> <div class="ooclass"><b class="classname">SQLiteResult</b></div> <div class="methodsynopsis dc-description"> <span class="type">string</span> <span class="methodname"><b><b>fetchSingle</b></b></span> ([ <span class="methodparam"><span class="type">bool</span> <tt class="parameter">$decode_binary</tt></span> ] )</div> </div> <div class="classsynopsis"> <div class="ooclass"><b class="classname">SQLiteUnbuffered</b></div> <div class="methodsynopsis dc-description"> <span class="type">string</span> <span class="methodname"><b><b>fetchSingle</b></b></span> ([ <span class="methodparam"><span class="type">bool</span> <tt class="parameter">$decode_binary</tt></span> ] )</div> </div> <p class="para"> <b>sqlite_fetch_single()</b> is identical to <a href="function.sqlite-fetch-array.html" class="function">sqlite_fetch_array()</a> except that it returns the value of the first column of the rowset. </p> <p class="para"> This is the most optimal way to retrieve data when you are only interested in the values from a single column of data. </p> </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"> The SQLite result resource. This parameter is not required when using the object-oriented method. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">decode_binary</tt></i></span> <dd> <p class="para">When the <i><tt class="parameter">decode_binary</tt></i>parameter is set to <b><tt>TRUE</tt></b> (the default), PHP will decode the binary encodingit applied to the data if it was encoded using the<a href="function.sqlite-escape-string.html" class="function">sqlite_escape_string()</a>. You should normally leave thisvalue at its default, unless you are interoperating with databases created byother sqlite capable applications.</p> </dd> </dt> </dl> </p> </div> <div class="refsect1 examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example"> <p><b>Example #1 A <b>sqlite_fetch_single()</b> example</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br /></span><span style="color: #007700">if (</span><span style="color: #0000BB">$dbhandle </span><span style="color: #007700">= </span><span style="color: #0000BB">sqlite_open</span><span style="color: #007700">(</span><span style="color: #DD0000">'mysqlitedb'</span><span style="color: #007700">, </span><span style="color: #0000BB">0666</span><span style="color: #007700">, </span><span style="color: #0000BB">$sqliteerror</span><span style="color: #007700">)) {<br /><br /> </span><span style="color: #0000BB">$sql </span><span style="color: #007700">= </span><span style="color: #DD0000">"SELECT id FROM sometable WHERE id = 42"</span><span style="color: #007700">;<br /> </span><span style="color: #0000BB">$res </span><span style="color: #007700">= </span><span style="color: #0000BB">sqlite_query</span><span style="color: #007700">(</span><span style="color: #0000BB">$dbhandle</span><span style="color: #007700">, </span><span style="color: #0000BB">$sql</span><span style="color: #007700">);<br /><br /> if (</span><span style="color: #0000BB">sqlite_num_rows</span><span style="color: #007700">(</span><span style="color: #0000BB">$res</span><span style="color: #007700">) > </span><span style="color: #0000BB">0</span><span style="color: #007700">) {<br /> echo </span><span style="color: #0000BB">sqlite_fetch_single</span><span style="color: #007700">(</span><span style="color: #0000BB">$res</span><span style="color: #007700">); </span><span style="color: #FF8000">// 42<br /> </span><span style="color: #007700">}<br /> <br /> </span><span style="color: #0000BB">sqlite_close</span><span style="color: #007700">(</span><span style="color: #0000BB">$dbhandle</span><span style="color: #007700">);<br />}<br /></span><span style="color: #0000BB">?></span></span></code></div> </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.sqlite-fetch-array.html" class="function" rel="rdfs-seeAlso">sqlite_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.sqlite-fetch-object.html">sqlite_fetch_object</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.sqlite-fetch-string.html">sqlite_fetch_string</a></div> <div class="up"><a href="ref.sqlite.html">SQLite 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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