📄 function.mysql-list-fields.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>List MySQL table fields</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.mysql-list-dbs.html">mysql_list_dbs</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.mysql-list-processes.html">mysql_list_processes</a></div> <div class="up"><a href="ref.mysql.html">MySQL Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.mysql-list-fields" class="refentry"> <div class="refnamediv"> <h1 class="refname">mysql_list_fields</h1> <p class="verinfo">(PHP 4, PHP 5, PECL mysql:1.0)</p><p class="refpurpose"><span class="refname">mysql_list_fields</span> — <span class="dc-title">List MySQL table fields</span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">resource</span> <span class="methodname"><b><b>mysql_list_fields</b></b></span> ( <span class="methodparam"><span class="type">string</span> <tt class="parameter">$database_name</tt></span> , <span class="methodparam"><span class="type">string</span> <tt class="parameter">$table_name</tt></span> [, <span class="methodparam"><span class="type">resource</span> <tt class="parameter">$link_identifier</tt></span> ] )</div> <p class="para rdfs-comment"> Retrieves information about the given table name. </p> <p class="para"> This function is deprecated. It is preferable to use <a href="function.mysql-query.html" class="function">mysql_query()</a> to issue a SQL <i>SHOW COLUMNS FROM table [LIKE 'name']</i> statement instead. </p> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">database_name</tt></i></span> <dd> <p class="para"> The name of the database that's being queried. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">table_name</tt></i></span> <dd> <p class="para"> The name of the table that's being queried. </p> </dd> </dt> <dt><span class="term"><i><tt class="parameter">link_identifier</tt></i></span><dd><p class="para">The MySQL connection. If the link identifier is not specified, the last link opened by <a href="function.mysql-connect.html" class="function">mysql_connect()</a> is assumed. If no such link is found, itwill try to create one as if <a href="function.mysql-connect.html" class="function">mysql_connect()</a> was calledwith no arguments. If by chance no connection is found or established, an<b><tt>E_WARNING</tt></b> level error is generated.</p></dd></dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> A result pointer <a href="language.types.resource.html" class="type resource">resource</a> on success, or <b><tt>FALSE</tt></b> on failure. </p> <p class="para"> The returned result can be used with <a href="function.mysql-field-flags.html" class="function">mysql_field_flags()</a>, <a href="function.mysql-field-len.html" class="function">mysql_field_len()</a>, <a href="function.mysql-field-name.html" class="function">mysql_field_name()</a> and <a href="function.mysql-field-type.html" class="function">mysql_field_type()</a>. </p> </div> <div class="refsect1 examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example"> <p><b>Example #1 Alternate to deprecated <b>mysql_list_fields()</b></b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br />$result </span><span style="color: #007700">= </span><span style="color: #0000BB">mysql_query</span><span style="color: #007700">(</span><span style="color: #DD0000">"SHOW COLUMNS FROM sometable"</span><span style="color: #007700">);<br />if (!</span><span style="color: #0000BB">$result</span><span style="color: #007700">) {<br /> echo </span><span style="color: #DD0000">'Could not run query: ' </span><span style="color: #007700">. </span><span style="color: #0000BB">mysql_error</span><span style="color: #007700">();<br /> exit;<br />}<br />if (</span><span style="color: #0000BB">mysql_num_rows</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</span><span style="color: #007700">) > </span><span style="color: #0000BB">0</span><span style="color: #007700">) {<br /> while (</span><span style="color: #0000BB">$row </span><span style="color: #007700">= </span><span style="color: #0000BB">mysql_fetch_assoc</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</span><span style="color: #007700">)) {<br /> </span><span style="color: #0000BB">print_r</span><span style="color: #007700">(</span><span style="color: #0000BB">$row</span><span style="color: #007700">);<br /> }<br />}<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> <div class="example-contents"><p>The above example will output something similar to:</p></div> <div class="example-contents"><pre><div class="cdata"><pre>Array( [Field] => id [Type] => int(7) [Null] => [Key] => PRI [Default] => [Extra] => auto_increment)Array( [Field] => email [Type] => varchar(100) [Null] => [Key] => [Default] => [Extra] =>)</pre></div> </pre></div> </div> </p> </div> <div class="refsect1 notes"> <h3 class="title">Notes</h3> <blockquote><p><b class="note">Note</b>: For backward compatibility, the following deprecated alias may be used: <b>mysql_listfields()</b> <br /> </p></blockquote> </div> <div class="refsect1 seealso"> <h3 class="title">See Also</h3> <p class="para"> <ul class="simplelist"> <li class="member"><a href="function.mysql-field-flags.html" class="function" rel="rdfs-seeAlso">mysql_field_flags()</a></li> <li class="member"><a href="function.mysql-info.html" class="function" rel="rdfs-seeAlso">mysql_info()</a></li> </ul> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.mysql-list-dbs.html">mysql_list_dbs</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.mysql-list-processes.html">mysql_list_processes</a></div> <div class="up"><a href="ref.mysql.html">MySQL 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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