function.fbsql-fetch-field.html
来自「php的帮助文档,涉及到PHP的案例和基本语法,以及实际应用内容」· HTML 代码 · 共 140 行
HTML
140 行
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head> <title>Get column information from a result and return as an object</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.fbsql-fetch-assoc.html">fbsql_fetch_assoc</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.fbsql-fetch-lengths.html">fbsql_fetch_lengths</a></div> <div class="up"><a href="ref.fbsql.html">FrontBase Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.fbsql-fetch-field" class="refentry"> <div class="refnamediv"> <h1 class="refname">fbsql_fetch_field</h1> <p class="verinfo">(PHP 4 >= 4.0.6, PHP 5)</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> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">object</span> <span class="methodname"><b><b>fbsql_fetch_field</b></b></span> ( <span class="methodparam"><span class="type">resource</span> <tt class="parameter">$result</tt></span> [, <span class="methodparam"><span class="type">int</span> <tt class="parameter">$field_offset</tt></span> ] )</div> <p class="para rdfs-comment"> Used in order to obtain information about fields in a certain query result. </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">A result identifierreturned by <a href="function.fbsql-query.html" class="function">fbsql_query()</a> or <a href="function.fbsql-db-query.html" class="function">fbsql_db_query()</a>.</p></dd></dt> <dt> <span class="term"><i><tt class="parameter">field_offset</tt></i></span> <dd> <p class="para"> The numerical offset of the field. The field index starts at 0. If not specified, the next field that wasn't yet retrieved by <b>fbsql_fetch_field()</b> is retrieved. </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Returns an object containing field information, or <b><tt>FALSE</tt></b> on errors. </p> <p class="para"> The properties of the object are: <ul class="itemizedlist"> <li class="listitem"> <span class="simpara"> name - column name </span> </li> <li class="listitem"> <span class="simpara"> table - name of the table the column belongs to </span> </li> <li class="listitem"> <span class="simpara"> max_length - maximum length of the column </span> </li> <li class="listitem"> <span class="simpara"> not_null - 1 if the column cannot be <b><tt>NULL</tt></b> </span> </li> <li class="listitem"> <span class="simpara"> type - the type of the column </span> </li> </ul> </p> </div> <div class="refsect1 examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example"> <p><b>Example #1 <b>fbsql_fetch_field()</b> example</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><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 $i:<br />\n"</span><span style="color: #007700">;<br /> </span><span style="color: #0000BB">$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: $meta->max_length<br />name: $meta->name<br />not_null: $meta->not_null<br />table: $meta->table<br />type: $meta->type<br /></pre>"</span><span style="color: #007700">;<br /> </span><span style="color: #0000BB">$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></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.fbsql-field-seek.html" class="function" rel="rdfs-seeAlso">fbsql_field_seek()</a></li> </ul> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.fbsql-fetch-assoc.html">fbsql_fetch_assoc</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.fbsql-fetch-lengths.html">fbsql_fetch_lengths</a></div> <div class="up"><a href="ref.fbsql.html">FrontBase Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div></body></html>⌨️ 快捷键说明
复制代码Ctrl + C
搜索代码Ctrl + F
全屏模式F11
增大字号Ctrl + =
减小字号Ctrl + -
显示快捷键?