<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >mysql_fetch_field</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK REL="HOME" TITLE="PHP 手册" HREF="index.html"><LINK REL="UP" TITLE="MySQL 函数" HREF="ref.mysql.html"><LINK REL="PREVIOUS" TITLE="mysql_fetch_assoc" HREF="function.mysql-fetch-assoc.html"><LINK REL="NEXT" TITLE="mysql_fetch_lengths" HREF="function.mysql-fetch-lengths.html"><META HTTP-EQUIV="Content-type" CONTENT="text/html; charset=UTF-8"></HEAD ><BODY CLASS="refentry" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#840084" ALINK="#0000FF" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >PHP 手册</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="function.mysql-fetch-assoc.html" ACCESSKEY="P" >上一页</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="function.mysql-fetch-lengths.html" ACCESSKEY="N" >下一页</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="function.mysql-fetch-field" ></A >mysql_fetch_field</H1 ><DIV CLASS="refnamediv" ><A NAME="AEN135529" ></A ><P > (PHP 3, PHP 4, PHP 5)</P >mysql_fetch_field -- 从结果集中取得列信息并作为对象返回 </DIV ><DIV CLASS="refsect1" ><A NAME="AEN135532" ></A ><H2 >说明</H2 >object <B CLASS="methodname" >mysql_fetch_field</B > ( resource result [, int field_offset] )<BR ></BR ><P > 返回一个包含字段信息的对象。 </P ><P > <B CLASS="function" >mysql_fetch_field()</B > 可以用来从某个查询结果中取得字段的信息。如果没有指定字段偏移量,则下一个尚未被 <B CLASS="function" >mysql_fetch_field()</B > 取得的字段被提取。 </P ><P > 对象的属性为: <P ></P ><UL ><LI ><P > name - 列名 </P ></LI ><LI ><P > table - 该列所在的表名 </P ></LI ><LI ><P > max_length - 该列最大长度 </P ></LI ><LI ><P > not_null - 1,如果该列不能为 <TT CLASS="constant" ><B >NULL</B ></TT > </P ></LI ><LI ><P > primary_key - 1,如果该列是 primary key </P ></LI ><LI ><P > unique_key - 1,如果该列是 unique key </P ></LI ><LI ><P > multiple_key - 1,如果该列是 non-unique key </P ></LI ><LI ><P > numeric - 1,如果该列是 numeric </P ></LI ><LI ><P > blob - 1,如果该列是 BLOB </P ></LI ><LI ><P > type - 该列的类型 </P ></LI ><LI ><P > unsigned - 1,如果该列是无符号数 </P ></LI ><LI ><P > zerofill - 1,如果该列是 zero-filled </P ></LI ></UL > </P ><DIV CLASS="note" ><BLOCKQUOTE CLASS="note" ><P ><B >注意: </B >本函数返回的字段名是<SPAN CLASS="emphasis" ><I CLASS="emphasis" >区分大小写</I ></SPAN >的。</P ></BLOCKQUOTE ></DIV ><P > <TABLE WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" CLASS="EXAMPLE" ><TR ><TD ><DIV CLASS="example" ><A NAME="AEN135578" ></A ><P ><B >例 1. <B CLASS="function" >mysql_fetch_field()</B ></B ></P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" CELLPADDING="5" ><TR ><TD ><code><font color="#000000"> <font color="#0000BB"><?php<br />mysql_connect</font><font color="#007700">(</font><font color="#DD0000">'localhost:3306'</font><font color="#007700">, </font><font color="#0000BB">$user</font><font color="#007700">, </font><font color="#0000BB">$password</font><font color="#007700">)<br /> or die(</font><font color="#DD0000">"Could not connect: " </font><font color="#007700">. </font><font color="#0000BB">mysql_error</font><font color="#007700">());<br /></font><font color="#0000BB">mysql_select_db</font><font color="#007700">(</font><font color="#DD0000">"database"</font><font color="#007700">);<br /></font><font color="#0000BB">$result </font><font color="#007700">= </font><font color="#0000BB">mysql_query</font><font color="#007700">(</font><font color="#DD0000">"select * from table"</font><font color="#007700">)<br /> or die(</font><font color="#DD0000">"Query failed: " </font><font color="#007700">. </font><font color="#0000BB">mysql_error</font><font color="#007700">());<br /></font><font color="#FF8000">/* get column metadata */<br /></font><font color="#0000BB">$i </font><font color="#007700">= </font><font color="#0000BB">0</font><font color="#007700">;<br />while (</font><font color="#0000BB">$i </font><font color="#007700">< </font><font color="#0000BB">mysql_num_fields</font><font color="#007700">(</font><font color="#0000BB">$result</font><font color="#007700">)) {<br /> echo </font><font color="#DD0000">"Information for column $i:<br /></font><font color="#007700">\n</font><font color="#DD0000">"</font><font color="#007700">;<br /> </font><font color="#0000BB">$meta </font><font color="#007700">= </font><font color="#0000BB">mysql_fetch_field</font><font color="#007700">(</font><font color="#0000BB">$result</font><font color="#007700">);<br /> if (!</font><font color="#0000BB">$meta</font><font color="#007700">) {<br /> echo </font><font color="#DD0000">"No information available<br />\n"</font><font color="#007700">;<br /> }<br /> echo </font><font color="#DD0000">"<pre><br />blob: $meta</font><font color="#007700">-></font><font color="#DD0000">blob<br />max_length: $meta</font><font color="#007700">-></font><font color="#DD0000">max_length<br />multiple_key: $meta</font><font color="#007700">-></font><font color="#DD0000">multiple_key<br />name: $meta</font><font color="#007700">-></font><font color="#DD0000">name<br />not_null: $meta</font><font color="#007700">-></font><font color="#DD0000">not_null<br />numeric: $meta</font><font color="#007700">-></font><font color="#DD0000">numeric<br />primary_key: $meta</font><font color="#007700">-></font><font color="#DD0000">primary_key<br />table: $meta</font><font color="#007700">-></font><font color="#DD0000">table<br />type: $meta</font><font color="#007700">-></font><font color="#DD0000">type<br />unique_key: $meta</font><font color="#007700">-></font><font color="#DD0000">unique_key<br />unsigned: $meta</font><font color="#007700">-></font><font color="#DD0000">unsigned<br />zerofill: $meta</font><font color="#007700">-></font><font color="#DD0000">zerofill<br /></pre>"</font><font color="#007700">;<br /> </font><font color="#0000BB">$i</font><font color="#007700">++;<br />}<br /></font><font color="#0000BB">mysql_free_result</font><font color="#007700">(</font><font color="#0000BB">$result</font><font color="#007700">);<br /></font><font color="#0000BB">?></font> </font> </code></TD ></TR ></TABLE ></DIV ></TD ></TR ></TABLE > </P ><P > 参见 <A HREF="function.mysql-field-seek.html" ><B CLASS="function" >mysql_field_seek()</B ></A >。 </P ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="function.mysql-fetch-assoc.html" ACCESSKEY="P" >上一页</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >起始页</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="function.mysql-fetch-lengths.html" ACCESSKEY="N" >下一页</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" 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