<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >mysqli_fetch_fields</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="MySQLi 扩展库" HREF="ref.mysqli.html"><LINK REL="PREVIOUS" TITLE="mysqli_fetch_field" HREF="function.mysqli-fetch-field.html"><LINK REL="NEXT" TITLE="mysqli_fetch_lengths" HREF="function.mysqli-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.mysqli-fetch-field.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.mysqli-fetch-lengths.html" ACCESSKEY="N" >下一页</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="function.mysqli-fetch-fields" ></A >mysqli_fetch_fields</H1 ><DIV CLASS="refnamediv" ><A NAME="AEN138848" ></A ><P > (PHP 5)</P >mysqli_fetch_fields<P > (no version information, might be only in CVS)</P >result->fetch_fields() -- Returns an array of objects representing the fields in a result set</DIV ><DIV CLASS="refsect1" ><A NAME="AEN138852" ></A ><H2 >说明</H2 ><P >Procedural Style:</P >array <B CLASS="methodname" >mysqli_fetch_fields</B > ( mysqli_result result )<BR ></BR ><P >Object oriented style (method):</P >class <B CLASS="classname" >mysqli_result</B > { <BR ></BR >array <B CLASS="methodname" >fetch_fields</B > ( void )<BR ></BR >}<P > This function serves an identical purpose to the <A HREF="function.mysqli-fetch-field.html" ><B CLASS="function" >mysqli_fetch_field()</B ></A > function with the single difference that, instead of returning one object at a time for each field, the columns are returned as an array of objects. </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN138871" ></A ><H2 >参数</H2 ><P > <P ></P ><DIV CLASS="variablelist" ><DL ><DT ><CODE CLASS="parameter" > result</CODE ></DT ><DD ><P >Procedural style only: A result set identifier returned by <A HREF="function.mysqli-query.html" ><B CLASS="function" >mysqli_query()</B ></A >, <A HREF="function.mysqli-store-result.html" ><B CLASS="function" >mysqli_store_result()</B ></A > or <A HREF="function.mysqli-use-result.html" ><B CLASS="function" >mysqli_use_result()</B ></A >.</P ></DD ></DL ></DIV > </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN138883" ></A ><H2 >返回值</H2 ><P > Returns an array of objects which contains field definition information or <TT CLASS="constant" ><B >FALSE</B ></TT > if no field information is available. </P ><P > <DIV CLASS="table" ><A NAME="AEN138888" ></A ><P ><B >表 1. Object properties</B ></P ><TABLE BORDER="1" CLASS="CALSTABLE" ><COL><COL><THEAD ><TR ><TH >Property</TH ><TH >Description</TH ></TR ></THEAD ><TBODY ><TR ><TD >name</TD ><TD >The name of the column</TD ></TR ><TR ><TD >orgname</TD ><TD >Original column name if an alias was specified</TD ></TR ><TR ><TD >table</TD ><TD >The name of the table this field belongs to (if not calculated)</TD ></TR ><TR ><TD >orgtable</TD ><TD >Original table name if an alias was specified</TD ></TR ><TR ><TD >def</TD ><TD >The default value for this field, represented as a string</TD ></TR ><TR ><TD >max_length</TD ><TD >The maximum width of the field for the result set.</TD ></TR ><TR ><TD >length</TD ><TD >The width of the field, as specified in the table definition.</TD ></TR ><TR ><TD >charsetnr</TD ><TD >The character set number for the field.</TD ></TR ><TR ><TD >flags</TD ><TD >An integer representing the bit-flags for the field.</TD ></TR ><TR ><TD >type</TD ><TD >The data type used for this field</TD ></TR ><TR ><TD >decimals</TD ><TD >The number of decimals used (for integer fields)</TD ></TR ></TBODY ></TABLE ></DIV > </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN138929" ></A ><H2 >范例</H2 ><TABLE WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" CLASS="EXAMPLE" ><TR ><TD ><DIV CLASS="example" ><A NAME="AEN138931" ></A ><P ><B >例 1. Object oriented style</B ></P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" CELLPADDING="5" ><TR ><TD ><code><font color="#000000"> <font color="#0000BB"><?php<br />$mysqli </font><font color="#007700">= new </font><font color="#0000BB">mysqli</font><font color="#007700">(</font><font color="#DD0000">"localhost"</font><font color="#007700">, </font><font color="#DD0000">"my_user"</font><font color="#007700">, </font><font color="#DD0000">"my_password"</font><font color="#007700">, </font><font color="#DD0000">"world"</font><font color="#007700">);<br /><br /></font><font color="#FF8000">/* check connection */<br /></font><font color="#007700">if (</font><font color="#0000BB">mysqli_connect_errno</font><font color="#007700">()) {<br /> </font><font color="#0000BB">printf</font><font color="#007700">(</font><font color="#DD0000">"Connect failed: %s\n"</font><font color="#007700">, </font><font color="#0000BB">mysqli_connect_error</font><font color="#007700">());<br /> exit();<br />}<br /><br /></font><font color="#0000BB">$query </font><font color="#007700">= </font><font color="#DD0000">"SELECT Name, SurfaceArea from Country ORDER BY Code LIMIT 5"</font><font color="#007700">;<br /><br />if (</font><font color="#0000BB">$result </font><font color="#007700">= </font><font color="#0000BB">$mysqli</font><font color="#007700">-></font><font color="#0000BB">query</font><font color="#007700">(</font><font color="#0000BB">$query</font><font color="#007700">)) {<br /><br /> </font><font color="#FF8000">/* Get field information for all columns */<br /> </font><font color="#0000BB">$finfo </font><font color="#007700">= </font><font color="#0000BB">$result</font><font color="#007700">-></font><font color="#0000BB">fetch_fields</font><font color="#007700">();<br /><br /> foreach (</font><font color="#0000BB">$finfo </font><font color="#007700">as </font><font color="#0000BB">$val</font><font color="#007700">) {<br /> </font><font color="#0000BB">printf</font><font color="#007700">(</font><font color="#DD0000">"Name: %s\n"</font><font color="#007700">, </font><font color="#0000BB">$val</font><font color="#007700">-></font><font color="#0000BB">name</font><font color="#007700">);<br /> </font><font color="#0000BB">printf</font><font color="#007700">(</font><font color="#DD0000">"Table: %s\n"</font><font color="#007700">, </font><font color="#0000BB">$val</font><font color="#007700">-></font><font color="#0000BB">table</font><font color="#007700">);<br /> </font><font color="#0000BB">printf</font><font color="#007700">(</font><font color="#DD0000">"max. Len: %d\n"</font><font color="#007700">, </font><font color="#0000BB">$val</font><font color="#007700">-></font><font color="#0000BB">max_length</font><font color="#007700">);<br /> </font><font color="#0000BB">printf</font><font color="#007700">(</font><font color="#DD0000">"Flags: %d\n"</font><font color="#007700">, </font><font color="#0000BB">$val</font><font color="#007700">-></font><font color="#0000BB">flags</font><font color="#007700">);<br /> </font><font color="#0000BB">printf</font><font color="#007700">(</font><font color="#DD0000">"Type: %d\n\n"</font><font color="#007700">, </font><font color="#0000BB">$val</font><font color="#007700">-></font><font color="#0000BB">type</font><font color="#007700">);<br /> }<br /> </font><font color="#0000BB">$result</font><font color="#007700">-></font><font color="#0000BB">close</font><font color="#007700">();<br />}<br /><br /></font><font color="#FF8000">/* close connection */<br /></font><font color="#0000BB">$mysqli</font><font color="#007700">-></font><font color="#0000BB">close</font><font color="#007700">();<br /></font><font color="#0000BB">?></font> </font> </code></TD ></TR ></TABLE ></DIV ></TD ></TR ></TABLE ><TABLE WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" CLASS="EXAMPLE" ><TR ><TD ><DIV CLASS="example" ><A NAME="AEN138934" ></A ><P ><B >例 2. Procedural style</B ></P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" CELLPADDING="5" ><TR ><TD ><code><font color="#000000"> <font color="#0000BB"><?php<br />$link </font><font color="#007700">= </font><font color="#0000BB">mysqli_connect</font><font color="#007700">(</font><font color="#DD0000">"localhost"</font><font color="#007700">, </font><font color="#DD0000">"my_user"</font><font color="#007700">, </font><font color="#DD0000">"my_password"</font><font color="#007700">, </font><font color="#DD0000">"world"</font><font color="#007700">);<br /><br /></font><font color="#FF8000">/* check connection */<br /></font><font color="#007700">if (</font><font color="#0000BB">mysqli_connect_errno</font><font color="#007700">()) {<br /> </font><font color="#0000BB">printf</font><font color="#007700">(</font><font color="#DD0000">"Connect failed: %s\n"</font><font color="#007700">, </font><font color="#0000BB">mysqli_connect_error</font><font color="#007700">());<br /> exit();<br />}<br /><br /></font><font color="#0000BB">$query </font><font color="#007700">= </font><font color="#DD0000">"SELECT Name, SurfaceArea from Country ORDER BY Code LIMIT 5"</font><font color="#007700">;<br /><br />if (</font><font color="#0000BB">$result </font><font color="#007700">= </font><font color="#0000BB">mysqli_query</font><font color="#007700">(</font><font color="#0000BB">$link</font><font color="#007700">, </font><font color="#0000BB">$query</font><font color="#007700">)) {<br /><br /> </font><font color="#FF8000">/* Get field information for all columns */<br /> </font><font color="#0000BB">$finfo </font><font color="#007700">= </font><font color="#0000BB">mysqli_fetch_fields</font><font color="#007700">(</font><font color="#0000BB">$result</font><font color="#007700">);<br /><br /> foreach (</font><font color="#0000BB">$finfo </font><font color="#007700">as </font><font color="#0000BB">$val</font><font color="#007700">) {<br /> </font><font color="#0000BB">printf</font><font color="#007700">(</font><font color="#DD0000">"Name: %s\n"</font><font color="#007700">, </font><font color="#0000BB">$val</font><font color="#007700">-></font><font color="#0000BB">name</font><font color="#007700">);<br /> </font><font color="#0000BB">printf</font><font color="#007700">(</font><font color="#DD0000">"Table: %s\n"</font><font color="#007700">, </font><font color="#0000BB">$val</font><font color="#007700">-></font><font color="#0000BB">table</font><font color="#007700">);<br /> </font><font color="#0000BB">printf</font><font color="#007700">(</font><font color="#DD0000">"max. Len: %d\n"</font><font color="#007700">, </font><font color="#0000BB">$val</font><font color="#007700">-></font><font color="#0000BB">max_length</font><font color="#007700">);<br /> </font><font color="#0000BB">printf</font><font color="#007700">(</font><font color="#DD0000">"Flags: %d\n"</font><font color="#007700">, </font><font color="#0000BB">$val</font><font color="#007700">-></font><font color="#0000BB">flags</font><font color="#007700">);<br /> </font><font color="#0000BB">printf</font><font color="#007700">(</font><font color="#DD0000">"Type: %d\n\n"</font><font color="#007700">, </font><font color="#0000BB">$val</font><font color="#007700">-></font><font color="#0000BB">type</font><font color="#007700">);<br /> }<br /> </font><font color="#0000BB">mysqli_free_result</font><font color="#007700">(</font><font color="#0000BB">$result</font><font color="#007700">);<br />}<br /><br /></font><font color="#FF8000">/* close connection */<br /></font><font color="#0000BB">mysqli_close</font><font color="#007700">(</font><font color="#0000BB">$link</font><font color="#007700">);<br /></font><font color="#0000BB">?></font> </font> </code></TD ></TR ></TABLE ></DIV ></TD ></TR ></TABLE ><P >上例将输出:</P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" CELLPADDING="5" ><TR ><TD ><PRE CLASS="screen" >Name: Name Table: Country max. Len: 11 Flags: 1 Type: 254 Name: SurfaceArea Table: Country max. Len: 10 Flags: 32769 Type: 4</PRE ></TD ></TR ></TABLE ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN138939" ></A ><H2 >参见</H2 ><P > <P ></P ><TABLE BORDER="0" ><TBODY ><TR ><TD ><A HREF="function.mysqli-num-fields.html" ><B CLASS="function" >mysqli_num_fields()</B ></A ></TD ></TR ><TR ><TD ><A HREF="function.mysqli-fetch-field-direct.html" ><B CLASS="function" >mysqli_fetch_field_direct()</B ></A ></TD ></TR ><TR ><TD ><A HREF="function.mysqli-fetch-field.html" ><B CLASS="function" >mysqli_fetch_field()</B ></A ></TD ></TR ></TBODY ></TABLE ><P ></P > </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.mysqli-fetch-field.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.mysqli-fetch-lengths.html" ACCESSKEY="N" >下一页</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >mysqli_fetch_field</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ref.mysqli.html" ACCESSKEY="U" >上一级</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >mysqli_fetch_lengths</TD ></TR ></TABLE ></DIV ></BODY ></HTML >