<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >sqlite_fetch_single</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="SQLite Functions" HREF="ref.sqlite.html"><LINK REL="PREVIOUS" TITLE="sqlite_fetch_object" HREF="function.sqlite-fetch-object.html"><LINK REL="NEXT" TITLE="sqlite_fetch_string" HREF="function.sqlite-fetch-string.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.sqlite-fetch-object.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.sqlite-fetch-string.html" ACCESSKEY="N" >下一页</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="function.sqlite-fetch-single" ></A >sqlite_fetch_single</H1 ><DIV CLASS="refnamediv" ><A NAME="AEN216987" ></A ><P > (PHP 5)</P >sqlite_fetch_single<P > (no version information, might be only in CVS)</P >SQLiteResult->fetchSingle<P > (no version information, might be only in CVS)</P >SQLiteUnbuffered->fetchSingle -- Fetches the first column of a result set as a string</DIV ><DIV CLASS="refsect1" ><A NAME="AEN216992" ></A ><H2 >说明</H2 >string <B CLASS="methodname" >sqlite_fetch_single</B > ( resource result [, bool decode_binary] )<BR ></BR ><P >Object oriented style (method):</P >class <B CLASS="classname" >SQLiteResult</B > { <BR ></BR >string <B CLASS="methodname" >fetchSingle</B > ( [bool decode_binary] )<BR ></BR >}class <B CLASS="classname" >SQLiteUnbuffered</B > { <BR ></BR >string <B CLASS="methodname" >fetchSingle</B > ( [bool decode_binary] )<BR ></BR >}<P > <B CLASS="function" >sqlite_fetch_single()</B > is identical to <A HREF="function.sqlite-fetch-array.html" ><B CLASS="function" >sqlite_fetch_array()</B ></A > except that it returns the value of the first column of the rowset. </P ><P > 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" ><A NAME="AEN217026" ></A ><H2 >参数</H2 ><P > <P ></P ><DIV CLASS="variablelist" ><DL ><DT ><CODE CLASS="parameter" >result</CODE ></DT ><DD ><P > The SQLite result resource. This parameter is not required when using the object-oriented method. </P ></DD ><DT ><CODE CLASS="parameter" >decode_binary</CODE ></DT ><DD ><P >当 <CODE CLASS="parameter" >decode_binary</CODE > 参数设为 <TT CLASS="constant" ><B >TRUE</B ></TT >(默认值)时,PHP 将解码那些由 <A HREF="function.sqlite-escape-string.html" ><B CLASS="function" >sqlite_escape_string()</B ></A > 编码的数据。通常应保留此值为其默认值,除非在操作其它支持 sqlite 程序建立的数据库时。</P ></DD ></DL ></DIV > </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN217043" ></A ><H2 >范例</H2 ><P > <TABLE WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" CLASS="EXAMPLE" ><TR ><TD ><DIV CLASS="example" ><A NAME="AEN217046" ></A ><P ><B >例 1. A <B CLASS="function" >sqlite_fetch_single()</B > example</B ></P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" CELLPADDING="5" ><TR ><TD ><code><font color="#000000"> <font color="#0000BB"><?php<br /></font><font color="#007700">if (</font><font color="#0000BB">$dbhandle </font><font color="#007700">= </font><font color="#0000BB">sqlite_open</font><font color="#007700">(</font><font color="#DD0000">'mysqlitedb'</font><font color="#007700">, </font><font color="#0000BB">0666</font><font color="#007700">, </font><font color="#0000BB">$sqliteerror</font><font color="#007700">)) {<br /><br /> </font><font color="#0000BB">$sql </font><font color="#007700">= </font><font color="#DD0000">"SELECT id FROM sometable WHERE id = 42"</font><font color="#007700">;<br /> </font><font color="#0000BB">$res </font><font color="#007700">= </font><font color="#0000BB">sqlite_query</font><font color="#007700">(</font><font color="#0000BB">$dbhandle</font><font color="#007700">, </font><font color="#0000BB">$sql</font><font color="#007700">);<br /><br /> if (</font><font color="#0000BB">sqlite_num_rows</font><font color="#007700">(</font><font color="#0000BB">$res</font><font color="#007700">) > </font><font color="#0000BB">0</font><font color="#007700">) {<br /> echo </font><font color="#0000BB">sqlite_fetch_single</font><font color="#007700">(</font><font color="#0000BB">$res</font><font color="#007700">); </font><font color="#FF8000">// 42<br /> </font><font color="#007700">}<br /> <br /> </font><font color="#0000BB">sqlite_close</font><font color="#007700">(</font><font color="#0000BB">$dbhandle</font><font color="#007700">);<br />}<br /></font><font color="#0000BB">?></font> </font> </code></TD ></TR ></TABLE ></DIV ></TD ></TR ></TABLE > </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN217050" ></A ><H2 >参见</H2 ><P > <P ></P ><TABLE BORDER="0" ><TBODY ><TR ><TD ><A HREF="function.sqlite-fetch-array.html" ><B CLASS="function" >sqlite_fetch_array()</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.sqlite-fetch-object.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.sqlite-fetch-string.html" ACCESSKEY="N" >下一页</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >sqlite_fetch_object</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ref.sqlite.html" ACCESSKEY="U" >上一级</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >sqlite_fetch_string</TD ></TR ></TABLE ></DIV ></BODY ></HTML >