<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >pg_prepare</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="PostgreSQL 数据库函数" HREF="ref.pgsql.html"><LINK REL="PREVIOUS" TITLE="pg_port" HREF="function.pg-port.html"><LINK REL="NEXT" TITLE="pg_put_line" HREF="function.pg-put-line.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.pg-port.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.pg-put-line.html" ACCESSKEY="N" >下一页</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="function.pg-prepare" ></A >pg_prepare</H1 ><DIV CLASS="refnamediv" ><A NAME="AEN186446" ></A ><P > (PHP 5 >= 5.1.0RC1)</P >pg_prepare -- Submits a request to create a prepared statement with the given parameters, and waits for completion.</DIV ><DIV CLASS="refsect1" ><A NAME="AEN186449" ></A ><H2 >说明</H2 >resource <B CLASS="methodname" >pg_prepare</B > ( resource connection, string stmtname, string query )<BR ></BR >resource <B CLASS="methodname" >pg_prepare</B > ( string stmtname, string query )<BR ></BR ><P > <B CLASS="function" >pg_prepare()</B > creates a prepared statement for later execution with <A HREF="function.pg-execute.html" ><B CLASS="function" >pg_execute()</B ></A > or <A HREF="function.pg-send-execute.html" ><B CLASS="function" >pg_send_execute()</B ></A >. This feature allows commands that will be used repeatedly to be parsed and planned just once, rather than each time they are executed. <B CLASS="function" >pg_prepare()</B > is supported only against PostgreSQL 7.4 or higher connections; it will fail when using earlier versions. </P ><P > The function creates a prepared statement named <CODE CLASS="parameter" >stmtname</CODE > from the <CODE CLASS="parameter" >query</CODE > string, which must contain a single SQL command. <CODE CLASS="parameter" >stmtname</CODE > may be "" to create an unnamed statement, in which case any pre-existing unnamed statement is automatically replaced; otherwise it is an error if the statement name is already defined in the current session. If any parameters are used, they are referred to in the <CODE CLASS="parameter" >query</CODE > as $1, $2, etc. </P ><P > Prepared statements for use with <B CLASS="function" >pg_prepare()</B > can also be created by executing SQL <TT CLASS="literal" >PREPARE</TT > statements. (But <B CLASS="function" >pg_prepare()</B > is more flexible since it does not require parameter types to be pre-specified.) Also, although there is no PHP function for deleting a prepared statement, the SQL <TT CLASS="literal" >DEALLOCATE</TT > statement can be used for that purpose. </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN186487" ></A ><H2 >参数</H2 ><P > <P ></P ><DIV CLASS="variablelist" ><DL ><DT ><CODE CLASS="parameter" >connection</CODE ></DT ><DD ><P > PostgreSQL database connection resource. When <CODE CLASS="parameter" >connection</CODE > is not present, the default connection is used. The default connection is the last connection made by <A HREF="function.pg-connect.html" ><B CLASS="function" >pg_connect()</B ></A > or <A HREF="function.pg-pconnect.html" ><B CLASS="function" >pg_pconnect()</B ></A >. </P ></DD ><DT ><CODE CLASS="parameter" >stmtname</CODE ></DT ><DD ><P > The name to give the prepared statement. Must be unique per-connection. If "" is specified, then an unnamed statement is created, overwriting any previously defined unnamed statement. </P ></DD ><DT ><CODE CLASS="parameter" >query</CODE ></DT ><DD ><P > The parameterised SQL statement. Must contain only a single statement. (multiple statements separated by semi-colons are not allowed.) If any parameters are used, they are referred to as $1, $2, etc. </P ></DD ></DL ></DIV > </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN186509" ></A ><H2 >返回值</H2 ><P > A query result resource on success, or <TT CLASS="constant" ><B >FALSE</B ></TT > on failure. </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN186513" ></A ><H2 >范例</H2 ><P > <TABLE WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" CLASS="EXAMPLE" ><TR ><TD ><DIV CLASS="example" ><A NAME="AEN186516" ></A ><P ><B >例 1. Using <B CLASS="function" >pg_prepare()</B ></B ></P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" CELLPADDING="5" ><TR ><TD ><code><font color="#000000"> <font color="#0000BB"><?php<br /></font><font color="#FF8000">// Connect to a database named "mary"<br /></font><font color="#0000BB">$dbconn </font><font color="#007700">= </font><font color="#0000BB">pg_connect</font><font color="#007700">(</font><font color="#DD0000">"dbname=mary"</font><font color="#007700">);<br /><br /></font><font color="#FF8000">// Prepare a query for execution<br /></font><font color="#0000BB">$result </font><font color="#007700">= </font><font color="#0000BB">pg_prepare</font><font color="#007700">(</font><font color="#0000BB">$dbconn</font><font color="#007700">, </font><font color="#DD0000">"my_query"</font><font color="#007700">, </font><font color="#DD0000">'SELECT * FROM shops WHERE name = $1'</font><font color="#007700">);<br /><br /></font><font color="#FF8000">// Execute the prepared query. Note that it is not necessary to escape<br />// the string "Joe's Widgets" in any way<br /></font><font color="#0000BB">$result </font><font color="#007700">= </font><font color="#0000BB">pg_execute</font><font color="#007700">(</font><font color="#0000BB">$dbconn</font><font color="#007700">, </font><font color="#DD0000">"my_query"</font><font color="#007700">, array(</font><font color="#DD0000">"Joe's Widgets"</font><font color="#007700">));<br /><br /></font><font color="#FF8000">// Execute the same prepared query, this time with a different parameter<br /></font><font color="#0000BB">$result </font><font color="#007700">= </font><font color="#0000BB">pg_execute</font><font color="#007700">(</font><font color="#0000BB">$dbconn</font><font color="#007700">, </font><font color="#DD0000">"my_query"</font><font color="#007700">, array(</font><font color="#DD0000">"Clothes Clothes Clothes"</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="AEN186520" ></A ><H2 >参见</H2 ><P > <P ></P ><TABLE BORDER="0" ><TBODY ><TR ><TD ><A HREF="function.pg-execute.html" ><B CLASS="function" >pg_execute()</B ></A ></TD ></TR ><TR ><TD ><A HREF="function.pg-send-execute.html" ><B CLASS="function" >pg_send_execute()</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.pg-port.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.pg-put-line.html" ACCESSKEY="N" >下一页</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >pg_port</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ref.pgsql.html" ACCESSKEY="U" >上一级</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >pg_put_line</TD ></TR ></TABLE ></DIV ></BODY ></HTML >