<HTML ><HEAD ><TITLE >dba_exists</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.7"><LINK REL="HOME" TITLE="Manual de PHP" HREF="index.html"><LINK REL="UP" TITLE="Funciones de la capa de abstraccion de bases de datos (dbm-style)" HREF="ref.dba.html"><LINK REL="PREVIOUS" TITLE="dba_delete" HREF="function.dba-delete.html"><LINK REL="NEXT" TITLE="dba_fetch" HREF="function.dba-fetch.html"><META HTTP-EQUIV="Content-type" CONTENT="text/html; charset=ISO-8859-1"></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" >Manual de PHP</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="function.dba-delete.html" ACCESSKEY="P" >Anterior</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="function.dba-fetch.html" ACCESSKEY="N" >Siguiente</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="function.dba-exists" ></A >dba_exists</H1 ><DIV CLASS="refnamediv" ><A NAME="AEN11577" ></A ><P > (PHP 3>= 3.0.8, PHP 4 )</P >dba_exists -- Comprueba si la clave key existe</DIV ><DIV CLASS="refsect1" ><A NAME="AEN11580" ></A ><H2 >Descripcion</H2 >bool <B CLASS="methodname" >dba_exists</B > ( string key, int handle)<BR ></BR ><P > <B CLASS="function" >dba_exists()</B > comprueba si la clave <TT CLASS="parameter" ><I >key</I ></TT > existe en la base de datos especificada por <TT CLASS="parameter" ><I >handle</I ></TT >.</P ><P > <TT CLASS="parameter" ><I >key</I ></TT > es la clave para la que se realiza la comprobacion.</P ><P > <TT CLASS="parameter" ><I >handle</I ></TT > es un manejador (handle) de la base de datos devuelto por <A HREF="function.dba-open.html" ><B CLASS="function" >dba_open()</B ></A >.</P ><P > <B CLASS="function" >dba_exists()</B > devuelve <TT CLASS="constant" ><B >TRUE</B ></TT > o <TT CLASS="constant" ><B >FALSE</B ></TT >, si la clave es hallada o no, respectivamente.</P ><P > Ver tambien: <A HREF="function.dba-fetch.html" ><B CLASS="function" >dba_fetch()</B ></A > <A HREF="function.dba-delete.html" ><B CLASS="function" >dba_delete()</B ></A > <A HREF="function.dba-insert.html" ><B CLASS="function" >dba_insert()</B ></A > <A HREF="function.dba-replace.html" ><B CLASS="function" >dba_replace()</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.dba-delete.html" ACCESSKEY="P" >Anterior</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >Inicio</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="function.dba-fetch.html" ACCESSKEY="N" >Siguiente</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >dba_delete</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ref.dba.html" ACCESSKEY="U" >Subir</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >dba_fetch</TD ></TR ></TABLE ></DIV ></BODY ></HTML >