<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<HTML
><HEAD
><TITLE
>pg_field_is_null</TITLE
><META
NAME="GENERATOR"
CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK
REL="HOME"
TITLE="Manual do PHP"
HREF="index.html"><LINK
REL="UP"
TITLE="PostgreSQL"
HREF="ref.pgsql.html"><LINK
REL="PREVIOUS"
TITLE="pg_fetch_row"
HREF="function.pg-fetch-row.html"><LINK
REL="NEXT"
TITLE="pg_field_name"
HREF="function.pg-field-name.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"
>Manual do PHP</TH
></TR
><TR
><TD
WIDTH="10%"
ALIGN="left"
VALIGN="bottom"
><A
HREF="function.pg-fetch-row.html"
ACCESSKEY="P"
>Anterior</A
></TD
><TD
WIDTH="80%"
ALIGN="center"
VALIGN="bottom"
></TD
><TD
WIDTH="10%"
ALIGN="right"
VALIGN="bottom"
><A
HREF="function.pg-field-name.html"
ACCESSKEY="N"
>Próxima</A
></TD
></TR
></TABLE
><HR
ALIGN="LEFT"
WIDTH="100%"></DIV
><H1
><A
NAME="function.pg-field-is-null"
></A
>pg_field_is_null</H1
><DIV
CLASS="refnamediv"
><A
NAME="AEN181054"
></A
><P
> (PHP 4 >= 4.2.0, PHP 5)</P
>pg_field_is_null -- Testa se o campo é <TT
CLASS="constant"
><B
>NULL</B
></TT
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN181058"
></A
><H2
>Descrição</H2
>int <B
CLASS="methodname"
>pg_field_is_null</B
> ( resource result, int row, mixed field )<BR
></BR
><P
> <B
CLASS="function"
>pg_field_is_null()</B
> testa se um campo é <TT
CLASS="constant"
><B
>NULL</B
></TT
> ou não.
Retorna 1 se o campo na linha dada é <TT
CLASS="constant"
><B
>NULL</B
></TT
>. Retorna 0 se o campo
na linha dada NÃO é <TT
CLASS="constant"
><B
>NULL</B
></TT
>. O campo pode ser especificado como um índice
de coluna (número) ou como o nome de um campo (string). A numeração de
linhas inicia-se em 0.
</P
><P
> <TABLE
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
CLASS="EXAMPLE"
><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN181078"
></A
><P
><B
>Exemplo 1. <B
CLASS="function"
>pg_field_is_null()</B
> example</B
></P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><code><font color="#000000">
<font color="#0000BB"><?php<br /> $dbconn </font><font color="#007700">= </font><font color="#0000BB">pg_connect</font><font color="#007700">(</font><font color="#DD0000">"dbname=publisher"</font><font color="#007700">) or die (</font><font color="#DD0000">"Não foi possível conectar"</font><font color="#007700">);<br /> </font><font color="#0000BB">$res </font><font color="#007700">= </font><font color="#0000BB">pg_query</font><font color="#007700">(</font><font color="#0000BB">$dbconn</font><font color="#007700">, </font><font color="#DD0000">"select * from authors where author = 'Orwell'"</font><font color="#007700">);<br /> if (</font><font color="#0000BB">$res</font><font color="#007700">) {<br /> if (</font><font color="#0000BB">pg_field_is_null</font><font color="#007700">(</font><font color="#0000BB">$res</font><font color="#007700">, </font><font color="#0000BB">0</font><font color="#007700">, </font><font color="#DD0000">"ano"</font><font color="#007700">) == </font><font color="#0000BB">1</font><font color="#007700">) {<br /> echo </font><font color="#DD0000">"O valor do campo ano é null.\n"</font><font color="#007700">;<br /> }<br /> if (</font><font color="#0000BB">pg_field_is_null</font><font color="#007700">(</font><font color="#0000BB">$res</font><font color="#007700">, </font><font color="#0000BB">0</font><font color="#007700">, </font><font color="#DD0000">"ano"</font><font color="#007700">) == </font><font color="#0000BB">0</font><font color="#007700">) {<br /> echo </font><font color="#DD0000">"O valor do campo ano não é null.\n"</font><font color="#007700">;<br /> }<br /> }<br /></font><font color="#0000BB">?></font>
</font>
</code></TD
></TR
></TABLE
></DIV
></TD
></TR
></TABLE
>
</P
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>Nota: </B
>
Esta função era chamada <TT
CLASS="literal"
>pg_fieldisnull()</TT
>.
</P
></BLOCKQUOTE
></DIV
></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-fetch-row.html"
ACCESSKEY="P"
>Anterior</A
></TD
><TD
WIDTH="34%"
ALIGN="center"
VALIGN="top"
><A
HREF="index.html"
ACCESSKEY="H"
>Principal</A
></TD
><TD
WIDTH="33%"
ALIGN="right"
VALIGN="top"
><A
HREF="function.pg-field-name.html"
ACCESSKEY="N"
>Próxima</A
></TD
></TR
><TR
><TD
WIDTH="33%"
ALIGN="left"
VALIGN="top"
>pg_fetch_row</TD
><TD
WIDTH="34%"
ALIGN="center"
VALIGN="top"
><A
HREF="ref.pgsql.html"
ACCESSKEY="U"
>Acima</A
></TD
><TD
WIDTH="33%"
ALIGN="right"
VALIGN="top"
>pg_field_name</TD
></TR
></TABLE
></DIV
></BODY
></HTML
>
