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>mysqli_field_count</H1
><DIV
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><A
NAME="AEN134219"
></A
><P
> (PHP 5)</P
>mysqli_field_count<P
> (no version information, might be only in CVS)</P
>mysqli->field_count -- Retorna o número de colunas para a consulta mais recente</DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN134223"
></A
><H2
>Descrição</H2
><P
>Estilo de procedimento:</P
>int <B
CLASS="methodname"
>mysqli_field_count</B
> ( object link )<BR
></BR
><P
>Estilo orientado a objeto (metodo):</P
>class <B
CLASS="classname"
>mysql</B
> { <BR
></BR
>int <B
CLASS="methodname"
>field_count</B
> ( void )<BR
></BR
>}<P
> Retorna o número de colunas para a consulta mais recente na conexão
representada pelo parâmetro <CODE
CLASS="parameter"
>link</CODE
>. Esta função
pode ser útil ao usar a função <A
HREF="function.mysqli-store-result.html"
><B
CLASS="function"
>mysqli_store_result()</B
></A
>
para determinar se a consulta produziu um conjunto de resultados vazio ou não
sem conhecer a natureza da consulta.
</P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN134243"
></A
><H2
>Valores de retorno</H2
><P
>Um inteiro representando o número de campos no conjunto de resultados</P
></DIV
><DIV
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><A
NAME="AEN134246"
></A
><H2
>Exemplo</H2
><P
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><P
><B
>Exemplo 1. Estilo orientado a objeto</B
></P
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><code><font color="#000000">
<font color="#0000BB"><?php<br />$mysqli </font><font color="#007700">= new </font><font color="#0000BB">mysqli</font><font color="#007700">(</font><font color="#DD0000">"localhost"</font><font color="#007700">, </font><font color="#DD0000">"my_user"</font><font color="#007700">, </font><font color="#DD0000">"my_password"</font><font color="#007700">, </font><font color="#DD0000">"test"</font><font color="#007700">);<br /><br /></font><font color="#0000BB">$mysqli</font><font color="#007700">-></font><font color="#0000BB">query</font><font color="#007700">( </font><font color="#DD0000">"DROP TABLE IF EXISTS friends"</font><font color="#007700">); <br /></font><font color="#0000BB">$mysqli</font><font color="#007700">-></font><font color="#0000BB">query</font><font color="#007700">( </font><font color="#DD0000">"CREATE TABLE friends (id int, name varchar(20))"</font><font color="#007700">); <br /> <br /></font><font color="#0000BB">$mysqli</font><font color="#007700">-></font><font color="#0000BB">query</font><font color="#007700">( </font><font color="#DD0000">"INSERT INTO friends VALUES (1,'Hartmut'), (2, 'Ulf')"</font><font color="#007700">);<br /><br /><br /></font><font color="#0000BB">$mysqli</font><font color="#007700">-></font><font color="#0000BB">real_query</font><font color="#007700">(</font><font color="#0000BB">$HTTP_POST_VARS</font><font color="#007700">[</font><font color="#DD0000">'query'</font><font color="#007700">]);<br /><br />if (</font><font color="#0000BB">mysqli_field_count</font><font color="#007700">(</font><font color="#0000BB">$link</font><font color="#007700">)) {<br /> </font><font color="#FF8000">/* this was a select/show or describe query */<br /> </font><font color="#0000BB">$result </font><font color="#007700">= </font><font color="#0000BB">$mysqli</font><font color="#007700">-></font><font color="#0000BB">store_result</font><font color="#007700">();<br /> <br /> </font><font color="#FF8000">/* process resultset */<br /> </font><font color="#0000BB">$row </font><font color="#007700">= </font><font color="#0000BB">$result</font><font color="#007700">-></font><font color="#0000BB">fetch_row</font><font color="#007700">();<br /><br /> </font><font color="#FF8000">/* free resultset */<br /> </font><font color="#0000BB">$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">$mysqli</font><font color="#007700">-></font><font color="#0000BB">close</font><font color="#007700">();<br /></font><font color="#0000BB">?></font>
</font>
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><P
><B
>Exemplo 2. Estilo de procedimento</B
></P
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><code><font color="#000000">
<font color="#0000BB"><?php<br />$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">"test"</font><font color="#007700">);<br /><br /></font><font color="#0000BB">mysqli_query</font><font color="#007700">(</font><font color="#0000BB">$link</font><font color="#007700">, </font><font color="#DD0000">"DROP TABLE IF EXISTS friends"</font><font color="#007700">); <br /></font><font color="#0000BB">mysqli_query</font><font color="#007700">(</font><font color="#0000BB">$link</font><font color="#007700">, </font><font color="#DD0000">"CREATE TABLE friends (id int, name varchar(20))"</font><font color="#007700">); <br /> <br /></font><font color="#0000BB">mysqli_query</font><font color="#007700">(</font><font color="#0000BB">$link</font><font color="#007700">, </font><font color="#DD0000">"INSERT INTO friends VALUES (1,'Hartmut'), (2, 'Ulf')"</font><font color="#007700">);<br /><br /></font><font color="#0000BB">mysqli_real_query</font><font color="#007700">(</font><font color="#0000BB">$link</font><font color="#007700">, </font><font color="#0000BB">$HTTP_POST_VARS</font><font color="#007700">[</font><font color="#DD0000">'query'</font><font color="#007700">]);<br /><br />if (</font><font color="#0000BB">mysqli_field_count</font><font color="#007700">(</font><font color="#0000BB">$link</font><font color="#007700">)) {<br /> </font><font color="#FF8000">/* this was a select/show or describe query */<br /> </font><font color="#0000BB">$result </font><font color="#007700">= </font><font color="#0000BB">mysqli_store_result</font><font color="#007700">(</font><font color="#0000BB">$link</font><font color="#007700">);<br /> <br /> </font><font color="#FF8000">/* process resultset */<br /> </font><font color="#0000BB">$row </font><font color="#007700">= </font><font color="#0000BB">mysqli_fetch_row</font><font color="#007700">(</font><font color="#0000BB">$result</font><font color="#007700">);<br /><br /> </font><font color="#FF8000">/* free resultset */<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>
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