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php-manual-pt_BR-5.2.4-1mdv2008.1.noarch.rpm

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><A
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>PDO-&#62;sqliteCreateFunction()</H1
><DIV
CLASS="refnamediv"
><A
NAME="AEN212352"
></A
><P
>    (no version information, might be only in CVS)</P
>PDO-&#62;sqliteCreateFunction()&nbsp;--&nbsp;
   Registers a User Defined Function for use in SQL statements
  </DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN212355"
></A
><H2
>Descrição</H2
>class <B
CLASS="classname"
>PDO</B
> { <BR
></BR
>bool <B
CLASS="methodname"
>sqliteCreateFunction</B
> ( string function_name, callback callback [, int num_args] )<BR
></BR
>}<DIV
CLASS="warning"
><P
></P
><TABLE
CLASS="warning"
BORDER="1"
WIDTH="100%"
><TR
><TD
ALIGN="CENTER"
><B
>Atenção</B
></TD
></TR
><TR
><TD
ALIGN="LEFT"
><P
>Esta função é
 <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>EXPERIMENTAL</I
></SPAN
>. Isso quer dizer que o comportamento desta função
 e seu nome, incluindo TUDO o que está documentado aqui
 pode mudar em futuras versões do PHP, SEM QUALQUER NOTIFICAÇÃO.
 Esteja avisado, e use esta função por sua própria conta e risco.</P
></TD
></TR
></TABLE
></DIV
><P
>&#13;   This method allows you to register a PHP function with SQLite as an 
   <ACRONYM
CLASS="acronym"
>UDF</ACRONYM
> (User Defined Function), so that it can be called
   from within your SQL statements.
  </P
><P
>&#13;   The UDF can be used in any SQL statement that can call functions, such as
   SELECT and UPDATE statements and also in triggers.
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN212378"
></A
><H2
>Parâmetros</H2
><P
>&#13;   <P
></P
><DIV
CLASS="variablelist"
><DL
><DT
><CODE
CLASS="parameter"
>function_name</CODE
></DT
><DD
><P
>&#13;       The name of the function used in SQL statements.
      </P
></DD
><DT
><CODE
CLASS="parameter"
>callback</CODE
></DT
><DD
><P
>&#13;       Callback function to handle the defined SQL function.
      </P
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>Nota: </B
>
        Callback functions should return a type understood by SQLite (i.e.
        <A
HREF="language.types.html#language.types.intro"
>scalar type</A
>).
       </P
></BLOCKQUOTE
></DIV
></DD
><DT
><CODE
CLASS="parameter"
>num_args</CODE
></DT
><DD
><P
>&#13;       Hint to the SQLite parser if the callback function accepts a
       predetermined number of arguments.
      </P
></DD
></DL
></DIV
>
  </P
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>Nota: </B
>Duas sintaxes alternativas são
 suportaas para compatibilidade com outras extensões de banco de dados( como o MySQL).
 A forma preferida é a primeira, aonde o parâmetro <CODE
CLASS="parameter"
>dbhandle</CODE
>
 é o primeiro parãmetro da função.</P
></BLOCKQUOTE
></DIV
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN212403"
></A
><H2
>Valores de retornado</H2
><P
>&#13;   Retorna <TT
CLASS="constant"
><B
>TRUE</B
></TT
> em caso de sucesso ou <TT
CLASS="constant"
><B
>FALSE</B
></TT
> em falhas.
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN212408"
></A
><H2
>Exemplos</H2
><P
>&#13;   <TABLE
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
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CLASS="EXAMPLE"
><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN212411"
></A
><P
><B
>Exemplo 1. <B
CLASS="function"
>PDO::sqliteCreateFunction()</B
> example</B
></P
><TABLE
BORDER="0"
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><TD
><code><font color="#000000">
<font color="#0000BB">&lt;?php<br /></font><font color="#007700">function </font><font color="#0000BB">md5_and_reverse</font><font color="#007700">(</font><font color="#0000BB">$string</font><font color="#007700">) <br />{<br />&nbsp;&nbsp;&nbsp;&nbsp;return </font><font color="#0000BB">strrev</font><font color="#007700">(</font><font color="#0000BB">md5</font><font color="#007700">(</font><font color="#0000BB">$string</font><font color="#007700">));<br />}<br /><br /></font><font color="#0000BB">$db </font><font color="#007700">= new </font><font color="#0000BB">PDO</font><font color="#007700">(</font><font color="#DD0000">'sqlite:sqlitedb'</font><font color="#007700">);<br /></font><font color="#0000BB">$db</font><font color="#007700">-&gt;</font><font color="#0000BB">sqliteCreateFunction</font><font color="#007700">(</font><font color="#DD0000">'md5rev'</font><font color="#007700">, </font><font color="#DD0000">'md5_and_reverse'</font><font color="#007700">, </font><font color="#0000BB">1</font><font color="#007700">);<br /></font><font color="#0000BB">$rows </font><font color="#007700">= </font><font color="#0000BB">$db</font><font color="#007700">-&gt;</font><font color="#0000BB">query</font><font color="#007700">(</font><font color="#DD0000">'SELECT md5rev(filename) FROM files'</font><font color="#007700">)-&gt;</font><font color="#0000BB">fetchAll</font><font color="#007700">();<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
></TR
></TABLE
></DIV
></TD
></TR
></TABLE
>
  </P
><P
>&#13;   In this example, we have a function that calculates the md5 sum of a
   string, and then reverses it.  When the SQL statement executes, it
   returns the value of the filename transformed by our function.  The data
   returned in <CODE
CLASS="parameter"
>$rows</CODE
> contains the processed result.
  </P
><P
>&#13;   The beauty of this technique is that you do not need to process the
   result using a foreach() loop after you have queried for the data.
  </P
><DIV
CLASS="tip"
><BLOCKQUOTE
CLASS="tip"
><P
><B
>Dica: </B
>
    You can use <A
HREF="function.pdo-sqlitecreatefunction.html"
>PDO-&#62;sqliteCreateFunction()</A
> and
    <A
HREF="function.pdo-sqlitecreateaggregate.html"
>PDO-&#62;sqliteCreateAggregate()</A
> to override SQLite
    native SQL functions.
   </P
></BLOCKQUOTE
></DIV
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>Nota: </B
>
    This method is not available with the SQLite2 driver.
    Use the old style sqlite API for that instead.
   </P
></BLOCKQUOTE
></DIV
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN212424"
></A
><H2
>Veja também</H2
><P
>&#13;   <P
></P
><TABLE
BORDER="0"
><TBODY
><TR
><TD
><A
HREF="function.pdo-sqlitecreateaggregate.html"
>PDO-&#62;sqliteCreateAggregate()</A
></TD
></TR
><TR
><TD
><A
HREF="function.sqlite-create-function.html"
><B
CLASS="function"
>sqlite_create_function()</B
></A
></TD
></TR
><TR
><TD
><A
HREF="function.sqlite-create-aggregate.html"
><B
CLASS="function"
>sqlite_create_aggregate()</B
></A
></TD
></TR
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></P
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