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><H1
><A
NAME="function.PDO-sqliteCreateFunction"
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>PDO-&#62;sqliteCreateFunction()</H1
><DIV
CLASS="refnamediv"
><A
NAME="AEN218467"
></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="AEN218470"
></A
><H2
>说明</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
>警告</B
></TD
></TR
><TR
><TD
ALIGN="LEFT"
><P
>本函数是<SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>实验性</I
></SPAN
>的。本函数的行为，包括函数名称以及其它任何关于本函数的文档可能会在没有通知的情况下随
PHP 以后的发布而改变。使用本函数风险自担。</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="AEN218493"
></A
><H2
>参数</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
>注意: </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
>注意: </B
>为兼容其它数据库（例如
MySQL），支持另两种替代的语法。推荐用第一种，<CODE
CLASS="parameter"
>dbhandle</CODE
>
参数作为函数的第一个参数。</P
></BLOCKQUOTE
></DIV
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN218518"
></A
><H2
>返回值</H2
><P
>&#13;   如果成功则返回 <TT
CLASS="constant"
><B
>TRUE</B
></TT
>，失败则返回 <TT
CLASS="constant"
><B
>FALSE</B
></TT
>。
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN218523"
></A
><H2
>范例</H2
><P
>&#13;   <TABLE
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><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN218526"
></A
><P
><B
>例 1. <B
CLASS="function"
>PDO::sqliteCreateFunction()</B
> example</B
></P
><TABLE
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BGCOLOR="#E0E0E0"
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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
>提示: </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
>注意: </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="AEN218539"
></A
><H2
>参见</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
></P
>
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