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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.4 $ -->
<!-- splitted from ./en/functions/uodbc.xml, last change in rev 1.2 -->
<refentry id="function.odbc-binmode">
<refnamediv>
<refname>odbc_binmode</refname>
<refpurpose>Handling of binary column data</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<methodsynopsis>
<type>bool</type><methodname>odbc_binmode</methodname>
<methodparam><type>resource</type><parameter>result_id</parameter></methodparam>
<methodparam><type>int</type><parameter>mode</parameter></methodparam>
</methodsynopsis>
<para>
(ODBC SQL types affected: BINARY, VARBINARY, LONGVARBINARY)
</para>
<itemizedlist>
<listitem>
<simpara>
ODBC_BINMODE_PASSTHRU: Passthru BINARY data
</simpara>
</listitem>
<listitem>
<simpara>
ODBC_BINMODE_RETURN: Return as is
</simpara>
</listitem>
<listitem>
<simpara>
ODBC_BINMODE_CONVERT: Convert to char and return
</simpara>
</listitem>
</itemizedlist>
<para>
When binary SQL data is converted to character C data, each byte
(8 bits) of source data is represented as two ASCII characters.
These characters are the ASCII character representation of the
number in its hexadecimal form. For example, a binary 00000001 is
converted to <literal>"01"</literal> and a binary 11111111 is
converted to <literal>"FF"</literal>.
<table>
<title>LONGVARBINARY handling</title>
<tgroup cols="3">
<thead>
<row>
<entry>binmode</entry>
<entry>longreadlen</entry>
<entry>result</entry>
</row>
</thead>
<tbody>
<row>
<entry>ODBC_BINMODE_PASSTHRU</entry>
<entry>0</entry>
<entry>passthru</entry>
</row>
<row>
<entry>ODBC_BINMODE_RETURN</entry>
<entry>0</entry>
<entry>passthru</entry>
</row>
<row>
<entry>ODBC_BINMODE_CONVERT</entry>
<entry>0</entry>
<entry>passthru</entry>
</row>
<row>
<entry>ODBC_BINMODE_PASSTHRU</entry>
<entry>0</entry>
<entry>passthru</entry>
</row>
<row>
<entry>ODBC_BINMODE_PASSTHRU</entry>
<entry>>0</entry>
<entry>passthru</entry>
</row>
<row>
<entry>ODBC_BINMODE_RETURN</entry>
<entry>>0</entry>
<entry>return as is</entry>
</row>
<row>
<entry>ODBC_BINMODE_CONVERT</entry>
<entry>>0</entry>
<entry>return as char</entry>
</row>
</tbody>
</tgroup>
</table>
</para>
<para>
If <function>odbc_fetch_into</function> is used, passthru means
that an empty string is returned for these columns.
</para>
<para>
If <parameter>result_id</parameter> is <literal>0</literal>, the
settings apply as default for new results.
<note>
<simpara>
Default for longreadlen is <literal>4096</literal> and binmode
defaults to <literal>ODBC_BINMODE_RETURN</literal>. Handling
of binary long columns is also affected by
<function>odbc_longreadlen</function>
</simpara>
</note>
</para>
</refsect1>
</refentry>
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