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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.6 $ -->
<!-- splitted from ./en/functions/fbsql.xml, last change in rev 1.28 -->
<refentry id="function.fbsql-read-blob">
<refnamediv>
<refname>fbsql_read_blob</refname>
<refpurpose>Read a BLOB from the database</refpurpose>
</refnamediv>
<refsect1>
&reftitle.description;
<methodsynopsis>
<type>string</type><methodname>fbsql_read_blob</methodname>
<methodparam><type>string</type><parameter>blob_handle</parameter></methodparam>
<methodparam choice="opt"><type>resource</type><parameter>
link_identifier
</parameter></methodparam>
</methodsynopsis>
<para>
Returns: A string containing the BLOB specified by blob_handle.
</para>
<para>
<function>fbsql_read_blob</function> reads BLOB data from the
database. If a select statement contains BLOB and/or CLOB
columns FrontBase will return the data directly when data is
fetched. This default behavior can be changed with
<function>fbsql_set_lob_mode</function> so the fetch functions
will return handles to BLOB and CLOB data. If a handle is
fetched a user must call <function>fbsql_read_blob</function> to
get the actual BLOB data from the database.
</para>
<example>
<title><function>fbsql_read_blob</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
$link = fbsql_pconnect("localhost", "_SYSTEM", "secret")
or die("Could not connect");
$sql = "SELECT BLOB_COLUMN FROM BLOB_TABLE;";
$rs = fbsql_query($sql, $link);
$row_data = fbsql_fetch_row($rs);
// $row_data[0] will now contain the blob data for the first row
fbsql_free_result($rs);
$rs = fbsql_query($sql, $link);
fbsql_set_lob_mode($rs, FBSQL_LOB_HANDLE);
$row_data = fbsql_fetch_row($rs);
// $row_data[0] will now contain a handle to the BLOB data in the first row
$blob_data = fbsql_read_blob($row_data[0]);
fbsql_free_result($rs);
?>
]]>
</programlisting>
</example>
<para>
See also: <function>fbsql_create_blob</function>,
<function>fbsql_read_clob</function>, and
<function>fbsql_set_lob_mode</function>.
</para>
</refsect1>
</refentry>
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