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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision: 297028 $ -->
<!-- Generated by xml_proto.php v2.2. Found in /scripts directory of phpdoc. -->
<refentry xml:id="function.db2-lob-read" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>db2_lob_read</refname>
<refpurpose>
Gets a user defined size of LOB files with each invocation
</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>string</type><methodname>db2_lob_read</methodname>
<methodparam><type>resource</type><parameter>stmt</parameter></methodparam>
<methodparam><type>int</type><parameter>colnum</parameter></methodparam>
<methodparam><type>int</type><parameter>length</parameter></methodparam>
</methodsynopsis>
<para>
Use <function>db2_lob_read</function> to iterate through a specified column of
a result set and retrieve a user defined size of LOB data.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>stmt</parameter></term>
<listitem>
<para>
A valid <literal>stmt</literal> resource containing LOB data.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>colnum</parameter></term>
<listitem>
<para>
A valid column number in the result set of the <literal>stmt</literal> resource.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>length</parameter></term>
<listitem>
<para>
The size of the LOB data to be retrieved from the <literal>stmt</literal> resource.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
Returns the amount of data the user specifies. Returns
&false; if the data cannot be retrieved.
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title>Iterating through different types of data</title>
<para>
</para>
<programlisting role="php">
<![CDATA[
<?php
/* Database Connection Parameters */
$db = 'SAMPLE';
$username = 'db2inst1';
$password = 'ibmdb2';
/* Obtain Connection Resource */
$conn = db2_connect($db,$username,$password);
if ($conn) {
$drop = 'DROP TABLE clob_stream';
$result = @db2_exec( $conn, $drop );
$create = 'CREATE TABLE clob_stream (id INTEGER, my_clob CLOB)';
$result = db2_exec( $conn, $create );
$variable = "";
$stmt = db2_prepare($conn, "INSERT INTO clob_stream (id,my_clob) VALUES (1, ?)");
$variable = "THIS IS A CLOB TEST. THIS IS A CLOB TEST.";
db2_bind_param($stmt, 1, "variable", DB2_PARAM_IN);
db2_execute($stmt);
$sql = "SELECT id,my_clob FROM clob_stream";
$result = db2_prepare($conn, $sql);
db2_execute($result);
db2_fetch_row($result);
$i = 0;
/* Read LOB data */
while ($data = db2_lob_read($result, 2, 6)) {
echo "Loop $i: $data\n";
$i = $i + 1;
}
$drop = 'DROP TABLE blob_stream';
$result = @db2_exec( $conn, $drop );
$create = 'CREATE TABLE blob_stream (id INTEGER, my_blob CLOB)';
$result = db2_exec( $conn, $create );
$variable = "";
$stmt = db2_prepare($conn, "INSERT INTO blob_stream (id,my_blob) VALUES (1, ?)");
$variable = "THIS IS A BLOB TEST. THIS IS A BLOB TEST.";
db2_bind_param($stmt, 1, "variable", DB2_PARAM_IN);
db2_execute($stmt);
$sql = "SELECT id,my_blob FROM blob_stream";
$result = db2_prepare($conn, $sql);
db2_execute($result);
db2_fetch_row($result);
$i = 0;
/* Read LOB data */
while ($data = db2_lob_read($result, 2, 6)) {
echo "Loop $i: $data\n";
$i = $i + 1;
}
} else {
echo 'no connection: ' . db2_conn_errormsg();
}
?>
]]>
</programlisting>
&example.outputs;
<screen>
<![CDATA[
Loop 0: THIS I
Loop 1: S A CL
Loop 2: OB TES
Loop 3: T. THI
Loop 4: S IS A
Loop 5: CLOB
Loop 6: TEST.
Loop 0: THIS I
Loop 1: S A BL
Loop 2: OB TES
Loop 3: T. THI
Loop 4: S IS A
Loop 5: BLOB
Loop 6: TEST.
]]>
</screen>
</example>
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>db2_bind_param</function></member>
<member><function>db2_exec</function></member>
<member><function>db2_execute</function></member>
<member><function>db2_fetch_row</function></member>
<member><function>db2_prepare</function></member>
<member><function>db2_result</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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