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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="function.oci-new-descriptor" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>oci_new_descriptor</refname>
<refpurpose>Initializes a new empty LOB or FILE descriptor</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type class="union"><type>OCILob</type><type>null</type></type><methodname>oci_new_descriptor</methodname>
<methodparam><type>resource</type><parameter>connection</parameter></methodparam>
<methodparam choice="opt"><type>int</type><parameter>type</parameter><initializer><constant>OCI_DTYPE_LOB</constant></initializer></methodparam>
</methodsynopsis>
<para>
Allocates resources to hold descriptor or LOB locator.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>connection</parameter></term>
<listitem>
<para>
An Oracle connection identifier, returned by
<function>oci_connect</function> or <function>oci_pconnect</function>.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>type</parameter></term>
<listitem>
<para>
Valid values for <parameter>type</parameter> are:
<constant>OCI_DTYPE_FILE</constant>, <constant>OCI_DTYPE_LOB</constant> and
<constant>OCI_DTYPE_ROWID</constant>.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
Returns a new LOB or FILE descriptor on success, or &null; on failure.
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title><function>oci_new_descriptor</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
/* This script is designed to be called from a HTML form.
* It expects $user, $password, $table, $where, and $commitsize
* to be passed in from the form. The script then deletes
* the selected rows using the ROWID and commits after each
* set of $commitsize rows. (Use with care, there is no rollback)
*/
$conn = oci_connect($user, $password);
$stmt = oci_parse($conn, "select rowid from $table $where");
$rowid = oci_new_descriptor($conn, OCI_D_ROWID);
oci_define_by_name($stmt, "ROWID", $rowid);
oci_execute($stmt);
while (oci_fetch($stmt)) {
$nrows = oci_num_rows($stmt);
$delete = oci_parse($conn, "delete from $table where ROWID = :rid");
oci_bind_by_name($delete, ":rid", $rowid, -1, OCI_B_ROWID);
oci_execute($delete);
echo "$nrows\n";
if (($nrows % $commitsize) == 0) {
oci_commit($conn);
}
}
$nrows = oci_num_rows($stmt);
echo "$nrows deleted...\n";
oci_free_statement($stmt);
oci_close($conn);
?>
]]>
</programlisting>
<programlisting role="php">
<![CDATA[
<?php
/* This script demonstrates file upload to LOB columns
* The formfield used for this example looks like this
* <form action="upload.php" method="post" enctype="multipart/form-data">
* <input type="file" name="lob_upload" />
* ...
*/
if (!isset($lob_upload) || $lob_upload == 'none'){
?>
<form action="upload.php" method="post" enctype="multipart/form-data">
Upload file: <input type="file" name="lob_upload" /><br />
<input type="submit" value="Upload" /> - <input type="reset" value="Reset" />
</form>
<?php
} else {
// $lob_upload contains the temporary filename of the uploaded file
// see also the features section on file upload,
// if you would like to use secure uploads
$conn = oci_connect($user, $password);
$lob = oci_new_descriptor($conn, OCI_D_LOB);
$stmt = oci_parse($conn, "insert into $table (id, the_blob)
values(my_seq.NEXTVAL, EMPTY_BLOB()) returning the_blob into :the_blob");
oci_bind_by_name($stmt, ':the_blob', $lob, -1, OCI_B_BLOB);
oci_execute($stmt, OCI_DEFAULT);
if ($lob->savefile($lob_upload)){
oci_commit($conn);
echo "Blob successfully uploaded\n";
}else{
echo "Couldn't upload Blob\n";
}
$lob->free();
oci_free_statement($stmt);
oci_close($conn);
}
?>
]]>
</programlisting>
</example>
<example>
<title><function>oci_new_descriptor</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
/* Calling PL/SQL stored procedures which contain clobs as input
* parameters.
* Example PL/SQL stored procedure signature is:
*
* PROCEDURE save_data
* Argument Name Type In/Out Default?
* ------------------------------ ----------------------- ------ --------
* KEY NUMBER(38) IN
* DATA CLOB IN
*
*/
$conn = oci_connect($user, $password);
$stmt = oci_parse($conn, "begin save_data(:key, :data); end;");
$clob = oci_new_descriptor($conn, OCI_D_LOB);
oci_bind_by_name($stmt, ':key', $key);
oci_bind_by_name($stmt, ':data', $clob, -1, OCI_B_CLOB);
$clob->write($data);
oci_execute($stmt, OCI_DEFAULT);
oci_commit($conn);
$clob->free();
oci_free_statement($stmt);
?>
]]>
</programlisting>
</example>
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>oci_bind_by_name</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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-->
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