php-doc-en/reference/cubrid/functions/cubrid-lob2-read.xml

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<refentry xml:id="function.cubrid-lob2-read" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
 <refnamediv>
  <refname>cubrid_lob2_read</refname>
  <refpurpose>Read from BLOB/CLOB data.</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>string</type><methodname>cubrid_lob2_read</methodname>
   <methodparam><type>resource</type><parameter>lob_identifier</parameter></methodparam>
   <methodparam><type>int</type><parameter>len</parameter></methodparam>
  </methodsynopsis>
  <para>
   The <function>cubrid_lob2_read</function> function reads <parameter>len</parameter> bytes from the LOB data, then return it.
  </para>
 </refsect1>

 <refsect1 role="parameters">
 &reftitle.parameters;
 <para>
  <variablelist>
   <varlistentry>
    <term><parameter>lob_identifier</parameter></term>
    <listitem>
     <para>Lob identifier as a result of <function>cubrid_lob2_new</function> or get from the result set.</para>
    </listitem>
   </varlistentry>
   <varlistentry>
    <term><parameter>len</parameter></term>
    <listitem>
     <para>Length from buffer you want to read from the lob data.</para>
    </listitem>
   </varlistentry>
  </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
    Returns the contents as a string.
  </para>
  <para>
    &false; when there is no more data.
  </para>
  <para>
    NULL on failure.
  </para>
  <para>
  </para>
 </refsect1>
 
 <refsect1 role="examples">
  &reftitle.examples;
  <example>
   <title><function>cubrid_lob2_read</function> example 1</title>
   <programlisting role="php">
<![CDATA[
<?php
// test_lob (id INT, contents CLOB)

$conn = cubrid_connect("localhost", 33000, "demodb", "public", "");

$req = cubrid_execute($conn, "select * from test_lob");

$row = cubrid_fetch_row($req, CUBRID_LOB);

print "position now is " . cubrid_lob2_tell($row[1]) . "\n";

cubrid_lob2_seek($row[1], 10, CUBRID_CURSOR_FIRST);

print "\nposition after moving forword is " . cubrid_lob2_tell($row[1]) . "\n";

$data = cubrid_lob2_read($lob, 12);

print "\nposition after reading is " . cubrid_lob2_tell($row[1]) . "\n";

print $data . "\n";

cubrid_lob2_seek($row[1], 5, CUBRID_CURSOR_CURRENT);

print "\nposition after moving again is " . cubrid_lob2_tell($row[1]) . "\n";

$data = cubrid_lob2_read($lob, 20);
print $data . "\n";

cubrid_disconnect($conn);
?>
]]>
   </programlisting>
  </example>
  
  <example>
   <title><function>cubrid_lob2_read</function> example 2</title>
   <programlisting role="php">
<![CDATA[
<?php
// test_lob (id INT, contents CLOB)

$conn = cubrid_connect("localhost", 33000, "demodb", "public", "");

$req = cubrid_execute($conn, "select * from test_lob");

$row = cubrid_fetch_row($req, CUBRID_LOB);

while (true) {
    if ($data = cubrid_lob2_read($lob, 1024)) {
        print $data . "\n";
    }
    elseif ($data === false) {
        print "There is no more data\n";
        break;
    }
    else {
        print "There must some errors\n";
        break;
    }
}

cubrid_disconnect($conn);
?>
]]>
   </programlisting>
  </example>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
   <member><function>cubrid_lob2_write</function></member>
   <member><function>cubrid_lob2_seek</function></member>
   <member><function>cubrid_lob2_seek64</function></member>
   <member><function>cubrid_lob2_tell</function></member>
   <member><function>cubrid_lob2_tell64</function></member>
   <member><function>cubrid_lob2_size</function></member>
   <member><function>cubrid_lob2_size64</function></member>
   </simplelist>
  </para>
 </refsect1>

</refentry>

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