db2-lob-read.xml

<?xml version="1.0" encoding="utf-8"?>
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<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 class="union"><type>string</type><type>false</type></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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