oci-field-is-null.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="function.oci-field-is-null" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>oci_field_is_null</refname>
  <refpurpose>Checks if a field in the currently fetched row is &null;</refpurpose>
 </refnamediv>
 
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>bool</type><methodname>oci_field_is_null</methodname>
   <methodparam><type>resource</type><parameter>statement</parameter></methodparam>
   <methodparam><type class="union"><type>string</type><type>int</type></type><parameter>column</parameter></methodparam>
  </methodsynopsis>
  <para>
   Checks if the given <parameter>column</parameter> from the current row of
   <parameter>statement</parameter> is &null;. 
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>statement</parameter></term>
     <listitem>
      <para>
       A valid OCI statement identifier.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>column</parameter></term>
     <listitem>
      <para>
       Can be the field's index (1-based) or name.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns &true; if <parameter>column</parameter> is &null;, &false; otherwise. 
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>oci_field_name</function> example</title>
    <programlisting role="php">
<![CDATA[
<?php

// Create the table with:
//   CREATE TABLE mytab (c1 NUMBER);
//   INSERT INTO mytab VALUES (1);
//   INSERT INTO mytab VALUES (NULL);

$conn = oci_connect("hr", "hrpwd", "localhost/XE");
if (!$conn) {
    $m = oci_error();
    trigger_error(htmlentities($m['message']), E_USER_ERROR);
}

$stid = oci_parse($conn, "SELECT * FROM mytab");
oci_execute($stid);

while (($row = oci_fetch_array($stid, OCI_RETURN_NULLS)) != false) {
    $ncols = oci_num_fields($stid);
    for ($col = 1; $col <= $ncols; $col++) {
        var_dump(oci_field_is_null($stid, $col));
    }    
}

// Outputs:
//    bool(false)
//    bool(true)

oci_free_statement($stid);
oci_close($conn);

?>
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>
</refentry>
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