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<refentry id="function.db2-special-columns">
 <refnamediv>
  <refname>db2_special_columns</refname>
  <refpurpose>
   Returns a result set listing the unique row identifier columns for a table
  </refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>resource</type><methodname>db2_special_columns</methodname>
   <methodparam><type>resource</type><parameter>connection</parameter></methodparam>
   <methodparam><type>string</type><parameter>qualifier</parameter></methodparam>
   <methodparam><type>string</type><parameter>schema</parameter></methodparam>
   <methodparam><type>string</type><parameter>table_name</parameter></methodparam>
   <methodparam><type>int</type><parameter>scope</parameter></methodparam>
  </methodsynopsis>

  <para>
   Returns a result set listing the unique row identifier columns for a table.
  </para>

 </refsect1>
 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>connection</parameter></term>
     <listitem>
      <para>
       A valid connection to an IBM DB2, Cloudscape, or Apache Derby database.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>qualifier</parameter></term>
     <listitem>
      <para>
       A qualifier for DB2 databases running on OS/390 or z/OS servers. For
       other databases, pass &null; or an empty string.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>schema</parameter></term>
     <listitem>
      <para>
       The schema which contains the tables.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>table_name</parameter></term>
     <listitem>
      <para>
       The name of the table.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>scope</parameter></term>
     <listitem>
      <para>
       Integer value representing the minimum duration for which the
       unique row identifier is valid. This can be one of the following
       values:
       <informaltable>
        <tgroup cols="3">
         <thead>
          <row>
           <entry>Integer value</entry>
           <entry>SQL constant</entry>
           <entry>Description</entry>
          </row>
         </thead>
         <tbody>
          <row>
           <entry>0</entry>
           <entry>SQL_SCOPE_CURROW</entry>
           <entry>Row identifier is valid only while the cursor is positioned
           on the row.</entry>
          </row>
          <row>
           <entry>1</entry>
           <entry>SQL_SCOPE_TRANSACTION</entry>
           <entry>Row identifier is valid for the duration of the
            transaction.</entry>
          </row>
          <row>
           <entry>2</entry>
           <entry>SQL_SCOPE_SESSION</entry>
           <entry>Row identifier is valid for the duration of the
            connection.</entry>
          </row>
         </tbody>
        </tgroup>
       </informaltable>
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>
 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns a statement resource with a result set containing rows with unique
   row identifier information for a table. The rows are composed of the
   following columns:
   <informaltable>
    <tgroup cols="2">
     <thead>
      <row>
       <entry>Column name</entry>
       <entry>Description</entry>
      </row>
     </thead>
     <tbody>
      <row>
       <entry>SCOPE</entry>
       <entry>
        <para>
         <informaltable>
          <tgroup cols="3">
           <thead>
            <row>
             <entry>Integer value</entry>
             <entry>SQL constant</entry>
             <entry>Description</entry>
            </row>
           </thead>
           <tbody>
            <row>
             <entry>0</entry>
             <entry>SQL_SCOPE_CURROW</entry>
             <entry>Row identifier is valid only while the cursor is positioned
             on the row.</entry>
            </row>
            <row>
             <entry>1</entry>
             <entry>SQL_SCOPE_TRANSACTION</entry>
             <entry>Row identifier is valid for the duration of the
              transaction.</entry>
            </row>
            <row>
             <entry>2</entry>
             <entry>SQL_SCOPE_SESSION</entry>
             <entry>Row identifier is valid for the duration of the
              connection.</entry>
            </row>
           </tbody>
          </tgroup>
         </informaltable>
        </para>
       </entry>
      </row>
      <row>
       <entry>COLUMN_NAME</entry>
       <entry>Name of the unique column.</entry>
      </row>
      <row>
       <entry>DATA_TYPE</entry>
       <entry>SQL data type for the column.</entry>
      </row>
      <row>
       <entry>TYPE_NAME</entry>
       <entry>Character string representation of the SQL data type for the
       column.</entry>
      </row>
      <row>
       <entry>COLUMN_SIZE</entry>
       <entry>An integer value representing the size of the column.</entry>
      </row>
      <row>
       <entry>BUFFER_LENGTH</entry>
       <entry>
        Maximum number of bytes necessary to store data from this column.
       </entry>
      </row>
      <row>
       <entry>DECIMAL_DIGITS</entry>
       <entry>
        The scale of the column, or &null; where scale is not applicable.
       </entry>
      </row>
      <row>
       <entry>NUM_PREC_RADIX</entry>
       <entry>
        An integer value of either <literal>10</literal> (representing
        an exact numeric data type), <literal>2</literal> (representing an
        approximate numeric data type), or &null; (representing a data type for
        which radix is not applicable).
       </entry>
      </row>
      <row>
       <entry>PSEUDO_COLUMN</entry>
       <entry>Always returns 1.</entry>
      </row>
     </tbody>
    </tgroup>
   </informaltable>

  </para>
 </refsect1>

 <!-- Use when examples exist
 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title>A <function>db2_special_columns</function> example</title>
    <para>
     Any text that describes the purpose of the example, or
     what goes on in the example should go here (inside the
     <example> tag, not out
    </para>
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<![CDATA[
<?php
if ($anexample === true) {
    echo 'Use the PEAR Coding Standards';
}
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
Use the PEAR Coding Standards
]]>
    </screen>
   </example>
  </para>
 </refsect1>
 -->

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>db2_column_privileges</function></member>
    <member><function>db2_columns</function></member>
    <member><function>db2_foreign_keys</function></member>
    <member><function>db2_primary_keys</function></member>
    <member><function>db2_procedure_columns</function></member>
    <member><function>db2_procedures</function></member>
    <member><function>db2_statistics</function></member>
    <member><function>db2_table_privileges</function></member>
    <member><function>db2_tables</function></member>
   </simplelist>
  </para>
 </refsect1>

</refentry>

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