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<refentry xml:id="function.db2-columns" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>db2_columns</refname>
  <refpurpose>
   Returns a result set listing the columns and associated metadata for a table
  </refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>resource</type><methodname>db2_columns</methodname>
   <methodparam><type>resource</type><parameter>connection</parameter></methodparam>
   <methodparam choice="opt"><type class="union"><type>string</type><type>null</type></type><parameter>qualifier</parameter><initializer>&null;</initializer></methodparam>
   <methodparam choice="opt"><type class="union"><type>string</type><type>null</type></type><parameter>schema</parameter><initializer>&null;</initializer></methodparam>
   <methodparam choice="opt"><type class="union"><type>string</type><type>null</type></type><parameter>table_name</parameter><initializer>&null;</initializer></methodparam>
   <methodparam choice="opt"><type class="union"><type>string</type><type>null</type></type><parameter>column_name</parameter><initializer>&null;</initializer></methodparam>
  </methodsynopsis>

  <para>
   Returns a result set listing the columns and associated metadata 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. To match all schemas, pass
       <literal>'%'</literal>.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>table_name</parameter></term>
     <listitem>
      <para>
       The name of the table or view. To match all tables in the database,
       pass &null; or an empty string.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>column_name</parameter></term>
     <listitem>
      <para>
       The name of the column. To match all columns in the table, pass &null;
       or an empty string.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>
 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns a statement resource with a result set containing rows describing
   the columns matching the specified parameters. 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>TABLE_CAT</entry>
        <entry>Name of the catalog. The value is NULL if this table does not
         have catalogs.</entry>
       </row>
       <row>
        <entry>TABLE_SCHEM</entry>
        <entry>Name of the schema.</entry>
       </row>
       <row>
        <entry>TABLE_NAME</entry>
        <entry>Name of the table or view.</entry>
       </row>
       <row>
        <entry>COLUMN_NAME</entry>
        <entry>Name of the column.</entry>
       </row>
       <row>
        <entry>DATA_TYPE</entry>
        <entry>The SQL data type for the column represented as an integer value.</entry>
       </row>
       <row>
        <entry>TYPE_NAME</entry>
        <entry>A string representing the 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>NULLABLE</entry>
        <entry>An integer value representing whether the column is nullable or
        not.</entry>
       </row>
       <row>
        <entry>REMARKS</entry>
        <entry>Description of the column.</entry>
       </row>
       <row>
        <entry>COLUMN_DEF</entry>
        <entry>Default value for the column.</entry>
       </row>
       <row>
        <entry>SQL_DATA_TYPE</entry>
        <entry>An integer value representing the size of the column.</entry>
       </row>
       <row>
        <entry>SQL_DATETIME_SUB</entry>
        <entry>
         Returns an integer value representing a datetime subtype code,
         or &null; for SQL data types to which this does not apply.
        </entry>
       </row>
       <row>
        <entry>CHAR_OCTET_LENGTH</entry>
        <entry>
         Maximum length in octets for a character data type column, which
         matches COLUMN_SIZE for single-byte character set data, or &null; for
         non-character data types.
        </entry>
       </row>
       <row>
        <entry>ORDINAL_POSITION</entry>
        <entry>The 1-indexed position of the column in the table.</entry>
       </row>
       <row>
        <entry>IS_NULLABLE</entry>
        <entry>
         A string value where 'YES' means that the column is nullable and
         'NO' means that the column is not nullable.
       </entry>
       </row>
     </tbody>
    </tgroup>
   </informaltable>

  </para>
 </refsect1>

 <!-- Use when examples exist
 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title>A <function>db2_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';
}
?>
]]>
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    &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_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_special_columns</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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