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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.5 $ -->
<!-- Generated by xml_proto.php v2.2. Found in /scripts directory of phpdoc. -->
<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>
<programlisting role="php">
<![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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