<para>
            Points to the data.  The format of the data is described
            in <xref linkend="ecpg-variables-type-mapping"/>.
           </para>
          </listitem>
         </varlistentry>

         <varlistentry id="ecpg-sqlda-sqlvar-sqlind">
         <term><literal>sqlind</literal></term>
          <listitem>
           <para>
            Points to the null indicator.  0 means not null, -1 means
            null.
           </para>
          </listitem>
         </varlistentry>

         <varlistentry id="ecpg-sqlda-sqlvar-sqlname">
         <term><literal>sqlname</literal></term>
          <listitem>
           <para>
            The name of the field.
           </para>
          </listitem>
         </varlistentry>
        </variablelist>
     </para>
    </sect4>

    <sect4 id="ecpg-sqlda-sqlname">
     <title>struct sqlname Structure</title>

     <para>
      A <type>struct sqlname</type> structure holds a column name.  It
      is used as a member of the <type>sqlvar_t</type> structure.  The
      definition of the structure is:
<programlisting>
#define NAMEDATALEN 64

struct sqlname
{
        short           length;
        char            data[NAMEDATALEN];
};
</programlisting>
      The meaning of the fields is:
            <variablelist>
             <varlistentry id="ecpg-sqlda-sqlname-length">
              <term><literal>length</literal></term>
               <listitem>
                <para>
                 Contains the length of the field name.
                </para>
               </listitem>
              </varlistentry>
             <varlistentry id="ecpg-sqlda-sqlname-data">
              <term><literal>data</literal></term>
               <listitem>
                <para>
                 Contains the actual field name.
                </para>
               </listitem>
              </varlistentry>
            </variablelist>
     </para>
    </sect4>
   </sect3>

   <sect3 id="ecpg-sqlda-output">
    <title>Retrieving a Result Set Using an SQLDA</title>

    <procedure>
     <para>
      The general steps to retrieve a query result set through an
      SQLDA are:
     </para>
     <step><simpara>Declare an <type>sqlda_t</type> structure to receive the result set.</simpara></step>
     <step><simpara>Execute <command>FETCH</command>/<command>EXECUTE</command>/<command>DESCRIBE</command> commands to process a query specifying the declared SQLDA.</simpara></step>
     <step><simpara>Check the number of records in the result set by looking at <structfield>sqln</structfield>, a member of the <type>sqlda_t</type> structure.</simpara></step>
     <step><simpara>Get the values of each column from <literal>sqlvar[0]</literal>, <literal>sqlvar[1]</literal>, etc., members of the <type>sqlda_t</type> structure.</simpara></step>
     <step><simpara>Go to next row (<type>sqlda_t</type> structure) by following the <structfield>desc_next</structfield> pointer, a member of the <type>sqlda_t</type> structure.</simpara></step>
     <step><simpara>Repeat above as you need.</simpara></step>
    </procedure>

    <para>
     Here is an example retrieving a result set through an SQLDA.
    </para>

    <para>
     First, declare a <type>sqlda_t</type> structure to receive the result set.
<programlisting>
sqlda_t *sqlda1;
</programlisting>
    </para>

    <para>
     Next, specify the SQLDA in a command.  This is
     a <command>FETCH</command> command example.
<programlisting>
EXEC SQL FETCH NEXT FROM cur1 INTO DESCRIPTOR sqlda1;
</programlisting>
    </para>

    <para>
     Run a loop following the linked list to retrieve the rows.
<programlisting>
sqlda_t *cur_sqlda;

for (cur_sqlda = sqlda1;
     cur_sqlda != NULL;
     cur_sqlda = cur_sqlda->desc_next)
{
    ...
}
</programlisting>
    </para>

    <para>
     Inside the loop, run another loop to retrieve each column data
     (<type>sqlvar_t</type> structure) of the row.
<programlisting>
for (i = 0; i &lt; cur_sqlda->sqld; i++)
{
    sqlvar_t v