mplementing it to receive values for parameter markers in their SQL statements.
 </p>

 <p>
 This interface is implemented by both &lt;sql:query&gt; and &lt;sql:update&gt;. Its <code>addSQLParameter()</code>
 method is called by nested parameter actions (such as &lt;sql:param&gt;) to substitute <code>PreparedStatement</code>
 parameter values for "?" parameter markers in the SQL statement of the enclosing <code>SQLExecutionTag</code> action.
 </p>

 <p>
 The given parameter values are converted to their cor