exec(interval_seconds DOUBLE, execute_queries TEXT CHARSET utf8, stop_condition TEXT CHARSET utf8)</pre></blockquote>
</p>
<p>
  Input:
  <ul>
    <li><strong>interval_seconds</strong>: number of seconds to sleep between invocation of queries.
    	<br/>This value can be a floating point number, e.g. <strong>0.1</strong> indicates one-tenth of a second.
    	<br/><i>repeat_exec()</i> begins with query execution, then follows on to sleeping. Once the 
    	<strong>stop_condition</strong> is met, no more slee