<p></p>
<p>README should tell that:</p>
<ul>
<li>1 is returned when query succeeds and result set is not empty</li>
<li>2 is returned when query succeeds but result set is not empty</li>
<li>3 is returned when result set is not empty, but result param was not given</li>
<li>-1 is returned in case of error</li>
</ul>

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