<?php
$conexion = mysql_connect("localhost","root","admusr520");
mysql_select_db("Adcont_prueba", $conexion);
if ($_POST) {
$sql = "select * from Test where Texto ='".$_POST['codigo']."'";
$sql = mysql_query($sql);
if (mysql_num_rows($sql)>0){
print "<script>alert('Codigo encontrado')</script>";
}
else {
print "<script>alert('Codigo NO encontrado')</script>";
}
}
?>
<html>
<form action="Test.php" method="POST">
<table>
<tr>
<td>
Codigo:<input type="text" name="codigo"/>
</td>
</tr>
<tr>
<td>
<input type="submit" name="consultar" value="consultar"/>
</td>
</tr>
</table>
</form>
</html>
quizas esto puefda sevir
saludos!