①mysqli_fetch_row将数据解析成索引数组；
while($data = mysqli_fetch_row($res)){
print_r($data);
}
②mysqli_fetch_assoc将数据解析成关联数组
while($data = mysqli_fetch_assoc($res)){
print_r($data);
}
③mysql_fetch_array将数据解析成组合数组
while($data = mysqli_fetch_array($res)){
print_r($data);
}
④mysqli_fetch_object将数据解析成对象；
while($data = mysqli_fetch_object($res)){
print_r($data);
echo $data -> name;
echo "<br>";
}
}
8.关闭数据库：mysqli_close($link);
