connect("localhost","root","root","nfyx"); $sql="select name from test where id>0"; $res=$mysqli->query($sql); foreach ($res as $row) { echo $row['name']."\n"; } $mysqli->close(); $mysqli= new \Phpclass\Databases\PDOS(); $mysqli->connect("localhost","root","root","nfyx"); $sql="select name from test where id>0"; foreach ($mysqli->query($sql,PDO::FETCH_ASSOC) as $row) { print_r($row); } $mysqli->close(); -------------------------------------------------------------------Index2.php

    connect_errno) { die("连接数据库失败".self::$conn->connect_error); } } function query($sql) { return self::$conn->query($sql); } function close() { self::$conn=null; } }

-------------------------------------------------------------------Mysqlis.php

    getMessage(); } } function query($sql) { return self::$conn->query($sql); } function close() { self::$conn=null; } }

-------------------------------------------------------------------PDOS.php