MYSQLi获取对象问题

Question

为什么我收到错误：

  

致命错误：调用未定义的方法mysqli :: fetch_object（）

继承我的代码：

$mysqli = new mysqli($db_data_hostname, $db_data_username, $db_data_password, $db_data_dbname);
    $query = "SELECT attName, attType, attOptions FROM form_constructor WHERE  device_name='$deviceType';";

    $result = $mysqli->query($query);

    while($row = $mysqli->fetch_object($result)){

        echo $row->attName;
        echo $row->attType;         
        echo $row->attOptions;

    }

Answer 1

为什么会收到错误？

您需要使用已分配$result的变量$mysqli->query。 Read about MySQLi Object approach on the manual

您的代码已修复。

$mysqli = new mysqli($db_data_hostname, $db_data_username, $db_data_password, $db_data_dbname);
    $query = "SELECT attName, attType, attOptions FROM form_constructor WHERE  device_name='$deviceType';";

    $result = $mysqli->query($query);

    while($row = $result->fetch_object()){

        echo $row->attName;
        echo $row->attType;         
        echo $row->attOptions;

    }

Answer 2

你应该在$ result的stmt结果上调用fetch_object。 所以你的while循环看起来像：

while($row = $result->fetch_object()) {

Answer 3

你必须使用mysqli结果：

while($row = $result->fetch_object()){

        echo $row->attName;
        echo $row->attType;         
        echo $row->attOptions;

    }