class：mysqli_fetch_object

Question

我按照php.net的doc来从fetch_object，

获取某些对象的结果

$mysqli = new mysqli("localhost", "root", "tklau", "xx_2011");

/* check connection */
if (mysqli_connect_errno()) {
    printf("Connect failed: %s\n", mysqli_connect_error());
    exit();
}

$query = "
    SELECT cnt_id, cnt_email1
    FROM root_contacts_cfm
    ORDER BY cnt_id DESC
    ";

if ($result = $mysqli->query($query)) {

    /* fetch object array */
    while ($obj = $result->fetch_object()) {
        print_r($obj);
        //echo $obj->cnt_email1;
    }

    /* free result set */
    $result->close();
}

/* close connection */
$mysqli->close();

我会得到这个，

stdClass Object
(
    [cnt_id] => 2
    [cnt_email1] => rocco@xx.net
)
stdClass Object
(
    [cnt_id] => 1
    [cnt_email1] => lola@xx.co.uk
)

但我想把这段代码变成一个类，

#connects the database and handling the result
class __database {

    protected $connection = null;
    protected $error = null;

    #make a connection
    public function __construct($hostname,$username,$password,$database)
    {
        $this -> connection = new mysqli($hostname,$username,$password,$database);

        if (mysqli_connect_errno()) 
        {
            printf("Connect failed: %s\n", mysqli_connect_error());
            exit();
        }
    }

    public function fetch_object($query) 
    {
        $result = $this -> connection -> query($query);
        if($result) 
        {
            while ($row = $result->fetch_object()) {
                return $row;
            }
        } 
        else
        {
            $this -> error = $this -> connection -> error;
            return false;
        }
    }


    #display error
    public function get_error() 
    {
        return $this -> error;
    }

    #closes the database connection when object is destroyed.
    public function __destruct()
    {
        $this -> connection -> close();
    }
}

所以，我会像这样调用类函数，

$sql = "
    SELECT cnt_id, cnt_email1
    FROM root_contacts_cfm
    ORDER BY cnt_id DESC
    ";

$items = $connection -> fetch_object($sql);
print_r($items);

但是我从结果中只得到一行不正确，

stdClass Object
(
    [cnt_id] => 2
    [cnt_email1] => lau@xx.net
)

我{class 1}}的班级功能一定是错的 - 我该如何解决？请指教......

Answer 1

当您找到第一个结果时，您的功能正在返回     return $row; 您应该将每一行存储在一个数组中，然后返回该数组。

if($result){
   $function_result = array();
   $i = 0;
   while($row = $result->fetch_object()){
      $function_result[$i] = $row;
      $i++;
   }
  return $function_result;
}