PHP - Manual: mysqli_result::fetch_object

2024-11-15

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mysqli_result::fetch_object

mysqli_fetch_object

(PHP 5, PHP 7, PHP 8)

mysqli_result::fetch_object -- mysqli_fetch_object — Fetch the next row of a result set as an object

说明

面向对象风格

public mysqli_result::fetch_object(string $class = "stdClass", array $constructor_args = []): object|null|false

过程化风格

mysqli_fetch_object(mysqli_result $result, string $class = "stdClass", array $constructor_args = []): object|null|false

Fetches one row of data from the result set and returns it as an object, where each property represents the name of the result set's column. Each subsequent call to this function will return the next row within the result set, or null if there are no more rows.

If two or more columns of the result have the same name, the last column will take precedence and overwrite any previous data. To access multiple columns with the same name, mysqli_fetch_row() may be used to fetch the numerically indexed array, or aliases may be used in the SQL query select list to give columns different names.

注意: This function sets the properties of the object before calling the object constructor.

注意: 此函数返回的字段名大小写敏感。

注意: 此函数将 NULL 字段设置为 PHP null 值。

参数

result: 仅以过程化样式：由 mysqli_query()、mysqli_store_result()、 mysqli_use_result()、mysqli_stmt_get_result() 返回的 mysqli_result 对象。
class: The name of the class to instantiate, set the properties of and return. If not specified, a stdClass object is returned.
constructor_args: An optional array of parameters to pass to the constructor for class objects.

返回值

Returns an object representing the fetched row, where each property represents the name of the result set's column, null if there are no more rows in the result set, 或者在失败时返回 false.

更新日志

版本	说明
8.0.0	`constructor_args` now accepts `[]` for constructors with 0 parameters; previously an exception was thrown.

范例

示例 #1 mysqli_result::fetch_object() example

面向对象风格


<?php

mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$mysqli = new mysqli("localhost", "my_user", "my_password", "world");
 
$query = "SELECT Name, CountryCode FROM City ORDER BY ID DESC";

$result = $mysqli->query($query);

/* fetch object array */
while ($obj = $result->fetch_object()) {
    printf("%s (%s)\n", $obj->Name, $obj->CountryCode);
}

过程化风格


<?php

mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$link = mysqli_connect("localhost", "my_user", "my_password", "world");

$query = "SELECT Name, CountryCode FROM City ORDER BY ID DESC";

$result = mysqli_query($link, $query);

/* fetch associative array */
while ($obj = mysqli_fetch_object($result)) {
    printf("%s (%s)\n", $obj->Name, $obj->CountryCode);
}

以上例程的输出类似于：

Pueblo (USA)
Arvada (USA)
Cape Coral (USA)
Green Bay (USA)
Santa Clara (USA)

参见

mysqli_fetch_array() - Fetch the next row of a result set as an associative, a numeric array, or both
mysqli_fetch_assoc() - Fetch the next row of a result set as an associative array
mysqli_fetch_column() - Fetch a single column from the next row of a result set
mysqli_fetch_row() - Fetch the next row of a result set as an enumerated array
mysqli_query() - 对数据库执行一次查询
mysqli_data_seek() - Adjusts the result pointer to an arbitrary row in the result

add a note

User Contributed Notes 9 notes

down

object-array at gmail dot com ¶

6 years ago


Please mind the difference between objects and arrays in PHP>=5: arrays are by value while objects are by reference.

<?
$o = mysqli_fetch_object($res);
$o1 = $o;
$o1->value = 10;

$a = mysqli_fetch_array($res);
$a1 = $a;
$a1['value'] = 10;

echo $o->value; // 10
echo $a['value']; // (original value from db)
?>

Should same behaviour be intended, the object needs to be cloned:

<?
$o1 = clone $o;
?>

More about object cloning:
http://php.net/manual/en/language.oop5.cloning.php

down

Driek ¶

9 years ago


As indicated in the user comments of the mysql_fetch_object, it is important to realize that class fields get values assigned to them BEFORE the constructor is called.
For example;
<?php

class Employee
{
  private $id;

  public function __construct($id = 0)
  {
    $this->id = $id;
  }
}

// some code for creating a database connection... i.e. mysqli object
....
$result = $con->query("select id, name from employees");
$anEmployee = $result->fetch_object("Employee");
?>
will result in the ID being 0 because it is overridden by the constructor. Therefore, it is useful to check if the class field is already set.
I.e.
<?php
class Employee
{
  private $id;

  public function __construct($id = 0)
  {
    if (!$this->id)
    {
       $this->id = $id 
    }
  }
}
?>
Also note that the fields which will be assigned by fetch_object are case sensitive. If your table has the field "ID", it will result in the class field $ID being set. A simple work-around is to use aliases. I.e. "SELECT *, ID as id FROM myTable"
I hope this helps some people.

down

neo22s at gmail dot com ¶

6 years ago


Since 5.6.21 and PHP 7.0.6

mysqli_fetch_object() sets the properties of the object AFTER calling the object constructor. Not BEFORE as was in previous versions.

So behaviour has changed. Seems a bug but not sure if was done intentionally.

https://bugs.php.net/bug.php?id=72151

down

macole at paypal dot com ¶

5 years ago


Note that if you supply a class that has a __set() magic method defined in it, that method will be called for any properties that are not defined in your class.  For example:

<?php

class SomeClass {
    private $id;
    public $partner_name;
    public function __set( $name, $value ) {
        echo "__set was called!  Name = $name\n";
        $this->$name = $value;
    }
}

$db = new mysqli( 'localhost', 'Username', 'Password', 'DbName' );
$result = $db->query( 'SELECT id, partner_name, partner_type FROM submissions' );
$object = $result->fetch_object( 'SomeClass' );

?>

Produces the following output:

__set was called!  Name = partner_type

down

benpptung at tacol dot biz ¶

12 years ago


I don't know why no one talk about this.

fetch_object is very powerful since you can instantiate an Object which has the methods you wanna have.


You can try like this..


<?php

class PowerfulVO extends AbstractWhatEver {


    public $field1;

    private $field2; // note : private is ok


    public function method(){

       // method in this class

    }

}


     $sql = "SELECT * FROM table ..."

     $mysqli = new mysqli(........);

     $result = $mysqli->query($sql);

     $vo = $result->fetch_object('PowerfulVO');

?>



Note : if the field is not defined in the class, fetch_object will add this field for you as public.


The method is very powerful, especially if you want to use a VO design pattern or class mapping feature with Flex Remoting Object( Of course, you need to have ZendAMF or AMFPHP ..framework)


Hope this help and open new possibilities for you

down

fedge-no at hotmail dot calm ¶

5 years ago


I checked the bug database and as long as your PHP installation is up to date, the order of setting properties and calling the constructor should now follow the order specified in the documentation. There was a little while that a patch had been introduced where it was happening the other way around but that has been fixed now.

down

-4

peterbelm at g[oogle]mail dot com ¶

13 years ago


If your SQL code selects columns with empty names like so:

SELECT id as ``...

You will get a fatal error "Cannot access empty property", this took me a while to track down!

Obviously your SQL really shouldn't do that, and should be fixed but I'm going to submit a feature request to ask for a better error message for that.

down

-1

Alex ¶

10 years ago


Make sure to specify the full namespace for the "string $class_name" parameter and not a partial one, as it won't find it. For example:

<?php

namespace Root(backslash)FirstLevel
{
    public static function Test($result)
    {
        return mysqli_fetch_object($result, 'SecondLevel\\MyClass');
    }
}

?>

... will not work but this will:

<?php

namespace Root(backslash)FirstLevel
{
    public static function Test($result)
    {
        return mysqli_fetch_object($result, 'Root\\FirstLevel\\SecondLevel\\MyClass');
    }
}

?>

down

-5

me at philkershaw dot me ¶

8 years ago


As a best practice, if you intend to use a defined class when using fetching_object(). Put the data obtaining code within a static method of the defined class. Otherwise, wherever you include the file (if not using an autoloader) the data connection will occur whether you want it to or not.

For example:

<?php

class User
{
    public $name;

    public static function getUser($id)
    {
        $conn = new mysqli('localhost', 'username', 'password', 'database');
        if ($result = $conn->query("SELECT * FROM users WHERE id = {$id} LIMIT 1")) {
            return $result->fetch_object('User');
            $result->close();
        }
    }
}
?>

Call the static method to obtain an instance of the User class with your data applied to it.

<?php
$user = User::getUser('31'); 
echo $user->name; // echo's 'Phil'
?>

add a note

官方地址：https://www.php.net/manual/en/mysqli-result.fetch-object.php

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mysqli_result::fetch_object

mysqli_fetch_object

说明

参数

返回值

更新日志

范例

参见

User Contributed Notes 9 notes