mysqli_result::fetch_object

mysqli_fetch_object

(PHP 5, PHP 7, PHP 8)

mysqli_result::fetch_object -- mysqli_fetch_objectRecebe a próxima linha de um resultado como um objeto

Descrição

Estilo orientado a objetos

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

Estilo procedural

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

Recebe uma linha de dados do resultado e retorna-a como um objeto, onde cada propriedade representa o nome da coluna do resultado. Cada chamada subsequente a esta função retornará a linha seguinte dentro do conjunto de resultados, ou null se não houver mais linhas.

Se duas ou mais colunas do resultado tiverem o mesmo nome, a última coluna terá precedência e irá sobrescrever os dados anteriores. Para acessar múltiplas colunas com o mesmo nome, mysqli_fetch_row() pode ser usada para receber o array indexado numericamente, ou apelidos podem ser usados na lista de seleção da consulta SQL para dar nomes diferentes às colunas.

Nota: Esta função define as propriedades do objeto antes de chamar o construtor do objeto.

Nota: Os nomes de campos retornados por esta função diferenciam maiúsculas e minúsculas.

Nota: Esta função define campos NULL como o valor null do PHP.

Parâmetros

result

Somente no estilo procedural: Um objeto mysqli_result retornado por mysqli_query(), mysqli_store_result(), mysqli_use_result() ou mysqli_stmt_get_result().

class

O nome da classe a instanciar, definir propriedades e retornar. Se não especificada, um objeto stdClass é retornado.

constructor_args

Um array opcional de parâmetros para passar ao construtor de objetos da classe definida em class.

Valor Retornado

Retorna um objeto que representa a linha recebida, onde cada propriedade representa o nome da coluna do resultado, null se não houver mais colunas no resultado, ou false em caso de falha.

Erros/Exceções

Um exceção ValueError é lançada quando o parâmetro constructor_args é não vazio com a classe não possuindo construtor.

Registro de Alterações

Versão Descrição
8.3.0 Agora lança uma exceção ValueError quando o parâmetro constructor_args é não vazio com a classe não possuindo construtor; anteriormente uma Exception era lançada.
8.0.0 constructor_args agora aceita [] para construtores sem parâmetros; anteriormente, uma exceção era lançada.

Exemplos

Exemplo #1 Exemplo de mysqli_result::fetch_object()

Estilo orientado a objetos

<?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);

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

Estilo procedural

<?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);

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

Os exemplos acima produzirão algo semelhante a:

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

Veja Também

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User Contributed Notes 9 notes

up
16
object-array at gmail dot com
8 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
up
19
Driek
11 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.
up
13
neo22s at gmail dot com
7 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
up
5
macole at paypal dot com
7 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
up
8
benpptung at tacol dot biz
14 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
up
1
fedge-no at hotmail dot calm
7 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.
up
-1
Alex
12 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');
    }
}

?>
up
-5
me at philkershaw dot me
9 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'
?>
up
-6
peterbelm at g[oogle]mail dot com
15 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.
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