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?? ????? PDO ??? ???? ??
???? ?? ??
?? ??
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? ??? ?? PHP ???? PHP? ?? ????? PDO ??? ???? ???? ??? ??????

PHP? ?? ????? PDO ??? ???? ???? ??? ??????

Dec 21, 2024 am 12:50 AM

How to Properly Use a PDO Connection Across Multiple Classes in PHP?

?? ????? PDO ??? ???? ??

???? ?? ??

"??? ?? ??: ???? ?? ??? ?????? ??"??? ?? ??? ::prepare()"? ??? ????? PDO ??? ????? ??? ? ??? ? ????. ? ??? ?? ?? ?????(OOP)? ??? ?? ???? ??? ?? ???? ?????.

?? ??

1. ?????? ???? ?? ??????:
?? ?????? ???? ?? ?? ??? ???? ????. ?? PDO? ??? ???? ?? ?? ???? ??? ? ?????.

2. ?? ?????? ?? ??:
PDO ?? ??? ?????? ???? ???? ??? $db ??? ????????. ? ?? ??? ?? ?? ?????? ??? ??? ? ????.

3. ??? ??? ????? ??:
?????? ???? ??? ?? ???? $db ??? ??? ??? ??? ???. ? ?? ??? ?? ???????? ??????? ?? ??? ???? ?????.

???? ?

?? ?? ??? ?????. ?????:

database.php:

$host = '127.0.0.1';
$db   = 'test';
$user = 'root';
$pass = '';
$charset = 'utf8';

$dsn = "mysql:host=$host;dbname=$db;charset=$charset";
$opt = [
    \PDO::ATTR_ERRMODE            => \PDO::ERRMODE_EXCEPTION,
    \PDO::ATTR_DEFAULT_FETCH_MODE => \PDO::FETCH_ASSOC,
    \PDO::ATTR_EMULATE_PREPARES   => false,
];
$pdo = new \PDO($dsn, $user, $pass, $opt);

u ser.php:

class User {
    /* Properties */
    private $conn;

    /* Get database access */
    public function __construct(\PDO $pdo) {
        $this->conn = $pdo;
    }

    /* List all users */
    public function getUsers() {
        return $this->conn->query("SELECT username, usermail FROM user")->fetchAll();
    }
}

app.php:

include 'database.php';
$user = new User($pdo);
$list = $user->getUsers();

foreach($list as $test) {
    echo $test["username"],"\n";
}

?? ??? ?????? ?? ????? PDO ??? ??? ???? ???? ?? ?? ??? ??? ?? ??? ?????.

? ??? PHP? ?? ????? PDO ??? ???? ???? ??? ??????? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!

? ????? ??
? ?? ??? ????? ???? ??? ??????, ???? ?????? ????. ? ???? ?? ???? ?? ??? ?? ????. ???? ??? ???? ???? ??? ?? admin@php.cn?? ?????.

? AI ??

Undresser.AI Undress

Undresser.AI Undress

???? ?? ??? ??? ?? AI ?? ?

AI Clothes Remover

AI Clothes Remover

???? ?? ???? ??? AI ?????.

Video Face Swap

Video Face Swap

??? ??? AI ?? ?? ??? ???? ?? ???? ??? ?? ????!

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???++7.3.1

???? ?? ?? ?? ???

SublimeText3 ??? ??

SublimeText3 ??? ??

??? ??, ???? ?? ????.

???? 13.0.1 ???

???? 13.0.1 ???

??? PHP ?? ?? ??

???? CS6

???? CS6

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SublimeText3 Mac ??

SublimeText3 Mac ??

? ??? ?? ?? ?????(SublimeText3)

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