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? ??? ??? MySQL ???? ? ?? ???? ?? MySQL ???? MySQL ? MSSQL? PDO? ???????? ??? ??????

? ?? ???? ?? MySQL ???? MySQL ? MSSQL? PDO? ???????? ??? ??????

Jan 10, 2025 am 09:33 AM

How to Migrate from Deprecated MySQL Functions to PDO for MySQL and MSSQL?

MySQL ??? MySQL ? MSSQL? PDO? ??

MySQL ?? ?? ?? ? ??

MySQL ?? ??? ? ?? ???? ??? ?? ????? ??? ?????. ???? MySQLi ?? PDO_MySQL ??? ???? ?? ????. MySQLi ? PDO? MySQL ??? ?? ??? ?? ? ??? ?????.

PDO ??

PDO(PHP Data Objects)? ??????? ????? ?? ?? ?? API???. PDO? ???? ??????? ????? PDO ???? ???? ? PDO ????? ????.

MySQL? ??

$dsn = 'mysql:dbname=databasename;host=127.0.0.1';
$user = 'dbuser';
$password = 'dbpass';

$dbh = new PDO($dsn, $user, $password);

MSSQL? ??

$dsn = 'sqlsrv:Server=127.0.0.1;Database=databasename';
$user = 'dbuser';
$password = 'dbpass';

$dbh = new PDO($dsn, $user, $password);

PDO? ???? ?? ??

PDO? ??? ?? ???? SQL ?? ???? ?????. ??? ?? ??? ???? ?? ??? ????? ???? ?? ???? ???? SQL ??? ?????. 

$SQL = 'SELECT ID, EMAIL FROM users WHERE user = :username';
$preparedStatement = $dbh->prepare($SQL);

??? ??

bindParam ?? bindValue? ???? ??? ?? ?? ??????. 

$preparedStatement->bindParam(':username', $username);

?? ??

??? ???? ??? ???? ?????. 

$preparedStatement->execute();

?? ??

PDO? ??? ??? ???? ?? fetch ? fetchAll? ?? ???? ?????. 

while ($row = $preparedStatement->fetch()) {
    echo $row['ID'];
    echo $row['EMAIL'];
}

PDO ?? ??? ??

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

class Database {

    protected $connection;

    public function __construct($dsn, $user, $password) {
        $this->connection = new PDO($dsn, $user, $password);
    }

    public function query($SQL) {
        return $this->connection->query($SQL);
    }

    public function prepare($SQL, $params = []) {
        $preparedStatement = $this->connection->prepare($SQL);
        $preparedStatement->execute($params);
        return $preparedStatement;
    }

}

// 使用方法：
$db = new Database($dsn, $user, $password);

$SQL = 'SELECT ID, EMAIL FROM users WHERE user = :username';
$result = $db->prepare($SQL, ['username' => $username]);

while ($row = $result->fetch()) {
    echo $row['ID'];
    echo $row['EMAIL'];
}

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