php - 将 mysql_query 转换为 PDO

Question

我正在尝试将所有查询重写为 PDO 格式。 目前我正在尝试重写这个函数，但我似乎无法让它工作。

mysql_query 函数

    function checkLogin() {

    $this->sQuery = "SELECT * FROM users 
          WHERE gebruikersnaam='" . mysql_real_escape_string($_POST['gebruikersnaam']) . "'
          AND wachtwoord = '" . sha1($_POST['wachtwoord']) . "'";


    $this->rResult = mysql_query($this->sQuery)
            or die("Er is iets misgegaan " . mysql_error());


    if (mysql_num_rows($this->rResult) == 1) {  // login name was found            
        $this->aRow = mysql_fetch_assoc($this->rResult);
        $_SESSION['gebruiker'] = $this->aRow['voornaam'];

        header("location: dashboard.php");
    }
}

这就是我使用 PDO 取得的进展:

       function checkLoginPDO(){
    $connect = new PDO(host, username, password); // Database Connectie maken (De host, username & password zijn in de config.php aan te passen)
    $sql = "SELECT * FROM users 
          WHERE gebruikersnaam='" . mysql_real_escape_string($_POST['gebruikersnaam']) . "'
          AND wachtwoord = '" . sha1($_POST['wachtwoord']) . "'"; 
    $value = $connect->prepare($sql); //Een variabele aanmaken die de PDO vast houdt. Vervolgens word de code voorbereid door de prepare functie
    $value->execute(); 
    if(mysql_num_rows($value->fetch()) == 1){
        $_SESSION['gebruiker'] = $row['voornaam'];
        header("location: dashboard.php");
    }
}

我做错了什么/忘记了什么？

提前致谢!

Answer 1

应该是这样的:

function checkLoginPDO(){
    $connect = new PDO(host, username, password); // Database Connectie maken (De host, username & password zijn in de config.php aan te passen)
    // define sql query string with special placeholders in the form of ?
    $sql = "SELECT * FROM users 
      WHERE gebruikersnaam=?
      AND wachtwoord =?";
    // prepare statement based on sql query string
    $statement = $connect->prepare($sql);
    // bind first question mark with value from $_POST, first question mark will be replaced with that value
    $statement->bindParam(1, $_POST['gebruikersnaam']);
    // do the same for second question mark
    $statement->bindParam(2, sha1($_POST['wachtwoord']));
    // execute this prepared statement with binded values
    $statement->execute();
    // fetch row from the result in the form of associated array
    if(($row = $statement->fetch(PDO::FETCH_ASSOC))){
        $_SESSION['gebruiker'] = $row['voornaam'];
        header("location: dashboard.php");
    }
    // free statement memory
    $statement = null;
}

注意:代码未经测试。

编辑，添加说明: 使用 PDO 时，您应该使用它处理查询和数据库的方式。使用任何 mysql_* 函数都不是执行此操作的最佳方式。