王兆盟homework6

本次作业要求用PDO模板实现IMode中的四个方法，并且用参数绑定的方法防止sql注入。

";
    $dbh = null;
}
catch (PDOException $e)
{
    die ("错误: " . $e->getMessage() . "
");
}
interface iModel
{


    public function select(string $statements,array $params = []);

    public function update(string $statement);

    public function delete(string $statement);

    public function insert(string $statement);
}
class PDOmodeL implements IModel
{
    protected $dbh;
    public function __construct($dsn, $user, $pass)
    {
        $this->dbh = new PDO($dsn, $user, $pass);
    }
    public function select(string $statements,array $params = [])
    {
        $result = $this->dbh->prepare($statements);
        if($params){
            foreach($params as $i=>$v){
                $result->bindParam($i,$v);
            }
            $res = $result->fetch(PDO::FETCH_ASSOC);
            var_dump($res);
        }
        $count= $result->execute();
        return $count;
    }
    public function update(string $statements,array $params = [])
    {
        $result = $this->dbh->prepare($statements);
        if($params){
            foreach($params as $i=>$v){
                $result->bindParam($i,$v);
            }
        }
        $count= $result->execute();
        return $count;
    }
    public function delete(string $statements,array $params = [])
    {
        $result = $this->dbh->prepare($statements);
        if($params){
            foreach($params as $i=>$v){
                $result->bindParam($i,$v);
            }
        }
        $count= $result->execute();
        return $count;
    }
    public function insert(string $statements,array $params = [])
    {
        $result = $this->dbh->prepare($statements);
        if($params){
            foreach($params as $i=>$v){
                $result->bindParam($i,$v);
            }
        }
        $count= $result->execute();
        return $count;
    }
}
?>