PHP: Retrieve image from MySQL using PDO

Question

I am refactoring some old code, including rewriting basic mysql queries to use PDO.

The following works brilliantly in all browsers and for all image types:

Answer 1

You can use this code to get image from database using PDO:

public function getImage($id){
    $sql = "SELECT * FROM images WHERE id = ?";
    $sth = $this->dbh->prepare($sql);

    $sth->bindParam(1,$id);
    $sth->execute();


    $num = $sth->rowCount();
    if( $num ){
        $row = $sth->fetch(PDO::FETCH_ASSOC);
        header("Content-type: ".$row['type']);
        print $row['image'];
        exit;
    }else{
        return null;
    }
}

type - data type(column name) such as image/png or image/gif
image - image data(column name) stored in table as LOB
$this->dbh connection handler
It works for me but now I need to find out how to use it with JS because result of this function is passed to JavaScript code - so called ajax