问何时关闭预准备语句

EN

    $query = "insert into web_reviews (title,added_date,reviewer_home_url,read_more_link,summary) values(?,?,?,?,?)";
    $stmt = $this->db->prepare($query);
    $stmt->bind_params($this->title,$this->added_date,$this->reviewer_home_url,$this->read_more,$this->summary);
    $stmt->execute() or die("Cannot add the date to the database, please try again.");
    $stmt->close();

    $stmt = $this->db->prepare("select id from web_reviews where title = ? and read_more = ?");
    $stmt->bind_params($this->title,$this->read_more);
    $stmt->execute();
    $stmt->bind_results($web_review_id);
    $stmt->close();