How to get the data from database

I’ve tried to call the data from the database and I’ve used Node-red to be the connection between my flutter project and database. However, there is no connection between my project and database. :sob: This’s my code.

class Products {
  int product_id;
  String real_id;
  String product_name;
  String detail;
  double price;
  String picture;

  Products(
      {this.product_id,this.real_id, this.product_name, this.picture, this.price, this.detail});

  Products.fromJson(Map<String, dynamic>json){
    product_id=json['product_id'];
    real_id=json['real_id'];
    product_name=json['product_name'];
    detail=json['detail'];
    price=json['price'];
    picture=json['picture'];
  }

  Map<String, dynamic> toJson(){
    final Map<String, dynamic> data = new Map<String, dynamic>();
    data['product_id'] =this.product_id;
    data['real_id'] = this.real_id;
    data['product_name']=this.product_name;
    data['detail'] = this.detail;
    data['price']=this.price;
    data['picture']=this.picture;
    return data;
  }
}

Future<Products> getProductInfo(String product_id, String real_id,String product_name,String detail,double price,String picture) async{
  String url="http://IP address/getProductInfo";
  var result = await http.post(url,body:
  {"product_id":product_id,
    "real_id":real_id,
    "product_name":product_name,
    "detail":detail,
    "price":price,
    "picture":picture
  });
  if(result.statusCode==200){
    print(result.body);
    var json_object = json.decode(result.body);
    return Products.fromJson(json_object);
  }
}

and the code below is the code I’ve used to display the data.

 class ProductDetailInfo extends StatelessWidget {
  List<Products> p_detail;
  ProductDetailInfo({this.p_detail});
  @override
  Widget build(BuildContext context) {
    return ListView.builder(
        itemCount: p_detail.length,
        itemBuilder: (BuildContext context, int index){
          return Container(
            child: Text(p_detail[index].product_name,
                style: TextStyle(
                    fontWeight: FontWeight.bold,
                    fontFamily: 'Baloo2',
                    fontSize: 25,
                    color: Colors.white)),
          );
        }
    );
  }
}