Flutter getting error while inserting values in sqllite - flutter

Question

I am trying to insert my data in sqllite
Here is my code
class Cart {
int id;
String title;
String image;
String price;
String color;
String sizeselect;
Cart({
this.id,
this.title,
this.image,
this.price,
this.color,
this.sizeselect,
});
factory Cart.fromJson(Map<String, dynamic> data) => new Cart(
id: data["id"],
title: data["title"],
image: data["image"],
price: data["price"],
color: data["color"],
sizeselect: data["sizeselect"],
);
Map<String, dynamic> toJson() => {
"id": id,
"title": title,
"image": image,
"price": price,
"color": color,
"sizeselect": sizeselect,
};
}
class DatabaseHelper {
static final _databaseName = "MyDatabase.db";
static final _databaseVersion = 1;
static final table = 'my_table';
// make this a singleton class
DatabaseHelper._privateConstructor();
static final DatabaseHelper instance = DatabaseHelper._privateConstructor();
// only have a single app-wide reference to the database
static Database _database;
Future<Database> get database async {
if (_database != null) return _database;
// lazily instantiate the db the first time it is accessed
_database = await _initDatabase();
return _database;
}
// this opens the database (and creates it if it doesn't exist)
_initDatabase() async {
Directory documentsDirectory = await getApplicationDocumentsDirectory();
String path = join(documentsDirectory.path, _databaseName);
return await openDatabase(path,
version: _databaseVersion,
onCreate: _onCreate);
}
// SQL code to create the database table
Future _onCreate(Database db, int version) async {
await db.execute("CREATE TABLE $table ("
"id INTEGER PRIMARY KEY,"
"title TEXT,"
"image TEXT,"
"color TEXT,"
"price TEXT,"
"sizeselect TEXT"
")");
}
Future<int> insert(cart) async {
print(cart.id);
Database db = await instance.database;
return await db.insert(table, cart);
}
}
I am trying to pass like this
onPressed: () async {
var cart = Cart();
cart.id = widget.product.id;
cart.title = widget.product.title;
cart.image = widget.product.image;
cart.price = widget.product.normalPrice;
cart.color = selectedColor;
cart.sizeselect = selectedSize;
print(cart);
final dbHelper = DatabaseHelper.instance;
final id = await dbHelper.insert(cart);
// Model.createCustomer(map);
}
Its showing this error while passing data type 'Cart' is not a subtype of type 'Map<String, dynamic>'
Can any one please tell i need to convert it to something or what ? I think i need to change the json to String or something ? i just need to insert data in database but on this error i am stuck :/

Answer 1

Edit the line
return await db.insert(table, cart);
With
return await db.insert(table, cart.toJson());

Answer 2

You need to import below third parties
import 'package:path_provider/path_provider.dart';
// path_provider: ^1.6.0
import 'package:sqflite/sqflite.dart';
// sqflite: ^1.3.0
This is DatabaseHelper Class
const String databaseName = "cart.db";
const int databaseVersion = 1;
// ------ CART Table Columns ---------- //
mixin CartTable {
static final String colTitle = "title";
static final String colImage = "image";
static final String colPrice = "price";
static final String colColor = "color";
static final String colSizeSelect = "sizeselect";
}
class DatabaseHelper {
static Database database;
//singleton instance
static DatabaseHelper sharedInstance = new DatabaseHelper._internal();
factory DatabaseHelper() {
return sharedInstance;
}
DatabaseHelper._internal();
Future<Database> get instance async {
if (database != null) {
return database;
}
database = await initDatabase();
return database;
}
initDatabase() async {
io.Directory documentDirectory = await getApplicationDocumentsDirectory();
String path = join(documentDirectory.path, databaseName);
var db = await openDatabase(path,
version: databaseVersion, onCreate: _onCreateTables);
return db;
}
_onCreateTables(Database db, int version) async {
await createCartTable(db);
}
Future createCartTable(Database db) async {
await db.execute(
"CREATE TABLE ${CartTable.tbCartDetails} ( ${CartTable.colID} INTEGER PRIMARY KEY AUTOINCREMENT, ${CartTable.colTitle} TEXT NOT NULL,"
" ${CartTable.colImage} TEXT NOT NULL, ${CartTable.colPrice} TEXT NOT NULL, ${CartTable.colColor} TEXT NOT NULL,"
" ${CartTable.colSizeSelect} TEXT NOT NULL )");
}
/// Insert Record
Future<dynamic> insertRecord(dynamic data, String tableName) async {
var dbClient = await instance;
return await dbClient.insert(tableName, data.toJson(),
conflictAlgorithm: ConflictAlgorithm.replace);
}
/// Get records
Future<List<dynamic>> getRecords(String table,
{List<String> columns,
String where,
List<dynamic> args,
String groupBy,
String orderBy,
int limit,
int offset}) async {
var dbClient = await instance;
return await dbClient.query(table,
columns: columns,
where: where,
whereArgs: args,
groupBy: groupBy,
orderBy: orderBy,
limit: limit,
offset: offset);
}
/// Update records
Future<dynamic> updateRecord(
{#required String table,
#required List<String> whereColumns,
#required List<dynamic> valuesCondition,
#required Map updateData}) async {
var dbClient = await instance;
String where = '';
whereColumns.forEach((column) => where += " $column=? and");
where = where.substring(0, where.length - 3);
debugPrint(
"Update => $table -> where :$where values:$valuesCondition Data:$updateData");
return await dbClient.update(table, updateData,
where: where, whereArgs: valuesCondition);
}
/// Delete records
Future<dynamic> deleteRecord(
{#required String table,
List<String> whereColumns,
List<dynamic> valuesCondition}) async {
var dbClient = await instance;
String where = '';
whereColumns.forEach((column) => where += " $column=? and");
where = where.substring(0, where.length - 3);
return await dbClient.delete(table,
where: where, whereArgs: valuesCondition);
}
Future close() async {
var dbClient = await instance;
dbClient.close();
}
}
Now, If you want to insert Data into cart_details table
var cart = Cart();
cart.id = widget.product.id;
cart.title = widget.product.title;
cart.image = widget.product.image;
cart.price = widget.product.normalPrice;
cart.color = selectedColor;
cart.sizeselect = selectedSize;
// This needs only once in main.dart
await DatabaseHelper.sharedInstance.initDatabase();
await DatabaseHelper.sharedInstance.insertRecord(cart,CartTable.tbCartDetails);