Example: sqlite in flutter
import 'dart:async';
import 'dart:io';
import 'package:path/path.dart';
import 'package:path_provider/path_provider.dart';
import 'package:sqflite/sqflite.dart';
import 'Product.dart';
class SQLiteDbProvider {
SQLiteDbProvider._();
static final SQLiteDbProvider db = SQLiteDbProvider._();
static Database _database;
Future<Database> get database async {
if (_database != null)
return _database;
_database = await initDB();
return _database;
}
initDB() async {
Directory documentsDirectory = await
getApplicationDocumentsDirectory();
String path = join(documentsDirectory.path, "ProductDB.db");
return await openDatabase(
path, version: 1,
onOpen: (db) {},
onCreate: (Database db, int version) async {
await db.execute(
"CREATE TABLE Product ("
"id INTEGER PRIMARY KEY,"
"name TEXT,"
"description TEXT,"
"price INTEGER,"
"image TEXT"")"
);
await db.execute(
"INSERT INTO Product ('id', 'name', 'description', 'price', 'image')
values (?, ?, ?, ?, ?)",
[1, "iPhone", "iPhone is the stylist phone ever", 1000, "iphone.png"]
);
await db.execute(
"INSERT INTO Product ('id', 'name', 'description', 'price', 'image')
values (?, ?, ?, ?, ?)",
[2, "Pixel", "Pixel is the most feature phone ever", 800, "pixel.png"]
);
await db.execute(
"INSERT INTO Product ('id', 'name', 'description', 'price', 'image')
values (?, ?, ?, ?, ?)",
[3, "Laptop", "Laptop is most productive development tool", 2000, "laptop.png"]
);
await db.execute(
"INSERT INTO Product ('id', 'name', 'description', 'price', 'image')
values (?, ?, ?, ?, ?)",
[4, "Tablet", "Laptop is most productive development tool", 1500, "tablet.png"]
);
await db.execute(
"INSERT INTO Product ('id', 'name', 'description', 'price', 'image')
values (?, ?, ?, ?, ?)",
[5, "Pendrive", "Pendrive is useful storage medium", 100, "pendrive.png"]
);
await db.execute(
"INSERT INTO Product ('id', 'name', 'description', 'price', 'image')
values (?, ?, ?, ?, ?)",
[6, "Floppy Drive", "Floppy drive is useful rescue storage medium", 20, "floppy.png"]
);
}
);
}
Future<List<Product>> getAllProducts() async {
final db = await database;
List<Map> results = await db.query(
"Product", columns: Product.columns, orderBy: "id ASC"
);
List<Product> products = new List();
results.forEach((result) {
Product product = Product.fromMap(result);
products.add(product);
});
return products;
}
Future<Product> getProductById(int id) async {
final db = await database;
var result = await db.query("Product", where: "id = ", whereArgs: [id]);
return result.isNotEmpty ? Product.fromMap(result.first) : Null;
}
insert(Product product) async {
final db = await database;
var maxIdResult = await db.rawQuery("SELECT MAX(id)+1 as last_inserted_id FROM Product");
var id = maxIdResult.first["last_inserted_id"];
var result = await db.rawInsert(
"INSERT Into Product (id, name, description, price, image)"
" VALUES (?, ?, ?, ?, ?)",
[id, product.name, product.description, product.price, product.image]
);
return result;
}
update(Product product) async {
final db = await database;
var result = await db.update(
"Product", product.toMap(), where: "id = ?", whereArgs: [product.id]
);
return result;
}
delete(int id) async {
final db = await database;
db.delete("Product", where: "id = ?", whereArgs: [id]);
}
}