Sqflite Database Data Saved (Create) in the Table with Flutter

 import "package:flutter/material.dart";

import "package:sqflite/sqflite.dart";
import "package:path/path.dart";

/// Sqflite Database : Below code is for creating database tables and save data in the database
/// as shown below.

void main()
{
  runApp(const MyApp());
}
class MyApp extends StatelessWidget
{
  const MyApp({super.key});
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: "Sqflite Data Saved in the Database",
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        primarySwatch: Colors.grey,
      ),
      home: const HomePage(),
    );
  }
}
class HomePage extends StatefulWidget
{
  const HomePage({super.key});
  @override
  State<HomePage> createState()
  {
    return HomePageState();
  }
}
class HomePageState extends State<HomePage>
{
  final TextEditingController _controller = TextEditingController();

  final _formKey = GlobalKey<FormState>();

  late Future<Database> _database;

  @override
  void initState()
  {
    super.initState();
    _openDatabase();
  }

  Future<void> _openDatabase() async {
    _database = openDatabase(join(await getDatabasesPath(), "example_database.db"),
      onCreate: (db, version) {
      return db.execute("CREATE TABLE users(id INTEGER PRIMARY KEY, name TEXT)");
      },
      version: 1,
    );
  }

  Future<void> _insertUser(String name) async {
    final Database db = await _database;

    await db.insert(
      "users",
      {
        "name" : name,
      },
      conflictAlgorithm: ConflictAlgorithm.replace,
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text("Sqflite Database Flutter"),
        centerTitle: true,
        backgroundColor: Colors.grey,
      ),
      body: Center(
        child: Form(
          key: _formKey,
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: <Widget>[
              TextFormField(
                controller: _controller,
                decoration: const InputDecoration(
                  labelText: "Enter Username",
                ),
                validator: (value) {
                  if(value!.isEmpty)
                    {
                      return "Please enter some text";
                    }
                  return null;
                },
              ),
              const SizedBox(height: 20.0),
              ElevatedButton(
                onPressed: () {
                  if(_formKey.currentState!.validate())
                    {
                      _insertUser(_controller.text);
                      _controller.clear();
                      ScaffoldMessenger.of(context).showSnackBar(
                        const SnackBar(content: Text("User inserted Successfully"),),
                      );
                    }
                },
                style: ElevatedButton.styleFrom(
                  backgroundColor: Colors.blue,
                ),
                child: const Text("Submit data",
                  style: TextStyle(fontWeight: FontWeight.bold, color: Colors.white),
                ),
              ),
            ],
          ),
        ),
      ),
    );
  }
}