Hive Database in flutter

Hive is a fast, secure no SQL database implementation for flutter applications. Hive database in flutter uses dart package Hive for storing data locally and manipulating the data on a targeted device.

It stands out to be very fast in performing CRUD operations in comparison to SQLite and shared preference. Hive not only supports primitives, lists, and maps but also any Dart object you like. You need to generate a type adapter before you can store objects.

An offline To-Do App is a good example where you can use the hive database. Let’s check how we can implement hive in Flutter.

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Create a new project and add these dependencies:

dependencies:
  hive: ^2.0.5
  hive_flutter: ^1.1.0
  path_provider: ^2.0.8

dev_dependencies:
  hive_generator: ^1.1.2
  build_runner: ^2.1.7

dependencies:

hive: ^2.0.5

hive_flutter: ^1.1.0

path_provider: ^2.0.8

dev_dependencies:

hive_generator: ^1.1.2

build_runner: ^2.1.7

2. Hive can store data using dart primitive types, although, in production, we deal with model objects; to deal with objects, we need to generate TypeAdapter. typeID’ is the identity of the object for the Hive to find it. HiveField must be annotated on the required field names, with their unique id in parameters.

import 'package:hive/hive.dart';

part 'Model.g.dart';

@HiveType(typeId : 0)
class Person extends HiveObject{
  @HiveField(0)
  String? name;

  Person(this.name);
}

import 'package:hive/hive.dart';

part 'Model.g.dart';

@HiveType(typeId : 0)

class Person extends HiveObject{

@HiveField(0)

String? name;

Person(this.name);

}

3. Open the terminal and generate the file by entering the following: Flutter packages pub run build_runner build

4. After your .g file is generated,we have to register the adapter to be able to work with generated TYpe Adapter.

hiveInit() async {
    Directory appDocDirectory = await getApplicationDocumentsDirectory();
    var path = appDocDirectory.path;
    await Hive
      ..init(path)
      ..registerAdapter(PersonAdapter());
    getData();
  }

hiveInit() async {

Directory appDocDirectory = await getApplicationDocumentsDirectory();

var path = appDocDirectory.path;

await Hive

..init(path)

..registerAdapter(PersonAdapter());

getData();

}

CRUD OPERATIONS:

5. Open HIve box: We need to open a data box so that we can add data to it.

 Box box1 = await Hive.openBox('database');

1	Box box1 = await Hive.openBox('database');

6. Add data in the box.

addTask() async {
    Box box1 = await Hive.openBox('database');
    Person person = Person(controller.text);
    box1.add(person.name);
  }

addTask() async {

Box box1 = await Hive.openBox('database');

Person person = Person(controller.text);

box1.add(person.name);

}

7. Read the data you have added to the database.

getData() async {
    Box box1 = await Hive.openBox('database');
    setState(() {
      names = box1.values.toList();
    });
  }

getData() async {

Box box1 = await Hive.openBox('database');

setState(() {

names = box1.values.toList();

});

}

8. You can also update data in the database by using the putAt function and providing data you want to add an index for where you want to add your data.

Box box1 = await Hive.openBox('database');
await box1.putAt(index,UpdateController.text);

1 2	Box box1 = await Hive.openBox('database'); await box1.putAt(index,UpdateController.text);

9. For deleting you need to call the delete function.

Box box1 = await Hive.openBox('database');
box1.deleteAt(index);

1 2	Box box1 = await Hive.openBox('database'); box1.deleteAt(index);

That’s how we perform CRUD operations in Hive.

Demo app source code:

void main() async {
  runApp(const MyApp());
  WidgetsFlutterBinding.ensureInitialized();
}

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({Key? key}) : super(key: key);

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  TextEditingController controller = TextEditingController();
  TextEditingController UpdateController = TextEditingController();
  Person? person;
  List names = [];

  void initState() {
    super.initState();
    hiveInit();
  }

  hiveInit() async {
    Directory appDocDirectory = await getApplicationDocumentsDirectory();
    var path = appDocDirectory.path;
    await Hive
      ..init(path)
      ..registerAdapter(PersonAdapter());
    getData();
  }

  getData() async {
    Box box1 = await Hive.openBox('database');
    setState(() {
      names = box1.values.toList();
    });
  }

  addTask() async {
    Box box1 = await Hive.openBox('database');
    Person person = Person(controller.text);
    box1.add(person.name);
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("Hive demo"),
      ),
      body: SingleChildScrollView(
        child: Column(
          children: [
            Padding(
              padding: const EdgeInsets.all(20.0),
              child: TextField(
                controller: controller,
                decoration: InputDecoration(border: OutlineInputBorder()),
              ),
            ),
            ElevatedButton(
                onPressed: () async {
                  await addTask();
                  controller.clear();
                },
                child: Text("Add name")),
            ElevatedButton(
                onPressed: () {
                  getData();
                },
                child: Text("Read names")),
            ElevatedButton(
                onPressed: () async {
                  Box box1 = await Hive.openBox('database');
                  await box1.clear();
                  getData();
                },
                child: Text("Delete All")),
            Container(
              padding: EdgeInsets.all(20.0),
              height: MediaQuery.of(context).size.width / 2,
              child: ListView.builder(
                  itemCount: names.length,
                  itemBuilder: (BuildContext context, int index) {
                    return Row(
                      mainAxisAlignment: MainAxisAlignment.spaceBetween,
                      children: [
                        GestureDetector(
                          onTap: () {
                            showDialog(
                                context: context,
                                builder: (BuildContext context) {
                                  return AlertDialog(
                                    content:
                                        Text("Do you want to delete this?"),
                                    actions: [
                                      Row(
                                        children: [
                                          TextButton(
                                              onPressed: () {
                                                Navigator.pop(context);
                                              },
                                              child: Text("NO")),
                                          TextButton(
                                              onPressed: () async {
                                                Box box1 = await Hive.openBox(
                                                    'database');
                                                box1.deleteAt(index);
                                                getData();
                                                Navigator.pop(context);
                                              },
                                              child: Text("YES")),
                                        ],
                                      )
                                    ],
                                  );
                                });
                          },
                          child: Container(
                            height: 50,
                            width: 200,
                            child: Card(
                              color: Colors.grey,
                              elevation: 0.5,
                              child: Padding(
                                  padding: EdgeInsets.all(8.0),
                                  child: Text(
                                    names[index],
                                    style: TextStyle(fontSize: 16),
                                  )),
                            ),
                          ),
                        ),
                        IconButton(
                            onPressed: () async {
                              showDialog(
                                  context: context,
                                  builder: (BuildContext) {
                                    return AlertDialog(
                                      actions: [
                                        Column(
                                          children: [
                                            TextField(
                                              controller: UpdateController,
                                            ),
                                            TextButton(
                                                onPressed: () async {
                                                  Navigator.pop(context);
                                                  Box box1 = await Hive.openBox(
                                                      'database');
                                                  await box1.putAt(index,
                                                      UpdateController.text);
                                                  getData();
                                                },
                                                child: Text("Update Now"))
                                          ],
                                        )
                                      ],
                                    );
                                  });
                            },
                            icon: Icon(Icons.edit))
                      ],
                    );
                  }),
            )
          ],
        ),
      ),
    );
  }
}

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void main() async {

runApp(const MyApp());

WidgetsFlutterBinding.ensureInitialized();

}

class MyApp extends StatelessWidget {

const MyApp({Key? key}) : super(key: key);

@override

Widget build(BuildContext context) {

return MaterialApp(

title: 'Flutter Demo',

theme: ThemeData(

primarySwatch: Colors.blue,

home: MyHomePage(),

);

}

class MyHomePage extends StatefulWidget {

const MyHomePage({Key? key}) : super(key: key);

@override

_MyHomePageState createState() => _MyHomePageState();

}

class _MyHomePageState extends State<MyHomePage> {

TextEditingController controller = TextEditingController();

TextEditingController UpdateController = TextEditingController();

Person? person;

List names = [];

void initState() {

super.initState();

hiveInit();

}

hiveInit() async {

Directory appDocDirectory = await getApplicationDocumentsDirectory();

var path = appDocDirectory.path;

await Hive

..init(path)

..registerAdapter(PersonAdapter());

getData();

}

getData() async {

Box box1 = await Hive.openBox('database');

setState(() {

names = box1.values.toList();

});

}

addTask() async {

Box box1 = await Hive.openBox('database');

Person person = Person(controller.text);

box1.add(person.name);

}

@override

Widget build(BuildContext context) {

return Scaffold(

appBar: AppBar(

title: Text("Hive demo"),

body: SingleChildScrollView(

child: Column(

children: [

Padding(

padding: const EdgeInsets.all(20.0),

child: TextField(

controller: controller,

decoration: InputDecoration(border: OutlineInputBorder()),

ElevatedButton(

onPressed: () async {

await addTask();

controller.clear();

child: Text("Add name")),

ElevatedButton(

onPressed: () {

getData();

child: Text("Read names")),

ElevatedButton(

onPressed: () async {

Box box1 = await Hive.openBox('database');

await box1.clear();

getData();

child: Text("Delete All")),

Container(

padding: EdgeInsets.all(20.0),

height: MediaQuery.of(context).size.width / 2,

child: ListView.builder(

itemCount: names.length,

itemBuilder: (BuildContext context, int index) {

return Row(

mainAxisAlignment: MainAxisAlignment.spaceBetween,

children: [

GestureDetector(

onTap: () {

showDialog(

context: context,

builder: (BuildContext context) {

return AlertDialog(

content:

Text("Do you want to delete this?"),

actions: [

Row(

children: [

TextButton(

onPressed: () {

Navigator.pop(context);

child: Text("NO")),

TextButton(

onPressed: () async {

Box box1 = await Hive.openBox(

'database');

box1.deleteAt(index);

getData();

Navigator.pop(context);

child: Text("YES")),

)

);

});

child: Container(

height: 50,

width: 200,

child: Card(

color: Colors.grey,

elevation: 0.5,

child: Padding(

padding: EdgeInsets.all(8.0),

child: Text(

names[index],

style: TextStyle(fontSize: 16),

)),

IconButton(

onPressed: () async {

showDialog(

context: context,

builder: (BuildContext) {

return AlertDialog(

actions: [

Column(

children: [

TextField(

controller: UpdateController,

TextButton(

onPressed: () async {

Navigator.pop(context);

Box box1 = await Hive.openBox(

'database');

await box1.putAt(index,

UpdateController.text);

getData();

child: Text("Update Now"))

)

);

});

icon: Icon(Icons.edit))

);

}),

)

);

}

Output :

Thanks for reading this article ❤

If I got something wrong 🙈, let me know in the comments. I would love to improve.

You can also read: https://mobikul.com/bottom-navigation-bar-in-flutter/

nausheen Siddiqui 27 April 2023

. . .

Hive Database in flutter

CRUD OPERATIONS:

Demo app source code:

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