Flutter Save Images as String in SQLite Database

Flutter Knowledge Sharing #59

Geno Tech
3 min readJul 22, 2022


Welcome to my next Flutter article about image saving in SQLite DB as a String. There have many ways to pick an image from the gallery and save it in your application for further use. Here I show you how we can encode an image as a String and decode it. Also, I want to say that this is a common use case in mobile applications. Let’s see how we can do it using the Flutter app development framework. Here I plan to show you how to pick an image from the gallery and save it in the SQLite Database as a string after encoding it, and finally, how to decode it and show it in a list view. Here the most useful parts are how to encode the image to a String and How to decode it into an image. Here we go !!!

Adding Dependencies

First, you must add the following dependencies to your pubspec.yaml.

sqflite: ^2.0.3
path_provider: ^2.0.11
async:io: ^1.0.3
shared_preferences: ^2.0.15
image_picker: ^0.8.5+3

Creating the Model

Create the model class called photo, which is used to upload and retrieve an image.

class photo {
late int? id = 0;
late String? photoName = "";
photo(int i, String imgString){
this.photoName = imgString;
Map <String, dynamic> toMap(){
var map = <String, dynamic>{
'id': id,
'photoName': photoName,
return map;
photo.fromMap(Map<String, dynamic>map){
id = map['id'];
photoName = map ['photoName'];

Creating the Database Helper Class

Here I am trying to save the image in SQLite DB. So we need to create a database helper class. Here include all the methods for saving and fetching the details from SQLite DB.

import 'dart:async';
import 'dart:io';
import 'package:path/path.dart';
import 'package:sqflite/sqflite.dart';
import 'package:path_provider/path_provider.dart';
import 'package:flutter_application_image/model/photo.dart';
class DBHelper{
static Database? _db;
static const String ID ='id';
static const String NAME = 'photoName';
static const String TABLE = 'photosTable';
static const String DB_Name = 'photos.db';
Future<Database?> get db async {
if (null != _db){
return _db;
_db = await initDB();
return _db;
initDB() async{
Directory documentsDirectory = await getApplicationDocumentsDirectory();
String path = join(documentsDirectory.path, DB_Name);
var db = await openDatabase(path, version: 1, onCreate: _onCreate);
return db;
_onCreate(Database db, int version) async{
await db.execute('CREATE TABLE $TABLE ($ID INTEGER, $NAME TEXT)');

Future<photo> save(photo photo) async {
var dbClient = await db;
photo.id = await dbClient!.insert(TABLE, photo.toMap());
return photo;
Future<List<photo>> getPhotos() async {
var dbClient = await db;
List<Map> maps = await dbClient!.query(TABLE, columns: [ID, NAME]);
List<photo> photos = [];
for(int i = 0; i < maps.length; i++){
photos.add(photo.fromMap(Map<String, dynamic>.from(maps[i])));
print("photos {{$photos}}");
return photos;
Future close() async {
var dbClient = await db;

Pick up and Encode the Image.

The following method is used to get images from the gallery and save them in the SQLite database as String.

pickImageFromGallery() {
ImagePicker().pickImage(source: ImageSource.gallery).then((imgFile) async {
String imgString = Utility.base64String(await imgFile!.readAsBytes());
photo photo1 = photo(0, imgString);

Decode and Showing the Image

return Padding(
padding: EdgeInsets.all(5.0),
child: GridView.count(
crossAxisCount: 2,
childAspectRatio: 1.0,
mainAxisSpacing: 4.0,
crossAxisSpacing: 4.0,
children: images.map((photo) {
print("photo name");
return Utility.imageFromBase64String(photo.photoName ?? "");

Utility Class for Encoding and Decoding the Image

Here is the utility class used to encode and decode image data.

import 'dart:typed_data';
import 'package:shared_preferences/shared_preferences.dart';
import 'package:flutter/material.dart';
import 'dart:async';
import 'dart:convert';
class Utility {
static Image imageFromBase64String(String base64String) {
return Image.memory(
fit: BoxFit.fill,
static Uint8List dataFromBase64String(String base64String) {
return base64Decode(base64String);
static String base64String(Uint8List data) {
return base64Encode(data);

I think this article was helpful for you to have a piece of knowledge on how to save images as String in SQLite database. You can find the complete code by clicking the following link.

Happy Coding !!!!
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Geno Tech

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