caching into SQLite

DmitriyLewen · Sep 23, 2021 · 9ca519d · 9ca519d
1 parent 6abd7e9
commit 9ca519d
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Showing 5 changed files with 39 additions and 119 deletions.
diff --git a/lib/backend/database.dart b/lib/backend/database.dart
@@ -2,30 +2,30 @@ import 'package:fetchingapp/backend/sql_queries.dart';
 import 'package:path/path.dart';
 import 'package:sqflite/sqflite.dart';
 
-Future<Database> cacheDatabase() async {
+Future<Database> initializeDB() async {
   return openDatabase(join(await getDatabasesPath(), 'cache_database.db'),
       onCreate: (db, version) {
     return db.execute(Queries().createCacheTable);
   }, version: 1);
 }
 
 Future insertSQLite({required Map<String, dynamic> item}) async {
-  final db = await cacheDatabase();
+  final db = await initializeDB();
   db.insert('cache', item);
 }
 
 Future updateSQLite({required Map<String, dynamic> item}) async {
-  final db = await cacheDatabase();
+  final db = await initializeDB();
   db.update('cache', item, where: 'doc_id = ?', whereArgs: [item['doc_id']]);
 }
 
 Future deleteSQLite({required Map<String, dynamic> item}) async {
-  final db = await cacheDatabase();
+  final db = await initializeDB();
   db.delete('cache', where: 'doc_id = ?', whereArgs: [item['doc_id']]);
 }
 
 Future insertBatchSQLite({required List<Map<String, dynamic>> list}) async {
-  final db = await cacheDatabase();
+  final db = await initializeDB();
   final batch = db.batch();
   for (var item in list) {
     batch.insert('cache', item, conflictAlgorithm: ConflictAlgorithm.replace);
@@ -34,7 +34,7 @@ Future insertBatchSQLite({required List<Map<String, dynamic>> list}) async {
 }
 
 Future cleanDB() async {
-  final db = await cacheDatabase();
+  final db = await initializeDB();
   db.execute(Queries().dropCacheTable);
   db.execute(Queries().createCacheTable);
 }

diff --git a/lib/backend/firestore_listener.dart b/lib/backend/firestore_listener.dart
@@ -1,11 +1,6 @@
 import 'package:cloud_firestore/cloud_firestore.dart';
 import 'package:fetchingapp/backend/database.dart';
 import 'package:flutter/foundation.dart';
-import 'dart:convert';
-import 'package:cloud_firestore/cloud_firestore.dart';
-import 'package:fetchingapp/backend/database.dart';
-import 'package:http/http.dart' as http;
-import 'package:flutter/foundation.dart' show kIsWeb;
 
 class FirestoreChanges extends ChangeNotifier {
   List<Map<String, dynamic>> list = [];
@@ -45,94 +40,28 @@ class FirestoreChanges extends ChangeNotifier {
       notifyListeners();
     });
   }
-
-Future<List<Map>> readSQLiteCache() async {
-  final db = await cacheDatabase();
-  var cache = db.query('cache');
-  var value = cache.then((value) {
+
+  Future<List<Map>> readSQLiteCache() async {
+    final db = await initializeDB();
+    var cache = db.query('cache');
+    var value = cache.then((value) {
+      print(value.length);
+      return value;
+    });
     return value;
-  });
-  return value;
+  }
 }
 
-
+removeDocFromFirebase(String doc) async {
+  await FirebaseFirestore.instance
+      .collection('flutter-caching')
+      .doc(doc)
+      .delete();
 }
 
-// class Firestore {
-//   Future getData() async {
-//     return readCache().then((value) async {
-//       return value;
-//     });
-//   }
-// }
-
-class ApiProvider {
-  // final url = 'https://jsonplaceholder.typicode.com/comments';
-
-  // Future getData() async {
-  //   if (kIsWeb) {
-  //     return _getFromApi();
-  //   }
-  //   return _getFromDB();
-  // }
-
-  // Future getDataForFirestore() async {
-  //   return readSQLiteCache().then((value) async {
-  //     if (value.isNotEmpty) {
-  //       print('READING FROM DB, NUMBER OF ENTRIES: ${value.length}');
-  //       callFirestore();
-  //       return value;
-  //     } else {
-  //       return callFirestore();
-  //     }
-  //   });
-  // }
-
-  Future callFirestore() async {
-    cleanDB();
-    print('fetching from network');
-    var data = await FirebaseFirestore.instance
-        .collection('flutter-caching')
-        .orderBy('name')
-        .get();
-    var array = data.docs.map((e) {
-      return {'name': e['name']};
-    }).toList();
-    // await insertSQLite(list: array);
-    return array;
-  }
-
-  // Future _getFromDB() async {
-  //   return readJsonCache().then((value) {
-  //     if (value.isNotEmpty) {
-  //       print('reading from db');
-  //       return value;
-  //     } else {
-  //       print('fetching from network');
-  //       return _getFromApi();
-  //     }
-  //   });
-  // }
-
-//   Future _getFromApi() async {
-//     try {
-//       final req = await http.get(Uri.parse(url));
-//       if (req.statusCode == 200) {
-//         final body = req.body;
-//         final jsonDecoded = json.decode(body);
-
-//         // cache data
-//         if (!kIsWeb) {
-//           await cleanDB();
-//           await addBatchOfEntries(entries: jsonDecoded);
-//         }
-//         return json.decode(body);
-//       } else {
-//         return json.decode(req.body);
-//       }
-//     } catch (e) {
-//       // ignore
-//     }
-//   }
-// }
+editDocInFirebase(String value, String doc) async {
+  await FirebaseFirestore.instance
+      .collection('flutter-caching')
+      .doc(doc)
+      .update({'name': value});
 }
diff --git a/lib/screens/firestore_collection.dart b/lib/screens/firestore_collection.dart
@@ -1,5 +1,4 @@
 import 'package:cloud_firestore/cloud_firestore.dart';
-import 'package:fetchingapp/backend/database.dart';
 import 'package:fetchingapp/backend/firestore_listener.dart';
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
@@ -32,20 +31,6 @@ class _FirestoreCollectionCachingState
   }
 }
 
-removeDocFromFirebase(String doc) async {
-  await FirebaseFirestore.instance
-      .collection('flutter-caching')
-      .doc(doc)
-      .delete();
-}
-
-editDocInFirebase(String value, String doc) async {
-  await FirebaseFirestore.instance
-      .collection('flutter-caching')
-      .doc(doc)
-      .update({'name': value});
-}
-
 class DocList extends StatefulWidget {
   const DocList({Key? key}) : super(key: key);
 
@@ -97,7 +82,7 @@ class _DocListState extends State<DocList> {
 Widget inputfield() {
   final textController = TextEditingController();
 
-  void addDocToFirebase() {
+  addDocToFirebase() {
     // if (textController.text == '') {
     //   return;
     // }
@@ -126,6 +111,19 @@ Widget inputfield() {
           )));
 }
 
+removeDocFromFirebase(String doc) async {
+  await FirebaseFirestore.instance
+      .collection('flutter-caching')
+      .doc(doc)
+      .delete();
+}
+
+editDocInFirebase(String value, String doc) async {
+  await FirebaseFirestore.instance
+      .collection('flutter-caching')
+      .doc(doc)
+      .update({'name': value});
+}
 
 
 // Widget list({required BuildContext context}) {

diff --git a/lib/screens/home.dart b/lib/screens/home.dart
@@ -1,4 +1,3 @@
-import 'package:fetchingapp/backend/database.dart';
 import 'package:fetchingapp/backend/google_authentication.dart';
 import 'package:fetchingapp/screens/firestore_collection.dart';
 import 'package:fetchingapp/screens/login.dart';
@@ -34,11 +33,6 @@ class HomePage extends StatelessWidget {
                 'Firestore Collection',
                 style: TextStyle(fontSize: 25),
               )),
-          // ElevatedButton(
-          //     onPressed: () {
-          //       readCache();
-          //     },
-          //     child: const Text('Read Cache'))
         ],
       ),
     );

diff --git a/lib/screens/login.dart b/lib/screens/login.dart
@@ -12,7 +12,6 @@ class LoginPage extends StatefulWidget {
 class _LoginPageState extends State<LoginPage> {
   @override
   Widget build(BuildContext context) {
-    // FirebaseService().signOutFromGoogle();
     return Scaffold(
       appBar: AppBar(
         automaticallyImplyLeading: false,