New to Android and realm,
I have heard a lot about using realm at the place of SQLite, But I want to store documents in Database. So Can we do it with Realm if yes then how can we do it?
Related
i have to work with a new app, that will use realm, the problem is that when have to up to play store the old app have room database.
Do you believe, if it can have a problem with the database change?.
Thanks for the help
Note: i do not have to save the old info
I want to store data locally in the phone after parsing it from JSON API and then make a button to synchronize that data whenever I need to so that the content can be used offline.
If you want to store data object locally, then you can make use of Realm DB. Below link explains how to use Realm DB https://www.androidhive.info/2016/05/android-working-with-realm-database-replacing-sqlite-core-data/
Right now, the best option to store bunch of data locally is using sqlite. You can search for it. There is a bunch of tutorials for it. Also, you can also use Room library which makes it really easy to create sqlite databases and interact with it.
I am new to Android. I literally just learn Android few days ago. I am just wondering, is there Entity Framework and LINQ equivalent for Android?
Also, I need to store/cache record to a local database. What the best database to use? I am thinking of using SQLite. Is it appropriate for Android?
Thanks!
You need an ORM(Object-Relational Mapper), there is a good cross platform ORM called Realm , Realm gives you a much more programmatic way of accessing and storing data in Objects just like LinQ or EntityFramework and executes queries pragmatically in an object oriented manner.
Sample Realm Code
RealmResults<User> result = realm.where(User.class)
.greaterThan("age", 10) // implicit AND
.beginGroup()
.equalTo("name", "Peter")
.or()
.contains("name", "Jo")
.endGroup()
.findAll();
Documentation
SqLite is appropriate to store local Data for example: if you are retrieving JSON, u can us an sqlite database to store some data for the offline mode, and of course u can use the cache as well, but i recommend u SQLite.
Hope i helped.
I am looking at ways to migrate a SQLite DB in an android app to Realm. The DB has about 2000 records that need to be inserted upon first load. Is there a way to do this using the migration mechanism (https://realm.io/docs/java/latest/#migrations) and createOrUpdateAllFromJson()?
Migrations are not really used to insert data on first load. RealmConfiguration has a method called initialData() that is much more suited for this: https://realm.io/docs/java/latest/api/io/realm/RealmConfiguration.Builder.html#initialData-io.realm.Realm.Transaction-
createOrUpdateAllFromJson() only makes sense if you can export you SQLite database to JSON. Most likely it will be much faster to just read the data directly from SQLite and insert them into Realm.
A more type-safe method would be to use copyToRealmOrUpdate() if you can somehow export your SQLite data to a in-memory object representation.
I want to fetch data from my sqlite database using AQuery. But I don't have any idea about that. So, Is it possible to fetch data from database using AQuery?? If yes, then How ?
AQuery is not designed for accessing local database. You can try some ORM, like Sprinkles or ORMLite.