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Android Jetpack: Room

admin by admin
March 31, 2020
in Công Nghệ
25
Android Jetpack: Room



Florina Muntenescu introduces Room, the database persistence library for Jetpack. Room allows you to:
* write less boilerplate code
* map query results to objects automatically
* provide compile-time checked queries
* test database operations, including migrations, more easily
* avoid performing any database operations on the main thread

Take a look at the resources below for more information!

Google I/O Room Talk →
Room persistence library guide →
Architecture Components code samples →
Persistence Codelabs →
Incrementally migrate from SQLite to Room →
7 Pro-tips for Room →
Room with a View codelab →

Watch more Android Jetpack videos here →

Subscribe to the Android Developers channel here →

#jetpack #featured

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Comments 25

  1. D'Angelo Barksdale says:
    2 years ago

    I'm gonna ask you this one time, where is database builder? i'll do one better, who is database builder? and I'll do one better more, why is database builder?

    Reply
  2. Benjamin Silva says:
    2 years ago

    My entity needed a list and i gave up

    Reply
  3. huiyun wang says:
    2 years ago

    how to load and read external database(SDcard )?

    Reply
  4. Troll Berserker says:
    2 years ago

    Can user dynamically create and delete tables from a database using Room?

    It seems like it works only with a predefined set of tables hardcoded by developer.

    Reply
  5. Sonic The Hedgehog says:
    2 years ago

    Android is Awesome And Cool i Got Samsung Galaxy Express Prime 3 from At&t it Got Android 9 pie now

    Reply
  6. Micheal Andretis says:
    2 years ago

    You guys need to clarify your relationships documentation. It's misleading and barely comprehensible. Room is supposed to reduce "boilerplate code" but a single join query requires way too much complex code.

    Reply
  7. Xylan says:
    2 years ago

    man I love her accent!

    Reply
  8. Carlos Bedoy says:
    2 years ago

    The really tricky part is when you want to use on your custom objects and relationships.

    Reply
  9. hitec16 says:
    2 years ago

    make a video to explain @Relation and @Embedded annotations. They are very confusing.

    Reply
  10. jerrytablet Vargas says:
    2 years ago

    55-55-

    Reply
  11. Htop Skills says:
    2 years ago

    Any official programming language for Android (Including Java) deserve a video like this

    Reply
  12. SnoopyDoo says:
    2 years ago

    Seems like Google is anti-boilerplate when it comes to just about anything. Seriously, I have no issues with boilerplates.

    Reply
  13. Salif Ka says:
    2 years ago

    Thankyou Sister for your tuto!Can you help me i have this error:cannot access database on the main thread since it may potentially lock the UI for a long time.I use arch components.in the Dao class:@SuppressWarnings(RoomWarnings.CURSOR_MISMATCH)

    @Query("SELECT * FROM user_table WHERE email=:email AND mdp=:mdp AND role=:role")

    User getUser(String email,String mdp,String role);
    ,the repository class:public User getUser(String email,String mdp,String role)

    {

    user=this.userDao.getUser(email,mdp,role);

    return user;

    } and the viewmodel this:public User getUser(String username,String mdp,String role)

    {

    return userrepository.getUser(username,mdp,role);

    } an i want use it for call it in the mainActivity like this:user=userViewModel.getUser(login,mdp,item);Thankyou!

    Reply
  14. Nicolas Maldonado says:
    2 years ago

    There is typo:
    The method It's not called fallbackToDestructiveMigrationsFrom() but fallbackToDestructiveMigrationFrom()

    Without an S in Migration

    Reply
  15. Gabriel Trifa says:
    2 years ago

    Awesome job, Florina!

    Reply
  16. Kathiriya Harshadbhai says:
    2 years ago

    Any ideas about export roomdb data into external Sdcard?

    Reply
  17. ram naam says:
    2 years ago

    Can we make one to many queries with room?

    Reply
  18. Bithros says:
    2 years ago

    How can i use a predifined sqlite.db with room? I have search the last hours but i can not find any solution. I think that this must be solved from google except if you already did it and i can not find it!

    Reply
  19. Vladislav Syrgashev says:
    2 years ago

    Hi Florina!!! As i see You are a pretty good at Room stuff in the whole world. Could you please help me understand one aspect of it. I am new at programming Android. So this is my kind of problem i got stuck with. I pretty much understand how this Room works. Anyway, I've got SQLite database file with 1000's of rows of data. And i want my project to fetch data from this .db file and populate RoomDatabase. But all solutions on Stackoverflow seem to fail. Can you show me the way to do it, please? Thank you.

    Reply
  20. Flawless Saturation says:
    2 years ago

    Well, she's Romanian.. But however she's good on English, and you can easly understand, what does she wants to tell to us, and of course I have watched this video not for learning but to impress myself that she is a Romanian and she became a Android Developer and presentator of Google Developers, Yeah she's earning a lot, but i don't take care about it, i also want to become an Android Developer not for money, but to show to people that i can break the ice, i have only 12 years and still understanding this, but however i'm learning everyday a little bit, and with this tempo i will know perfectly java language for android. So if you are an android beginner developer, don't worry about this, everyone was like you when they wanted to start this, soo don't take the Android Studio yet, because it will be hard to understand for you, just go to your phone and download Sketchware from Google Play, (In case that you are a beginner) . In this app you will develop your app also like android studio, but there codes are blocks, and every specific block is an code, but is much easier to understand, soo guys please leave a like on this comment, i hope that i helped you, Thanks

    Reply
  21. Николай Медведев says:
    2 years ago

    These teeth…

    Reply
  22. reda ABDI says:
    2 years ago

    Orm is evil, stay away from it

    Reply
  23. Burhan ARAS says:
    2 years ago

    Maybe the most beautiful Android developer! 🙂

    Reply
  24. Victor Gradinescu says:
    2 years ago

    Good job on improving your pronunciation. Keep up the good work!

    Reply
  25. Tobias Preuss says:
    2 years ago

    Where has version 2.0 been published? The Google Maven repository only lists androidx.room 2.0.0-alpha1. Release notes are missing, too.

    Reply

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