Data Access Objects or DAOs are responsible for defining the methods that access the underlying database. In this video, use the @Dao annotation to create the needed classes for Room to work with.
- [Instructor] Recall that the data access object, or DAO,…is responsible for defining the methods…that access the database.…You can think of it as a container for the CRUD methods…that you wanna have executed against your DB.…You can create a DAO that can be processed by room…by using the @Dao annotation…on an interface or an abstract class,…then inside of that class,…you will provide the annotated methods…for the CRUD operations you wanna perform.…
For example, if you wanted to get a list…of all of the recipe records,…then you would define a method like the following.…So you have the @Query annotation with it's value…and the you have the method name, get all recipes,…as well as the return type.…Room ships with various annotations…that we can use for each of the CRUD methods:…@Query where we can generate select statements,…@Insert for the insert statements,…@Update for our update statements,…and then finally @Delete for our delete statements.…
Let's move over to Android Studio…so we can create the DAOs for our application.…
To begin, Annyce Davis reviews using the de facto data persistence solution available on Android: SQLite. She takes you through basic SQLite concepts—such as how to create a database wrapper and insert data into a table—as well as a few more advanced topics. Next, she covers working with Cupboard, an open-source project dedicated to simplifying your SQLite interactions. To wrap up, she dives into working with Realm, an object database solution designed with mobile devices in mind. Throughout the course, Annyce discusses establishing relationships between database tables, creating and running queries, as well as performing data migrations.
- Overview of SQLite
- Defining a database table's schema
- Exploring SQLite create table syntax
- Executing create table statements
- Inserting data with a foreign key relation
- Inspecting the database using a terminal
- Updating and deleting records
- Working with Cupboard
- Working with Realm
Skill Level Intermediate
Q: This course was updated on 05/24/2018. What changed?
A: New videos were added that cover working with Room.
Android App Development: Unit Testingwith James P White2h 58m Intermediate
Learning Firebase Cloud Messaging for Androidwith Joe Marini52m 49s Intermediate
1. SQLite Basics
2. SQLite Beyond the Basics
3. Working with Room
4. Working with Cupboard
5. Realm Basics
6. Realm Beyond the Basics
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