Android: LiveData and Room: Setup

Setup

Project's gradle 

Module's gradle

Room

Room has three main components of Room DB :

• Entity
• Dao
• Database

1. Entity - Represents a table within the database. Room creates a table for each class that has @Entity annotation
   
   
1. @PrimaryKey(autoGenerate = true)
2. @ColumnInfo(name = “column_name”)
3. @Ignore — field will not be persisted by Room
4. @Embeded — nested fields can be referenced directly in the SQL queries.
   
   
2. Dao - DAOs are responsible for defining the methods that access the database.
   
   
3. Database - Contains the database holder and serves as the main access point for the underlying connection to your app’s persisted, relational data.

Example

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1. SleepNight entity
   
   
2. Dao
   
   
3. Database