🚀 Mastering Room Database Queries in Android: Essential & Custom Queries Explained

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Room Database is the official SQLite abstraction in Android, making database operations simple, robust, and efficient. Whether you’re storing user data, caching API responses, or managing offline data, understanding Room DB queries is crucial.

In this article, we’ll cover essential Room queries and how to write custom queries with real-world Android examples.

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🏛️ Create an Entity (Table)

@Entity(tableName = "users")
data class User(
    @PrimaryKey(autoGenerate = true) val id: Int = 0,
    val name: String,
    val email: String,
    val age: Int
)

We will be performing operations on the above table.

📜 Create DAO (Data Access Object)

@Dao
interface UserDao {
    @Insert
    suspend fun insertUser(user: User)

    @Query("SELECT * FROM users")
    fun getAllUsers(): List<User>
}

🔥 Essential Room…