68.4 Creating the Data Access Object

With the product entity defined, the next step is to create the DAO interface. Referring once again to the Project tool window, right-click on the app -> java -> com.ebookfrenzy.roomdemo entry and select the New -> Java Class menu option. In the new class dialog, enter ProductDao into the Name field and select Interface from the list as highlighted in Figure 68-1:

Figure 68-1

Click on OK to generate the new interface and, with the ProductDao.java file loaded into the code editor, make the following changes:

package com.ebookfrenzy.roomdemo;

 

import androidx.lifecycle.LiveData;

import androidx.room.Dao;

import androidx.room.Insert;

import androidx.room.Query;

 

import java.util.List;

 

@Dao

public interface ProductDao {

 

    @Insert

    void insertProduct(Product product);

 

    @Query("SELECT...