[ADD] update and insert coupon

app/src/main/java/com/a1/nextlocation/data/db/dao/CouponDao.java

@@ -22,6 +22,9 @@ public interface CouponDao {
     @Query("SELECT * FROM coupon")
     LiveData<List<Coupon>> selectAll();
 
+    @Update
+    public void update(Coupon coupon);
+
     /*
     to add an observer to the livedata, you can use the example from https://medium.com/mindorks/using-room-database-with-livedata-android-jetpack-cbf89b677b47
      */

app/src/main/java/com/a1/nextlocation/data/db/repositories/CouponRepository.java

@@ -20,6 +20,14 @@ public class CouponRepository {
         mAllCoupons = mCouponDao.selectAll();
     }
 
+    public void insert(Coupon... coupons) {
+        mCouponDao.insertAll(coupons);
+    }
+
+    public void update(Coupon coupon) {
+        mCouponDao.update(coupon);
+    }
+
     public LiveData<List<Coupon>> getAllCoupons() {
         return mAllCoupons;
     }