Update some specific field of an entity in android Room

Question

I am using android room persistence library for my new project. I want to update some field of table. I have tried like in my Dao -

// Method 1         


        

Answer 1

According to SQLite Update Docs :

@Query("UPDATE tableName SET 
    field1 = :value1,
    field2 = :value2, 
    ...
    //some more fields to update
    ...
    field_N= :value_N
    WHERE id = :id)

int updateTour(long id, 
               Type value1, 
               Type value2, 
               ... ,
               // some more values here
               ... ,
               Type value_N);

Example:

Entity:

@Entity(tableName = "orders")
public class Order {

@NonNull
@PrimaryKey
@ColumnInfo(name = "order_id")
private int id;

@ColumnInfo(name = "order_title")
private String title;

@ColumnInfo(name = "order_amount")
private Float amount;

@ColumnInfo(name = "order_price")
private Float price;

@ColumnInfo(name = "order_desc")
private String description;

// ... methods, getters, setters
}

Dao:

@Dao
public interface OrderDao {

@Query("SELECT * FROM orders")
List getOrderList();

@Query("SELECT * FROM orders")
LiveData> getOrderLiveList();

@Query("SELECT * FROM orders WHERE order_id =:orderId")
LiveData getLiveOrderById(int orderId);

/**
* Updating only price
* By order id
*/
@Query("UPDATE orders SET order_price=:price WHERE order_id = :id")
void update(Float price, int id);

/**
* Updating only amount and price
* By order id
*/
@Query("UPDATE orders SET order_amount = :amount, price = :price WHERE order_id =:id")
void update(Float amount, Float price, int id);

/**
* Updating only title and description
* By order id
*/
@Query("UPDATE orders SET order_desc = :description, order_title= :title WHERE order_id =:id")
void update(String description, String title, int id);

@Update
void update(Order order);

@Delete
void delete(Order order);

@Insert(onConflict = REPLACE)
void insert(Order order);
}