com.datastax.oss.driver.api.mapper.annotations

Annotation Type DefaultNullSavingStrategy

@Target(value=TYPE)
 @Retention(value=RUNTIME)
public @interface DefaultNullSavingStrategy

Annotates a Dao interface to define a default NullSavingStrategy, that will apply to all methods that don't explicitly declare one.

For example, given this interface:

 @Dao
 @DefaultNullSavingStrategy(SET_TO_NULL)
 public interface ProductDao {

   @Insert
   void insert(Product product);

   @Update(nullSavingStrategy = DO_NOT_SET)
   void update(Product product);
 }
 

• insert(Product) will use SET_TO_NULL (inherited from the DAO's default).
• update(Product) will use DO_NOT_SET.

If the DAO interface isn't annotated with DefaultNullSavingStrategy, any method that does not declare its own value defaults to DO_NOT_SET.

Note that null saving strategies are only relevant for Update, Insert, Query and SetEntity methods.

Required Element Summary

Required Elements

Modifier and Type	Required Element and Description
NullSavingStrategy	value

Element Detail

value

public abstract NullSavingStrategy value