CODEWITHSUNDEEP
javaandroidgenericsandroid-roomdao
M.Saeed Palideh
M.Saeed Palideh

Reputation: 191

Getting Error while using Generic Dao in room with java

when I try to use Generic Dao in android Room I get this Erro :

Cannot use unbound generics in query methods. It must be bound to a type through base Dao class.

import android.arch.lifecycle.LiveData;
import android.arch.persistence.room.Dao;
import android.arch.persistence.room.Delete;
import android.arch.persistence.room.Insert;
import android.arch.persistence.room.RawQuery;
import android.arch.persistence.room.Update;

import java.util.List;

@Dao
public interface BaseDaoAccess<T> {
    @Insert
    Long Insert(T entity);

    @Update
    void Update(T entity);
    @Delete
    void Delete(T entity);

    @RawQuery
    LiveData<List<T>> RowQuery(String query);

}

Upvotes: 0

Views: 1042

Answers (1)

chrylis -cautiouslyoptimistic-
chrylis -cautiouslyoptimistic-

Reputation: 77177

Due to type erasure, Java can't tell at runtime what T you mean. You can provide this information by creating a subtype that has the T bound to a specific type, such as this:

public interface CarDao extends BaseDaoAccess<Car> { }

Upvotes: 1

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