我正在尝试使用新的Architecture组件,但是当我尝试运行时,我得到:
"Error:(375, 24) error: There is a problem with the query: [SQLITE_ERROR] SQL error or missing database (no such table: posts)"
以下是我的课程 .
**实体 : **
@Entity
public static class Post {
@PrimaryKey
private String id;
@ColumnInfo(name = "data")
private String data;
public String getId() {
return id;
}
public void setData(String data) {
this.data = data;
}
public String getData() {
return data;
}
public void setId(String id) {
this.id = id;
}
}
DAO :
@Dao
public interface PostDao {
@Query("SELECT * FROM posts")
LiveData<List<Post>> getAll();
@Insert
void insertAll(Post... posts);
@Insert
void insert(Post post);
@Delete
void delete(Post post);
}
The database :
@Database(entities = {Post.class}, version = 1)
public static abstract class AppDatabase extends RoomDatabase {
public abstract PostDao postDao();
}
1 回答
https://developer.android.com/topic/libraries/architecture/room.html
看来你认为它会使自己的课程多元化 .
所以,要么使用
SELECT * FROM Post
或者做