Insert
public
abstract
@interface
Insert
implements
Annotation
| androidx.room.Insert |
Marks a method in a Dao annotated class as an insert method.
The implementation of the method will insert its parameters into the database.
All of the parameters of the Insert method must either be classes annotated with Entity
or collections/array of it.
Example:
@Dao
public interface MusicDao {
@Insert(onConflict = OnConflictStrategy.REPLACE)
public void insertSongs(Song... songs);
@Insert
public void insertBoth(Song song1, Song song2);
@Insert
public void insertAlbumWithSongs(Album album, List<Song> songs);
}
If the target entity is specified via entity() then the parameters can be of arbitrary
POJO types that will be interpreted as partial entities. For example:
@Entity
public class Playlist {
@PrimaryKey(autoGenerate = true)
long playlistId;
String name;
@Nullable
String description
@ColumnInfo(defaultValue = "normal")
String category;
@ColumnInfo(defaultValue = "CURRENT_TIMESTAMP")
String createdTime;
@ColumnInfo(defaultValue = "CURRENT_TIMESTAMP")
String lastModifiedTime;
}
public class NameAndDescription {
String name;
String description
}
@Dao
public interface PlaylistDao {
@Insert(entity = Playlist.class)
public void insertNewPlaylist(NameAndDescription nameDescription);
}
Summary
Public methods | |
|---|---|
Class<?>
|
entity()
The target entity of the insert method. |
int
|
onConflict()
What to do if a conflict happens. |
Inherited methods | |
|---|---|
Public methods
entity
public Class<?> entity ()
The target entity of the insert method.
When this is declared, the insert method parameters are interpreted as partial entities when the type of the parameter differs from the target. The POJO class that represents the entity must contain all of the non-null fields without default values of the target entity.
If the target entity contains a PrimaryKey that is auto generated, then the POJO
class doesn't need an equal primary key field, otherwise primary keys must also be present
in the POJO.
By default the target entity is interpreted by the method parameters.
| Returns | |
|---|---|
Class<?> |
the target entity of the insert method or none if the method should use the parameter type entities. |
onConflict
public int onConflict ()
What to do if a conflict happens.
Use OnConflictStrategy.ABORT (default) to roll back the transaction on conflict.
Use OnConflictStrategy.REPLACE to replace the existing rows with the new rows.
Use OnConflictStrategy.IGNORE to keep the existing rows.
| Returns | |
|---|---|
int |
How to handle conflicts. Defaults to OnConflictStrategy.ABORT.
|