如何避免在Android Room中重复

Question

我想创建一个存储踏板车名称的应用程序，但是当我搜索名称时，我得到的重复项是，我正在使用Room for Android，这是我的代码。任何人都请帮助我，谢谢。

POJO类

@PrimaryKey(autoGenerate = true)
private int id;

@ColumnInfo(name = "battery")
private String battery;

@ColumnInfo(name = "code")
private String birdCode;

@ColumnInfo(name = "latitude")
private double lat;

@ColumnInfo(name = "longitude")
private double lng;

Dao界面

@Query("SELECT * FROM BirdsRoom" )
List<BirdsRoom> getCachedBirds();

@Insert(onConflict = OnConflictStrategy.REPLACE)
void insertBirds(BirdsRoom... birdsRoom);

我如何插入数据

Birds birds = response.body().getBirdsList().get(i);
BirdLocation birdLocation = birds.birdLocation;
BirdLocation location = birds.birdLocation;
BirdsRoom birdsRoom = new BirdsRoom(birds.getCode(),birds.getBatteryLevel(), 
birdLocation.getLat(), birdLocation.getLng());
birdsDatabase.getUserDao().insertBirds(birdsRoom);

Answer 1

如果您想在BirdsRoom中成为唯一的电池和代码来设置如下所示的注释

@Entity(indices = {@Index(value = {"battery", "code"}, unique = true)})
public class BirdsRoom {

@PrimaryKey(autoGenerate = true)
private int id;

@ColumnInfo(name = "battery")
private String battery;

@ColumnInfo(name = "code")
private String birdCode;

@ColumnInfo(name = "latitude")
private double lat;

@ColumnInfo(name = "longitude")
private double lng;