房间数据库自动生成PrimaryKey

Question

@Entity
data class SegmentEntity(
@PrimaryKey(autoGenerate = true)
val id: Long,
var rideRelatedId: Long?,
var name: String?,
var speed: String?

SegmentEntity(0,3,"Dan","90")

Answer 1

您可以将数据类更改为bellow并将您的id从Contractor中删除：

    @Entity
data class SegmentEntity(

    var rideRelatedId: Long?,
    var name: String?,
    var speed: String?
) {
    @PrimaryKey(autoGenerate = true)
    val id: Long? = null;
}

或者可以将默认值null设置为您的id，如下所示：

@Entity
data class SegmentEntity(
    @PrimaryKey(autoGenerate = true)
    val id: Long? = null,
    var rideRelatedId: Long?,
    var name: String?,
    var speed: String?
)  

在这种情况下，您必须调用您的类：

SegmentEntity(name = "nameValue",rideRelatedId = 1 ,speed ="speedValue")