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我正在创建一个Entity(Room Persistence lib)类Food,我想把它foodId作为自动增量.

@Entity
class Food(var foodName: String, var foodDesc: String, var protein: Double, var carbs: Double, var fat: Double)
{
    @PrimaryKey
    var foodId: Int = 0
    var calories: Double = 0.toDouble()
}

如何设置foodId自动增量字段？