package com.doumee.keyCabinet.dao;

import android.content.Context;

import androidx.room.Database;
import androidx.room.Room;
import androidx.room.RoomDatabase;

@Database(entities = {FingerPrintDo.class}, version = 1,exportSchema = false)
public abstract class FingerPrintDB extends RoomDatabase {
    public abstract FingerPrintDao fingerPrintDao();
    private static FingerPrintDB INSTANCE;
    private static final Object sLock = new Object();

    public static FingerPrintDB getInstance(Context context) {
        synchronized (sLock) {
            if (INSTANCE == null) {
                INSTANCE =
                        Room.databaseBuilder(context.getApplicationContext(), FingerPrintDB.class, "FingerPrint.db")
                                .allowMainThreadQueries()//Room不允许在主线程中访问数据库
                                //.addMigrations(MIGRATION_1_2)//数据库迁移
                                //.addMigrations(MIGRATION_1_2,MIGRATION_2_4,MIGRATION_1_4)//数据库迁移 ,可以用1_4,快速迁移
                                .build();
            }
            return INSTANCE;
        }
    }
}