package com.doumee.keyCabinet.dao;
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import android.content.Context;
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import androidx.room.Database;
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import androidx.room.Room;
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import androidx.room.RoomDatabase;
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@Database(entities = {FingerPrintDo.class}, version = 1,exportSchema = false)
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public abstract class FingerPrintDB extends RoomDatabase {
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public abstract FingerPrintDao fingerPrintDao();
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private static FingerPrintDB INSTANCE;
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private static final Object sLock = new Object();
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public static FingerPrintDB getInstance(Context context) {
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synchronized (sLock) {
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if (INSTANCE == null) {
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INSTANCE =
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Room.databaseBuilder(context.getApplicationContext(), FingerPrintDB.class, "FingerPrint.db")
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.allowMainThreadQueries()//Room不允许在主线程中访问数据库
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//.addMigrations(MIGRATION_1_2)//数据库迁移
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//.addMigrations(MIGRATION_1_2,MIGRATION_2_4,MIGRATION_1_4)//数据库迁移 ,可以用1_4,快速迁移
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.build();
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}
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return INSTANCE;
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}
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}
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}
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