我有一个具有下一个结构的旧数据库: 数据库结构
问题是在 Room Persistence Database 中创建和填充表的最佳方式是什么。我现在这样做的方式是将表数据存储在 strings.xml 中,然后使用 firstrun 将其推送到数据库中。
public void createDb(final Context context) {
mIsDatabaseCreated.setValue(false);
prefs = context.getSharedPreferences(context.getPackageName(), Context.MODE_PRIVATE);
boolean isFirstRun = prefs.getBoolean(prefKey, true);
Observable.just(Room.databaseBuilder(context.getApplicationContext(),
AppDatabase.class, AppDatabase.DATABASE_NAME).build())
.map(appDatabase1 -> DatabaseInitUtil.initializeDb(
appDatabase1,
context.getResources().getStringArray(R.array.themes),
isFirstRun))
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(appDatabase -> {
mDb = appDatabase;
mIsDatabaseCreated.setValue(true);
});
prefs.edit().putBoolean(prefKey, false).apply();
}
static AppDatabase initializeDb(AppDatabase appDatabase, String[] themes, boolean isFirstRun) {
if (isFirstRun) {
List<ThemeEntity> themesEntities = new ArrayList<>(themes.length);
generateData(themesEntities, themes);
return insertData(appDatabase, themesEntities);
} else {
return appDatabase;
}
}
private static void generateData(List<ThemeEntity> themesEntities, String[] themes) {
for (String theme : themes) {
ThemeEntity themeEntity = new ThemeEntity();
themeEntity.setTheme(theme);
themesEntities.add(themeEntity);
}
}
<string-array name="themes">
<item>@string/courage</item>
<item>@string/death</item>
<item>@string/forgiveness</item>
<item>@string/faith</item>
<item>@string/family</item>
<item>@string/encouragement</item>
<item>@string/friendship</item>
<item>@string/joy</item>
<item>@string/life</item>
<item>@string/love</item>
<item>@string/relationship</item>
<item>@string/strength</item>
</string-array>
但我认为将大量数据存储在字符串数组中并在第一次运行时获取它是不正确的方法。