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我有一个存储在/ data/..文件夹中的realm数据库。当我通过android studio重新安装相同的应用程序版本时,该过程保留数据。但是如果我从较低的应用程序版本更新到更高版本,则会将其删除。什么原因以及如何在应用程序更新后保留此db?迁移代码:android应用更新后保持realm db
public class FRGMigration implements RealmMigration {
@Override
public void migrate(DynamicRealm realm, long oldVersion, long newVersion) {
if (oldVersion == 3) {
realm.getSchema().create("Settings")
.addField("id", Integer.class, FieldAttribute.PRIMARY_KEY)
.addField("userName", String.class)
.addField("cachePolitics", String.class)
.addField("soundUri", String.class)
.addField("cacheDir", String.class)
.addField("timeStamp", Long.class);
realm.getSchema().get("NewsItem")
.addField("teaser", String.class);
oldVersion++;
SettingsDB settingsDB = DependencyProvider.getInstance().provideSettingsDB();
Settings settings = settingsDB.getSettings();
settings.setTimeStamp(0L);
settingsDB.updateSettings(settings);
}
}
@Override
public int hashCode() {
return 37;
}
@Override
public boolean equals(Object obj) {
return obj instanceof FRGMigration;
}
}
我确实将此参数设置为“true”,但它在应用更新时不起作用,不幸的是 –
@ M.Maximovich您可以发布您的“RealmConfiguration”吗? – FiN
realmConfiguration = new RealmConfiguration.Builder().name(“settings.realm”).schemaVersion(4).migration(new FRGMigration()).build(); –