realm-database | 易学教程

How to apply multiple filters to realm database results

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问题 I am new to programming & trying to apply filters using UISwitches Currently I have: A realm database returning all the objects A UI that uses Switches to send filters Things Attempted: Subqueries, however I don't know the proper format to write it for realm Goal: Apply multiple filters to realm database results User Interface: Realm Database: class Question: Object { @objc dynamic var neverAttempted: Bool = true @objc dynamic var correct: Int = 0 @objc dynamic var flagged: Bool = false @objc

How to apply multiple filters to realm database results

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How to backup Realm DB in Android before deleting the Realm file. Is there any way to restore the backup file?

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问题 I am working on an Android application where I will be deleting Realm before copying the new data to Realm. Is there any way I can take backup of the data before deleting it and restore it back if something is wrong when using realm.copyToRealm() ? 回答1: Realm.writeCopyTo might be helpful for this case. You can find doc here. //Backup Realm orgRealm = Realm.getInstance(orgConfig); orgRealm.writeCopyTo(pathToBackup); orgRealm.close(); //Restore Realm.deleteRealm(orgConfig); Realm backupRealm =

Saved ImageView not appearing after saving it as byte[]

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问题 I am planning to save this ImageView : to my RealmDatabase, but the image is not appearing when I want to retrieve it. it should appear here: here is the my onSaveExpense code public void onSaveExpense() { //TODO - BITMAP EXPENSE ICONS if (mCategoriesSpinnerAdapter.getCount() > 0 ) { if (!Util.isEmptyField(etTotal)) { Category currentCategory = (Category) spCategory.getSelectedItem(); String total = etTotal.getText().toString(); String description = etDescription.getText().toString(); Bitmap

How to backup Realm DB in Android before deleting the Realm file. Is there any way to restore the backup file?

阅读更多关于 How to backup Realm DB in Android before deleting the Realm file. Is there any way to restore the backup file?

I am working on an Android application where I will be deleting Realm before copying the new data to Realm. Is there any way I can take backup of the data before deleting it and restore it back if something is wrong when using realm.copyToRealm() ? Realm.writeCopyTo might be helpful for this case. You can find doc here. //Backup Realm orgRealm = Realm.getInstance(orgConfig); orgRealm.writeCopyTo(pathToBackup); orgRealm.close(); //Restore Realm.deleteRealm(orgConfig); Realm backupRealm = Realm.getInstance(backupConfig); backupRealm.writeCopyTo(pathToRestore); backupRealm.close(); orgRealm =