realm | 易学教程

Realm notifications that capture [weak self] in Swift

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问题 In the Realm documentation for Swift, the section on notifications has this sample code: class ViewController: UITableViewController { var notificationToken: NotificationToken? = nil override func viewDidLoad() { super.viewDidLoad() let realm = try! Realm() let results = realm.objects(Person.self).filter("age > 5") // Observe Results Notifications notificationToken = results.addNotificationBlock { [weak self] (changes: RealmCollectionChange) in guard let tableView = self?.tableView else {

Is It Possible To Migrate From Realm To Sqlite?

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问题 For some reasons(mainly large apk size even with ABI splits, anyway) i need to remove Realm completely and use Sqlite without losing data. I couldn't find a way. It seems the app must continue using Realm, or users will lost their data completely. Any idea will be appreciated 回答1: I don't think I understand fully what your problem is. If you are asking if there is a tool that will automate the data migration for you, then no, there is no such a tool. Otherwise it is rather straight forward:

1、什么是shiro

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1.什么是shiro? shiro是一个基于java的开源的安全框架。可以完成认证、授权、会话管理、加密、缓存等功能。 2.为什么去学习shrio 在java的世界中，有更早的安全框架。有spring security和shiro。Spring Security要依赖与Spring,并且比较复杂，学习成本比较高。shiro比较简单，而且标记独立，既可以在java se中使用，也可以在java ee中使用。并且在分布式集群环境下使用。 3.shiro的结构体系 (1) Authentication: 认证验证登录用户是否合法，也就是登录。 (2)Authorization:授权登录以后才会授权，授予谁具有访问某些资源的权限。 (3) Session Management:会话管理登录之后会产生一次session. sessionManagment就是管理用户特定的回话。 (4)Cryptography:加密通过使用加密算法保持数据安全同事易于使用。提供了常见的加密算法，使得数据在应用中可以很方便的实现数据安全，并且很方便。 (5)Web Support：web应用支持 shiro可以很方便的集成到web应用程序中 (6)Caching:缓存 shiro提供了对缓存的支持。支持多种缓存架构，如：ehcache、缓存数据库-Redis。 (7)Concurrency：并发支持

For Realm Swift, could I use DispatchQueue with autorelease frequency of .workItem instead of autoreleasepool?

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问题 From the doc we should be using: DispatchQueue(label: "background").async { autoreleasepool { let realm = try! Realm() let theDog = realm.objects(Dog.self).filter("age == 1").first try! realm.write { theDog!.age = 3 } } } However, that usage seems exactly how the following does: DispatchQueue(label: "background", autoreleaseFrequency: .workItem).async { let realm = try! Realm() let theDog = realm.objects(Dog.self).filter("age == 1").first try! realm.write { theDog!.age = 3 } } Could someone

group memberships in (AD) ldap Realm

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问题 I use the JAAS Framework for the authentification and authorization process in a java ee enterprise application. I use GlassFish as the application server. My realm configuration looks like: <auth-realm name="ads-realm" classname="com.sun.enterprise.security.auth.realm.ldap.LDAPRealm"> <property name="jaas-context" value="ldapRealm" /> <property name="base-dn" value="CN=Users,DC=company,DC=intern" /> <property name="directory" value="ldap://ad.company.intern:389" /> <property name="search

Update specific realm model properties?

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问题 How to update only some realm model properties and instead of trying to save complete realm model again and again using copyToRealmOrUpdate() . public class User extends RealmObject { @PrimaryKey public String id = UUID.randomUUID().toString(); private String name; private int age; @Ignore private int sessionId; // Standard getters & setters generated by your IDE… public String getName() { return name; } public void setName(String name) { this.name = name; } public int getAge() { return age;

Implementing ignoredProperties() on both a Object subclass and its own subclass

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问题 I'm new to Realm. I'm creating my models with a base class that inherits from Object, and custom subclasses of this base class. My model requires that the base class declares some properties as ignored by overriding the static ignoredProperties() method. When trying to override that method on some of the base class subclasses, I get a Swift compiler error stating that Class method overrides a 'final' class method . I don't have my base class implementation marked as final . I don't know if

Migrate from unencrypted realm to encrypted realm

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问题 I'm trying to migrate from unencrypted realm to encrypted but I don't know how and where to use Realm().writeCopy(toFile: url, encryptionKey: key) . or even if there is another way to do it. Thank you. 回答1: I found a way to do that, you can find it below: private static var realm: Realm! { // Get the encryptionKey var realmKey = Keychain.realmKey if realmKey == nil { var key = Data(count: 64) key.withUnsafeMutableBytes { (bytes) -> Void in _ = SecRandomCopyBytes(kSecRandomDefault, 64, bytes)

Realm database object seems empty, but then isn't

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问题 I am using Realm for a small, simple project. I'm using the latest version of the framework (compiled from Github yesterday) and the current AppStore version of Xcode with Swift 2.1. I am handing a Realm database object over from one view controller to another via a segue in prepareForSegue() , in order to edit it (and fill out the current values). Somehow, there seems to be a problem with the object in the target view controller. When I simply print() the object in the target view controller

@objc redundancy when having @objcMembers private dynamic var?

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问题 So I am using Realm with Swift and I marked my class with the @objcMembers keyword however when I tried to make some private variables, Xcode forced me to add @objc beside those private vars. Is this an intended behavior? Seems like it's redundant to me. @objcMembers class MyObject: Object { @objc dynamic private var text: String = String() @objc dynamic private var youtubeLink: String = String() @objc dynamic private var count: Int = 0 dynamic var isFavorite: Bool = false dynamic var