代替SQLite的手機數據庫：Realm

Realm是一個能夠代替SQLite和Core Data的手機數據庫。使用 C++ 內核，所以效率非常的高，是 sqlite 的近幾倍。

特性：

• Mobile-first: Realm is the first database built from the ground up to run directly inside phones, tablets and wearables.
• Simple: Data is directly exposed as objects and queryable by code, removing the need for ORM's riddled with performance & maintenance issues. Plus, we've worked hard to keep our API down to very few classes: most of our users pick it up intuitively, getting simple apps up & running in minutes.
• Modern: Realm supports easy thread-safety, relationships & encryption.
• Fast: Realm is faster than even raw SQLite on common operations, while maintaining an extremely rich feature set.
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Realm 中文文檔：http://djyde.github.io/2014/10/17/realm-doc-in-chinese.html

Realm realm = Realm.getInstance(this);

// All writes are wrapped in a transaction
// to facilitate safe multi threading
realm.beginTransaction();

// Add a person
Person person = realm.createObject(Person.class);
person.setName("Young Person");
person.setAge(14);

realm.commitTransaction();

RealmResults<User> result = realm.where(User.class)
                                 .greaterThan("age", 10)  // implicit AND
                                 .beginGroup()
                                      .equalTo("name", "Peter")
                                      .or()
                                      .contains("name", "Jo")
                                 .endGroup()
                                 .findAll();

項目主頁：http://www.baiduhome.net/lib/view/home/1413557451497