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Mobile News from greenrobot
Library updates, new releases, related developments in open source, mobile databases, and Android
greenDAO 3 released
We are happy to announce greenDAO Version 3 today. Since its initial release 5 years ago, greenDAO has always been the fastest ORM for Android. It was also the first ORM to apply code generation for maximum performance. With greenDAO 3, we made code generation much more convenient: by adopting entity annotations you can drop the generator project. In its place comes the all new Gradle plugin, which automatically triggers code generation at build time. Like that, you can simply use greenDAO 3 annotations on your entities:
Database Encryption for Android N: SQLCipher 3.5
That's really good news. Just by using the new version 3.5.0 of SQLCipher, you can reduce your APK size (and build/deployment time). Not just the binary .so files got smaller, also the big "icudt46l.dat" file was removed in 3.5.0.
To see the effect in an app, we took the greenDAO example app and compared the resulting sizes. Of course, the version using built-in SQLite is by far the smallest, but your APK may lose 4.4 MB if you were using a previous version of SQLCipher:
We noticed one incompatibility with SQLCipher 3.5.x however. Android's SQLiteDatabase defines two additional collations:
In addition to SQLite's default BINARY collator, Android supplies two more, LOCALIZED, which changes with the system's current locale, and UNICODE, which is the Unicode Collation Algorithm and not tailored to the current locale.
Running SQL ORDER commands with "COLLATE LOCALIZED" does not work anymore starting with SQLCipher 3.5.0. That is the downside of the ICU (and ASOP code) removal.
So, what about greenDAO support for SQLCipher 3.5.x? greenDAO used "COLLATE LOCALIZED" in the QueryBuilder when specifying orders using string properties. To ensure compatibility with SQLCipher 3.5, we just released greendao-encryption V2.2.2 without the LOCALIZED collation.
greenDAO 3 Beta released
We just released greenDAO 3 beta: it makes the generator project optional and moves to Java annotations. Before the final release however, we want to get your feedback. In particular, we experimented with alternative annotation processing that gives greenDAO more power while it avoids byte code manipulation.Our goal with greenDAO3 is to put the developer in control over entity classes while augmenting the entity code with a little bit of generated code.
SQLite, ORMs, NoSQL: what Android developers use and why
At yesterday’s Droidcon Berlin barcamp, we compared different database approaches (SQLite, ORMs, NoSQL). In our interactive session we asked about 80 developers how they use databases on Android and what advantages and disadvantages they see in each approach. Here are the gathered results:
~40% of the participants have used SQLite without additional tools.