![]() Easy to use powerful APIs covering relations and joins.Maximum performance (probably the fastest ORM for Android) our benchmarks are open sourced too.This way you can store, update, delete, and query for Java objects using a simple object oriented API. greenDAO frees you from these by mapping Java objects to database tables (called ORM, “object/relational mapping”). Still, writing SQL and parsing query results are quite tedious and time-consuming tasks. SQLite is an awesome embedded relational database. It relieves developers from dealing with low-level database requirements while saving development time. GreenDAO is an open source Android ORM making development for SQLite databases fun again. For existing apps based on greenDAO we offer DaoCompat for an easy switch (see also the announcement). To fix this, you just need to change the Entity class a bit, and allow the fields to be Nullable.Note: for new apps we recommend ObjectBox, a new object-oriented database that is much faster than SQLite and easier to use. ![]() Val title: String In Kotlin, this means that title can never be null. And thus, when you try to add a record with one of these values as null, you will get an SQLiteConstraintException. ![]() The generated columns like title, description, info and url will be marked as NOT NULL. This happens because the generated schema for your tables mark some of the table’s columns as NOT NULL.įor example, if you Entity class looks like this: = "books") You might come across this error when you are using Room database on Android. Caused by: :Ĭonstraint failed: (code 1299 SQLITE_CONSTRAINT_NOTNULL)
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