Rosetta

Overview

Rosetta is a Java library that leverages Jackson to take the pain out of mapping objects to/from the DB, designed to integrate seamlessly with jDBI. Jackson is extremely fast, endlessly configurable, and already used by many Java webapps.

Rosetta isn't an ORM. It doesn't silently read and write to your database, validate input, or manage connections. It does two things:

1. Binds Java objects to query parameters using a jDBI BindingAnnotation
2. Maps query results back to Java objects using a jDBI ResultSetMapperFactory

Usage

To use with jDBI on Maven-based projects, add the following dependency:

<dependency>
  <groupId>com.hubspot.rosetta</groupId>
  <artifactId>RosettaJdbi</artifactId>
  <version>3.11.2</version>
</dependency>

Binding

You can bind JDBI arguments in your DAO using @BindWithRosetta.

public interface MyDAO {
  @SqlUpdate("UPDATE my_table SET name = :name, type = :type WHERE id = :id")
  void update(@BindWithRosetta MyRow obj);
}

@BindWithRosetta behaves like jDBI's @BindBean, but it converts the object to a tree using Jackson which lets you use all the Jackson annotations you know and love to customize the representation. It's also generally more robust - it supports the not-quite-standard naming conventions, enums, fluent setters, nested objects (with dot-notation), getters without fields, etc.

Mapping

To register Rosetta globally for mapping, you can add it to your DBI like so:

dbi.registerMapper(new RosettaMapperFactory());

Or to test it out on a single DAO you would do:

@RegisterMapperFactory(RosettaMapperFactory.class)
public interface MyDAO { /* ... */ }

Or to use in combination with a Handle: (same idea to register on a Query)

handle.registerMapper(new RosettaMapperFactory());

Advanced Features

For a list of advanced features, see here