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Generating DAOs

Introduction | Fields | Tables | Views

The fields, tables and views you define must be turned into DAOs (Database Access Objects).

There are five hierarchical levels:

  1. System Definition
    • Firstly, system definition items, used for common system overrides. It is important that these are first, as we can then make the rest configurable, based on their set-up (e.g. turn fields/tables on and off with a boolean system definition item)
  2. Fields
    • Fields are the top level of the DAO; they can be shared amongst tables and so are built ahead of tables
  3. Tables
    • Create the DAOs for all the system tables
  4. HFT
    • The HFT layer is a cache sitting above the database for rapid access to the data; it is used for rapidly updated data, such as price
    • Views are the final layer and are used in many Genesis components. They enable us to take fields from more than one table to create a coherent view of information

Each layer uses the layers above in the hierarchy, so fields can use system definitions and views can use all the other four.

Running the commands

Using intelliJ's gradle option, you will have a project with a project_name-dictionary-cache submodule, which contains the tasks for generating Genesis DAOs.

Each of the following has a sub-menu that takes you to the assemble build task:

Commands for DAO generation

Dao TypeGradle Task
System Definitiongenesis-generated-sysdef


Gradle build errors in project and no gradle commands listed in IntelliJ

If you don't see any menu options per the guide above, and see gradle errors trying to build or on opening a project, a common cause is gradle jvm settings.

In IntelliJ go to File -> Settings and search for the Build Gradle page. Make sure Gradle JVM is set to 11, as shown below: