Database library that uses Korma to provide access and utilities to the DE's backend databases.
Korma doesn't currently support all of the database features that we need, so we've added some of the additional features that we need. All of the extensions are implemented in kameleon.core.
(use 'korma.core)
(use 'kameleon.core)
;; Entities with many-to-many relationships.
(declare foo bar)
(defentity foo
(entity-fields :baz)
(many-to-many bar :foo_bar
{:lfk :foo_id
:rfk :bar_id}))
(defentity bar
(entity-fields :quux)
(many-to-many foo :foo_bar
{:lfk :bar_id
:rfk :baz_id}))
;; Retrieving entities in many-to-many relationships.
(select foo
(kameleon-with bar))
;; Retrieving entities in has-one or belongs-to relationships as separate
;; entities.
(declare blarg glarb)
(defentity blarg
(entity-fields :field1 :field2)
(has-one glarb))
(defentity glarb
(entity-fields :field1 :field2)
(belongs-to blarg))
(select blarg
(with-object glarb))Korma doesn't currently support many-to-many relationships, which are used
extensively in the DE's metadata schema, so we needed to add them. Until the
code to support many-to-many relationships is incorporated into Korma itself,
using them will be a little cumbersome, but it will at least be possible.
Kameleon assumes that many-to-many relationships are implemented using a join
table that contains no fields other than the foreign keys. In the example
from the summary, the two entity tables are foo and bar, and the join
table is foo_bar.
In queries, it is necessary to use the kameleon-with macro instead of
Korma's with macro because many-to-many relationships aren't supported by
Korma yet. The results will look something like this:
user=> (pprint (select foo (kameleon-with bar)))
({:id 1,
:baz "some-value",
:bar
[{:id 1,
:quux "some-other-value"}]})When retrieving entities in has-one and belongs-to relationships, Korma
includes the column values of both objects in the same map at the same level.
If there are any duplicate column names then the two columns are distinguished
by appending an underscore and an integer to one or both column names. If all
columns are being obtained from both entities, however, then it can sometimes
be more convenient to obtain the related entity as a separate object.
To retrieve entities as separate objects in a query, simply use kameleon's
with-object macro in the query; the entity definition doesn't have to be
altered. The results will look something like this:
user=> (pprint (select blarg (with-object glarb)))
({:id 1,
:field1 "some-value",
:field2 "some-other-value",
:glarb
{:id 1,
:field1 "yet-another-value",
:field2 "still-another-value"}})Korma defines entities for most of the actual entities defined in the DE's metadata schema. The only exceptions are the entities that use composite primary keys, which aren't currently supported by Korma. (It wasn't as critical to add support for composite primary keys as it was to add support for many-to-many relationships, so we haven't added support for them yet.)
Attempting to describe each entity here would be a maintenance nightmare. For more information on the entities, please see the project's documentation page.
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Developed by: iPlant Collaborative at BIO5 at The University of Arizona http://www.iplantcollaborative.org
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