JDL Driver Download
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JDL is a JHipster specific domain language where we have added the possibility to describe all your entities and their relationships in a single file with a simple and user-friendly syntax.
You can use our online JDL-Studio IDE to create JDL and its UML visualization. You can create and export or share URL of your JDL as well.
You can generate entities from a JDL file using the import-jdl sub generator. Simply run yo jhipster:import-jdl yourJdlFilePath.jh
from the root of the generated JHipster application.
- this can be used as a replacement to using the entity sub-generator. The idea is that it is much easier to manage relationships using a visual tool than with the classical Yeoman questions and answers.
The JDL project is available on Github, it is an Open Source project like JHipster (Apache 2.0 licence). This can be used a node library to do JDL parsing. If you like this project, don’t forget to give us a star on GitHub!
Here’s what’s covered on this page:
The Oracle example has been translated into JDL, and is available here. The same is loaded by default in JDL-Studio as well.
How to use it
You can use it by:
- simply creating a file with the extension ‘.jh’,
- declare your entities and relationships or create and download the file with JDL-Studio,
- in your JHipster application’s root folder, simply run
jhipster:import-jdl yourfile.jh
.

and Voilà, you are done!
The language
We tried to keep the syntax as friendly as we can for Java developers.You can do three things with it: declare entities with their attributes, declare the relationships between them and declare some JHipster specific options.
The entity declaration is done as follows:
<entity name>
is the name of the entity,<field name>
the name of one field of the entity,<type>
the JHipster supported type of the field,and as an option
<validation>
the validations for the field.
The possible types and validations are those described here, if the validation requires a value, simply add (<value>)
right after the name of the validation.
Here’s an example of a field declaration with validations:
The relationships declaration is done as follows:
(OneToMany ManyToOne OneToOne ManyToMany)
is the type of your relationship,<from entity>
is the name of the entity owner of the relationship,<to entity>
is the name of the entity where the relationship goes to,<relationship name>
is the name of the relationship in the entity.
Here’s a simple example:
A Book has one Author, an Author has several Books.
Relationships
The relationship OneToMany A to B is equivalent to the relationship ManyToOne B to A, you only need make one of them.
The field used to represent a relationship is, by default, id
. This can be modifed with the following syntax for the <relationship name>
token above: <relationship field>(<display field>)
.
Enum

To make Enums with JDL just do as follows:
Declare an Enum where you want in the file:
In an entity, add field with the Enum as a type:
Blob (byte[])
JHipster gives a great choice as one can choose between an image type or any binary type. JDL lets you do the same: just create a custom type (see DataType) with the editor, name it according to these conventions:
AnyBlob
or justBlob
to create a field of the “any” binary type;ImageBlob
to create a field meant to be an image.
And you can create as many DataTypes as you like.
Commenting & Javadoc
It is possible to add Javadoc & comments to JDL files.
Just like in Java, this example demonstrates how to add Javadoc comments:
These comments will later be added as Javadoc comments by JHipster.
JDL possesses its own kind of comment:
Therefore, anything that starts with //
is considered an internal comment for JDL, and will not be counted as Javadoc.
Jdl Driver Download Software
Using JHipster’s options
JDL can add options to your entities (DTOs, paginations and services).
The keywords dto
, paginate
, service
and with
were added to the grammar to support these changes.If a wrong option is specified, JDL will inform you of that with a nice, red message and will just ignore it so as not to corrupt JHipster’s JSON files.
JDL also supports mass-option setting. it is possible to do:
Note that *
and all
are equivalent.Latest version introduces exclusions (which is quite a powerful option when setting options for every entity):
All the relationships
Explanation on how to create relationships with JDL.
One-to-One
A bidirectional relationship where the Car has a Driver, and the Driver has a Car.
A Unidirectional example where a Citizen has a Passport, but the Passport has no access to sole its owner.
One-to-Many
A bidirectional relationship where the Owner has none, one or more Car objects, and the Car knows its owner.
Unidirectional versions for this relationship are not supported by JHipster, but it would look like this:
Many-to-One
The reciprocal version of One-to-Many relationships is the same as previously.The unidirectional version where the Car knows its owners:
Many-to-Many
Finally, in this example we have the Car that knows of its drivers, and the Driver object can access its cars.
Please note that the owning side of the relationship has to be on the left side
Here is the types supported by JDL:
Jbl Driver Download For Windows 10
SQL | MongoDB | Cassandra | Validations |
---|---|---|---|
String | String | String | required, minlength, maxlength, pattern |
Integer | Integer | Integer | required, min, max |
Long | Long | Long | required, min, max |
BigDecimal | BigDecimal | BigDecimal | required, min, max |
Float | Float | Float | required, min, max |
Double | Double | Double | required, min, max |
Enum | Enum | required | |
Boolean | Boolean | Boolean | required |
LocalDate | LocalDate | required | |
Date | required | ||
ZonedDateTime | ZonedDateTime | required | |
UUID | required | ||
Blob | Blob | required, minbytes, maxbytes | |
AnyBlob | AnyBlob | required, minbytes, maxbytes | |
ImageBlob | ImageBlob | required, minbytes, maxbytes |
JDL is available on Github, and follows the same contributing guidelines as JHipster.
Please use our project for submitting issues and Pull Requests concerning the library itself.
When submitting anything, you must be as precise as possible: - One posted issue must only have one problem (or one demand/question); - Pull requests are welcome, but the commits must be ‘atomic’ to really be understandable.
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