Appian Annotations - 1

 

Q) What do you understand by Artifacts ?

Ans) Artifacts allow process designers to extend the basic BPMN notation to include additional information about the process in the process diagram. There are three types of artifacts: dataobject, group, and annotation.

Q)What do you understand by Annotations ?

Ans) Annotations can be used to add textual comments within a process diagram.

Q) What is JPA in Appian ?

Ans) Java Persistence API (JPA) is the Java standard for mapping Java objects to relational databases. Since Appian BPM built on the Java platform we can use JPA annotations.

Q) What is Appian annotation ?

Ans) Your custom data types can use JPA annotations in the XSD to map types and their fields to tables and columns within a database. Many of the supported JPA annotations are automatically added for you when creating a CDT from a database table or when defining CDT relationships in the data type designer.

JPA Annotations :-

JPA annotations are used in mapping java objects to the database tables, columns etc. Today we will look into Appian supported JPA annotations.

When used with Data Stores, a custom data type (CDT) can be used to map data to a relational database. Your custom data types can use JPA annotations in the XSD (XML Schema Definition) to map types and their fields to tables and columns within a database.

Many of the supported JPA annotations are automatically added for you when creating a custom data type (CDT) from a database table or when defining CDT relationships in the data type designer. Should you need to add additional JPA (Java Persistence API) annotations to your XSD (XML Schema Definition), this section contains the list of all Appian supported annotations.

The following annotations are supported:

1) @AssociationOverride

The @AssociationOverride annotation is used to override an association mapping (e.g.  @ManyToOne, @OneToOne, @OneToMany, @ManyToMany) inherited from a mapped superclass or an embeddable.

2) @AssociationOverrides

The @AssociationOverrides is used to group several @AssociationOverride annotations.

3) @AttributeOverride

The @AttributeOverride annotation is used to override an attribute mapping inherited from a mapped superclass or an embeddable.

4) @AttributeOverrides

The @AttributeOverrides is used to group several @AttributeOverride annotations.

5) @Basic

The @Basic annotation is used to map a basic attribute type to a database column.

6) @Column

The @Column annotation is used to specify the mapping between a basic entity attribute and the database table column.

7) @DiscriminatorColumn

The @DiscriminatorColumn annotation is used to specify the discriminator column name and the discriminator type for the SINGLE_TABLE and JOINED Inheritance strategies. (a DiscriminatorColumn can have a Column attribute to define an index, or another attribute such as length)

8) @DiscriminatorValue

The @DiscriminatorValue annotation is used to specify what value of the discriminator column is used for mapping the currently annotated entity.

9) @Enumerated

The @Enumerated annotation is used to specify that an entity attribute represents an enumerated type.

10) @GeneratedValue

The @GeneratedValue annotation specifies that the entity identifier value is automatically generated using an identity column, a database sequence, or a table generator. Hibernate supports the @GeneratedValue mapping even for UUIDidentifiers.

11) @Id

The @Id annotation specifies the entity identifier. An entity must always have an identifier attribute, which is used when loading the entity in a given Persistence Context.

12) @IdClass

The @IdClass annotation is used if the current entity defined a composite identifier. A separate class encapsulates all the identifier attributes, which are mirrored by the current entity mapping.

13) @Inheritance

The @Inheritance annotation is used to specify the inheritance strategy of a given entity class hierarchy.

14) @JoinColumn

The @JoinColumn annotation is used to specify the FOREIGN KEY column used when joining an entity association or an embeddable collection.

15) @JoinColumns

The @JoinColumns annotation is used to group multiple @JoinColumn annotations, which are used when mapping entity association or an embeddable collection using a composite identifier.

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Source  : https://docs.appian.com/suite/help/22.2/Supported_XSD_Elements_and_JPA_Annotations.html