Getting Started
Persistence Manager Factories
Persisting Data
Entity Annotations
Relationships
Indexing
Kotlin Query Builder
Query Change Listeners
Querying Entities
Partitioning
Lifecycle Events
Object Model Updates
Android NoSQL Database
Spring Configuration
Onyx Database Browser Overview

Attribute Annotation

The Attribute Annotation is used to specify non-transient fields that are serialized to the persisted record.

Attribute Type Default Description

nullable

 Boolean true Indicates whether an attribute can be null upon persisting the entity. This only applies to mutable attributes and not primitive.

size

 int -1 The maximum length of an attribute. This only applies to String attributes. If you specify -1, there is no constraint on String length.

The following are valid attribute types

Type Description Min/Max

String

 UTF-8 Encoded Text

Integer

 Mutable Integer(can be null) -2147483648 to 2147483647

int

 Immutable Integer(cannot be null) -2147483648 to 2147483647

Long

 Mutable Long(can be null) -9223372036854775808 to 9223372036854775807

long

 Immutable Long(cannot be null) -9223372036854775808 to 9223372036854775807

Double

 Mutable Double(can be null) 4.9E-324 to 1.7976931348623157E308

double

 Immutable Double(cannot be null) 4.9E-324 to 1.7976931348623157E308

Boolean

 Mutable Boolean(can be null) true/false

boolean

 Immutable Boolean(cannot be null) true/false

Date

 Java Date Time Sun Dec 02 16:47:04 GMT 292269055 - Sun Aug 17 07:12:55 GMT 292278994

Float

 Java Float primitive or mutable 2^149 to (2-2^23)ยท2^127

Byte

 Java Byte primitive or mutable -128 to 127

Short

 Java Short primitive or mutable -32,768 to 32,767

Managed Entity

 Define a managed entity as an attribute rather than a relationship. This is an option if you do not which to make a relational graph. null

List

 List of com.onyxdevtools.entities. This is different than defining a relationship. null

Enum

 Custom enum value. null
  1. Relationship Annotation