DataSource

A datasource is a logical representation of physical storage that is used to create, read, update and delete object instances.

Description

A datasource is a logical representation of physical storage that is used to create, read, update and delete object instances. Each class’ persistence mapping specifies how its instances will be persisted in a given datasource.

Currently supported datasource types include:

    * RelationalDatabase - persist instances in a relational database
    * FileStorage - persist instances in a file system
    * XML - persist instances in an XML file
    * Service - persist instances using a collection of services. e.g. web services or stored procedures.
    * Generic - for a custom developed persistence channel.

DataSources are configured and bound to physical storage addresses through connections, with which applications are deployed.

Datasources support a CRUD interface for interaction with external systems, whereas channels support a send/receive interface. The persistence interface for datasources is synchronous.

In NexJ Studio, datasources appear under the persistence tab of the repository navigator.

Properties

anyAttribute

Any attribute

create : boolean

True if instance creation is supported.

delete : boolean

True if instance deletion is supported.

description : string

Data source description.

execute : boolean

True if instance execution is supported.

join : boolean

Not supported.

Currently, joins are not supported across DataSources. When this feature is implemented, this value will be true if schema objects from this data source can be joined to objects from another data source.

read : boolean

True if instance retrieval is supported.

readLimit : nonNegativeInt

The maximum number of instances that can be returned by read() (0 for unlimited).

Valid values based on“int”.
0 (minInclusive)

type : string

Data source type.

update : boolean

True if instance updating is supported.

Content

Sequence of:
- any [1..1]
Sequence of:
- t_DataSource_Properties [0..1]

t_DataSource_Properties

Parent topic: references