EJB data mediator service data retrieval

An EJB mediator request is a compound EJB query. We can obtain a DataGraph using the getGraph call.

Directly from the data source

To retrieve data directly from the data source, specify the first EJB query to reference the Abstract Schema Name (ASN) of the enterprise bean.

From the EJB container

To retrieve data through the EJB container, specify the first query to use an input parameter in the FROM clause referring to the EJB collection desired.

You should use this method when there is high likelihood that the EJB instances will be cached in the container. This way you avoid container flush and then read from the database to retrieve data.

For an example, see the topic Using the EJB data mediator service for data access.

Related tasks

Use the EJB data mediator service for data access

EJB data mediator service programming considerations

EJB data mediator service data update

EJB mediator query syntax

DataGraph schema