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EJB data mediator service data retrieval

 

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

 

Directly from the data source

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

 

From the EJB container

To retrieve data through the EJB container, specify your 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 your 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 section called Collection Input Parameter at Example: Using query arguments with EJB mediator .


 

Related tasks


Use the Enterprise JavaBeans data mediator service for data access

 

Related Reference


EJB data mediator service programming considerations
EJB data mediator service data update
EJB mediator query syntax
DataGraph schema

 

Reference topic