Chapter 8. Developing Entity Beans
89
}
public void ejbPassivate() {
// Nothing to be done for this simple example.
}
public void ejbRemove() throws RemoveException {
// Nothing to be done for this simple example,
// in implicit persistence.
}
public void ejbStore() {
// Nothing to be done for this simple example,
// in implicit persistence.
}
public void setEntityContext(EntityContext ctx) {
// Keep the entity context in object
entityContext = ctx;
}
public void unsetEntityContext()
{
entityContext = null;
}
/**
* Business method to get the Account number
*/
public int getNumber()
{
return getAccno();
}
}
8.6. Writing Database Access Operations (Bean-Managed Persistence)
For
bean-managed persistence
, data access operations are developed by the bean provider
using the JDBC interface. However, getting database connections must be obtained through the
javax.sql.DataSource
interface on a datasource object provided by the EJB platform. This
is mandatory since the EJB platform is responsible for managing the connection pool and for
transaction management. Thus, to get a JDBC connection, in each method performing database
operations, the bean provider must:
•
Call the
getConnection(...)
method of the DataSource object to obtain a connection to perform
the JDBC operations in the current transactional context (if there are JDBC operations)
•
Call the
close()
method on this connection after the database access operations so that the con-
nection can be returned to the connection pool (and be dissociated from the potential current trans-
action).
A method that performs database access must always contain the getConnection and close statements,
as follows:
public void doSomethingInDB (...) {
conn = dataSource.getConnection();
... // Database access operations
Summary of Contents for Application Server
Page 1: ...Red Hat Application Server JOnAS User Guide ...
Page 8: ......
Page 22: ...14 Chapter 1 Java Open Application Server JOnAS a J2EE Platform ...
Page 58: ...50 Chapter 3 JOnAS Configuration ...
Page 66: ...58 Chapter 5 JOnAS Class Loader Hierarchy ...
Page 78: ...70 Chapter 6 JOnAS Command Reference ...
Page 80: ......
Page 86: ...78 Chapter 7 Developing Session Beans ...
Page 136: ...128 Chapter 9 Developing Message Driven Beans ...
Page 142: ...134 Chapter 10 Defining the Deployment Descriptor ...
Page 148: ...140 Chapter 11 Transactional Behavior of EJB Applications ...
Page 158: ...150 Chapter 14 EJB Packaging ...
Page 162: ...154 Chapter 15 Application Deployment and Installation Guide ...
Page 164: ......
Page 176: ...168 Chapter 18 WAR Packaging ...
Page 178: ......
Page 184: ...176 Chapter 20 Defining the Client Deployment Descriptor ...
Page 186: ...178 Chapter 21 Client Packaging ...
Page 188: ......
Page 192: ...184 Chapter 23 EAR Packaging ...
Page 194: ......
Page 200: ...192 Chapter 24 JOnAS Services ...
Page 204: ...196 Chapter 25 JOnAS and the Connector Architecture ...
Page 222: ...214 Chapter 27 Ant EJB Tasks Using EJB JAR ...
Page 234: ...226 Chapter 29 Web Services with JOnAS ...
Page 236: ......
Page 260: ...252 Chapter 34 How to use Axis in JOnAS ...
Page 270: ...262 Chapter 36 Web Service Interoperability between JOnAS and BEA WebLogic ...
Page 296: ......
