Yes. In the deployment specific orion-ejb-jar.xml file, you can specify a default data source to sue the entity bean. Yes. This can be done by implementing the "public boolean isModified()" method in your bean class. If isModified returns false the EJB container will not persist the fields in the database. This is particularly useful when methods are being invoked on the EJB that do not modify the state of the entity.

You can set the DataSource for the CMP entity bean at the entity bean level in AAT, or set a default DataSource for the entire EJB module. If a CMP entity bean does not have any DataSource specified, it will use the default DataSource. However, the DataSource name specified at the CMP Entity bean level overrides the default DataSource name. The DataSource name must be the JNDI name of the JDBC DataSource set in the admin console.

It doesn't. Entity beans do not employ JTA transactions; that is, entity beans always employ declarative, container-managed transaction demarcation. Is it necessary for an entity bean to protect itself against concurrent access from multiple transactions? No. One of the motivations for using a distributed component architecture such as Enterprise JavaBeans is to free the business logic programmer from the burdens that arise in multiprogramming scenarios.

EJB, by default, prohibits concurrent access to bean instances. In other words, several clients can be connected to one EJB object, but only one client thread can access the bean instance at a time. If, for example, one of the clients invokes a method on the EJB object, no other client can access that bean instance until the method invocation is complete. This design reflects the common "Factory" Design pattern. The EJBHome interface is the Factory that creates EJBObjects.

Yes. The entity bean can be mapped to an existing relational database table. To achieve this, you must indicate to the EJB container what table to use for the entity bean. This is done in the deployment specific orion-ejb-jar.xml file. Additionally, you can also map the fields of the entity bean to columns with different names in the table. This deployment information is also provided in the orion-ejb-jar.xml file.

The default DataSource used depends on where the DataSource is specified. You can specify the default DataSource in one of the following XML files. Set the data source attribute on the <entity-deployment> element in the orion-ejb-jar.xml file for the entity bean. Set the default-datasource attribute in the <orion-application> element in the orion-application.xml file that is specific to the application (within the EAR structure).

Yes. DB Mapper can used by an application programmer as a persistence mechanism for BMP (bean managed persistence) entity beans. See user guide "EJB Example" for more details. On the other hand, DB Mapper can be used by an EJB container vendor as a persistence mechanism for CMP (container managed persistence) entity beans.

No. The guidelines are completely voluntary. They are not a new standard or regulation and do not create any new OSHA duties. Under the OSH Act, the extent of an employer's obligation to address ergonomic hazards is governed by the general duty clause, which requires employers to provide their employees with a workplace free from recognized hazards likely to cause death or serious physical harm.

Add these two attributes to the <orion-application ...> element at the top of the orion-application.xml file: Deploy your bean by adding an <ejb-module ... /> element to this same file. Once it's deployed, go to Configure the data source in your data-source.xml file. Specify an ejb-location. You must add a resource-ref to that location in your ejb-jar.xml file, in the following form:

For many years, the amount of printing on campus has been significantly increasing. This is attributed in a large part to the success of the Blackboard system on campus. Labs on campus can no longer absorb these increases without sacrificing core services or postponing the replacement of lab computers. This would dramatically affect the computing environment and could contribute to a negative computing experience for students.

Start off by examining either the Simple Interface example for LabVIEW or LabWindows/CVI. They are contained in the TestStand\Examples\Operator Interfaces directory. These interfaces communicate with the TestStand engine through ActiveX automation. The Engine's automation Interface properties and methods are all documented in the ActiveX API on-line help. Properties and methods pertinent to creating an operator interface are under the Advanced section of the property and method tree.

Ans: Life cycle management is a service that one must take from application server for the EJB components. That's why the programmer will never define any method related to life cycle management of the EJBs. But then he/she has to declare those methods and let the ejb container implement the same. Home interface is used for declaring such methods. Ex: crate, find, remove etc. The reason that we need to declare these methods is to specify the list of input and output parameters.

A Bean is a reusable Java class which can be combined with other beans to form an application. JavaBeans are lightweight Java objects with methods (getter/setter) for accessible attribute. EJBs Enterprise JavaBeans are heavyweight Java components that adhere to the J2EE specification.

A health plan, health care clearinghouse or health care provider who maintains and transmits any health information.

Although change occurs continuously in the world and in our daily lives it is rarely implemented that way in organisations but rather as a series of steps; a ladder of change. A new piece of legislation, market imperatives, management initiatives and new technology create projects that need to be managed, often across departmental or disciplinary lines.

To create a statefull session bean you need to make use of the @Statefull annotation. You place the annotation on the line before the class declaration....

To create a stateless session bean you need to make use of the @Stateless annotation. You place the annotation on the line before the class declaration....

The four basic steps in creating an escape plan for your home includes: drawing a floor-plan of your home; agreeing on a meeting place; practicing your escape plan; and making sure your exit drill is realistic. For more information on Exit Drills in the Home click here or visit your local fire station .

All you need is a programming language that supports tcp/ip and can send tcp/ip or HTTP requests over the internet. For example, you could use any one of these web scripting languages: PHP, ASP, Java, ColdFusion, or Perl.

RTDB systems come complete with excellent graphical user interfaces. These GUI's allow sites to create custom displays of their data. However, this data is largely limited to 'view-only' of the measurement data stored within the RTDB. Some RTDB GUI's now allow access to data stored in relational databases via ODBC connections, but this is always 'read-only'. The relational database required to complement the RTDB system is not going to contain static data.