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Now that the DataBinder instance is ready, you have the choice of performing a binding using any parameters sent with this initial HTTP GET request This action is determined by the bindOnNewForm property, enabled by (you guessed it) calling the setBindOnNewForm() method Typically, on the first view of a form, no parameters have been sent with the request, so it is safe to leave bindOnNewForm equal to false (the default) However, if you set the property to true, and any errors occurred from the binding process, those errors will be available to the initial form view The SimpleFormController has the ability to store the form object in the session for the duration of the controller s work flow That is, the form will live in the session between the initial form view and the form submission To enable this feature, simply call setSessionForm() with a value of true.

</cmp-field> <cmp-field> <field-name>avgVolume</field-name> Declares the primary </cmp-field> key field of the bean <primkey-field>symbol</primkey-field> </entity> <!-- =========[ ContainerManaged Bean ]======== --> </enterprise-beans> <assembly-descriptor> </assembly-descriptor> </ejb-jar>

If the script did not use the -e switch, it would not format the output properly, instead printing the escape sequences along with the usage information. User-supplied options are accessed through an argument vector, or what you may think of as an array. The getopts utility uses the OPTIND environment variable to index this array. Each time the example code function is invoked, the variable needs to be reset to 1 before option processing starts in order to point at the beginning of the options that have been passed.

Once the form object has been created, and after it is possibly bound by the DataBinder, it will be stored in the session if this property is true If you load the form bean from persistence using an object-relational mapping (ORM) tool, you may find the session form functionality useful Many ORM tools support the concept of reattaching, or merging, a detached bean back into persistence If you require this type of behavior, using the session form functionality is a nice way to load the form bean only once during initial form view That same instance will then be used during the form submission stage, avoiding the need to pull the instance from persistence again Most persistence strategies can handle pulling the instance twice (once on form view and once on form submission), so weigh the pros with the cons of increased memory usage for the session, among other issues..

As you can see in the EquityBean example, the source for a CMP bean is noticeably different from that of a BMP bean First of all, the methods will not contain any persistence code, like JDBC connections or SQL statements Also, a CMP entity bean has a much more descriptive deployment descriptor than a BMP entity bean However, like a BMP bean, it must declare its persistence type In this case, it should be declared Container Similarly, the deployment descriptor should also tell the container to use the EJB 20 specification (which is what this recipe describes) After declaring the bean to be a 20 CMP entity bean, you should describe the persistent fields and schema used by the bean Indicate each field that will be persisted with a <cmp-field/> tag.

As the while loop in the following code snippet iterates through the passed options, the getopts utility increments the value of the OPTIND variable and processes through any parameters that were passed. This while loop is the core of the script. It is where the passed parameters are processed and appropriate actions are taken.

Caution Storing the form in the session should not be chosen lightly if the application is to be clustered.

The EJB container will generate a concrete subclass of your abstract bean that implements the abstract methods to actually perform the persistence and loading of the bean data as needed The schema and persistent fields are mapped to an actual database table in a vendor-specific manner, usually with a vendor deployment descriptor for the bean Check your vendor s documentation for more information on what you need to do Typically, application servers require you to provide an additional XML descriptor file For example, Weblogic requires you to build two files: weblogic-ejb-jarxml and weblogic-cmp-rdbms-jarxml Lastly, you should declare which persistent field is the primary key for this entity bean When using entity beans in your application, you should always encapsulate access to them through a session bean Not only does this separate your clients from the data layer, but it lets you provide better security, transaction management, and performance.

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