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In this chapter, we explained how to integrate Hibernate into your Java application. We also detailed the configuration options for Hibernate, including the available Hibernate property settings. We recommended using the hibernate.cfg.xml XML configuration for Hibernate because it offers the ability to configure mapping files instead of configuring the mapping files in Java code. Naming strategies allow you to create a consistent company or application-wide database table-naming convention, and they also give you the ability to easily map your Hibernate classes to databases with existing naming conventions. Hibernate uses dialects to define different behaviors for different databases each database has its own feature set and SQL compatibility quirks, and Hibernate provides built-in support for most common relational databases. In the next chapter, we build and examine a sample Hibernate application that illustrates the core Hibernate concepts.

One or more ordered entity listener classes can be defined in an @EntityListeners annotation on an entity or mapped superclass (refer to 11). When a lifecycle event fires, the listeners that have methods for the event will get invoked in the order in which they are listed. The entity-listeners element can be specified as a subelement of an entity or mapped-superclass element to accomplish exactly the same thing. It will also have the effect of overriding the entity listeners defined in an @EntityListeners annotation with the ones defined in the entity-listeners element. An entity-listeners element includes a list of ordered entity-listener subelements, each of which defines an entity-listener class in its class attribute. For each listener, the methods corresponding to lifecycle events must be indicated as subelement events. The events can be one or more of pre-persist, post-persist, pre-update, post-update, pre-remove, post-remove, and post-load,

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Using SimpleFormController A typical web application involves displaying a form to collect user input. The users fill in this form and submit the data to the web server for further processing. SimpleFormController is widely used to provide page controller implementations because it coordinates and manages the two most important aspects of a form s life cycle view and submission. As with many other Spring MVC classes, this one also implements the template design pattern and is closed for modification but open for extension at suitable points of the workflow. The workflow can also be altered by setting various configurable properties. Form Display I will first look at the form display feature provided by the SimpleFormController class. Figure 3-10 shows the workflow of this function.

which correspond to the @PrePersist, @PostPersist, @PreUpdate, @PostUpdate, @PreRemove, @PostRemove, and @PostLoad annotations, respectively. Each of the event subelements has a method-name attribute that names the method to be invoked when its lifecycle event is triggered. The same method can be supplied for multiple events, but no more than one event of the same type can be specified on a single listener class. The entity-listeners element can be used to disable all the entity listeners defined on a class or just add an additional listener. Disabling listeners is not recommended, of course, because listeners defined on a class tend to be fairly coupled to the class itself, and disabling them might introduce bugs into either the class or the system as a whole. Listing 12-35 shows that the XML mapping file is overriding the entity listeners on the Employee class. It is keeping the existing ones, but also adding one more at the end of the order to notify the IT department to remove an employee s user accounts when he or she leaves the company. Listing 12-35. Overriding Entity Listeners @Entity @EntityListeners({ EmployeeAuditListener.class, NameValidator.class }) public class Employee { ... } public class EmployeeAuditListener { @PostPersist public void employeeCreated(Employee emp) { ... } @PostUpdate public void employeeUpdated(Employee emp) { ... } @PostRemove public void employeeRemoved(Employee emp) { ... } } public class NameValidator { @PrePersist public void validateName(Employee emp) { ... } } public class EmployeeExitListener { public void notifyIT(Employee emp) { ... } } orm.xml snippet: <entity class="examples.model.Employee"> ... <entity-listeners> <entity-listener class="examples.listeners.EmployeeAuditListener"> <post-persist method-name="employeeCreated"/> <post-update method-name="employeeUpdated"/> <post-remove method-name="employeeRemoved"/> </entity-listener> <entity-listener class="examples.listeners.NameValidator"> <pre-persist method-name="validateName"/> </entity-listener> <entity-listener class="examples.listeners.EmployeeExitListener"> <post-remove method-name="notifyIT"/> </entity-listener> </entity-listeners> ... </entity>

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