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In this chapter, we took a more in-depth look at various ways of mapping collections to the database. We looked at how the contents of the collection determine how it is mapped, and noted that there are many flexible options for storing different kinds of objects in various types of collections. We showed that the difference between relationships and element collections was whether entities or basic/embeddable types were being stored in them. We went on to examine the different types of collections, and how Collection and Set can be used for simple container purposes, while List can be used to maintain ordered collections. We saw that there are two different approaches to using a List and that maintaining a persistent List is possible, but not usually the best strategy. We then elaborated on all the Map types, explaining how combinations of basic, embeddable, and entity types can be used as keys and values. We experimented with and showed examples of using many of the different combinations of key and value types, illustrating how each changed the way the collection was mapped. We then outlined, in list form, the basic rules of using a Map type. We finished off collections by looking at the corner cases of adding duplicates and null values to collections and outlined the cases when support might be reasonable. Some best practices and practical guidance to using collections followed. The next chapter will discuss using entity managers and persistence contexts in more advanced ways than we did previously, delving into the practices and nuances of injecting and using them in Java EE and Java SE environments.

< xml version="1.0" encoding="UTF-8" > <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd"> <bean id="uwrApplicationService" class="com.apress.einsure.business.impl. UnderwritingApplicationServiceImpl"> <property name="policyDetailDao" ref="policyDetailDao"/> </bean> <bean id="policyDetailDao" class="com.apress.einusre.persistence.dao.impl.PolicyDetailDaoImpl" > <property name="dataSource" ref="datasource"/> </bean>

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Entities do not persist themselves when they are created. Nor do they remove themselves from the database when they are garbage-collected. It is the logic of the application that must manipulate entities to manage their persistent lifecycle. JPA provides the EntityManager interface for this purpose in order to let applications manage and search for entities in the relational database. At first, this might seem like a limitation of JPA. If the persistence runtime knows which objects are persistent, why should the application have to be involved in the process Rest assured that this design is both deliberate and far more beneficial to the application than any transparent persistence solution. Persistence is a partnership between the application and persistence provider. JPA brings a level of control and flexibility that could not be achieved without the active participation of the application. In 2 we introduced the EntityManager interface and described some of the basic operations that it provides for operating on entities. We extended that discussion in 3 to include an overview of the Java EE environment and the types of services that impact persistence applications. Finally, in s 4 and 5 we described object-relational mapping, the key to building entities out of objects. With that groundwork in place we are ready to revisit entity managers, persistence contexts, and persistence units, and to begin a more in-depth discussion of these concepts.

Another style of searching is Query By Example (QBE) Instead of programmatically building a Criteria object with Criterion objects and logical expressions, you can partially populate an instance of the object Use the instance as an example and have Hibernate build the criteria for you behind the scenes This keeps your code clean, and makes your project easier to test The orghibernatecriterionExample class contains the QBE functionality The Example class implements the Criterion interface, so you can use it like any other restriction For instance, if we had a user database we could construct an instance of a user object, set the property values for type and creation date, and then use the criteria query API to run a QBE query Hibernate would return a result set containing all user objects that matched the property values that were set.

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