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Using these restrictions, we can build a where clause in HQL that is as powerful as an SQL query. For many queries, HQL syntax is more compact and elegant than the criteria query API syntax. For instance, here is an example of a criteria query that uses logical expressions: Criteria crit = session.createCriteria(Product.class); Criterion price = Restrictions.gt("price",new Double(25.0)); Criterion name = Restrictions.like("name","Mou%"); LogicalExpression orExp = Restrictions.or(price,name); crit.add(orExp); crit.add(Restrictions.ilike("description","blocks%")); List results = crit.list(); The equivalent HQL would be the following: from Product where price > 25.0 and name like 'Mou%' We would have to wrap that HQL in a few Java calls, but we find this particular example to be clearer in HQL. In the previous HQL example, you can see that we used the where clause with a greater than comparison operator, an and logical operator, and the like comparison operator. You do have to enclose literal strings in quotes in HQL, and to find names that have the literal 'Mou' at the beginning of the string, we used % in the query.

With three different entity manager types, each with a different lifecycle and different rules about transaction association and propagation, it can all be a little overwhelming. What style is right for your application Application-managed or container-managed Transaction-scoped or extended Generally speaking, we believe that container-managed, transaction-scoped entity managers are the best model for most applications. This is the design that originally inspired JPA and is the model that commercial persistence providers have been using for years. The selection of this style to be the default for Java EE applications was no accident. It offers the best combination of flexible transaction propagation with easy-to-understand semantics. Container-managed, extended persistence contexts offer a different programming model, with entities remaining managed after commit, but they are tied to the lifecycle of a Java EE component in this case, the stateful session bean. There are some interesting new techniques possible with the extended persistence context (some of which we will describe later in this chapter), but they might not apply to all applications. In most enterprise applications, application-managed entity managers are unlikely to see much use. There is rarely a need for persistence contexts that are not associated with a container transaction and that remain isolated from the rest of the container-managed persistence contexts. The lack of propagation means that application-managed entity managers must be passed around as method arguments or stored in a shared object in order to share the persistence context. Evaluate application-managed entity managers based on your expected transactional needs, and the size and complexity of your application. More than anything, we recommend that you try to be consistent in how entity managers are selected and applied. Mixing all three entity manager types into an application is likely to be frustrating because the different entity manager types can intersect in unexpected ways.

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Like most enterprise applications, eInsure also had to support reports. Reports provide valuable insights into the state of the business. In eInsure, for example, there were reports to find out how many policies have been sold per product over a period, how many premium collections over a period of time, the number of new leads in the month of January, and so on. The contents and number of reports varied with the needs of the customer. eInsure supported two types of reports: scheduled and user generated. The scheduled reports were triggered by schedulers like Unix CRON after certain intervals. An example of a scheduled report is the monthly premium collection report. The usergenerated reports were triggered by the users of the eInsure application from their browser. A user would typically select a report, supply the necessary inputs, and start the report generation.

Armed with information about the different entity manager types and how they work with persistence contexts, we can now revisit the basic entity manager operations we introduced in 2 and reveal more of the details. The following sections describe the entity manager operations with respect to the different entity manager and persistence context types. Locking modes and the locking variants of the following operations will be discussed in 11.

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