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Figure 9-2. Metamodel interfaces To further expand on this example, consider a tool that inspects a persistent unit and prints out summary information to the console. To enumerate all of the attributes and their types, we could use the following code: public <T> void listAttributes(EntityType<T> type) { for (Attribute< super T, > attr : type.getAttributes()) {

We recommend that a standard for pluralization of table names be selected. We prefer the singular Tip form thus the Order and Catalog tables, rather than Orders and Catalogs but it does not matter much. The point is that all tables should have the same form, which in turn ensures that your programmers will not have to keep cross-referencing the schema design when constructing SQL queries and modifying mapping files.

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later in the section Bulk Update and Delete Note that both of the query interfaces define the same set of methods and differ only in their return types We will cover this issue in the next section The simplest form of query execution is via the getResultList() method It returns a collection containing the query results If the query did not return any data, the collection is empty The return type is specified as a List instead of a Collection in order to support queries that specify a sort order If the query uses the ORDER BY clause to specify a sort order, the results will be put into the result list in the same order.

< xml version="1.0" encoding="UTF-8" > <!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd"> <beans> <! Other beans --> <bean id="exceptionTranslationFilter" class="org.springframework.security.ui.ExceptionTranslationFilter"> <property name="authenticationEntryPoint" ref="authenticationEntryPoint" /> <property name="accessDeniedHandler" ref="accessDeniedHandler" />

Listing 7-14 demonstrates how a query might be used to generate a menu for a command-line application that displays the name of each employee working on a project as well as the name of the department that the employee is assigned to The results are sorted by the name of the employee Queries are unordered by default Listing 7-14 Iterating over Sorted Results public void displayProjectEmployees(String projectName) { List<Employee> result = emcreateQuery( "SELECT e " + "FROM Project p JOIN pemployees e "+ "WHERE pname = 1 " + "ORDER BY ename", Employeeclass) setParameter(1, projectName) getResultList(); int count = 0; for (Employee e : result) { Systemoutprintln(++count + ": " + egetName() + ", " + egetDepartment()getName()); } } The getSingleResult() method is provided as a convenience for queries that return only a single value.

The aim of the mapping file generated schema is simply to provide you with a point of comparison against the manually generated file. As you compare the two schemas, you will almost always find disparities between them. When the disparities are in the names of the objects, you should prefer your manually generated names. However, when they are in the structures of the objects (a missing foreign key, a missing table, etc.), this can indicate several scenarios: You may have made a mistake in your manual schema design. You may have made a mistake in your mapping file specification. You may have made a mistake in your class design. The first scenario is fairly benign (but it helps indicate which parts of the schema may need more documentation for unwary developers). The latter pair, however, must be remedied immediately. In Listing 10-5, we show a generated schema that has been through these iterations and is now correct. Listing 10-5. A Typical (Generated) Schema to Represent the Catalog Entity create table catalog ( id int4 not null, description varchar(255) not null,

Instead of iterating to the first result in a collection, the object is directly returned It is important to note, however, that getSingleResult() behaves differently from getResultList() in how it handles unexpected results Whereas getResultList() returns an empty collection when no results are available, getSingleResult() throws a NoResultException exception Therefore if there is a chance that the desired result may not be found, then this exception needs to be handled If multiple results are available after executing the query instead of the single expected result, getSingleResult() will throw a NonUniqueResultException exception Again, this can be problematic for application code if the query criteria may result in more than one row being returned in certain circumstances Although getSingleResult() is convenient to use, be sure that the query and its possible results are well understood, otherwise application code may have to deal with an unexpected runtime exception.

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