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The second fundamental concept we need to revisit is the path expression The path expression is the key to the power and flexibility of the JP QL language, and it is likewise a central piece of the criteria API We discussed path expressions in detail in 8 so if you feel you need a refresher we recommend going back to review that section We went over query roots in the previous section, and roots are actually just a special type of path expression Query roots in hand, we can now look at how to obtain and extend path expressions Consider the following basic JP QL query, which returns all the employees living in New York City: SELECT e FROM Employee e WHERE eaddresscity = 'New York' Thinking in terms of the criteria API, the query root for this expression is the Employee entity.

This query also contains a path expression in the WHERE clause To represent this path expression using the criteria API, we would use the following expression: empget("address")get("city") The emp object in this example corresponds to the query root for Employee The get() method is derived from the Path interface extended by the Root interface and is equivalent to the dot operator used in JP QL path expressions to navigate along a path Because the get() method returns a Path object, the method calls can be chained together, avoiding the unnecessary declaration of intermediate local variables The argument to get() is the name of the attribute we are interested in Because the result of constructing a path expression is an Expression object that we can use to build conditional expressions, we can then express the complete query as follows: CriteriaQuery<Employee> c = cbcreateQuery(Employeeclass); Root<Employee> emp = c.

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As our first step in the design process, we need to specify the requirements incumbent upon our order server. Our design is focused upon the persistence layer of the order server, rather than the entire application, so we will express the requirements in terms of the operations that are offered to client code. Client code should be able to do the following: Add a product to the catalog Remove a product from the catalog Amend a product in the catalog List the products in the catalog Set the price of a product in the catalog Amend the price of a product in the catalog Specify the stock of a product Determine the stock of a product

< 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="authenticationProcessingFilter" class="org.springframework.security.ui. webapp.AuthenticationProcessingFilter"> <property name="authenticationManager" ref="authenticationManager"/> <property name="authenticationFailureUrl" value="/login.do errorId=1"/> <property name="defaultTargetUrl" value="/secure/app/createPolicy.do"/> <property name="filterProcessesUrl" value="/j_spring_security_check"/> </bean> </beans>

from(Employeeclass); cselect(emp) where(cbequal(empget("address")get("city"), "New York")); Much like JP QL, path expressions may be used throughout the different clauses of the query definition With the criteria API it is necessary to hold onto the root object in a local variable and use it to form path expressions where required Once again it is worth emphasizing that the from() method of AbstractQuery should never be invoked more than once for each desired root Invoking it multiple times will result in additional roots being created and a Cartesian product if not careful Always store the root objects locally and refer to them when necessary..

There are several forms that the SELECT clause of a query may take. The simplest form involves a single expression, while others involve multiple expressions or the use of a constructor expression to create new object instances. Each form is expressed differently in the criteria API.

The first decision that APF needs to make is whether the incoming request needs authentication. For this it depends on the property filterProcessesUrl. APF will extract the URI using the HttpServletRequest.getRequestURI method. In this case, the method returns /eInsureWeb/j_spring_security_check. This returned value is then compared to the context root and filterProcessUrl combination to determine whether this URL has to be processed for authentication. You may want to customize the names of the two text fields in Listing 6-5. I have used the default values. To use custom values, you will need to configure the properties passwordParameter and usernameParameter of the authentication processing filter. Now, in the scenario under consideration, the APF determines that the incoming request does need authentication. So, it will attempt to carry out the actual authentication. For this it will use the authenticationManager property. The authentication managers are pluggable helpers that carry out the actual authentication; they implement the AuthenticationManager interface. This interface defines a single method named authenticate. This method accepts an Authentication object containing the user s

For a Hibernate persistence layer, our object model will consist primarily of the POJOs to be persisted into and retrieved from the database, and the DAOs through which this will be achieved.

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