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JP QL supports two types of parameter binding syntax. The first is positional binding, where parameters are indicated in the query string by a question mark followed by the parameter number. When the query is executed, the developer specifies the parameter number that should be replaced. Listing 7-5 demonstrates positional parameter syntax. Listing 7-5. Positional Parameter Notation SELECT e FROM Employee e WHERE e.department = 1 AND e.salary > 2 Named parameters may also be used and are indicated in the query string by a colon followed by the parameter name. When the query is executed, the developer specifies the parameter name that should be replaced. Listing 7-6 demonstrates named parameter syntax. Listing 7-6. Named Parameter Notation SELECT e FROM Employee e WHERE e.department = :dept AND e.salary > :base

The isolation levels permitted by JDBC and Hibernate are listed in Table 9-2. Table 9-2. JDBC Isolation levels

duplicates in memory after the results have been fetched. This could have performance implications for large result sets. Given the somewhat peculiar results generated from a fetch join to a collection, it might not be the most appropriate way to eagerly load related entities in all cases. If a collection requires eager fetching on a regular basis, consider making the relationship eager by default. Some persistence providers also offer batch reads as an alternative to fetch joins that issue multiple queries in a single batch and then correlate the results to eagerly load relationships.

public class PolicyQuoteClient { public static void main(String[] args) throws ServiceException, AxisFault { accessViaSpringClient(); accessViaNonSpringClient(); } } public static void accessViaSpringClient() { String configFile = "com/xpress/channel/springws-config.xml"; ApplicationContext ctx = new ClassPathXmlApplicationContext(configFile); PolicyQuoteBusinessDelegate delegate = (PolicyQuoteBusinessDelegate) ctx.getBean("policyQuoteDelegate"); delegate.execute(); }

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The WHERE clause of a query is used to specify filtering conditions to reduce the result set. In this section, we will explore the features of the WHERE clause and the types of expressions that can be formed to filter query results. The definition of the WHERE clause is deceptively simple. It is simply the keyword WHERE, followed by a conditional expression. However, as the following sections demonstrate, JP QL supports a powerful set of conditional expressions to filter the most sophisticated of queries.

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public static void accessViaNonSpringClient() { try { URL url = new URL("http://localhost:7001/eInsureWeb/axis/ PolicyQuoteService"); Service service = new Service(); Call call = (Call) service.createCall(); call.setTargetEndpointAddress(url); call.invoke("calculatePolicyQuote", new Object[]{"ff",1,2.5,4}); } catch (MalformedURLException ex) { throw new RuntimeException(ex); } }

Input parameters for queries can be specified using either positional or named notation. Positional notation is defined by prefixing the variable number with a question mark. Consider the following query: SELECT e FROM Employee e WHERE e.salary > 1 Using the Query interface, any double value, or value that is type-compatible with the salary attribute, can be bound into the first parameter in order to indicate the lower limit for employee salaries in this query. The same positional parameter can occur more than once in the query. The value bound into the parameter will be substituted for each of its occurrences. Named parameters are specified using a colon followed by an identifier. Here is the same query, this time using a named parameter: SELECT e FROM Employee e WHERE e.salary > :sal Input parameters were covered in detail in 7.

Much of the conditional expression support in JP QL is borrowed directly from SQL. This is intentional and helps to ease the transition for developers already familiar with SQL. The key difference between conditional expressions in JP QL and SQL is that JP QL expressions can leverage identification variables and path expressions to navigate relationships during expression evaluation. Conditional expressions are constructed in the same style as SQL conditional expressions, using a combination of logical operators, comparison expressions, primitive and function operations on fields, and so on. Although a summary of the operators is provided later, the grammar for conditional expressions is not repeated here. The JPA specification contains the grammar in Backus-Naur form (BNF) and is the place to look for the exact rules about using basic expressions. The following sections

Remoting with Burlap Spring provides some alternative remoting strategies for exposing services over HTTP. One such alternative is its support for the Burlap and Hessian remoting protocols from Caucho. Hessian supports binary data exchange over HTTP. I will concentrate on Burlap, which allows simple text and XML-based data transfer. It is just a matter of configuration to export a Spring service for access through the Burlap protocol. To do that, I will need to ensure that the dispatcher servlet handles Burlap remoting. This requires some alteration in the web application configuration file, as shown in Listing 5-38.

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