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The IS EMPTY operator is the logical equivalent of IS NULL for collections. Queries can use the IS EMPTY operator or its negated form IS NOT EMPTY to check whether a collection association path resolves to an empty collection or has at least one value. For example, the following query returns all employees who are managers by virtue of having at least one direct report: SELECT e FROM Employee e WHERE e.directs IS NOT EMPTY Note that IS EMPTY expressions are translated to SQL as subquery expressions. The query translator can make use of an aggregate subquery or use the SQL EXISTS expression. Therefore the following query is equivalent to the previous one: SELECT m FROM Employee m WHERE (SELECT COUNT(e) FROM Employee e WHERE e.manager = m) > 0 The MEMBER OF operator and its negated form NOT MEMBER OF are a shorthand way of checking whether an entity is a member of a collection association path. The following query returns all managers who are incorrectly entered as reporting to themselves: SELECT e FROM Employee e WHERE e MEMBER OF e.directs A more typical use of the MEMBER OF operator is in conjunction with an input parameter. For example, the following query selects all employees who are assigned to a designated project: SELECT e FROM Employee e WHERE :project MEMBER OF e.projects Like the IS EMPTY expression, the MEMBER OF expression will be translated to SQL using either an EXISTS expression or the subquery form of the IN expression. The previous example is equivalent to the following query: SELECT e FROM Employee e WHERE :project IN (SELECT p FROM e.projects p)

The EXISTS condition returns true if a subquery returns any rows. Examples of EXISTS were demonstrated earlier in the introduction to subqueries. The EXISTS operator can also be negated with the NOT operator. The following query selects all employees who do not have a cell phone: SELECT e FROM Employee e WHERE NOT EXISTS (SELECT p FROM e.phones p WHERE p.type = 'Cell')

Now that I have exposed the policy quote service using Burlap remoting, it s time to focus on the client. Once more you will just need to configure a proxy factory bean, and that s more or less all there is to it, as shown in Listing 5-40.

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The ANY, ALL, and SOME operators can be used to compare an expression to the results of a subquery. Consider the following example: SELECT e FROM Employee e WHERE e.directs IS NOT EMPTY AND e.salary < ALL (SELECT d.salary FROM e.directs d) This query returns all the managers who are paid less than all the employees who work for them. The subquery is evaluated, and then each value of the subquery is compared to the left-hand expression, in this case the manager salary. When the ALL operator is used, the comparison between the left side of the equation and all subquery results must be true for the overall condition to be true. The ANY operator behaves similarly, but the overall condition is true as long as at least one of the comparisons between the expression and the subquery result is true. For example, if ANY were specified instead of ALL in the previous example, the result of the query would be all the managers who were paid less than at least one of their employees. The SOME operator is an alias for the ANY operator. There is symmetry between IN expressions and the ANY operator. Consider the following variation of the project department example used previously: SELECT e FROM Employee e WHERE e.department = ANY (SELECT DISTINCT d FROM Department d JOIN d.employees de JOIN de.projects p WHERE p.name LIKE 'QA%')

Note A surrogate key is a numeric integer value, with the data type depending on the number of objects

A scalar expression is a literal value, arithmetic sequence, function expression, type expression, or case expression that resolves to a single scalar value. It can be used in the SELECT clause to format projected fields in report queries or as part of conditional expressions in the WHERE or HAVING clause of a query. Subqueries that resolve to scalar values are also considered scalar expressions, but can be used only when composing criteria in the WHERE clause of a query. Subqueries can never be used in the SELECT clause.

< 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 name="policyQuoteDelegate" class="com.xpress.channel.PolicyQuoteBusinessDelegate" > <property name="service" ref="policyQuoteBurlapService" /> </bean> <bean id="policyQuoteBurlapService" class="org.springframework.remoting.caucho.BurlapProxyFactoryBean"> <property name="serviceUrl" value="http://localhost:7001/eInsureWeb/remoting/PolicyQuoteService"/> <property name="serviceInterface" value="com.apress.einsure.business.api.PolicyQuoteApplicationService"/> </bean> </beans>

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