Other User Preferences in Java

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74 Other User Preferences
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So far, the user preferences page has dealt only with simple properties: the ones that do not involve the join tables The problem with the remaining properties is twofold: figuring out how to (1) display the user's current choices and (2) allow them to be changed The solutions to these problems will be different for sections and keywords because of the different ways this information will be used A good way to figure out how to tackle such problems is to solve first them in raw SQL Then the SQL can be moved into the bean Showing the list of sections the user has selected not to display is easy:
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select sectionname from section,user_sections where sectionsection_id = user_sectionssection_id and user_sectionuser_id =
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The question mark would get filled in with a sql:param from the current user Unfortunately, what is needed is the inverse of this: a list of all the sections that the user does want This could be done in three steps: (1) run the query, (2) run another query to get the list of all sections, and (3) remove the items in the first list from the second list in some Java code This would work, but as a general rule, it is worth trying to use as few queries as possible and to do as much work with those queries as possible This is partly for the sake of efficiency, as each query will take some time and impose some overhead on the database and the network In general, databases will also be able to manipulate data more efficiently than the equivalent Java code
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It turns out that it is possible to cook up a query that will do all the necessary work in one step This conceptually does the same thing that could be done manually in Java: Select the items from user_section, and remove the matching items from section:
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select * from section where section_id not in (select section_id from user_section where user_info_id = )
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The inner select, the one in parentheses, retrieves the list of sections that the user does not want; then the SQL keywords not in remove those sections from the outer select Now that the query has been designed, it will be put into the EditionBean as a new property: selectedSections This will alter the section list in the navigation as shown in Listing 75 Listing 75 The customized section list
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<%@ taglib prefix="c" uri="http://javasuncom/jstl/core" %>
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<jsp:useBean id="edition7" class="comawljspbookch07EditionBean" scope="session"/>
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<jsp:useBean id="currentSection" class="comawljspbookch07SectionBean"/>
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<jsp:setProperty name="currentSection" property="sectionId"/>
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<c:forEach items="${edition7selectedSections}" var="section">
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<c:if test="${currentSectionsectionId == sectionsectionId}">
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* </c:if>
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<a href="<c:url value="sectionjsp"> <c:param name="sectionId" value="${sectionsectionId}"/> </c:url>"><c:out value="${sectionname}"/></a><br> </c:forEach>
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One other point needs to be made about this example The query to get sections requires user_id as a parameter If the user has not yet logged in, no ID will be available, and the query will fail This condition could be checked in the JSP with a c:choose tag If useruserId is empty, the page would then do what it did previously and iterate the sections from editionsections However, this test has been placed in the bean for all the usual reasons about keeping the view simple In this case, it would be more correct to put this check in the controller, as the model needs to be controlled based on an external criterion Similarly, it will be necessary to notify the EditionBean of the user's ID when the user logs in This can be done with a simple addition to the login handler page:
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<c:set name="edition7userId" value="${user7userId}"/>
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Now that the navigation can make use of the user's section choices, a means for the user to alter them is needed The logical user interface for this would be a list of every section, with a check box next to the ones the user would like to see When the user goes to edit the list, the sections already selected should be checked so the user does not have to reenter the choices whenever adding or removing only one This again requires connection between the section and user_info tables but with an additional complication The page cannot show only the sections the user has selected, as that would not allow the person to add one Nor can it show only the ones the user has not selected, as there would then be no way to remove one This could be handled with two queries, first iterating one set of sections and then the other A better solution would be to select all the sections in one shot, along with an indicator as to whether the user has selected each This can be done with yet another feature of SQL: outer join The idea is that a normal, or inner, join between two tables A and B will have one row for each value common to both tables An outer join might have one row for every row in A If B has matching data, that data will be available; if not, those values will be marked as NULL To make these ideas more concrete, consider the two tables defined next
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create table character (character_id int,
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character_name char(10)) create table actor (actor_id int, actor_name char(10))
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insert into character values(1,'John Crichton') insert into character values(2,'Aeryn Sun') insert into character values(3,'Chiana')
insert into actor values(1,'Ben Browder') insert into actor values(3,'Gigi Edgley')
A regular inner join could be used to get a list of actors and characters: