select character_name,actor_name from actor, character where character_id = actor_id in Java

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select character_name,actor_name from actor, character where character_id = actor_id
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The result would be in the following table: John Crichton Chiana Ben Browder Gigi Edgley
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However, this table is missing information about characters for whom the corresponding actor is not available This can be remedied with an outer join:
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select character_name,actor_name from character left join actor on character_id = actor_id
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This produces the following table: John Crichton Aeryn Sun Chiana Ben Browder NULL Gigi Edgley
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This table contains all the information we have available and might serve to remind someone to insert "Claudia Black" into the actor table at some point It is now fairly straightforward to use these ideas to construct an equivalent query for users and sections, with an extra field to indicate which ones the user does not want:
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select section_name,name,user_id from section left join user_section on sectionsection_id = user_sectionsection_id
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where user_sectionuser_id =
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The result will have one row for each section For those that the user does not want, the row will also have the user's ID; sections that the user does want will have a value of NULL for this column Hiding this query in the EditionBean will require a little more work The easiest way to do this is to add a new property, selected, to the SectionBean and let the EditionBean set this property based on the results of the query Pages can then obtain this specially marked list of sections through a new allSections property, which can be used in the user preferences page, as shown in Listing 76[1]
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Of course, it would also be possible to use this property instead of
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selectedSections in the navigation
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by using the value of the selected flag to determine whether to show the section However, doing it that way would have missed out on a perfect opportunity to introduce the concept of nested selects, which is well worth knowing
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Listing 76 Selecting sections
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<jsp:setProperty name="user7" property="clearSections" value="true"/>
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<tr> <td class="label">Which sections do you want </td> <td> <c:forEach items="${edition7allSections}" var="section"> <input type="checkbox" name="sections" value="<c:out value="${sectionsectionId}"/>" <c:if test="${sectionselected}">CHECKED</c:if>> <c:out value="${sectionname}"/><br> </c:forEach> </td> </tr>
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Note that options are marked as checked if the corresponding field is empty, because the user should be shown the sections wanted, but the table keeps track of those not wanted When the form is submitted, the UserInfoBean will get passed an array of selected section IDs, which it must then use to add or remove entries in the user_section table This requires a bit of data manipulation in the Java layer, which can be found in the code for the UserInfoBean on the CD-ROM accompanying this book The keywords list, which will work almost exactly the same as the section list, will use an outer join to select all the available keywords and simultaneously flag which ones the user has selected The result is easily added to the user preferences page and is shown in Listing 77 Listing 77 Selecting keywords
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<jsp:setProperty name="user7" property="clearKeywords" value="true"/>
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<tr> <td class="label"> Select keywords in which you are interested: </td> <td> <c:forEach items="${edition7allKeywords}" var="word"> <input type="checkbox" name="keywords" value="<c:out value="${wordkeywordId}"/>" <c:if test="${wordselected}">CHECKED</c:if>> <c:out value="${wordname}"/><br> </c:forEach> </td> </tr>
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The new user customization page, with these two options added, is shown in Figure 72 Figure 72 The new customization page
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Finally, the user's selected keywords and the set of keywords associated with each article will be used to compute for each article a score that will be displayed on the front page and the section page Such a score can draw the user's attention to stories he or she is most likely to find interesting This score will be computed by examining each keyword; if both the user and the article either have or do not have that keyword, it will count for one point The final score will then be the total number of points, divided by the total number of keywords and multiplied by 100 to produce a percentage Of course, such a complex calculation should never be done in the view, so it will be added to the ArticleBean The ArticleBean will therefore need to know for which user its score should be computed, but this is easily handled by a jsp:setProperty tag This modifies the section page as shown in Listing 78, with the result shown in Figure 73 Figure 73 The new section page
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