creating barcode vb.net Adding the New TrainingEvent Object in Java

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Adding the New TrainingEvent Object
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Finally, we come to the TrainingEventRegistry method addTrainingEvent( ), which receives a new TrainingEvent object filled with data As before, the implementation of this method also varies based on the persistence technology However, in the Java-only version, the code to add a new TrainingEvent is as follows:
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// Non persisted Pure Java Demo only public String addTrainingEvent(TrainingEvent newTE) { // Calculate new id when adding event
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A p p l y i n g J S F : I n t r o d u c i n g t h e Vi r t u a l Tr a i n e r A p p l i c a t i o n
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// Persistence technologies would handle this automatically int maxid = 0; // Determine maximum id in event list for (int i = 0; i < eventlistsize(); i++) { TrainingEvent trainingEvent = (TrainingEvent) eventlistget(i); int currid = trainingEventgetId(); maxid = (currid > maxid) currid:maxid; } newTEsetId(maxid + 1);
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thiseventlistadd((TrainingEvent) newTE); return "success"; }
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Again, this implementation is for the pure Java-only demonstration version A Hibernate-based persistence implementation of the TrainingEventRegistry along with its data management methods, including addTrainingEvent( ), is shown later in the chapter in the section Taking the Next Step Persisting Virtual Trainer Data
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Implementing Sortable Columns
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The topic of sortable columns is actually somewhat of an advanced topic when having to implement them on your own Fortunately, most of the popular third-party component libraries, including MyFaces, Oracle s ADF Faces, and Sun s default component library, now provide out-of-the-box sortable column functionality in their respective table components However, this next section discusses how to implement sortable columns from scratch with a standard dataTable as a learning exercise and is provided with the Virtual Trainer application This is shown in Figure 9-20
FIGURE 9-20
Sortable columns in Virtual Trainer
Part II:
Extending JavaServer Faces
Implementing sortable columns with a dataTable can be done primarily in two ways The first way is to allow the source of the data (such as a database) to sort the data in the data-tier (where the database resides) before sending it to the Faces UI components in the Web-tier or middle-tier The second way is to implement a sorting functionality where sorting occurs entirely on the middle-tier There are different reasons for implementing one approach or the other based on several factors Both are detailed here, however
Implementing Data-Tier Sorting in Faces
Implementing a sorting capability using the data-tier is relatively easy providing the datatier server has built-in functionality to sort data, which is usually the case with a relational database The next thing needed is a set of data access methods which can trigger different queries with the different sorting settings or order by clauses In this sense, the user interface can remain simply a data presentation layer and not have to deal with advanced data manipulation Using the data-tier method of sorting simply requires that the user interface provide a way for the user to click table column links (or other UI artifacts) to execute action listener methods which, in turn, call data access methods that, in turn, call data-tier queries with the corresponding sort policy or order by clause Since relational databases usually come with built-in sorting capabilities, the work required to implement this approach lies mainly in just capturing a user s mouse click and determining which column to sort by and what direction Once these are determined, an appropriate mid-tier method such as getListSortedByEvents ( ) is called to execute the proper data-tier query The easiest way to assemble the UI to support column sorting is to place a commandLink in a column header and have its actionListener attribute bound to an intermediary action listener method that establishes which column to sort by, as well as in what direction The following UI code can facilitate this
<h:column> <f:facet name="header"> <h:commandLink actionListener="#{Main_BackingsortByEvent}" immediate="true"> <h:outputText value="Event Name"/> </h:commandLink> </f:facet> <h:outputText value="#{rowename}"/> </h:column>
The implementation of the sortByEvent method in the backing bean can set a global sortBy integer variable that designates which column (SORT_BY_EVENT) has been selected to be sorted A boolean sortEventAsc variable which keeps track of which direction to sort is also toggled It is important to note that in order for these values to persist through multiple requests, the parent backing bean (Main_Backing) must have its scope set to session The following backing bean code is able to keep track of the sorting options for two columns, Event and Date For every new column where sorting is to be implemented, a new boolean sort order flag (sort****Asc) as well as a static int referencing the column (SORT_ BY_****) would be needed in this implementation
public Class Main { // Static SORT_BY_*** constants private static final int SORT_BY_EVENT = 0;
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