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The object context provides a Refresh method that you can call to bring entities back into sync with the current state of the rows they represent in the database. You could call this after catching an OptimisticConcurrencyException as the first step in your code that recovers from a problem. (You re not actually required to wait until you get a concurrency exception you re free to call Refresh at any time.) The first argument to Refresh tells it what you d like to happen if the database and entity are out of sync. Passing RefreshMode.StoreWins tells the EF that you want the entity to reflect what s currently in the database, even if that means discarding updates previously made in memory to the entity. Or you can pass RefreshMode.ClientWins, in which case any changes in the entity remain present in memory. The changes will not be written back to the database until you next call SaveChanges. So the significance of calling Refresh in ClientWins mode is that you have, in effect, acknowledged changes to the underlying database if changes in the database were previously causing SaveChanges to throw an OptimisticConcurrencyException, calling SaveChanges again after the Refresh will not throw again (unless the database changes again in between the call to Refresh and the second SaveChanges).
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You can access any of these new touch events by one of two methods, as you can with other events in HTML. First, you can link an event handler as part of an object s HTML definition:
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Each of the part controls contained within the template zones of the EditorZone and CatalogZone exist to provide a specific piece of functionality. Within the EditorZone, the AppearanceEditorPart control allows users to manage certain appearance aspects of web parts, such as their title, height, and width. The BehaviorEditorPart enables administrators to control other web part properties such as the TitleUrl or the CatalogIcon for the web part. In the ZoneTemplate of the CatalogZone, a PageCatalogPart is declared that provides users with a way to manage which web parts are displayed on the page at any given time. Noting that each of the zones shown in listings 5.1 and 5.2 has had a ZoneTemplate provides insight into the similarities that exist between them. Not only do the zones each have a ZoneTemplate, but we can see that each of the three zones shown in these examples WebPartZone, CatalogZone, and EditorZone has contained an identical set of style elements. So while I ve told you that zones fall into two camps WebPart zones and Tool zones it s clear that quite a few similarities exist across all zones. The section that follows explores the inherent similarities in zones because all zones are derived from a common base class. 5.2.3 WebZone the common base class Now that we ve seen how all zones fall into one of two categories, it s important to understand that both the ToolZone and WebPartZone classes themselves inherit from a common base class named WebZone. The inheritance hierarchy for all zones can be seen in the following code snippet: WebZone ToolZone CatalogZoneBase CatalogZone EditorZoneBase EditorZone ConnectionsZone WebPartZoneBase WebPartZone This hierarchy listing shows us that, regardless of whether a zone is a WebPart zone or a Tool zone, all zones are ultimately derived from the WebZone class, and it s this
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3.1 Using a data source
In this chapter, you ll work mainly with UITouches (which make it easy to parse single-touch events) and not with UIEvents (which are more important for parsing multitouch events). Let s lead off with a more in-depth look at each.
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initDocumentMouseHandler: function() { this.ajaxWindowsMouseUpHandler = ajaxWindowsMouseUpHandler; Store our own reference var oThis = this; document.onmouseup = function() { oThis.handleMouseUp(); }; },
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In chapter 7 you learned how to develop the application domain model using JPA. In chapter 8 you saw how domain objects and relationships are mapped to the database. While the ORM annotations we explored in chapter 8 indicate how an entity is persisted, the annotations don t do the actual persisting. This is performed by applications using the EntityManager interface, the topic of this chapter. To use an analogy, the domain model annotated with ORM configuration is like a children s toy that needs assembly. The domain model consists of the parts of the toy. The ORM configuration is the assembly instructions. While the assembly instructions tell you how the toy parts are put together, you do the actual assembly. The EntityManager is the toy assembler of the persistence world. It figures out how to persist the domain by looking at the ORM configuration. More specifically, the EntityManager performs CRUD (Create, Read, Update, Delete) operations on domain objects. The Read part includes extremely robust search and retrieval of domain objects from the database. This chapter covers each of the CRUD operations that the EntityManager provides, with the exception of the search part of search and retrieval. In addition to simple primary key based domain object retrieval, JPA provides SQL SELECT like search capabilities through the EJB 3 query API. The query API is so extensive and powerful that we ll dedicate chapter 10 to it while briefly touching on it in this one. Before we dive down into the persistence operations, you ll learn about the EntityManager interface, the lifecycle of entities, the concept of persistence context, and how to obtain an instance of EntityManager. We ll discuss entity lifecycle callback listeners before concluding with best practices. Before we get into too much code, we re going to gently introduce the EntityManager and briefly cover some concepts useful in understanding the nuances behind this critical part of JPA.
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