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n 2, we took a look at the structure of schemas and how they relate to an XML file. Schemas not only describe the structure of an XML file, but they also can place constraints on the data that is contained within the file. Why is this important Well, imagine that you ve recently bought a model rocket kit online. Your kit shows up, and you eagerly begin construction of the space-bound ship. However, you get to the last step and realize that the manufacturer has neglected to supply the nose cone. So you re left with a rocket-propelled toilet paper tube and not your intergalactic starship. The product is useless for the task for which you purchased it. The same can be said about file schemas. They are the parts list for the files with which they are associated. If the right parts or data are not included with the targeted file, then the file is useless for the task in which it is being consumed. In BizTalk terms, we call this a failed validation of the file. In this chapter, you will use Visual Studio and the BizTalk Schema Editor to create a few schemas that describe two different file formats: an XML file and a CSV flat file. You ll want to have a firm grasp on schema creation before moving on to the next chapter, as the schemageneration process is essential to success when dealing with BizTalk.
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Serialization is the process of taking a C# object or value and creating a stream of bytes or an XML document. Deserialization is the opposite process: taking the previously generate bytes or XML and using them to recreate the serialized object or value. Serialization can create long-lived objects, which are serialized and stored, typically to disk, when a program exits and are then retrieved from storage and deserialized the next time they are required. The other main use for serialization is to transmit copies of objects across a network to a remote application. You unknowingly took advantage of this feature when you looked at the Windows Communication Foundation in 21. The .NET Framework contains four separate serialization systems. Each serialization system has its own benefits and drawbacks. In this chapter, I ll show you how to use each of them to serialize and deserialized C# objects and values. As a general rule, binary serialization offers the best performance when you intend to serialize objects for use only within .NET programs, but that performance comes with a lack of compatibility with other languages and systems. If you need to create serialized data that you can share with non-.NET systems, the I recommend using the Data Contract Serializer, particularly because you can choose to emit JSON data, which is simple and very widely supported. Table 23-1 provides the summary for this chapter. Table 23-1. Quick Problem/Solution Reference for 23
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} DisplayTypeInfo(num); DisplayTypeInfo(date); </script>
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The reason this snapshot process is so complex is that the values of all fields in each object must be copied, and each business object is essentially composed of several classes all merged together through inheritance and aggregation. This causes problems when classes have fields with the same names as fields in the classes they inherit from, and it causes particular problems if a class inherits from another class in a different assembly. Since UndoableBase is a base class from which BusinessBase will ultimately derive, it must be marked as Serializable. It is also declared as abstract, so that no one can create an instance of this class directly. All business objects need to utilize the INotifyPropertyChanged interface implemented in BindableBase so they inherit from that, too. Finally, the n-level undo functionality relies on the IUndoableObject interface from the Csla.Core namespace, so that is implemented in this class (and in BusinessListBase, discussed later in its own section): [Serializable] public abstract class UndoableBase : Csla.Core.BindableBase, Csla.Core.IUndoableObject { } With that base laid down, I can start to discuss how to implement the undo functionality. There are three operations involved: taking a snapshot of the object state, restoring the object state in case of an undo, and discarding the stored object state in case of an accept operation. Additionally, if this object has child objects that implement IUndoableObject, those child objects must also perform the store, restore, and accept operations. To achieve this, any time the algorithm encounters a field that s derived from either of these types, it cascades the operation to that object so it can take appropriate action.
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ImageOpenSucceeded Fires when an image file is successfully opened. The event handler method is passed RoutedEventHandler. MotionFinished Fires when the currently ongoing motion (zoom or pan) is complete. The event handler method is passed RoutedEventHandler. Fires when the viewport (the area of the image displayed) changes. The event handler method is passed RoutedEventHandler.
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Next, let s look at some of the information Oracle will use. We are specifically going to look at the CLUSTERING_FACTOR column found in the USER_INDEXES view. The Oracle Reference Manual tells us this column has the following meaning:
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Binding.ValidatesOnExceptions Property
The point is that your preferred security tokens and your preferred hashing and encryption algorithms are simply a means to a bigger goal of establishing trusted communication, otherwise known in the Web services world as secure conversation. There is no single correct choice of technologies that you should always use. Instead, you need to be using those technologies that are appropriate for establishing a trusted, secure conversation between a given client and a Web service. The rules can change depending on who is doing the communicating. This chapter focuses on how you establish session-oriented, trusted communications using the WS-Secure Conversation specification. The great thing about the WS- specifications is that many of the concepts complement each other and build on each other. The understanding that you now have about WS-Security and WS-Policy will translate directly into the concepts behind WS-Secure Conversation. By the end of this chapter, you will have a good understanding of what constitutes secure conversation, and a broader appreciation for the usefulness of the WS-Security family of specifications.
CHAPTER 7: Postage
A number between 1 and 4,000 for up to 4,000 bytes of storage. In the following section, we ll examine in detail the differences and nuances of the BYTE versus CHAR modifier in that clause. A number between 1 and 2,000 for up to 2,000 bytes of storage. A number greater than 0 whose upper bound is dictated by your national character set. A number greater than 0 whose upper bound is dictated by your national character set.
SQL>set serveroutput off SQL>SELECT AVG(BILL_SEQUENCE_ID) FROM BOM WHERE ORG_ID = :orgid ; AVG(BILL_SEQUENCE_ID) --------------------1 row selected. SQL>select * from table(dbms_xplan.display_cursor(null,null,"ALLSTATS LAST 2 +PEEKED_BINDS -ROWS")); PLAN_TABLE_OUTPUT ------------------------------------SQL_ID 8xbvq97cr6zx2, child number 0 ------------------------------------SELECT AVG(BILL_SEQUENCE_ID) FROM BOM WHERE ORG_ID = :orgid Plan hash value: 1633877697 -----------------------------------------------------------------------------------| Id | Operation | Name |Starts | A-Rows | A-Time | Buffers | -----------------------------------------------------------------------------------| 0 | SELECT STATEMENT | | | 1 |00:00.01 | 31 | | 1 | SORT AGGREGATE | | 1 | 1 |00:00.01 | 31 | | 2 | TABLE ACCESS BY INDEX ROWID| BOM | 1 | 0 |00:00.01 | 31 | |* 3 | INDEX SKIP SCAN | BOM_N1 | 1 | 0 |00:00.01 | 31 | -----------------------------------------------------------------------------------Peeked Binds (identified by position): -------------------------------------1 - (NUMBER): 1 Predicate Information (identified by operation id): --------------------------------------------------3 - access("ORG_ID"=:ORGID) filter("ORG_ID"=:ORGID) 26 rows selected. SQL> SQL>explain plan for SELECT AVG(BILL_SEQUENCE_ID) FROM BOM WHERE ORG_ID = :orgid ; Explained. SQL>select * from table(dbms_xplan.display) ;
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