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Next, create a new web form, and call it CalcCarValue.aspx. Drag an Atlas ScriptManager control to the design surface, and add HTML Input (Text) controls and an Input (Button) control to it. Label the three test fields as Make:, Model:, and Year:, and call them txtMake, txtModel, and txtYear, respectively. Give the button the text Get Value. Your screen should look like Figure 3-15.
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With the PTracker database complete, let s wrap up the chapter by creating the tables and stored procedures for the Security database. The PTIdentity object will use this database to perform
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During conversations with users, we discovered that a number of them are highly technical, and are already skeptical of our ability to create all the UI options they desire. They indicated high interest in having programmatic access to the database, or to our business objects. In other words, we have some power users who are used to programming in Access and know a bit of VBA, and they want to write their own reports, and maybe their own data entry routines.
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Note Exadata storage, mentioned in 14 Parallel Execution, is another method to offload encryption
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To lock the volume limit, touch the Lock Volume Limit button and enter a 4-digit passcode. You will be prompted to enter your passcode once more and the volume limit will then be locked.
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Let s log in using shared server and in that session query: ops$tkyte%ORA11GR2> select a.username, a.sid, a.serial#, a.server, 2 a.paddr, a.status, b.program 3 from v$session a left join v$process b 4 on (a.paddr = b.addr) 5 where a.username = "OPS$TKYTE" 6 / USERNAME SID SERIAL# SERVER PADDR STATUS PROGRAM --------- --- ------- --------- -------- -------- ----------------------------------OPS$TKYTE 49 239 SHARED 32BC20AC ACTIVE oracle@localhost.localdomain (S000) Our shared server connection is associated with a process the PADDR is there and we can join to V$PROCESS to pick up the name of this process. In this case, we see it is a shared server, as identified by the text S000. However, if we use another SQL*Plus window to query this same bit of information, while leaving our shared server session idle, we see something like this: sys%ORA11GR2> select a.username, a.sid, a.serial#, a.server, 2 a.paddr, a.status, b.program 3 from v$session a left join v$process b 4 on (a.paddr = b.addr) 5 where a.username = "OPS$TKYTE" 6 / USERNAME SID SERIAL# SERVER PADDR STATUS PROGRAM --------- ---- ------- --------- -------- -------- -----------------------------------OPS$TKYTE 49 239 NONE 32BC15D4 INACTIVE oracle@localhost.localdomain (D000) Notice that our PADDR is different and the name of the process we are associated with has also changed. Our idle shared server connection is now associated with a dispatcher, D000. Hence we have yet another method for observing multiple sessions pointing to a single process. A dispatcher could have hundreds, or even thousands, of sessions pointing to it. An interesting attribute of shared server connections is that the shared server process we use can change from call to call. If I were the only one using this system (as I am for these tests), running that query over and over as OPS$TKYTE would tend to produce the same PADDR of 32BC20AC over and over. However, if I were to open up more shared server connections and start to use those shared server connections in other sessions, then I might notice that the shared server I use varies. Consider this example. I ll query my current session information, showing the shared server I m using. Then in another shared server session, I ll perform a long-running operation (i.e., I ll monopolize that shared server). When I ask the database what shared server I m using again, I ll (in my current session) most likely see a different one (if the original one is off servicing the other session). In the following example, the code in bold represents a second SQL*Plus session that was connected via shared server: ops$tkyte%ORA11GR2> select a.username, a.sid, a.serial#, a.server, 2 a.paddr, a.status, b.program 3 from v$session a left join v$process b 4 on (a.paddr = b.addr) 5 where a.username = "OPS$TKYTE" 6 /
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print out this exception, as it will reveal errors in the script code. You can also get the file name, line number, and column number in which the error happened.
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formatter.Serialize(buffer, state) _stateStack.Push(buffer.ToArray()) End Using CopyStateComplete() End Sub <EditorBrowsable(EditorBrowsableState.Advanced)> _ Protected Overridable Sub CopyingState() End Sub <EditorBrowsable(EditorBrowsableState.Advanced)> _ Protected Overridable Sub CopyStateComplete() End Sub The CopyState() method is scoped as Protected because BusinessBase subclasses UndoableBase, and the BeginEdit() method in BusinessBase will need to call CopyState(). To take a snapshot of data, there needs to be somewhere to store the various field values before they are pushed onto the stack. A HybridDictionary is ideal for this purpose, because it stores name/ value pairs. It also provides high-speed access to values based on their names, which is important for the undo implementation. Finally, the HybridDictionary object supports .NET serialization, which means that it can be serialized and passed by value across the network as part of a business object. The CopyState() routine is essentially a big loop that starts with the outermost class in the object s inheritance hierarchy and walks back up through the chain of classes until it gets to UndoableBase. At that point, it can stop it knows that it has a snapshot of all the business data. At the start and end of the process, methods are called so a subclass can do pre- and postprocessing. Notice that CopyingState() and CopyStateComplete() are Overridable methods with no implementation. The idea is that a subclass can override these methods if additional actions should be taken before or after the object s state is copied. They provide an extensibility point for advanced business developers.
The types InputStream and OutputStream represent the input and output results of an individual IComponent implementation. When implementing the IComponent interface, you have three different implementation styles available, defined as follows: Input sink: An input sink adds data to the data stream by generating data locally or from an external stream such as a web service. The input sink is responsible for adding content to the stream. An input sink won t remove content. Filter: A filter will read the input stream, process the data, and generate an output stream. Some filters may add data like an input sink, but more importantly filters are responsible for transferring the data from the input stream to the output stream. Output sink: An output sink doesn t add data to the output stream and only reads the data to transfer the information to another streaming mechanism. Other stream mechanisms could include web services or a database. When populating the Chain type with IComponent implementations, the collection would contain one or more input sinks, followed by none or multiple filters, and terminated by an output sink. Each IComponent implementation has the responsibility to transfer data from the InputStream interface stream to the OutputStream interface stream.
Listing 6-2. An XML Schema for a Course Schedule
Code Execution in the Method Body
When you define an AssemblyRef in the metadata, you expect the loader to find exactly this assembly and load it into the application domain. Let s have a look at the process of finding an external assembly and binding it to the referencing application. Given an AssemblyRef, the process of binding to that assembly is influenced by these factors: The application base (AppBase), which is a URL to the referencing application location (that is, to the directory in which your application is located). For executables, this is the directory containing the EXE file. For Web applications, the AppBase is the root directory of the application as defined by the Web server. Version policies specified by the application, by the publisher of the shared assembly being referenced, or by the administrator.
CHAPTER 12 DATATYPES
Figure 14-10. A jagged array is an array of arrays.
6 when others 7 then 8 -- call some log_error() routine 9 null; 10 end; 11 / SP2-0804: Procedure created with compilation warnings ops$tkyte%ORA11GR2> show errors procedure some_proc Errors for PROCEDURE P: LINE/COL ERROR -------- ----------------------------------------------------------------1/1 PLW-05018: unit SOME_PROC omitted optional AUTHID clause; default value DEFINER used 6/8 PLW-06009: procedure "SOME_PROC" OTHERS handler does not end in RAISE or RAISE_APPLICATION_ERROR
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