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At this point, you should have a good understanding of logical and physical architectures and how you can configure a 5-layer logical architecture into various n-tier physical architectures. In one way or another, all of these layers will use or interact with the application s data. That s obviously the case for the Data Storage and Management and Data Access layers, but the Business layer must validate, calculate, and manipulate data; the Interface Control layer transfers data between the Business and Interface layers (often performing formatting or using the data to make navigational choices); and the Interface layer displays data to the user and collects new data as it s entered. In an ideal world, all of the business logic would exist in the Business layer, but in reality, this is virtually impossible to achieve. In a web-based application, validation logic is often included in the Interface layer, so that the user gets a more interactive experience in the browser. Unfortunately, any validation that s done in the web browser is unreliable, because it s too easy for a malicious user to bypass that validation. Thus, any validation done in the browser must be rechecked in the Business layer as well.

What algorithm is used to set and get property values from this array in a meaningful manner In short, each property is assigned a numeric index value between 0 and the number of properties registered for the business object type Assigning these index values is the challenge, and it is complicated by inheritance Earlier in the chapter, I discussed the PropertyInfoManager and how it maintains a list of IPropertyInfo objects for each business object type Remember that a business object type might be a subclass of some other type It turns out that any level in the inheritance hierarchy might declare a property and register it by calling RegisterProperty() This means that to get a consolidated list of all properties declared by a business object, it is necessary to walk through all the types in the inheritance hierarchy, getting the list of IPropertyInfo objects for each of the types.

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Note You are free to invoke the CLP from the command line interactively. Any time you have a sequence of commands that you want to invoke routinely, it s useful to use the command-line approach.

Obviously, that process could be relatively expensive, so it is done only once, and the result is cached FieldDataManager includes a GetConsolidatedList() method that retrieves the consolidated list of properties if it has already been generated, or it calls CreateConsolidatedList() to create the list The CreateConsolidatedList() method is the interesting part of this process, because it assembles the consolidated list and assigns the numeric index values Here is the method from the FieldDataManager class: Private Shared Function CreateConsolidatedList(ByVal type As Type) _ As List(Of IPropertyInfo) Dim result As New List(Of IPropertyInfo)())() ' get inheritance hierarchy Dim current As Type = type Dim hierarchy As New List(Of Type)())() Do hierarchyAdd(current) current = currentBaseType Loop While current IsNot Nothing _ AndAlso Not currentEquals(GetType(BusinessBase)) ' walk from top to bottom to build consolidated list For index As Integer = hierarchyCount - 1 To 0 Step -1 result.

overview of this design pattern, please consult the article Java Modeling: A UML Workbook at http:// www-106.ibm.com/developerworks/java/library/j-jmod0604/.

There are actually two ways to invoke the CLP in command-line mode. The first is to provide a SQL command, or a SQLite shell command as well, such as .dump and .schema. Any valid SQL or SQLite shell command will do. SQLite will execute the specified command, print the result to standard output, and exit. For example, to dump the test.db database from the command line, issue the following command: sqlite3 test.db .dump To make it useful, we should redirect the output to a file: sqlite3 test.db .dump > test.sql The file test.sql now contains the complete human-readable set of DDL and DML statements for the database test.db. Similarly, to select all records for the test table, issue this: sqlite3 test.db "select * from test" The second way to invoke the CLP in command-line mode is to redirect a file as an input stream. For instance, to create a new database test2.db from our database dump test.sql, do the following: sqlite3 test2.db < test.sql The CLP will read the file as standard input and then process and apply all SQL commands within it to the test2.db database file. Another way to create a database from the test.sql file is to use the init option and provide the test.sql as an argument: sqlite3 init test.sql test3.db The CLP will process test.sql, create the test3.db database, and then go into shell mode. Why The invocation included no SQL command or input stream. To get around this, you need to provide a SQL command or SQLite shell command. For example: sqlite3 init test.sql test3.db .exit The .exit command prompts the CLP to run in command-line mode and does as little as possible. All things considered, redirection is perhaps the easiest method for processing files from the command line.

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