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Once you have autogenerated the WSDL document, there are three main things that you will want to do with it. First, you will need to abstract out the data type information from the embedded <types> element into a separate XSD schema file. This is essential in an SOA so that other Web services and clients can have access to the same centralized schema definition file of the custom data types. Second, you can use a command-line tool called wsdl.exe to autogenerate proxy classes that clients can use to interact with the Web service. You can replicate the same feature in Visual Studio .NET by adding a Web reference from a client project to a Web service. Third, you can use the same utility with alternate switches to generate server-side code implementations of the Web service contract. You may either generate abstract classes, or you can generate service interface code methods that can be directly implemented rather than overridden. These code-generation capabilities are useful for creating a server-side backend implementation based on an established Web service contract. You will see examples of this in s 3 and 4, where we use the utility to generate stub classes for the sample Web service implementation. As you become a more sophisticated Web services developer, you will end up spending more time developing outside of the comfortable environment of Visual Studio .NET. This is because you will grow to need a higher level of control over your Web services development than Visual Studio .NET can currently provide.

Behind the scenes, the data portal calls the MarkAsChild() method so the object is explicitly marked as a child, and if you choose not to use the data portal to create your child objects, you ll need to ensure manually that MarkAsChild() is called The Business Methods region is the same as with a root object: it simply implements the properties and methods required by the business rules Similarly, the Validation Rules and Authorization Rules regions are the same as with a root object The Factory Methods region is a bit different The factory methods are Friend rather than Public, as they should be called only by the parent object, not by the UI code Also, there s no need for a Shared delete method, because BusinessBase implements a DeleteChild() method that BusinessListBase calls automatically when the child is removed from a collection.

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Perhaps most importantly, notice the data portal calls to CreateChild() and FetchChild() (rather than to Create() and Fetch()) in the factory methods Also, notice how the GetEditableChild() method accepts a parameter containing child data This parameter is passed from the parent and includes the data necessary to load this child object s field values Normally this value will be a LINQ to SQL or ADONET Entity Framework entity object, an ADONET DataReader that is already pointing to the correct row of data, or something similar And normally the parameter won t be of type Object but will be strongly typed The biggest difference from a root object comes in the Data Access region Instead of DataPortal_XYZ methods, a child object implements Child_XYZ methods The Child_Create() method is implemented to support the loading of default values on the creation of a new child object.

sqlite> create table domain (x integer check(typeof(x)='integer')); sqlite> insert into domain values('1'); SQL error: constraint failed sqlite> insert into domain values(1.1); SQL error: constraint failed sqlite> insert into domain values(1); sqlite> select x, typeof(x) from domain;

Please note that this method doesn t run on the application server, so Child_Create() cannot talk to the database It is useful only for loading default values that are hard-coded, from some other object, or from a client-side configuration file The Child_Fetch() method typically accepts a parameter containing the data that should be used to load the object s field values Normally the parent object loads all the data for its children and provides that data through a parameter A less efficient approach is to have each child object contact the database independently to load its data..

Summary

The only catch here is that you are limited to checking for SQLite s native storage classes (or what can be implemented using other built-in SQL functions). However, if you are a programmer and either use a language extension that supports SQLite s user-defined functions (for example, Perl, Python, or Ruby) or use the SQLite C API directly, you can implement even more elaborate functions for type checking, which can be called from within CHECK constraintsithin CHECK constraints.

The Child_Insert(), Child_Update(), and Child_Delete() methods typically accept a reference to the parent object as a parameter. The assumption is that any child object will need data from the parent while being inserted or updated into the database. Most often, the parent contains a foreign key value required by the child object during data access.

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