Updating the Dataset in Visual Studio .NET

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Listing 6-16 Updating the Dataset
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public void UpdateCourses(CoursesDataset ds) { SqlCommand insertCommand; SqlCommand updateCommand; SqlCommand deleteCommand; CreateCommandsForUpdate(out insertCommand, out updateCommand, out deleteCommand); SqlDataAdapter adapter = new SqlDataAdapter(); adapterInsertCommand = insertCommand; adapterUpdateCommand = updateCommand; adapterDeleteCommand = deleteCommand; adapterUpdate(dsCourse); }
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If both courses and course dates must be updated, you must be aware of the order when updating the database tables CourseInfo and CourseDates Because of the dependency between these tables, when adding new records, you must add the CourseInfo records before CourseDates With deleting records, CourseDates records must be deleted before CourseInfo records To get such a scenario, you must split up the call of a simple Update as used in Listing 6-16 to multiple updates, where only records are deleted or updated Listing 6-17 shows how you can split the update Both the DataSet and a DataTable objects have a method GetChanges that enables you to define whether inserted, updated, or deleted rows are needed Calling the method GetChanges with the parameter valueDataRowStateModified returns all rows that have been modified, whereas the parameter value DataRowStateAdded only returns the added rows The returned CourseDataTable is passed to the SqlDataAdapter object to write the changes to the database The data that is updated must be written back into the dataset, which you can do by using the Merge method Now it is possible to add code to write changes to the course dates in a similar way Deletion of course dates must be done before deletion of courses, whereas inserting course dates must be done after inserting courses
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Listing 6-17 Updating the Dataset with Multiple Tables
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public void UpdateCourses(CoursesDataset ds) { SqlCommand insertCommand; SqlCommand updateCommand; SqlCommand deleteCommand; CreateCommandsForUpdate(out insertCommand, out updateCommand, out deleteCommand); SqlDataAdapter adapter = new SqlDataAdapter();
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// 1 update modified courses CoursesDatasetCourseDataTable modifiedCourses = (CoursesDatasetCourseDataTable)dsCourseGetChanges( DataRowStateModified); if (modifiedCourses != null) { adapterUpdate(modifiedCourses); dsMerge(modifiedCourses); } // 2 insert new courses CoursesDatasetCourseDataTable insertedCourses = (CoursesDatasetCourseDataTable)dsCourseGetChanges( DataRowStateAdded); if (insertedCourses != null) { adapterUpdate(insertedCourses); dsMerge(insertedCourses); } // 3 delete courses CoursesDatasetCourseDataTable deletedCourses = (CoursesDatasetCourseDataTable)dsCourseGetChanges( DataRowStateDeleted); if (deletedCourses != null) { adapterUpdate(deletedCourses); dsMerge(deletedCourses); }
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Business Objects or Datasets
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The typed dataset is very helpful insofar as tables and columns are available as property names This is a big advantage when compared to untyped datasets, where only indexers can be used to access columns and rows However, the typed dataset still has disadvantages if you compare this technology to entity classes With a typed dataset, all the members of the base class DataSet are available, which you sometimes want to avoid For example, you can use indexers to access column values because the indexers are implemented in the base class DataSet The use of entity classes enables you to avoid such a behavior Also, datasets do have a relational representation of data Using business objects, you can have better reuse of your business components and design the objects based on completely different approaches and design principles However, a dataset does have a big advantage because it knows about original data in addition to current data This knowledge can be used to resolve optimistic concurrency conflicts With entity classes, you have to implement such a behavior yourself Datasets also allow sorting and filtering
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Summary
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This chapter discussed using ADONET for data access As you have learned in this chapter, ADONET enables you to access relational data by using the NET data provider for SQL Server with the SqlConnection and SqlCommand classes and the respective SQL statements Reading data with the SqlDataReader was also discussed, as were datasets Transactions have been completely left out of this chapter They are a primary reason why serviced components are used, and are covered in the next chapter
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You can read more about ADONET in the bookPragmatic ADONET, by Shawn Wildermuth Transactions are covered in 7, "Transaction Services" Serialization across the network with NET Remoting and COM is discussed in 5, "Networking" Using construction strings with serviced components is discussed in 2, "Object Activation and Contexts" That is why you should not use a query withSELECT * Using such a query means you are very dependent on database changes Security is discussed in 12, "Security" You can also create a relation with an untyped dataset using an XML schema You can load the XML schema to an untyped dataset programmatically with the ReadXmlSchema method Loading the schema creates the relations and keys that are defined with the schema
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