Working with Data Views in .NET framework

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Working with Data Views
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Another way to manipulate the data contained in a data set for processing or viewing is using a data view A data view doesn't contain any data itself; as its name implies, it is just a view into the data in the table underneath it You can think of it as a lens that you place over a table that makes it look different to the consumer of the view, even though the underlying data is still whatever data is stored in the table that the view represents You can modify the data exposed through a data view, and when you do, you are actually modifying the data in the underlying table directly Every instance of a DataTable already has a default DataView instance associated with it, and it is actually this view that is used when you bind a table to a grid You can make modifications to the default data view, which will affect any controls that are bound to the underlying data table, or you can construct new instances of a DataView object to wrap a table for the purposes of sorting or filtering the data The DataView class implements Sort, RowFilter, and RowStateFilter properties that let you modify what data the view exposes You set the Sort property to an expression that specifies what column(s) to sort on and in what order You can set the RowFilter expression using the same syntax supported by the DataTableSelect method to restrict the rows presented by the view based on some criteria that is like a WHERE clause in a SQL statement Finally, you can use the RowStateFilter to only look at rows in a particular state, such as all Deleted or Added rows You can use all of these in combination with one another to specify fairly complex filtering and sorting criteria to expose data contained within a table in just about any way you need to: private void OnView(object sender, EventArgs e) { // Create the view wrapping the customers table DataView view = new DataView(m_CustomersTables["Customers"]); // Sort by CompanyName ascending, ContactName descending viewSort = "CompanyName ASC, ContactName DESC"; // Only show German customers viewRowFilter = "Country = 'Germany'"; // Only show inserted or edited rows viewRowStateFilter = DataViewRowStateAdded | DataViewRowStateModified; // Bind the view to a grid for viewing m_ResultsGridDataSource = view; }
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Sometimes you need to be able to execute multiple commands within the scope of a single database transaction, so that if any one of the commands fails, they all fail, and no changes are made to the database You can do this inside of SQL Server and other databases by beginning a transaction within a stored procedure, and committing it or rolling it back based on the outcome of all the queries encapsulated within the stored procedure However, sometimes you will want to control the transaction from within your ADONET code, wrapping the execution of multiple commands within a single transaction It is quite easy to do this You can use the SqlTransaction class (or corresponding classes for other managed providers) in conjunction with the connection to manage a transaction from your data access code For example, say you wanted to write code that first checked whether a row existed, and if it did, then make some modification to that row Let's also say that you needed to do this with two explicit SQL text queries from within your managed code You want to write bulletproof code, so you want to ensure that the row that will be affected by the update cannot be modified or deleted by another client or query between the time you check for its existence and when you update it Using a transaction with an appropriate isolation level will work just fine for this scenario Take a look at the code in Listing D9
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