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Therefore, we will start by creating a Table Adapter whose main query does not contain any folder. Last Name as Manager Last Name FROM Employees LEFT JOIN Employees AS Manager ON Employees. Employee ID stored procedure in the Server Explorer and choose Execute. With the Table Adapter s initial configuration complete, we augmented the stored procedure.
To provide business value, this new service needs to be low latency, providing very fast response times under non-trivial load (e.g.To retrieve data from two different tables we can use either a correlated subquery or a JOIN operation. To allow users to delete employees from this page we need to do two things.In this tutorial we compare correlated subqueries and the JOIN syntax before looking at how to create a Table Adapter that includes a JOIN in its main query. First, instruct the Grid View to provide deleting capabilities by checking the Enable Deleting option from its smart tag.The SELECT Product ID, Product Name, Supplier ID, Category ID, Quantity Per Unit, Unit Price, Units In Stock, Units On Order, Reorder Level, Discontinued, (SELECT Category Name FROM Categories WHERE Categories. Category ID) as Category Name, (SELECT Company Name FROM Suppliers WHERE Suppliers. Supplier ID) as Supplier Name FROM Products SELECT Product ID, Product Name, Products. Category ID, Quantity Per Unit, Unit Price, Units In Stock, Units On Order, Reorder Level, Discontinued, Categories. Company Name as Supplier Name FROM Products LEFT JOIN Categories ON Categories. Their advice, then, is to use the technique that you and your team are most comfortable with. That means all of the customizations we later made would be lost if we right-clicked on the Table Adapter, chose Configure from the context menu, and completed the wizard again. In previous tutorials we most commonly made use of correlated subqueries because the Table Adapter cannot auto-generate s.It merits noting that after imparting this advice these experts immediately express their preference of s over correlated subqueries. The brittleness of the Table Adapter s auto-generated stored procedures and re-run the Table Adapter Configuration wizard without having to fear that the stored procedures will be modified. While these values can be provided manually, when using ad-hoc SQL statements any customizations will be overwritten when the Table Adapter Configuration wizard is completed.For a refresher on creating new stored procedures from the Table Adapter s wizard, consult the Creating New Stored Procedures for the Typed Data Set s Table Adapters tutorial. Start by right-clicking on the and selecting Configure from the context menu.
Figure 5: Select the Create new stored procedures Option (Click to view full-size image) Use the following properties are correctly configured to call the corresponding stored procedures. This brings up the Table Adapter Configuration wizard, which lists the stored procedures used for selecting, inserting, updating, and deleting, along with their return values and parameters (if any). Here we can see that the stored procedure is in effect and that the insert, update, and delete capabilities of the Table Adapter are still functional, let s create a web page that allows users to view and delete employees.
Figure 8: The Table Adapter Includes Insert, Update, and Delete Capabilities (Click to view full-size image) With the insert, update, and delete stored procedures automatically created and the values. Before we create such a page, however, we need to first create a new class in the Business Logic Layer for working with employees from the using System; using System.
After the stored procedure has been updated, we will need to update the Data Table so that it includes these additional columns. Start by going to the Server Explorer, drilling down into the Northwind database s Stored Procedures folder, and opening the SELECT Employees.
The more you understand about how fields really work, the better you will be able to troubleshoot problems that may occur or to tweak an individual field’s options to fit an unusual formatting need.
When working with a database it is common to request data that is spread across multiple tables. Html Controls; using Northwind With Sprocs Table Adapters; [System. Data Object] public class Employees BLLWith Sprocs properties for the last four Bound Fields to Last Name, First Name, Manager s First Name, and Manager s Last Name, respectively.
For example, when you insert a date or time and set it to be automatically updated, Word inserts a code.