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.
Our stored procedure will accept a set of rows with two columns: Customer ID and Status ID.
Both Customer ID and Status ID must be valid entries in the Customers and Status tables, respectively.
Right-click on the Designer, select the Add option from the context menu, and pick the Table Adapter menu item. This will run the stored procedure and show its results in the Output window (see Figure 9). Alternatively, we could have added these columns manually to the Data Table. NET books and founder of 4Guys From Rolla.com, has been working with Microsoft Web technologies since 1998. or via his blog, which can be found at On Writing. This tutorial series was reviewed by many helpful reviewers.
This will launch the Table Adapter Configuration wizard. Figure 9: The Stored Procedures Results are Displayed in the Output Window (Click to view full-size image) At this point, the We have explored manually adding Data Table columns in previous tutorials, including Master/Detail Using a Bulleted List of Master Records with a Details Data List and Uploading Files, and we will look at this process again in more detail in our next tutorial. We will explore manually adding columns to the Data Table in the next tutorial. Scott works as an independent consultant, trainer, and writer. Lead reviewers for this tutorial were Hilton Geisenow, David Suru, and Teresa Murphy.
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.
When building a Data Access Layer using Typed Data Sets, the tools work better when using subqueries. Over the next several steps we will create a Table Adapter that, initially, uses a main query that omits any that returns additional columns from related tables. Fortunately, Table Adapters created using stored procedures do not suffer from the same brittleness as those created using ad-hoc SQL statements.
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.
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.
With relational databases the data we are interested in working with is often spread across multiple tables. Supplier ID s and correlated subqueries can both be used to retrieve related data from other tables, many developers are left scratching their heads and wondering which approach to use. Second, change the Object Data Source s table, causing the delete to fail.
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.
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.