Building Stored Procedures in Visual Studio .NET

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FROM WHERE RETURN
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ProductType, StockType Product (ProductID = @ProductID)
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Notice that after you save the stored procedure the rst time, the CREATE keyword at the beginning of the procedure changes to ALTER From this point forward, you are altering an existing stored procedure Use the Query Builder any time you need to insert a T-SQL statement into a stored procedure
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For the Purchase Tracker sample application: NOTE: If you are using Microsoft Access, you can use the Microsoft Access management tool to detail each QueryDef Open the ProductRetrieveByID_sp stored procedure in the Code Editor Launch the Query Builder and add the Product table to the query The Product table is added to the FROM clause in the SQL statement Select Product table columns in the Diagram Pane, as shown in Figure 812 The columns are added to the SELECT clause in the SQL statement Add the @ProductID parameter as a filter using the Criteria Pane, as shown in Figure 812 The parameter is added to the WHERE clause in the SQL statement Click Execute Query to try out the resulting query The result of the query is shown in the Results Pane, as shown in Figure 812 Your result may vary if you entered different sample data When the query returns the desired result, click OK to write the query to the stored procedure and save the completed stored procedure Follow similar steps to add a T-SQL statement to the CustomerRetrieveByID_sp stored procedure
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8 BUILDING THE DATA ACCESS LAYER
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Return all Customer table columns using the @CustomerID parameter as the filter This returns all data for a particular customer Follow similar steps to add a T-SQL statement to the PurchaseRetrieveByCustomerID_sp stored procedure Return all Purchase table columns using the @CustomerID parameter as the filter This returns all the purchases for a particular customer Follow similar steps to add a T-SQL statement to the ProductRetrieveList_sp stored procedure Return only the ProductID and ProductName columns from the Product table using no filter This returns identification information for all the products The application uses this stored procedure to display the list of products for user selection Follow similar steps to add a T-SQL statement to the CustomerRetrieveList_sp stored procedure Return only the CustomerID and CustomerName columns from the Customer table using no filter This returns identification information for all the customers The application uses this stored procddure to display the list of customers for user selection Since there is no CustomerName column in the Customer table, return it using the following syntax:
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CREATE PROCEDURE dboCustomerRetrieveList AS SELECT CustomerID, LastName + , + FirstName AS CustomerName FROM Customer RETURN
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This defines an additional column in the query results The As clause defines an alias, giving the additional column a name Be sure to test and then save each of the updated stored procedures
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Creating a Save Stored Procedure
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So far all of the stored procedures created in this chapter have retrieved data from the database You also need to de ne stored procedures to save data The T-SQL statements you need to save data are different for inserts, updates, and deletes, so you need multiple T-SQL statements to perform your save logic
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Building Stored Procedures
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NOTE: The rest of this section details how to create SQL Server stored procedures for saving data If you are using a different database management product, you can use that product s tools to create your stored procedures or QueryDefs
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There are two primary techniques for creating a save stored procedure:
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Create three separate stored procedures: one to perform updates, one for deletes, and one for inserts
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NOTE: For auditing purposes, some applications do not allow the users to delete data Instead, you can add a Status system column to each table, defining whether a row is active or deleted In that case, you don t need delete functionality in your stored procedures, because a delete is simply an update of the Status column
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