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Returning a Set of Records
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One method of achieving output from a stored procedure is to return a set of records, also known as a recordset. This recordset may contain zero, one, or many records as a single batch of output. This is achieved through the use of the SELECT statement within a stored procedure what is selected is returned as the output of the stored procedure. Don t be fooled into thinking, though, that we can only return one recordset within a stored procedure, as this is not true: we can return as many recordsets as we wish. In this chapter, you will see single recordsets of data returned and how these look within Query Editor. Returning single, or even multiple, recordsets should not really concern you at this stage, but is of more concern to developers in languages such as C#, VB .NET, and so on. Multiple recordsets will only concern you when we move on to more advanced stored procedures with multiple queries.
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Creating a Stored Procedure: Management Studio
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Now that you have seen some of the merits of a stored procedure over other methods of working with data, it is time to create the first stored procedure in this chapter. This stored procedure will be built within SQL Server Management Studio to insert a customer into the CustomerDetails.Customers table from the information passed to it. This is also the first part in our overall security solution. By using a stored procedure to enter the data into the underlying table, we will be in control of what data is entered, as the data can be validated and verified. You can also remove all access from the table and leave the stored procedure to serve as the only method of inserting data (you would also have stored procedures that update, delete, and retrieve data). We will look at this towards the end of the chapter.
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Try It Out: Creating a Stored Procedure Using SQL Server Management Studio
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1. Navigate to the ApressFinancial database and right-click Stored Procedures. From the pop-up menu, select New Stored Procedure. 2. This opens a Query Editor pane with code from a basic stored procedure template, the template called Create Stored Procedure (New Menu) to be exact. You can either alter the procedure by changing the template options by clicking Ctrl+Shift+M, or just write the code from scratch. As we have chosen to create a stored procedure via the Object Explorer, we will use the template this time. Figure 10-1 shows the template options that can be changed.
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CHAPTER 10 STORED PROCEDURES
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Figure 10-1. A stored procedure s blank template 3. The first three options, shown in Figure 10-2, are not part of the stored procedure syntax; they are extra options used within the comments of the stored procedure. The first option is very useful because it will probably be a dbo account that adds the stored procedure to the database, and therefore it will be hard to track who the actual creator of the stored procedure was. It may be that only one account releases all the code to production for deployment. The second option, Create Date, is not quite as relevant, as this can be found by interrogating system views. The Description option is excellent and should form part of every stored procedure, as it will allow a short description of what the stored procedure is trying to achieve. Never go into too much detail in a description, because not everyone has good discipline in updating the comments when the stored procedure changes. However, a short we are trying to achieve set of text is perfect.
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Figure 10-2. First set of template options filled 4. We can now move to the template options that form part of the CREATE PROCEDURE syntax. The first option is the name. I have called this apf_insCustomer to define that it s a stored procedure in the ApressFinancial database and that we are inserting a row in the CustomerDetails.Customers table. Then we can insert two parameters, as this is what the template is set up for. The first two parameters will be used to populate CustomerFirstName and CustomerLastName. We will look at the rest in a moment. The parameter values do not have to be the same name as the columns they will be working with, but it is best to have similar names. The data type and data length should be defined as the same type and length as the columns they will be used for. Failure to do this could lead to problems with data truncation if you make the parameter columns too long, for example. We also remove the values in the default options. Your template options should now look similar to what you see in Figure 10-3.
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