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SQL Server 2000 Stored Procedure Programming
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if you have never opened Enterprise Manager before, you will have to register the first server with which you will work:
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2. Again, you need to provide the name of the server, your Login Name, and your Password. You can accept default values for the Server Group and all other Options. If the connection parameters are correct, Enterprise Manager will display a window for managing SQL Server. 3. Click the + symbol to expand the SQL Server Group branch. 4. Expand your server branch (again, click the + symbol). 5. Expand the Databases branch. 6. Expand the Asset sample database. 7. Click Stored Procedures and watch as a list of stored procedures is displayed in the Details pane (see Figure 2-13).
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The list of stored procedures in Enterprise Manager
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8. In this list, find a stored procedure named prGetEqId. If you right-click a stored procedure, a pop-up menu appears with options to let you perform operations such as deleting and renaming the stored procedure or creating a new stored procedure. At this point, the most interesting option on this pop-up menu is the Properties option. 9. Right-click the prGetEqId stored procedure, then select Properties on the pop-up menu. The application will open a window to allow you to view and edit the stored procedure (see Figure 2-14). See the sidebar The Structure of Stored Procedures for more information.
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NOTE: Don t worry. In the following chapters, we will give you detailed descriptions of all these objects and their components.
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SQL Server 2000 Stored Procedure Programming
The Structure of Stored Procedures
We will pause a minute to explain the structure of a stored procedure. The prGetEqId stored procedure encapsulates a relatively simple Select statement for later use. It returns a recordset containing values from the EquipmentId column. The recordset will contain only records with the specified Make and Model. The code of a stored procedure consists of a header and a body. The header of the stored procedure defines external attributes of the stored procedure its name and a list of one or more parameters. The prGetEqId stored procedure has two parameters. Parameter names must start with the @ character. The developer must also define a datatype for each parameter. The header must begin with the Create Procedure keyword and finish with the As keyword. The body of the stored procedure contains the Transact-SQL statements to be executed when the stored procedure runs. In this case, there is just one Select statement using the procedure parameters.
Figure 2-14.
Properties of a stored procedure
2:
Relational Database Concepts and the SQL Server Environment
10. Close the Properties window. 11. Right-click any stored procedure in the list and select New Stored Procedure from the pop-up menu. Enterprise Manager displays a Properties window with a template for the stored procedure (see Figure 2-15). 12. Replace the template with the following code:
Create procedure prHelloWorld_1 As Select 'Hello world' Select * from Inventory
13. Click the Check Syntax button to verify the syntax of the procedure. 14. Click OK. The procedure is compiled and stored in the database. You will be able to see it in the list of stored procedures.
Figure 2-15.
A template for the New Stored Procedure
SQL Server 2000 Stored Procedure Programming
NOTE: Earlier versions of Enterprise Manager did not display the stored procedure in the list automatically. The user had to refresh the screen by right-clicking the database name and selecting Refresh from the menu. This scenario still arises on occasion. For example, if you create a stored procedure (or change something in the database) using some other tool, you will need to refresh the list in Enterprise Manager.
You can switch to Query Analyzer to run the newly created stored procedure: 1. On the Tools menu, select SQL Server Query Analyzer, switch to the Asset database, and type the following code:
Exec prHelloWorld_1
When you execute this code in the Query Analyzer, the application runs the stored procedure and displays the Hello World message and a list of records from the Inventory table. 2. Close Query Analyzer.
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