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SQL Server 2000 Stored Procedure Programming
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BASIC OPERATIONS WITH STORED PROCEDURES
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This section will serve as a primer to introduce you to the concepts of executing, creating, and editing stored procedures. We will walk through the usage of the most important SQL Server client tools. Since Transact-SQL is just another programming language, we will follow a tradition first established by an unknown programmer and start with a trivial Hello World example.
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Execution of Stored Procedures from Query Analyzer
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The execution of stored procedures from Enterprise Manager or Query Analyzer is very simple. Let s try it using the system stored procedure sp_who, which lists all users and processes connected to the system.
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Relational Database Concepts and the SQL Server Environment
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1. Run Query Analyzer (Start | Programs | Microsoft SQL Server 2000 | Query Analyzer). The Query Analyzer application will prompt you for a server, Login Name, and Password, as shown in the following illustration. If the application is unable to connect to the server, you should check whether the Microsoft SQL Server service is running and whether you correctly typed the name of the server and/or your login name and password.
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TIP: If you have not changed the server since installation, you can use sa as the Login Name and an empty string (blank) as the Password. The name of your machine is the name of the SQL Server. If you are working on the machine that has SQL Server installed, you can always use (local) or a simple dot . to refer to the current machine as the server to which you want to connect.
2. Once you have logged in successfully, the application opens the Query window that you use to write code. In the Query pane, type the following code:
exec sp_who
3. To run the stored procedure, you can select Execute from the Query menu, click the green arrow on the toolbar, or press CTRL-E. The application will split the screen to display both query and results (see Figure 2-9).
SQL Server 2000 Stored Procedure Programming
Figure 2-9.
Execution of stored procedures from Query Analyzer
You can click the Messages tab to see whether SQL Server has returned any messages along with the result (such as the number of records, a warning, or an error). This stored procedure lists active processes on the current server and the login names of the users who started them. 4. Select Query | Results in Text and then execute the query again (Query | Execute). Query Analyzer displays the resultset in the form of text. Messages are mixed with resultsets in this case, which is the way in which Query Analyzer has always worked in past versions (see Figure 2-10).
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Figure 2-10.
Results in Text
NOTE: Before we continue, please ensure that you have installed the sample Asset database. If you have not already installed it, go to 1 and follow the download and installation instructions.
You can also use Object Browser in Query Analyzer to list, execute, and edit stored procedures: 1. If the Object Browser is not already present on the screen, click Tools | Object Browser to display it (see Figure 2-11). 2. Open the node that contains the master database and then the node for that database s stored procedures. Right-click the stored procedure sp_who in the list. Select Open from the
SQL Server 2000 Stored Procedure Programming
Figure 2-11.
The Object Browser
pop-up menu. Query Analyzer prompts you to specify parameters and execute the stored procedure:
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3. Click Execute and Query Analyzer opens a new Query window with code supporting the execution of the stored procedure. The code is executed automatically (see Figure 2-12).
Managing Stored Procedures from Enterprise Manager
Enterprise Manager is the most important tool in the arsenal of the DBA. 1. Start Enterprise Manager (Start | Programs | Microsoft SQL Server 2000 | Enterprise Manager). In some cases, for example
Figure 2-12.
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