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Editing Stored Procedures in Enterprise Manager
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The easiest way to edit stored procedures is to use Enterprise Manager. All you need to do is to display the Properties window for the stored procedure. 1. Verify that the Stored Procedures branch in the Asset database is still open in Enterprise Manager. 2. Right-click the prHelloWorld_1 stored procedure and select Properties. The Properties window displays the stored procedure code.
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Editing Stored Procedures in Query Analyzer
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Before Enterprise Manager was released in Microsoft SQL Server 6.0, administrators used isql (the ancestor of Query Analyzer) to do most of the work. It is still possible to edit stored procedures in the traditional way using Query Analyzer.
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Traditionally, DBAs included the code for deleting (dropping) the original stored procedure and then recreating the stored procedure (with the changed code): 1. Launch Query Analyzer. 2. Make sure that you are in the Asset database. 3. Type the following code in the Query pane:
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Drop procedure prHelloWorld_1 Go Create procedure prHelloWorld_1 As Select 'Hello Dejan' select * from Inventory Return 0 Go
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4. Execute the code by selecting Execute on the Query menu. SQL Server will first delete the existing stored procedure and then recreate it (with the new code). The trouble with this method (dropping and then recreating) is that you also drop some attributes associated with the stored procedure (such as permissions), which also affects other dependent objects. Since Microsoft SQL Server 7.0, it is possible to use the Alter Procedure statement to modify an existing stored procedure without affecting permissions and other dependent objects:
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Alter Procedure prHelloWorld_1 As Select 'Hello World again!' Select * from Inventory Return 0 Go
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You may have noticed the Go command in the previous two examples. This command is not a SQL statement. It is not even part
SQL Server 2000 Stored Procedure Programming
of the TSQL language. It is a signal to Query Analyzer (and some other tools, such as isql and osql) to treat the SQL statements as one set a batch. All statements in a batch are compiled and executed together. In SQL Server 2000, it is possible to use Object Browser to edit stored procedures: 1. If the Object Browser is not already present on the screen, select Tools | Object Browser to display it. 2. Open the Asset database and then its list of stored procedures. 3. Find and right-click prHelloWorld_1 in the list. Select Edit from the pop-up menu, and Query Analyzer displays a Query window with the code of the stored procedure in it (see Figure 2-16).
Figure 2-16.
The Query window displays the stored procedure s code
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NOTE: Do not be confused by the additional Set statements. They are present just to set an optimal environment for the execution of the Alter Procedure statement. You can ignore them or even delete them.
4. Once you are satisfied with changes in the code, you can simply execute it (Query | Execute).
Syntax Errors
Sooner or later you will make a typo, and the server will react with an error. Let s deliberately cause a problem to see how the server reacts. 1. Verify that you are in Query Analyzer and that Asset is your current database. We will attempt to alter the code of prHelloWorld_1.
NOTE: There are two ways to type comments in the Transact-SQL language. If you type two dashes (- -), the rest of that line will be ignored by the server. Code stretched over multiple lines can be commented out by using (/*) and (*/) as delimiters at either end of the comment.
We will comment out the second line (the keyword As):
Alter Procedure prHelloWorld_1 --As Select 'Hello World again!' Select * from Inventory Return 0 Go
As soon as you execute this code, the server reports an error (see Figure 2-17). Keep in mind that SQL Server is not a perfect compiler. Some error messages that it reports may not contain sufficient details or may even be misleading. The rule of thumb is simple: check your basic syntax first.
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