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SQL Server 2000 Stored Procedure Programming
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stored procedures. You should flush the procedure cache to force all dependent stored procedures (which refer to the stored procedure by its old name) to recompile. You can use DBCC FREEPROCCACHE, or you can simply restart SQL Server and the procedure cache will be emptied.
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To delete a stored procedure from Enterprise Manager: 1. Right-click the name of the stored procedure in the list. 2. Select Delete from the pop-up menu. It is also simple to delete a stored procedure using Object Browser in Query Analyzer: 1. Right-click the name of the stored procedure in the list. 2. Select Delete from the pop-up menu. Drop Procedure is a Transact-SQL statement for deleting a stored procedure. To use it, you must supply the name of the stored procedure as a parameter:
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If you plan to perform some dramatic action such as deleting or renaming a database object, you should first investigate which objects will be affected by it. Microsoft SQL Server keeps a list of dependencies between objects in the sysdepends system table in each database. To view this list in Enterprise Manager: 1. Right-click the name of the database object. 2. Select All Tasks. 3. Click Display Dependencies and SQL Server will display a list of dependencies:
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The program displays two lists. The list to the left shows objects that reference the selected object (dependent). The list to the right shows objects that are referenced by the object (depending). In the case of prListInventoryEquipment, since no object in the database is using it, the list to the left is empty. Use the drop-down list box at the top to change the selected object; after a short delay, the program displays its dependencies. You can also double-click any dependent or depending object and SQL Server will display a form showing its dependencies. Select vEquipment and the program will display the following form. From this form, we can conclude that this view is based on two tables and that it is used in one stored procedure:
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SQL Server 2000 Stored Procedure Programming
The system stored procedure sp_depends has a similar function. It can also return one or two resultsets one for dependent and one for depending objects. If you execute the following statement in Query Analyzer,
exec sp_depends prListLeasedAssets
you will see a result like that in Figure 3-8. Object Browser can also be used to display a list of dependencies: 1. Expand the node of a database object (for example, the prListLeasedAssets stored procedure). 2. Expand the Dependencies node.
Figure 3-8.
Dependent and depending objects
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NOTE: Unfortunately, you cannot completely rely on SQL Server to get a list of dependencies. It does not update the content of the sysdepends table in all cases. You can reproduce and observe this behavior when, for example, you drop and recreate a table. However, in that case SQL Server will warn you that it cannot properly update sysdependencies. This problem has been a known issue since version 4.21. If SQL Server displays an empty list, you should open the source code and check it.
THE ROLE OF STORED PROCEDURES IN THE DEVELOPMENT OF DATABASE APPLICATIONS
In order to properly design and use stored procedures in the development of applications, it is critical to understand their role and advantages.
Enforcement of Data Integrity
The most important task for each database administrator is to maintain the data integrity of the database that he or she is managing. If he or she is not almost fanatical about data integrity, the results for the database will be potentially disastrous. During my career, I have encountered databases with
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106 different provinces of Canada (one of them was France) An Address column filled with Guest had frozen Fish. Nine ways to write HP LaserJet III
Stored procedures are an ideal tool to help you standardize and limit database access, and to implement validation of information and even the most complex constraints.
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