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4. Use the drop-down list box at the top to change the selected object. You can
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also double-click any dependent or depending object and SQL Server will display a form showing its dependencies.
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5. Select vEquipment and the program will display the following form. From
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this form, we can conclude that this view is based on two tables and that it is referenced in one stored procedure.
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3: Stored Procedure Design Concepts
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The system stored procedure sp_depends has a similar function. It can also return one or two result sets one for dependent objects and one for depending objects. If you execute the following statement in Query Analyzer,
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exec sp_depends prListLeasedAssets
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you will see a result like that shown in Figure 3-8.
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Figure 3-8
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Dependent and depending objects
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SQL Server 2000 Stored Procedure & XML Programming
The 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.
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 re-create 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, but in SQL Server 7.0 and SQL Server 2000, the problem is even more difficult to manage, because of deferred name resolution. Therefore, if SQL Server displays an empty list, you should open the source code and check it!
Neither of these methods will show you dependencies between objects outside of the current database.
The Role of Stored Procedures in the Development of Database Applications
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 DBA is to maintain the data integrity of the database that he or she is managing. If a DBA is not almost fanatical about data integrity, the results for the database will be potentially disastrous. During my career, I have encountered databases with 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 control data entry, and to implement validation of information and even the most complex constraints.
3: Stored Procedure Design Concepts
Consistent Implementation of Complex Business Rules and Constraints
Transact-SQL stored procedures are powerful enough to implement even the most complex business rules because they can combine both procedural and set-oriented statements. Everything that is too complicated to be implemented using other constraints and that is procedural and not just set-oriented can be implemented in the form of a stored procedure. These are complex and important considerations and will be expanded upon throughout the remainder of this book.
NOTE
Naturally, stored procedures are not the only way to implement business logic on the server. Three-tier architecture envisions implementation of business services on a middleware server.
Modular Design
Stored procedures allow developers to encapsulate business functionality and provide callers with a simple interface. Stored procedures behave like a black box. The caller does not have to know how they are implemented, just what they do, what input is required, and what output will be generated. From a development standpoint, this also reduces the complexity of the design process. You do not need to know how a stored procedure is implemented. You just need to reference it in your application or your own procedures.
Maintainability
System design is a cyclic process. Every system needs to be reviewed, changed, and improved. By hiding database structure details behind stored procedures, database administrators can reduce or hopefully eliminate the need to change all other components (that is, client applications and middleware components) of the system whenever they change the database structure. Microsoft has achieved the same goal with system stored procedures and system tables. Although you can use the contents of system tables directly in your applications, you should base your code on system stored procedures, because Microsoft reserves the right to change tables from version to version but has promised to keep the interface and functionality of stored procedures intact. Another advantage is that stored procedures are implemented on the server and can be maintained centrally. If the business logic is implemented in the client application, a huge effort will be needed to deploy changes.
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