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with which the extended property will be associated. For this reason, database objects are divided into three levels: 1. User, user-defined type 2. Table, view, stored procedure, function, rule, default 3. Column, index, constraint, trigger, parameter If you want to assign an extended property to an object of the second level, you must also specify an object of the first level. If you want to assign an extended property to an object of the third level, you must also specify an object of the second level. For example, to specify an extended property Format to associate with the column Phone in the table Contact , you must specify the owner of the table:
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Exec sp_addextendedproperty 'Format', '(999)999-9999', 'user', dbo, 'table', Contact, 'column', Phone
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The FN_LISTEXTENDEDPROPERTY function is designed to list the extended properties of an object. It requires that you specify objects in the same manner as the stored procedures do. You can see the resultset returned by the function in Figure 10-8.
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In this chapter, we have demonstrated techniques for the dynamic construction of queries. We have compared different techniques to see how SQL Server reuses execution plans and what effect such reuse has on performance. We have demonstrated the use of timestamp fields to implement optimistic locking in SQL Server and solutions for loading timestamp values into client applications. Microsoft Search Service is a search engine that allows full-text indexing and querying much like the services we use to query the Web. The engine is not relational, but it is possible to use it from stored procedures and Transact-SQL. It gives a new dimension to documents stored in SQL Server databases.
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SQL Server 2000 Stored Procedure Programming
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Figure 10-8.
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Extended properties of an object
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Special attention was paid to the issue of nested stored procedures and the use of cursors and temporary tables to transfer information from outer to inner stored procedures and back. Some implementations require additional work to generate and use unique identifiers for records in tables. Several problems, solutions, and techniques were discussed. Pay special attention to the implementation of looping using Min() and Max() functions. This solution is superior to the use of cursors (better performance, better maintainability, and reduced chance of errors). An interesting new feature is the capability to associate additional attributes called extended properties with database objects. This new feature provides some interesting opportunities. For example, it is possible to manage some application behaviors using data from a single source within the database.
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10:
Advanced Stored Procedure Programming
EXERCISES
1. Create a pair of stored procedures that use optimistic locking to obtain and update a record in the Inventory table. Assume that the client application cannot handle the timestamp datatype and that you have to use the money datatype instead. 2. Take a stored procedure from exercises 7 and 12 in 4 and exercise 6 in 7 and return the results in a single resultset. 3. Create a new version of the prGetInventoryProperties stored procedure that uses a While statement with a Min() function.
Interaction with the SQL Server Environment
Terms of Use
SQL Server 2000 Stored Procedure Programming
his chapter focuses on the ways you can use system and extended stored procedures to interact with the SQL Server environment. It also discusses the ways user-defined stored procedures can help you leverage the existing functionality of various elements within the SQL Server environment. By the end of this chapter you will be able to
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Use OLE Automation in Transact-SQL Run programs and operating system commands from the command shell Manage jobs in Job Scheduler Read and write Registry entries Install a database on another server Use the e-mail capabilities of SQL Server to notify users of events on the server Use the e-mail capabilities of SQL Server to send queries, process them, and receive resultsets Publish the contents of the database on the Web Perform some administration tasks with stored procedures Manage application security
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