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Both management and developers must maintain reason in the introduction of standards with a view to preventing rigid and inflexible enforcement and establishing meaningful conventions Names should describe the contents of a variable, object, action, or procedure Although SQL Server supports identifiers of up to 128 characters in length, the practical range is 8 to 15 characters for variables and 20 to 40 characters for stored procedures Imprecise names will misdirect the reader, and they are usually a symptom of a poorly designed stored procedure or an unclear purpose for an object or variable Although a development team can decide to follow some formal convention such as Hungarian notation, even simple informal conventions will serve the purpose.

The introduction of a standard becomes critical when multiple developers are working on a project, when the code will be maintained by developers other than those on the project team, or when the development project is too complex for one person to hold in his or her head in its entirety This chapter presents a simple convention designed specifically for use in Transact-SQL statements..

his chapter examines other types of procedures available in the SQL Server environment. Some of these procedures are just special types of stored procedures and others are completely different types of database objects. However, they all share a common attribute: that is, they are used to describe or implement an algorithm for the purpose of achieving some result.

There are six types of stored procedures: User-defined System Extended Temporary Global temporary Remote

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The same functionality could be achieved even without a local variable, since a Return statement can accept an integer expression instead of an integer value:

As you may infer from the name, user-defined stored procedures are simply groups of Transact-SQL statements assembled by administrators or developers for later repetitive use. The design of this type of stored procedure is the primary focus of this book.

Microsoft delivers a vast set of stored procedures as a part of SQL Server. They are designed to cover all aspects of system administration. Before Microsoft SQL Server 6.0, administrators had to use scripts from isql to control the server and their databases. Although administrators

9:

Both Named Pipes and RPC services in Windows 2000 support impersonation of security contexts to provide an integrated logon capability (also known as Windows NT/2000 Authentication) That is, instead of requiring a separate user ID/password logon each time a connection to SQL Server is requested, SQL Server can impersonate the security context of the user running the application that requests the connection If that user has sufficient privileges (or is part of a Windows NT/2000 domain group that does), the connection is.

today customarily use Enterprise Manager, stored procedures are still very important, since Enterprise Manager uses the same system stored procedures, through SQL-DMO, behind the scenes.

NOTE: SQL-DMO stands for SQL Distributed Management Objects. It is a collection of objects designed to manage the SQL Server environment. You can use it to create your own Enterprise Manager or automate repetitive tasks. It is interesting that it does not support the return of a recordset to the caller. You should use other objects (such as ADO) to achieve this result.

System stored procedures are stored in the system databases (master and msdb), and they have the prefix sp_. This prefix is more than just a convention. It signals to the server that the stored procedure is located in the master database and that it should be accessible from all databases without the user s needing to insert the database name as a prefix to fully qualify the name of the procedure:

Create Procedure prGetEqId_3 @chvMake varchar(50), @chvModel varchar(50) as Return (select EquipmentId from Equipment where Make = @chvMake and Model = @chvModel)

It also signals to the server that the stored procedure should be executed in the context of the current database. For example, the script shown in Figure 9-1 will return information about the current database, and not the master.

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