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1. Open SQL Server Books Online and find documentation about the sp_spaceused system stored procedure. Execute it to find out the amount of space used by the Asset database. 2. Create a stored procedure prListEquipment to return a list of equipment defined in the Equipment table of the Asset database. 3. Change the stored procedure prListEquipment so that its resultset includes equipment type in the form of text. See the following diagram:
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4. Execute the stored procedure prListEquipment.
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SQL Server 2000 Stored Procedure Programming
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tored procedures are database objects that encapsulate collections of Transact-SQL statements on the server for later repetitive use. They are the equivalent of subroutines and functions in other programming languages. Upon completion of this chapter you will be able to
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Create a stored procedure Explain the elements of a stored procedure List ways to return information from a stored procedure Pass input parameters to a stored procedure Receive output parameters from a stored procedure Receive a return value from a stored procedure Explain where stored procedures are stored on SQL Server Explain the compilation and reuse of stored procedures
ANATOMY OF A STORED PROCEDURE
We can describe a stored procedure in terms of
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Composition Functionality Syntax
Composition
Logically, a stored procedure consists of
A header that defines the name of the stored procedure, the input and output parameters, and some miscellaneous processing options. You can think of it as an API (application programming interface) or declaration of the stored procedure. A body that contains one or more Transact-SQL statements to be executed at runtime.
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Stored Procedure Design Concepts
Creating Stored Procedures
Let s look at the simplified syntax for implementing the core functionality of stored procedures:
CREATE PROC[EDURE] procedure_name [ {@parameter data_type} [= default] [OUTPUT] ] [,...n] AS
sql_statement [...n]
The following is an example of a stored procedure:
Create Procedure GetEquipment @Type varchar(50) as Select * from Equipment where Type = @Type
This Transact-SQL statement creates a stored procedure named GetEquipment with one input parameter. During execution, GetEquipment returns a resultset containing all records from the Equipment table having a Type equal to the input parameter. The unusual characteristic of stored procedures is their physical design. Stored procedures are actually Transact-SQL statements for creating stored procedures. In all other programming languages, procedures just list actions. They do not create anything. In this sense, stored procedures actually create themselves.
NOTE: Please, be patient and do not run anything against the Asset database yet.
If you try to create a stored procedure that already exists in the database, SQL Server will report an error. You can reproduce such an error if you run the same statement for creating a stored procedure twice. For example:
Server: Msg 2729, Level 16, State 5, Procedure GetEquipment, Line 3 Procedure 'GetEquipment' group number 1 already exists in the database. Choose another procedure name.
SQL Server 2000 Stored Procedure Programming
As we have shown in 2, one way to change a stored procedure is to create it again. There are two ways to prevent the error just described. One way is to use an Alter Procedure statement to change the stored procedure. We will explain this technique in the next section. The traditional way to prevent this error is to delete (Drop) a stored procedure and then create it again:
Drop Procedure GetEquipment go Create Procedure GetEquipment @EqTypeId int as Select * from Equipment where EqTypeId = @EqTypeId go
If you are not sure whether a stored procedure exists, you can write a piece of code to check for its existence. If you do not, SQL Server will report an error when you try to drop a stored procedure that does not exist. This code takes advantage of the fact that SQL Server records each database object in the sysobjects table (see Storing Stored Procedures later in this chapter). It also uses programming constructs we have not yet introduced in this book. For now, do not worry about the details. All will become clear later.
if exists (select * from sysobjects where id = object_id('GetEquipment ') and OBJECTPROPERTY(id, 'IsProcedure') = 1) drop procedure GetEquipment GO Create Procedure GetEquipment @EqTypeId int as Select * from Equipment where EqTypeId = @EqTypeId go
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