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Stored Procedure Design Concepts
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NOTE: Most of stored procedures in this book already exist in the database. If you just try to create them, SQL Server will complain. If you are sure that the code that you have typed is correct, you can drop the original stored procedure and put yours in its place. Or you can alter the original stored procedure and use your code instead. It is much better to rename your stored procedure. All stored procedures in the Asset database start with the pr prefix. You could start yours, for example, with up ( user procedure ). I follow a similar practice when I create several versions of the same stored procedure to illustrate a point or a technique. I merely change the stored procedure s suffix by adding a version number (for instance, _1, _2).
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Altering Stored Procedures
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The other way to change a stored procedure is to use the Alter Procedure statement:
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Alter Procedure GetEquipment @EqTypeId int as Select * from Equipment where EqTypeId = @EqTypeId go
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The syntax of this statement is identical to the syntax of the Create Procedure statement (except for the keyword). The main reason for using this statement is to avoid undesirable effects on permissions and dependent database objects. Earlier versions of Enterprise Manager provided a workaround for permissions problems by executing code that recreates all permissions. For more details about permissions, see 11. The Alter Procedure statement preserves all aspects of the original stored procedure. The Object_id of the procedure from the sysobjects statement remains the same, and all references to the stored procedure are intact. For more details about the sysobjects table and the Object_id column, see Storing Stored Procedures later in this chapter.
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SQL Server 2000 Stored Procedure Programming
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Limits
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When you are creating or changing a stored procedure, you should keep in mind the following limits:
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The name of the procedure is a standard Transact-SQL identifier. The maximum length of any identifier is 128 characters. Stored procedures may contain up to 1,024 input and output parameters. The body of the stored procedure consists of one or more Transact-SQL statements. The maximum size of the body of the stored procedure is 128MB.
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Functionality
One of the main purposes of a stored procedure is to return information from the SQL Server database in a usable form. There are three ways to receive information from a stored procedure:
w s v
Resultset Parameters Return value
Returning Resultsets
To obtain a resultset from a stored procedure, insert a TransactSQL statement that returns a resultset into the body of the stored procedure. You will usually insert a Select statement, but you could also insert a call to another stored procedure. It is also possible to return several resultsets from one stored procedure. Such a stored procedure will simply contain several Select statements. You should note that some client data access methods such as RDO can access all resultsets, but others will receive just the first one or possibly even report an error.
3:
Stored Procedure Design Concepts
Input and Output Parameters
Let s add a new procedure to the Asset database:
Create procedure prGetEqId @Make varchar(50), @Model varchar(50) as select EquipmentId from Equipment where Make = @Make and Model = @Model
This is a very simple stored procedure. It uses two input parameters to receive the Make, Model, and return identifiers of equipment that matches the specified make and model. Physically, the stored procedure encapsulates just one Select statement. The header and body of the procedure are divided by the keyword As. The header of the stored procedure contains a list of parameters delimited with a comma ( , ) character. Each parameter is defined with an identifier and a datatype. Parameter identifiers must begin with the at sign (@). You can use the following statement to execute the stored procedure:
Execute prGetEqId 'Toshiba', 'Portege 7020CT'
The keyword Execute is followed by the name of the stored procedure. Since the stored procedure requires two parameters, they are provided in the form of a comma-delimited list. In this case, they are strings, so they must be delimited with single quotation marks. The keyword Execute is not needed if the stored procedure is executed in the first statement of a batch.
prGetEqId 'Toshiba', 'Portege 7020CT'
However, I recommend you use it. It is a good habit that leads to clean code. You can use its shorter version (Exec) to save keystrokes:
Exec prGetEqId 'Toshiba', 'Portege 7020CT'
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