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If the stored procedure statement has parameters, you must supply values for the parameters in your Exec statement. If a user fails to supply them, the server reports an error. It is possible, however, to assign default values to the parameters so that the user is not required to supply them. Default values are defined at the end of a
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SQL Server 2000 Stored Procedure Programming
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parameter definition; behind the datatypes. All that is needed is an assignment (=) and a value. Add this new procedure to the Asset database:
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Create Procedure prGetEqId_4 @Make varchar(50) = '%', @Model varchar(50) = '%' as Select * from Equipment where Make Like @Make and Model Like @Model
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The procedure is designed as a small search engine that accepts TSQL wild cards. You can execute this stored procedure with normal values:
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Execute prGetEqId_4 'T%', 'Portege%'
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The resultset will consist of records that match the criteria:
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EquipmentId Make 1 Toshiba Model Portege 7020CT EqTypeId 1 ----------- ---------------------- ------------------------ --------
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(1 row(s) affected)
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If one parameter is omitted, the procedure will behave, since the value that was defined as a default has been supplied.
Execute prGetEqId_4 'T%'
The server will return a resultset:
EquipmentId Make 1 Toshiba Model Portege 7020CT EqTypeId 1 ----------- ---------------------- ------------------------ --------
(1 row(s) affected)
Even both parameters may be skipped:
Execute prGetEqId_4
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Stored Procedure Design Concepts
The server will return all records that match the default criteria:
EquipmentId Make 1 2 Toshiba Sony Model Portege 7020CT Trinitron 17XE EqTypeId 1 3 ----------- ---------------------- ------------------------ --------
(2 row(s) affected)
Passing Parameters by Name
At this point, you might wonder if it is possible to supply only the second parameter. There is a mechanism that you can use to do exactly that. In order to achieve this goal, you must type the name of the parameter and then assign a value to it. The parameter name must match its definition. It has to include everything, even the @ sign. Once this is accomplished, it is not necessary to follow the parameter order. This method is sometimes called passing parameters by name. The original method can be referred to as passing parameters by position. In the following example, the server will use T% for the second parameter and a default value, %, for the first one:
Execute prGetEqId_4 @Model = 'T%'
The result of the search will be:
EquipmentId Make 2 Sony Model Trinitron 17XE EqTypeId 3 ----------- ---------------------- ------------------------ --------
(1 row(s) affected)
The opportunity to skip parameters is just one reason for passing parameters by name. Even more important is the opportunity to create a method that makes code more readable and maintainable. And, if a developer makes a mistake and assigns a value to a nonexisting parameter, the error will be picked up by SQL Server. Although passing parameters by position can be a little faster, passing parameters by name is preferable.
SQL Server 2000 Stored Procedure Programming
Syntax
The following is the complete syntax for the creation of a stored procedure:
CREATE PROC[EDURE] procedure_name [;number] [ {@parameter data_type} [VARYING] [= default] [OUTPUT] ] [,...n] [WITH { RECOMPILE | ENCRYPTION | RECOMPILE, ENCRYPTION } ] [FOR REPLICATION] AS
sql_statement [...n]
When you create a stored procedure using With Encryption, the code of the stored procedure is encrypted and then saved in the database. SQL Server will be able to use the encrypted version of the source code to recompile the stored procedure when needed, but none of the users (not even the system administrator) will be able to obtain it. Keep in mind that you will not be able to change a stored procedure if you forget to preserve its code. For more details about storage and encryption of stored procedures, see Storing Stored Procedures later in this chapter. As a developer, you might decide to recompile a stored procedure each time it is used. To enforce compilation, you should create the stored procedure using With Recompile. Recompiling for each use may improve or degrade the performance of the stored procedure: although the compilation process is extra overhead when you are executing the stored procedure, SQL Server will sometimes recompile the stored procedure differently (and more economically) based on the data it is targeting. You will find more details about compilation and reasons for recompiling a stored procedure later in this chapter.
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