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Temporary Stored Procedures
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Temporary stored procedures are related to stored procedures as temporary tables are to tables. You will use them when you expect to reuse the execution plan of a stored procedure within a limited time frame. Although you can achieve the same functionality with a standard user-defined stored procedure, temporary stored procedures are a better solution, because you do not have to worry about maintenance issues (such as dropping the stored procedure). Temporary stored procedures reside in the tempdb and must have the prefix # . You create them in the same manner as you do user-defined stored procedures. The only change is the use of a # as a name prefix. This prefix signals the server to create the procedure as a temporary stored procedure. This kind of stored procedure can only be used from the session in which it was created. When the session is closed, it will be dropped automatically. This behavior indicates why this type of stored procedure is often also referred to as a private temporary stored procedure.
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Create Procedure #GetId @Make varchar(50), @Model varchar(50) as Select EquipmentId from Equipment where Make = @Make and Model = @Model
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Sometimes administrators refer to user-defined stored procedures in tempdb as temporary stored procedures. This equation is incorrect, since there are major differences between the two. For example, user-defined stored procedures in tempdb are accessible to all authorized users. These stored procedures stay in tempdb until the server is shut down. At that time, the complete content of tempdb is flushed.
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Global temporary stored procedures are related to temporary stored procedures as global temporary tables to private temporary tables. They also reside in tempdb, but they use the prefix ## . You create them in the same manner as you do temporary stored procedures. The only difference is that they are visible and usable from all sessions. In fact, permissions are not required and the owner cannot even deny other users access to them. When the session that has created the procedure is closed, no new sessions will be able to execute the stored procedure. After all instances of the stored procedure already running are finished, the procedure is dropped automatically.
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Create Procedure ##InsertEquipment @Make varchar(50), @Model varchar(50), @EqType varchar(50) as declare @EqTypeId smallint select @EqTypeId = EqTypeId from EqType Where EqType = @EqType -- This is OK in perfect world, -- but it is based on -- unreasonable assumption.
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Insert Equipment (Make, Model, EqTypeId) Values (@Make, @Model, @EqTypeId)
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Remote Stored Procedures
This type is actually a user-defined stored procedure that resides on a remote server. The only challenge implicit in this type of stored procedure is that the local server has to be set to allow the remote use of stored procedures. For more information, search SQL Server Books Online using the following string: How to set up a remote server to allow the use of remote stored procedures.
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Special Types of Procedures
TIP: Microsoft, in fact, considers this mechanism as a legacy of older versions of SQL Server. Heterogeneous queries are the recommended way to execute stored procedures or access tables on other servers.
USER-DEFINED FUNCTIONS
The ability to design Transact-SQL functions is a new feature in SQL Server 2000. In earlier versions, users were only able to use built-in functions.
Design of User-Defined Functions
User-defined functions can be created using the Create Function statement, changed using Alter Function, and deleted using Drop Function. You can use sp_help and sp_stored_procedures to get information about a function, and sp_helptext to obtain its source code. From Enterprise Manager, the administrator can use the same tools used to create and manage stored procedures. Functions can have zero, one, or more parameters. They must return a single return value. The returned value can be scalar, or it can be a table. Input parameters can be values of any datatype except timestamp, cursor, and table. Return values can be of any datatype except timestamp, cursor, text, ntext, and image. The Create Function statement has the following syntax:
Create Function [owner_name.]function_name ( [ {@parameter_name scalar_data_type [= default]} [,...n] ] ) returns scalar_data_type |Table |return_variable Table({column_def|table_constraint}[, n]) [With {Encryption|Schemabinding}[, n] ] [As] {Begin function_body End} | Return [(] {value|select-stmt} [)]
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