9: Advanced Stored Procedure Programming in VS .NET

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9: Advanced Stored Procedure Programming
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+ ',' + case when MakeSDX is null then 'null' else '''' + convert(varchar(8000),MakeSDX) + '''' end + ')' from Equipment
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The result is set of Insert statements:
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---------------------------------------------------------------------Insert dbo.Equipment(EquipmentId,Make,Model,EqTypeId,ModelSDX,MakeSDX) values (478,'Trigon', '15 Cart. DLT Library Tabletop Conversion Kit (Beac',1,null,null) Insert dbo.Equipment(EquipmentId,Make,Model,EqTypeId,ModelSDX,MakeSDX) values (394,'Trigon','2KVA Prestige W/Ext full Bat',1,null,null) Insert dbo.Equipment(EquipmentId,Make,Model,EqTypeId,ModelSDX,MakeSDX) values (347,'Trigon', 'DeskSys EN CMT PIII 733 10GB 128MB 48xCD NT',1,null,null) ...
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Using the sp_executesql Stored Procedure
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In 3, you saw that an important advantage stored procedures have over ad hoc queries is their capability to reuse an execution plan. SQL Server, and developers working in it, can use two methods to improve the reuse of queries that are not designed as stored procedures. The first of these is autoparameterization, covered in 3. This section focuses on the second of these methods: using a stored procedure to enforce parameterization of a query. If you know that a query will be re-executed with different parameters and that reuse of its execution plan will improve performance, you can use the sp_executesql system stored procedure to execute it. This stored procedure has the following syntax:
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sp_executesql [@stmt =] stmt [ {, [@params =] N'@parameter_name data_type [,...n]' } {, [@param1 =] 'value1' [,...n] } ]
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The first parameter, @stmt, is a string containing a batch of Transact-SQL statements. If the batch requires parameters, you must also supply their definitions as the second parameter of the sp_executesql procedure. The parameter definition is followed by
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a list of the parameters and their values. The following script executes one batch twice, each execution using different parameters:
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EXECUTE sp_executesql @Stmt = N'SELECT * FROM Asset.dbo.Contact WHERE ContactId = @Id', @Parms = N'@Id int', @Id = 11 EXECUTE sp_executesql @Stmt = N'SELECT * FROM Asset.dbo.Contact WHERE ContactId = @Id', @Parms = N'@Id int', @Id = 313
There is one unpleasant requirement to this exercise. If all database objects are not fully qualified (that is, hard-coded with the database name and object owner), the SQL Server engine will not reuse the execution plan. In some cases, you may be able to ensure that all database objects are fully qualified. However, this requirement becomes a problem if you are building a database that will be deployed under a different name or even if you use more than one instance of the database in your development environment (for example, one instance for development and one for testing). The solution is to obtain the name of a current database using the Db_Name() function. You can then incorporate it in a query:
Declare @chvQuery nvarchar(200) Set @chvQuery = N'Select * From ' + DB_NAME() + N'.dbo.Contact Where ContactId = @Id' EXECUTE sp_executesql @stmt = @chvQuery, @Parms = N'@Id int', @Id = 1 EXECUTE sp_executesql @stmt = @chvQuery, @Parms = N'@Id int', @Id = 313
Solutions based on this stored procedure are better than solutions based on the execution of a character string. The execution plan for the latter is seldom reused. It might happen that it will be reused only when parameter values supplied match those in the execution plan. Even in a situation in which you are changing the structure of a query, the number of possible combinations of query parameters is finite (and some of them are more probable than others). Therefore, reuse will be much more frequent if you force parameterization using sp_executesql.
9: Advanced Stored Procedure Programming
When you use Execute, the complete batch has to be assembled in the form of a string each time. This requirement also takes time. If you are using sp_executesql, the batch will be assembled only the first time. All subsequent executions can use the same string and supply an additional set of parameters. Parameters that are passed to sp_executesql do not have to be converted to characters. That time is wasted when you are using Execute, in which case parameter values of numeric type must be converted. By using all parameter values in their native data type with sp_executesql, you may also be able to detect errors more easily.
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