C h a p t e r 8 : S p e c i a l Ty p e s o f P r o c e d u r e s in .NET

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C h a p t e r 8 : S p e c i a l Ty p e s o f P r o c e d u r e s
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) * (select d.low from master.dbo.spt_values d where d.number = 1 and d.type = 'E' ), 0) as [DATA] , Coalesce( ((select sum(reserved) from sysindexes i1 where i1.id = obj.id and i1.indid in (0, 1, 255) ) - ( (select sum(dpages) from sysindexes where indid < 2 and id = obj.id ) + (select isnull(sum(used), 0) from sysindexes where indid = 255 and id = obj.id) ) ) * (select d.low from master.dbo.spt_values d where d.number = 1 and d.type = 'E') , 0) as [INDEX] from sysobjects obj where obj.xtype in ('U', 'V') and permissions(obj.id) != 0 order by db_name(), user_name(obj.uid), obj.name
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The view has a very complex structure, but its use is very simple. You just need to reference a table in a SQL statement (see Figure 8-19).
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Performance Improvement
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Views are often used as a mechanism for improving system performance. When an index is added to the view, SQL server typically does not have to query and join underlying tables the request will be satisfied using data from the indexed view. Unfortunately, this feature can also degrade overall performance if the system is mostly modifying underlying tables. Distributed partitioned views can divide the execution of workload between servers and provide an exciting new way to linearly scale out the performance of the system. Unfortunately, this is not a magic bullet either if typical queries need data from multiple servers, performance may be degraded.
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CHAPTER
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Advanced Stored Procedure Programming
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IN THIS CHAPTER:
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Dynamically Constructed Queries Optimistic Locking Using timestamp Values Full-Text Search and Indexes Nested Stored Procedures Using Identity Values GUIDs A While Loop with Min() or Max() Functions Looping with sp_MSForEachTable and sp_MSForEachDb Property Management
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SQL Server 2000 Stored Procedure & XML Programming
his chapter introduces some advanced techniques for coding stored procedures, including
Dynamically constructed queries Optimistic locking using timestamp values Full-text searches and indexes Nested stored procedures Temporary tables Parameterized queries Inserting the results of a stored procedure into a table Techniques for generating unique identifiers and potential problems associated with their use The uniqueidentifier (GUID) data type Additional looping methods Property management using extended properties
Dynamically Constructed Queries
This section examines some ways in which you can construct queries dynamically, including Executing a string statement Querying by form Using parameterized queries
Executing a String
Transact-SQL contains a variation of the Execute statement that you can use to run a batch recorded in the form of a character string:
EXEC[UTE] ({@string_variable | [N]'tsql_string'} [+...n])
You can supply a Transact-SQL batch in the form of a character string, a variable, or an expression:
9: Advanced Stored Procedure Programming
Exec ('select * from Contact')
The Execute statement allows you to assemble a batch or a query dynamically. This might look like magic to you:
declare @chvTable sysname set @chvTable = 'Contact' Exec ('select * from ' + @chvTable)
The Execute statement is necessary because the following batch, which you might expect to work, will actually result in a syntax error:
declare @chvTable sysname set @chvTable = 'Contact' select * from @chvTable -- this will cause an error
The error occurs because SQL Server expects a table name, and will not accept a string or a variable, in a From clause. It is important to realize that you are dealing with two separate batches in the example with the Execute statement. You can use the variable to assemble the second batch, but you cannot reference variables from the batch that initiated the Execute statement in the string batch. For example, the following code will result in a syntax error:
declare @chvTable sysname set @chvTable = 'Contact' Exec ('select * from @chvTable')
The server will return:
Server: Msg 137, Level 15, State 2, Line 1 Must declare the variable '@chvTable'.
NOTE
Even if you were to declare the variable in the second batch, the Select statement would fail because you cannot use a string expression or variable in the From clause.
You cannot use a database context from the other batch, either:
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