9: Advanced Stored Procedure Programming in VS .NET

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9: Advanced Stored Procedure Programming
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-- return non-selected Select name non_selected From #setable Where name not in ( Select name From #current ) Drop Table #setable Drop Table #current Return 0
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The only trouble with this method is that you need to know the structure of the result set of the stored procedure in advance in order to create a table with the same structure, although this is not a problem for user-defined stored procedures. It used to be a problem for system stored procedures, but SQL Server Books Online now provides information regarding the result sets generated by these stored procedures.
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Unfortunately, it is not possible to capture the contents of a result set if a stored procedure returns more than one result set, as is the case with sp_spaceused when no table name is specified.
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This technique also works with the Exec statement. For example, if you try to collect a result set from the DBCC command in this way, SQL Server will return an error. But you can encapsulate the DBCC statement in a string and execute it from Exec. The following stored procedure returns the percentage of log space used in a specified database:
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Create Procedure prLogSpacePercentUsed -- return percent of space used in transaction log for -- specified database ( @chvDbName sysname, @fltPercentUsed float OUTPUT ) As Set Nocount On Declare @intErrorCode int Set @intErrorCode = @@Error
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SQL Server 2000 Stored Procedure & XML Programming
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If @intErrorCode = 0 Begin Create Table #DBLogSpace ( dbname sysname, LogSizeInMB float, LogPercentUsed float, Status int ) Set @intErrorCode = @@Error End -- get log space info. for all databases If @intErrorCode = 0 Begin Insert Into #DBLogSpace Exec ('DBCC SQLPERF (LogSpace)') set @intErrorCode = @@Error end -- get percent for specified database if @intErrorCode = 0 begin select @fltPercentUsed = LogPercentUsed from #DBLogSpace where dbname = @chvDbName set @intErrorCode = @@Error end drop table #DBLogSpace return @intErrorCode
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You can test this stored procedure from Query Analyzer, as shown on Figure 9-6. These techniques were extremely important before SQL Server 2000. It is now possible to use the table data type as a return value for user-defined functions. You learned how to use table-valued user-defined functions in 8. Unfortunately, it is still not possible to use a table variable as the output parameter of a stored procedure. You have another option available when you want to pass a result set (or multiple result sets) to a calling stored procedure you can use the cursor data type as the output parameter of a stored procedure. In the following example,
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9: Advanced Stored Procedure Programming
Figure 9-6
Percentage of log space used in specified database
prGetInventoryProperties_CursorGet creates and opens a cursor. The content of the cursor is then returned to the calling procedure.
Create Procedure prGetInventoryProperties_CursorGet -- Return Cursor that contains properties -- that are describing selected asset. ( @intInventoryId int, @curProperties Cursor Varying Output ) As Set @curProperties = Cursor Forward_Only Static For Select Property, Value, Unit From InventoryProperty inner join Property
SQL Server 2000 Stored Procedure & XML Programming
On InventoryProperty.PropertyId = Property.PropertyId Where InventoryProperty.InventoryId = @intInventoryId Open @curProperties Return 0
The preceding stored procedure will be called from the following stored procedure:
Create Procedure prGetInventoryProperties_UseNestedCursor -- return comma-delimited list of properties -- that are describing asset. -- i.e.: Property = Value unit;Property = Value unit; -- Property = Value unit;Property = Value unit;... ( @intInventoryId int, @chvProperties varchar(8000) OUTPUT, @debug int = 0 ) As Declare @intCountProperties int, @intCounter int, @chvProperty varchar(50), @chvValue varchar(50), @chvUnit varchar(50), @insLenProperty smallint, @insLenValue smallint, @insLenUnit smallint, @insLenProperties smallint Set @chvProperties = '' Declare @CrsrVar Cursor Exec prGetInventoryProperties_CursorGet @intInventoryId, @CrsrVar Output Fetch Next From @CrsrVar Into @chvProperty, @chvValue, @chvUnit While (@@FETCH_STATUS = 0)
9: Advanced Stored Procedure Programming
Begin Set @chvUnit = Coalesce(@chvUnit, '') If @debug <> 0 Select @chvProperty Property, @chvValue [Value], @chvUnit [Unit] -- check whether new string will fit Select @insLenProperty = DATALENGTH(@chvProperty), @insLenValue = DATALENGTH(@chvValue), @insLenUnit = DATALENGTH(@chvUnit), @insLenProperties = DATALENGTH(@chvProperties) If @insLenProperties + 2 + @insLenProperty + 1 + @insLenValue + 1 + @insLenUnit > 8000 Begin Select 'List of properties is too long (over 8000 chrs)!' Return 1 End -- assemble list Set @chvProperties = @chvProperties + @chvProperty + '=' + @chvValue + ' ' + @chvUnit + '; ' If @debug <> 0 Select @chvProperties chvProperties Fetch Next From @CrsrVar Into @chvProperty, @chvValue, @chvUnit End Close @CrsrVar Deallocate @CrsrVar Return 0
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