barcode generator vb.net free 9: Advanced Stored Procedure Programming in .NET framework

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9: Advanced Stored Procedure Programming
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+ @chvKeywords + ')') else if @inySearchType = @c_FormsOf exec ('select * from Activity ' + 'Where FreeText(Note, FORMSOF(INFLECTIONAL,' + @chvKeywords + ')') Return
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Full-text search has additional features related to the use of ContainsTable and FreeText table and the use of the Formsof, Near, and Weight keywords, but the description of these features is beyond the scope of this chapter and this book.
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Nested Stored Procedures
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Nested stored procedures are simply stored procedures that were called by other stored procedures. Using SQL Server 2000, it is possible to do 32 levels of nesting. You can investigate current nesting level using the @@nestlevel function. This section explores methods for passing recordsets between a nested stored procedure and its caller.
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Using Temporary Tables to Pass a Recordset to a Nested Stored Procedure
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Some programming languages (such as Visual Basic and Pascal) use the concept of global and module variables. These types of variables are very useful for passing complex parameters (like arrays or recordsets) to a procedure when its parameter list supports only basic data types. The same problem exists with stored procedures. You cannot pass a recordset through a parameter list to a stored procedure from the current batch or stored procedure, and neither recordsets nor local variables from the outer stored procedure (or batch) are visible to the inner stored procedure unless they are passed as a parameter to that procedure. Unfortunately, SQL Server does not support user-defined global variables. Modules, and therefore module variables, do not even exist in Transact-SQL. One way to pass a recordset is to create and fill a temporary table and then reference that temporary table from the inner stored procedure, which will be able to see and access its contents. The following example consists of two stored procedures. The
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SQL Server 2000 Stored Procedure & XML Programming
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first is business-oriented and collects a list of properties associated with an inventory asset. The list is implemented as a temporary table:
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Alter Procedure prGetInventoryProperties_TempTbl_Outer /* Return comma-delimited list of properties that are describing asset. i.e.: Property = Value unit;Property = Value unit;Property = Value unit; Property = Value unit; Property = Value unit; Property = Value unit; */ @intInventoryId int As set nocount on declare @chvProperties varchar(8000)
Create table #List(Id int identity(1,1), Item varchar(255)) -- identify Properties associated with asset insert into #List (Item) select Property + '=' + Value + ' ' + Coalesce(Unit, '') + '; ' from InventoryProperty inner join Property on InventoryProperty.PropertyId = Property.PropertyId where InventoryProperty.InventoryId = @intInventoryId -- call sp that converts records to a single varchar exec prConvertTempTbl @chvProperties OUTPUT -- display result select @chvProperties Properties drop table #List return 0 go
The second stored procedure, the nested stored procedure, is not business-oriented unlike the caller stored procedure, the nested stored procedure does not implement the business rule. It simply loops through the records in the temporary table (which was created in the calling stored procedure) and assembles them into a single varchar variable:
Alter Procedure prConvertTempTbl -- Convert information from Temporary table to a single varchar
9: Advanced Stored Procedure Programming
@chvResult varchar(8000) output As set nocount on declare @intCountItems int, @intCounter int, @chvItem varchar(255), @insLenItem smallint, @insLenResult smallint -- set loop select @intCountItems = Count(*), @intCounter = 1, @chvResult = '' from #List -- loop through list of items while @intCounter <= @intCountItems begin -- get one property select @chvItem = Item from #List where Id = @intCounter -- check will new string fit select @insLenItem = DATALENGTH(@chvItem), @insLenResult = DATALENGTH(@chvResult) if @insLenResult + @insLenItem > 8000 begin print 'List is too long (over 8000 characters)!' return 1 end -- assemble list set @chvResult = @chvResult + @chvItem -- let's go another round and get another item set @intCounter = @intCounter + 1 end return 0 go
You can execute this example from Query Analyzer, as shown in Figure 9-4.
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