SQL Server 2000 Stored Procedure & XML Programming in .NET framework

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SQL Server 2000 Stored Procedure & XML Programming
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Using temporary tables to pass a recordset to a nested stored procedure
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You may question when this kind of solution is justified and whether these stored procedures are coupled. It is true that neither of these stored procedures can function without the other. If you have other stored procedures that also use prConvertTempTbl, I would consider this solution justified.
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Using a Cursor to Pass a Recordset to a Nested Stored Procedure
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Similar solutions can be implemented using cursors. Cursors are also visible to, and accessible from, nested stored procedures. The following example also consists of two stored procedures. The first is business-oriented and creates a cursor with properties associated with specified inventory:
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create Procedure prGetInventoryProperties_Cursor_Nested /* Return comma-delimited list of properties that are describing asset.
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9: Advanced Stored Procedure Programming
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i.e.: Property = Value unit;Property = Value unit;Property = Value unit; Property = Value unit; Property = Value unit; Property = Value unit; */ ( @intInventoryId int, @chvProperties varchar(8000) OUTPUT, @debug int = 0 ) As Select @chvProperties = '' Declare curItems Cursor For Select Property + '=' + [Value] + ' ' + Coalesce([Unit], '') + '; ' Item From InventoryProperty Inner Join Property On InventoryProperty.PropertyId = Property.PropertyId Where InventoryProperty.InventoryId = @intInventoryId Open curItems Exec prProcess_Cursor_Nested @chvProperties OUTPUT, @debug Close curItems Deallocate curItems Return 0 Go
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The second stored procedure is generic and converts information from a cursor into a single variable:
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Create Procedure prProcess_Cursor_Nested -- Process information from cursor initiated in calling sp. -- Convert records into a single varchar. ( @chvResult varchar(8000) OUTPUT, @debug int = 0 ) As Declare @intCountProperties int, @intCounter int,
SQL Server 2000 Stored Procedure & XML Programming
@chvItem varchar(255), @insLenItem smallint, @insLenResult smallint Fetch Next From curItems Into @chvItem While (@@FETCH_STATUS = 0) Begin If @debug <> 0 Select @chvItem Item -- check whether new string will fit Select @insLenItem = DATALENGTH(@chvItem), @insLenResult = DATALENGTH(@chvResult) If @insLenResult + @insLenItem > 8000 Begin Select 'List is too long (over 8000 characters)!' Return 1 End -- assemble list If @insLenItem > 0 Set @chvResult = @chvResult + @chvItem If @debug <> 0 Select @chvResult chvResult Fetch Next From curItems Into @chvItem End Return 0 Go
You can execute this code from Query Analyzer, as shown in Figure 9-5.
9: Advanced Stored Procedure Programming
Figure 9-5
Using a cursor to pass a recordset to a nested stored procedure
How to Process the Result Set of a Stored Procedure
From time to time, you will encounter stored procedures that return result sets that you need to process. This is not as simple as it sounds. One option is to receive the result set in a client application or middleware component and process it from there. Sometimes this option is not acceptable, for a variety of reasons. For example, the result set might be too big, in which case network traffic could be considerably increased. Since the result set needs to be transferred to the middleware server before it is processed, the performance of the system could be degraded. There might be security implications for example, you may determine that a user should have access only to a segment of a result set and not to the complete result set.
SQL Server 2000 Stored Procedure & XML Programming
An alternative option is to copy the source code of the stored procedure into your stored procedure. This could be illegal, depending on the source of the original stored procedure. It also reduces the maintainability of your code, since you have two copies to maintain; if the other stored procedure is a system stored procedure, Microsoft can change its internals with the release of each new version of SQL Server. Your stored procedure will then need to be changed. It is possible to collect the result set of a stored procedure in Transact-SQL code. You need to create a (temporary) table, the structure of which matches the structure of the result set exactly, and then redirect (insert) the result set into it. Then you can do whatever you want with it. The following stored procedure uses the sp_dboption system stored procedure to obtain a list of all database options and to obtain a list of database options that are set on the Asset database. Records that have a structure identical to that of the result set as returned by the stored procedure are collected in temporary tables. The Insert statement can then store the result set in the temporary table. The contents of the temporary tables are later compared and a list of database options not currently set is returned to the caller.
Create Procedure prNonSelectedDBOption -- return list of non-selected database options @chvDBName sysname As Set Nocount On Create Table #setable ( name nvarchar(35) ) Create Table #current ( name nvarchar(35) ) -- collect all options Insert Into #setable Exec sp_dboption -- collect current options Insert Into #current Exec sp_dboption @dbname = @chvDBName
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