barcode generator vb.net free ADVANCED STORED PROCEDURE PROGRAMMING in Software

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CHAPTER 10. ADVANCED STORED PROCEDURE PROGRAMMING
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Exercise 10.1
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Create a pair of stored procedures that use optimistic locking to obtain and update a record in the Inventory table. Assume that the client application cannot handle the timestamp datatype and that you have to use the money datatype instead.
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SQL Server 2000 Stored Procedure Programming
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Exercise 10.1 Solution
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The record can be obtained using a stored procedure such as the following:
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Create Procedure prGetInventory -- get record with timestamp converted to money datatype ( @intInventoryId int ) As set nocount on SELECT Inventoryid, EquipmentId, LocationId, StatusId, LeaseId, LeaseScheduleId, OwnerId, Rent, Lease, Cost, AcquisitionTypeID, AcquisitionDate, Convert(money, ts) mnyTimestamp FROM Inventory where InventoryId = @intInventoryId return @@Error
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The following stored procedure updates the record if it has not been changed since being read by the client application:
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Create Procedure prUpdateInventory -- update record from Inventory table -- prevent user from overwriting changed record ( @intInventoryid int, @intEquipmentId int, @intLocationId int, @intStatusId int, @intLeaseId int, @intLeaseScheduleId int, @intOwnerId int, @mnsRent smallmoney, @mnsLease smallmoney, @mnsCost smallmoney, @intAcquisitionTypeID int, @dtsAcquisitionDate smalldatetime, @mnyOriginalTS money
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Appendix B:
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Solutions to the Exercises
) As set nocount on declare @tsOriginalTS timestamp, @intErrorCode int set @intErrorCode = @@Error if @intErrorCode = 0 begin Set @tsOriginalTS = Convert(timestamp, @mnyOriginalTS) set @intErrorCode = @@Error end if @intErrorCode = 0 begin Update inventory Set EquipmentId = @intEquipmentId, LocationId = @intLocationId, StatusId = @intStatusId, LeaseId = @intLeaseId, LeaseScheduleId = @intLeaseScheduleId, OwnerId = @intOwnerId, Rent = @mnsRent, Lease = @mnsLease, Cost = @mnsCost, AcquisitionTypeID = @intAcquisitionTypeID, AcquisitionDate = @dtsAcquisitionDate where Inventoryid = @intInventoryid and TSEqual(ts, @tsOriginalTS) set @intErrorCode = @@Error end return @intErrorCode
Exercise 10.2
Take a stored procedure from Exercise 4.7, 4.12, or 7.6 and return the results in a single resultset.
SQL Server 2000 Stored Procedure Programming
Exercise 10.2 Solution
I have taken prSpaceUsedByTables_1 from Exercise 4.7 Solution and changed it into the following procedure:
Alter Procedure prSpaceUsedByTables_3 -- loop through table names in current database -- display info about amount of space used by each table As Set nocount on declare @MaxCounter int, @Counter int, @TableName sysname Create Table #SpaceInfo(name nvarchar(20), rows char(11), reserved varchar(18), data varchar(18), index_size varchar(18), unused varchar(18)) Create table #Tables ( Id int identity(1,1), TableName sysname) -- collect table names insert into #Tables(TableName) select name from sysobjects where xtype = 'U' -- prepare loop Select @MaxCounter = Max(Id), @Counter = 1 from #Tables
while @Counter <= @MaxCounter
Appendix B:
Solutions to the Exercises
begin -- get table name select @TableName = TableName from #Tables where Id = @Counter -- display space used insert into #SpaceInfo(name, rows, reserved, data, index_size, unused) exec sp_spaceused @TableName
set @Counter = @Counter + 1 end select * from #SpaceInfo drop table #Tables drop table #SpaceInfo
The results from the sp_spaceused stored procedure are inserted into a temporary table.
insert into #SpaceInfo(name, rows, reserved, data, index_size, unused) exec sp_spaceused @TableName
#SpaceInfo has to have the same structure as the resultset from sp_spaceused. This requirement usually constitutes the biggest challenge in this kind of solution. It is easy if you can access the source code of the stored procedure or the structure of the resultset is published in the documentation, but such is not always the case.
Create Table #SpaceInfo(name nvarchar(20), rows char(11), reserved varchar(18) , data varchar(18) , index_size varchar(18) , unused varchar(18) )
SQL Server 2000 Stored Procedure Programming
At the end of the stored procedure, results are sent to the caller:
select * from #SpaceInfo
Exercise 10.3
Create a new version of the prGetInventoryProperties stored procedure that uses a While statement with a Min() function.
NOTE: Do not feel frustrated if you have trouble implementing the While loop in this case. This solution is complicated because three columns are read in each loop. The aggregate function Min() cannot be applied in a select list to one column without being applied to the others.
Exercise 10.3 Solution
There are different solutions to this problem. One would be to use a subquery to extract the appropriate identifier field and then use that field to obtain the rest of the fields. The original solution (prGetInventoryProperties) used an aggregate function in the select list. Since we removed the aggregate function from the select list, if no records qualify in the Select statement, the program does not set the values of variables to NULL. They simply retain their old values. The criteria in the While statement can never be satisfied, and the result is an endless loop. To prevent this, we set the values of the variables to NULL before each selection.
Alter Procedure prGetInventoryProperties_WhileLoop -- Return comma-delimited list of properties -- that are describing asset. -- It uses While loop without temporary table -- i.e.: Property = Value unit;Property = Value unit;Property = ... ( @intInventoryId int, @chvProperties varchar(8000) OUTPUT, @debug int = 0 )
Appendix B:
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