barcode generator vb.net download 5: Functions in Visual Studio .NET

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5: Functions
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( @intInventoryId int, @chvProperties varchar(8000) OUTPUT ) As declare @intCountProperties int, @intCounter int, @chvProperty varchar(50), @chvValue varchar(50), @chvUnit varchar(50), @insLenProperty smallint, @insLenValue smallint, @insLenUnit smallint, @insLenProperties smallint Create table #Properties( Id int identity(1,1), Property varchar(50), Value varchar(50), Unit varchar(50)) -- identify Properties associated with asset insert into #Properties (Property, Value, Unit) select Property, Value, Unit from InventoryProperty inner join Property on InventoryProperty.PropertyId = Property.PropertyId where InventoryProperty.InventoryId = @intInventoryId -- set loop select @intCountProperties = Count(*), @intCounter = 1, @chvProperties = '' from #Properties -- loop through list of properties while @intCounter <= @intCountProperties begin -- get one property select @chvProperty = Property, @chvValue = Value, @chvUnit = Unit from #Properties where Id = @intCounter
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-- check will new string 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 characters)!' return 1 end -- assemble list set @chvProperties = + + +
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@chvProperties + '; ' @chvProperty + '=' @chvValue + ' ' @chvUnit
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-- let's go another round and get another property set @intCounter = @intCounter + 1 end drop table #Properties return 0
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SQL Server 2000 introduces the Binary_CheckSum() function, which calculates the binary checksum of a specified expression or set of table columns. It is designed to detect changes in a record. This function uses the following syntax:
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Binary_CheckSum(*|expression[,...n])
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Binary_CheckSum() is a much-needed tool for data warehousing projects. It allows DBAs to detect and handle the problem of slowly changing dimensions type 2 and 3.
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The following stored procedure compares the binary checksum of columns containing new information with the checksum of columns already stored in the table; if the values do not match, the new data will be inserted into the table:
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CREATE Procedure prUpdateEquipment -- Check if values were changed in the meanwhile -- Update values in equipment table.
5: Functions
@intEquipmentId int, @chvMake varchar(50), @chvModel varchar(50), @intEqTypeId int, @debug int = 0 As declare @intNewEquipmentBC int set @intNewEquipmentBC = Binary_CheckSum(@chvMake, @chvModel, @intEqTypeId) if @debug <> 0 Select @intNewEquipmentBC NewBC if @debug <> 0 select EquipmentBC OldBC from EquipmentBC where EquipmentId = @intEquipmentId if not exists (Select EquipmentBC from EquipmentBC where EquipmentId = @intEquipmentId) insert EquipmentBC (EquipmentId, EquipmentBC) select @intEquipmentId, Binary_CheckSum(Make, Model, EqTypeId) from Equipment where EquipmentId = @intEquipmentId -- Check if values were changed in the meanwhile if @intNewEquipmentBC <> (Select EquipmentBC from EquipmentBC where EquipmentId = @intEquipmentId) begin if @debug <> 0 select 'Information will be updated.' -- update information update Equipment Set Make = @chvMake, Model = @chvModel, EqTypeId = @intEqTypeId where EquipmentId = @intEquipmentId if exists(select EquipmentId from EquipmentBC where EquipmentId = @intEquipmentId)
SQL Server 2000 Stored Procedure & XML Programming
update EquipmentBC Set EquipmentBC = @intNewEquipmentBC where EquipmentId = @intEquipmentId else insert EquipmentBC (EquipmentId, EquipmentBC) values (@intEquipmentId, @intNewEquipmentBC) end return
NOTE
Binary_CheckSum() is case-sensitive. It evaluates columns/expressions differently depending on the case (uppercase/lowercase) used in the column or expression. This might seem unusual since most SQL Server behavior depends on the code page that you select during installation. If the default is selected, SQL Server ignores the case of characters when matching them. The nature of the algorithm used to implement the Binary_CheckSum() function is such that it cannot work that way.
Functions for Handling null Values SQL Server is equipped with a set of three functions to help ease the pain of using null in your database system:
NullIf(expression, expression) IsNull(check_expression, replacement_value) Coalesce(expression [,...n])
NullIf() returns null if two expressions in the function are the same value. If the expressions are not equivalent, the function returns the value of the first expression. This function can be useful when calculating the average of columns that accept null values. For example, let s assume that the author of the Asset database has created constraints or stored procedures such that a user can leave the value of the Inventory.Rent column as either null or zero when equipment is not leased. In this case, the Avg() function for calculating the average of the column will eliminate records containing null from the average but keep records with zero. It is not that the Avg() function is implemented improperly, but rather that our design can be improved. It is possible to implement a workaround using the NullIf() function:
select AVG(Rent) [average without nulls], AVG(NullIf(Rent, 0)) [average without nulls and zeros] from Inventory
An average calculated in this way will be different from an average calculated in the standard way:
average without nulls average without nulls and zeros --------------------- -------------------------------
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