how to generate barcode in c# Creating a CLR User-Defined Aggregate in Visual C#

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Creating a CLR User-Defined Aggregate
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The possibility of creating custom aggregation functions can be very useful when you want to create an aggregate that isn t included with SQL Server (such as a product aggregate) or to create an aggregate function that can handle a custom CLR UDT. When creating a CLR user-defined aggregate, you must create an entire CLR type (either class or struct) rather than just one or two methods as with the previous CLR objects. This is because the aggregate needs to be able to do a few things, including the following:
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initialize itself
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This is performed using the Init method of the aggregate CLR type.
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add another value to the calculation For each value that needs to be added to the calculation, the Accumulate method is called. combine itself with another instance of the same aggregate function
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performed by calling the Merge method.
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Return its result
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This is performed by calling the Terminate method.
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Before we explore more details of user-defined aggregates, take a few moments to read through the following example of CLR code, which defines a mathematical product aggregate. The result of this aggregate is all inputs multiplied together (such as 5 * 10 * 15 = 750). To add some extra functionality to this aggregate, we have included a second
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Lesson 2: Using SQLCLR and Filestream
parameter that tells the aggregate whether or not to include zeros in the calculation (because the inclusion of a zero would always result in an aggregate of zero). The possibility of having multiple parameters in user-defined aggregates was added in SQL Server 2008. There are quite a few observations to make about this code:
In this example, the SqlUserDefinedAggregate attribute tells SQL Server that we will manually manage serializing the aggregate (if necessary) by specifying the format to be user-defined (Format.UserDefined). The attribute also tells SQL Server that it should return NULL if no values are included in the aggregation (IsNullIfEmpty = True), that the aggregate cares about duplicates (IsInvariantToDuplicates = False), doesn t care about NULL values (IsInvariantToNulls = True), and doesn t care about the order of the input (IsInvariantToOrder = True). Finally, the attribute tells SQL Server that the maximum storage space used when serializing this aggregate is 19 bytes (16 bytes for the decimal value and 1 byte each for three Boolean values). The SqlFacet attribute is used a few times throughout the code to specify the precision and scale of the SqlDecimal type. The IBinarySerialize interface must be implemented because we used the user-defined format when defining the aggregate. You can also choose to use the native format; however, that does not work in this example because the decimal data type here is not supported by native serialization. The IBinarySerialize.Write method is called by SQL Server to serialize the instance during execution, if needed. The IBinarySerialize.Read method is called by SQL Server to deserialize the instance during execution, if needed.
'VB: Imports System Imports System.Data.SqlTypes Imports System.Runtime.InteropServices Imports Microsoft.SqlServer.Server
... <SqlUserDefinedAggregate(Format.UserDefined, IsNullIfEmpty:=True, _ IsInvariantToDuplicates:=False, IsInvariantToNulls:=True, _ IsInvariantToOrder:=True, MaxByteSize:=19)> _ Public Structure DecimalProductAggregate Implements IBinarySerialize
Private m_Value As Decimal ' 16 bytes storage. Private m_ValueIsNull As Boolean ' 1 byte storage. Private m_SkipZeros As Boolean ' 1 byte storage. Private m_SkipZerosIsNull As Boolean ' 1 byte storage.
Extending Microsoft SQL Server Functionality with XML, SQLCLR, and Filestream
Public Sub Init() Me.m_ValueIsNull = True Me.m_SkipZerosIsNull = True End Sub
Public Sub Accumulate(<SqlFacet(Precision:=38, Scale:=5)> ByVal value _ As SqlDecimal, ByVal skipZeros As SqlBoolean) If skipZeros.IsNull Then Throw New InvalidOperationException( _ "The @SkipZeros parameter cannot be null.") End If
If value.IsNull Then Return End If
' Init skip zeros flag if it hasn't' been set. If (Me.m_SkipZerosIsNull) Then Me.m_SkipZeros = skipZeros.Value Me.m_SkipZerosIsNull = False ElseIf Me.m_SkipZeros <> skipZeros.Value Then ' Don't allow the skip zeros setting to change during execution. Throw New InvalidOperationException( _ "The @SkipZeros parameter cannot be changed.") End If
' Skip zero values if the settings tells us to ' and the current value is zero. If Me.m_SkipZeros And value.Value = 0 Then Return End If
' If this is the first value, just set it. If Me.m_ValueIsNull Then Me.m_Value = value.Value Me.m_ValueIsNull = False Return End If
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