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Me.m_Value *= value.Value End Sub
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Public Sub Merge(ByVal other As DecimalProductAggregate) Dim skipZeros As SqlBoolean If other.m_SkipZerosIsNull Then skipZeros = SqlBoolean.Null
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Lesson 2: Using SQLCLR and Filestream
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Else skipZeros = other.m_SkipZeros End If Dim otherValue As SqlDecimal = other.Terminate()
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Me.Accumulate(otherValue, skipZeros) End Sub
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Public Function Terminate() As <SqlFacet(Precision:=38, Scale:=5)> SqlDecimal If Me.m_ValueIsNull Then Return SqlDecimal.Null End If Return Me.m_Value End Function
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' Read the aggregate from SQL Server. Sub Read(ByVal r As System.IO.BinaryReader) Implements IBinarySerialize.Read Me.m_ValueIsNull = r.ReadBoolean() Me.m_Value = r.ReadDecimal() Me.m_SkipZerosIsNull = r.ReadBoolean() Me.m_SkipZeros = r.ReadBoolean() End Sub
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' Write the aggregate to SQL Server. Sub Write(ByVal w As System.IO.BinaryWriter) Implements IBinarySerialize.Write w.Write(Me.m_ValueIsNull) w.Write(Me.m_Value) w.Write(Me.m_SkipZerosIsNull) w.Write(Me.m_SkipZeros) End Sub End Structure ...
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//C#: using System; using System.Data.SqlTypes; using System.Runtime.InteropServices; using Microsoft.SqlServer.Server;
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... [SqlUserDefinedAggregate(Format.UserDefined, IsNullIfEmpty=true, IsInvariantToDuplicates=false, IsInvariantToNulls=true, IsInvariantToOrder=true, MaxByteSize=19)] public struct DecimalProductAggregate : IBinarySerialize
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Extending Microsoft SQL Server Functionality with XML, SQLCLR, and Filestream
private decimal m_Value; // 16 bytes storage. private bool m_ValueIsNull; // 1 byte storage. private bool m_SkipZeros; // 1 byte storage. private bool m_SkipZerosIsNull; // 1 byte storage.
public void Init() { this.m_ValueIsNull = true; this.m_SkipZerosIsNull = true; }
public void Accumulate([SqlFacet(Precision = 38, Scale = 5)]SqlDecimal value, SqlBoolean skipZeros) { if (skipZeros.IsNull) { throw new InvalidOperationException( "The @SkipZeros parameter cannot be null."); } if (value.IsNull) return;
// Init skip zeros flag if it hasn't been set. if (this.m_SkipZerosIsNull) { this.m_SkipZeros = skipZeros.Value; this.m_SkipZerosIsNull = false; } // Don't allow the skip zeros setting to change during execution. else if (this.m_SkipZeros != skipZeros.Value) { throw new InvalidOperationException( "The @SkipZeros parameter cannot be changed."); }
// Skip zero values if the settings tells us to // and the current value is zero. if (this.m_SkipZeros && value.Value == 0M) { return; }
// If this is the first value, just set it. if (this.m_ValueIsNull)
Lesson 2: Using SQLCLR and Filestream
{ this.m_Value = value.Value; this.m_ValueIsNull = false; return; }
this.m_Value *= value.Value; }
public void Merge(DecimalProductAggregate other) { SqlBoolean skipZeros = other.m_SkipZerosIsNull SqlBoolean.Null : other.m_SkipZeros; SqlDecimal otherValue = other.Terminate();
this.Accumulate(otherValue, skipZeros); }
[return: SqlFacet(Precision = 38, Scale = 5)] public SqlDecimal Terminate() { if (this.m_ValueIsNull) { return SqlDecimal.Null; } return this.m_Value; }
// Read the aggregate from SQL Server. void IBinarySerialize.Read(System.IO.BinaryReader r) { this.m_ValueIsNull = r.ReadBoolean(); this.m_Value = r.ReadDecimal(); this.m_SkipZerosIsNull = r.ReadBoolean(); this.m_SkipZeros = r.ReadBoolean(); }
// Write the aggregate to SQL Server. void IBinarySerialize.Write(System.IO.BinaryWriter w) { w.Write(this.m_ValueIsNull); w.Write(this.m_Value); w.Write(this.m_SkipZerosIsNull); w.Write(this.m_SkipZeros); } } ...
Extending Microsoft SQL Server Functionality with XML, SQLCLR, and Filestream
After loading the assembly into SQL Server, you can execute the following T-SQL code to create the user-defined aggregate:
CREATE AGGREGATE dbo.PRODUCT_DECIMAL_38_5 ( @Input DECIMAL(38,5) ,@SkipZeros BIT ) RETURNS DECIMAL(38,5) EXTERNAL NAME TK433ClrDemo."TK433.Clr.DecimalProductAggregate";
In this case, we named the aggregate PRODUCT_DECMIAL_38_5 so that it reflects the actual type for which it can calculate the product. You can see how we can use the user-defined aggregate in an SQL query in the following T-SQL code:
WITH Numbers AS ( SELECT * FROM (VALUES (0) ,(5.5) ,(10.5) ,(15.5) ) AS a(Number) ) SELECT dbo.PRODUCT_DECIMAL_38_5(Number, 1) AS ProductExcludingZeros ,dbo.PRODUCT_DECIMAL_38_5(Number, 0) AS ProductIncludingZeros FROM Numbers;
Here is the result:
ProductExcludingZeros --------------------895.12500 ProductIncludingZeros --------------------0.00000
In this example, the query is executed against a CTE, but the user-defined aggregate can be used against tables as well.
Creating a CLR UDT
The final CLR object that is supported by SQL Server is a UDT. Creating custom UDTs is similar to creating user-defined aggregates. The type consists of a CLR type (class or struct) that uses the SqlUserDefinedType attribute to inform SQL Server of its various behaviors. In the following example, you can see the CLR code that is used to define a CLR UDT. This type, called CURRENCY_VALUE, can be used to store a monetary value (a decimal) and its currency code (a string). (Note that this example has not been rigorously tested and should not be used in production code.)
Lesson 2: Using SQLCLR and Filestream
As with user-defined aggregates, there are a few observations to make about this code:
In this example, the SqlUserDefinedType attribute tells SQL Server that we will manually manage serializing the type by specifying the format to be user-defined (Format .UserDefined). The attribute also tells SQL Server that a method named Validate should be run to verify the integrity of the type whenever a binary value is cast to this type (ValidationMethodName) and that the type is not byte-ordered (IsByteOrdered = False). Because the only sorting of UDTs supported by SQL Server is byte sorting, you should be very careful how you implement it. Remember that an integer value of 1 is larger than 1 when comparing the byte structures because the most significant bit in the integer is set to 1 if it is negative and to zero if it is positive. The other two options that are set are IsFixedLength, which tells SQL Server whether this type always uses the same number of bytes for storage, and MaxByteSize, which, as for a user-defined aggregate, tells SQL Server the maximum number of bytes needed to store a serialized instance of this type. The SqlFacet attribute is used a few times throughout the code to specify the precision and scale of the SqlDecimal type, as well as the maximum length of the SqlString type. The SqlMethod attribute is used in two places to specify that both the CurrencyCode and the Value properties are deterministic and precise; therefore, it can be indexed and persisted. The Parse method is used to convert from a string to the UDT. It is automatically called by SQL Server both when implicitly and explicitly converting a string to this type. The ToString method is used by SQL Server when converting from the UDT to a string. Note that it is typically a very good idea for the Parse and ToString methods to use the same string representation of the type. The IBinarySerialize interface must be implemented because we used the user-defined format when defining the type. You can also choose to use the native format; however, it will not work in this example because neither the decimal nor the string data types that are used in this example are supported for native serialization. The IBinarySerialize.Write method is called by SQL Server to serialize the type. The IBinarySerialize.Read method is called by SQL Server to deserialize the type.
'VB: Imports System Imports System.Data.SqlTypes Imports System.Runtime.InteropServices Imports Microsoft.SqlServer.Server
... <SqlUserDefinedType(Format.UserDefined, ValidationMethodName:="Validate", _ IsByteOrdered:=False, IsFixedLength:=True, MaxByteSize:=20)> _ Public Structure CurrencyValueType Implements IBinarySerialize, INullable
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