Managed C++ User-defined Aggregate Function

Mar 16, 2007

Hi all,

I'm attempting to write an aggregate function in C++ to compare performance with the equivalent function in C#.

However, I'm having problems getting SQL Server to see the function in the assembly. It allows me to load the assembly into the database, but I can't see the type in it.

Here's my code:

// CPPTest.h

#pragma once

using namespace System;
using namespace Microsoft::SqlServer::Server;
using namespace System::Data::SqlTypes;
using namespace System::Data::SqlClient;

namespace CPPTest {

[Serializable]
[Microsoft::SqlServer::Server::SqlUserDefinedAggregate(
Format::Native,
Name="AGG_CPP_OR")]
public ref struct AGG_CPP_OR
{
public:
void Init();
void Accumulate(SqlInt32 Value);
void Merge(AGG_CPP_OR^ Group);
SqlInt32 Terminate();

private:
SqlInt32 m_accum;
};

}


// CPPTest.cpp

#include "stdafx.h"

#include "CPPTest.h"

void CPPTest::AGG_CPP_OR::Init()
{
m_accum = 0;
}

void CPPTest::AGG_CPP_OR::Accumulate(SqlInt32 Value)
{
m_accum = m_accum | Value;
}

void CPPTest::AGG_CPP_OR::Merge(CPPTest::AGG_CPP_OR^ Group)
{
m_accum = m_accum | Group->m_accum;
}

SqlInt32 CPPTest::AGG_CPP_OR::Terminate()
{
return m_accum;
}

Compile it with /clr:safe option and it can be loaded as an assembly into SQL Server 2005 (9.0.1399), but the AGG_CPP_OR type is not seen as an aggregate function. I've also tried implementing IBinarySerialize and setting Format to Format::UserDefined (and putting in MaxByteSize) but it makes no difference.

Does anyone know what I'm missing here?

Many thanks,

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I am trying to modify the C# example given in the "Invoking CLR User-Defined Aggregate Functions" in SQL Server 2005 Books Online. I want to add a parameter that is used as the list delimeter, instead of the hard coded comma that is used. I am not a C# programmer and don't know where to begin. Please help!

using System;
using System.Data;
using Microsoft.SqlServer.Server;
using System.Data.SqlTypes;
using System.IO;
using System.Text;

[Serializable]
[SqlUserDefinedAggregate(
Format.UserDefined, //use clr serialization to serialize the intermediate result
IsInvariantToNulls = true, //optimizer property
IsInvariantToDuplicates = false, //optimizer property
IsInvariantToOrder = false, //optimizer property
MaxByteSize = 8000) //maximum size in bytes of persisted value
]
public class Concatenate : IBinarySerialize
{
/// <summary>
/// The variable that holds the intermediate result of the concatenation
/// </summary>
private StringBuilder intermediateResult;

/// <summary>
/// Initialize the internal data structures
/// </summary>
public void Init()
{
this.intermediateResult = new StringBuilder();
}

/// <summary>
/// Accumulate the next value, not if the value is null
/// </summary>
/// <param name="value"></param>
public void Accumulate(SqlString value)
{
if (value.IsNull)
{
return;
}

this.intermediateResult.Append(value.Value).Append(','); /// I want to change to comma to a variable
}

/// <summary>
/// Merge the partially computed aggregate with this aggregate.
/// </summary>
/// <param name="other"></param>
public void Merge(Concatenate other)
{
this.intermediateResult.Append(other.intermediateResult);
}

/// <summary>
/// Called at the end of aggregation, to return the results of the aggregation.
/// </summary>
/// <returns></returns>
public SqlString Terminate()
{
string output = string.Empty;
//delete the trailing comma, if any
if (this.intermediateResult != null
&& this.intermediateResult.Length > 0)
{
output = this.intermediateResult.ToString(0, this.intermediateResult.Length - 1);
}

return new SqlString(output);
}

public void Read(BinaryReader r)
{
intermediateResult = new StringBuilder(r.ReadString());
}

public void Write(BinaryWriter w)
{
w.Write(this.intermediateResult.ToString());
}
}

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Hi,

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Hello i have this query and I havent been able to solve it

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I have tried with dbo and withou dbo, specifyng columns inside it,



Thanks

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g.DSOPCIONESCALA, g.PESO

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Code Snippet

Imports System

Imports System.Data

Imports System.Data.SqlClient

Imports System.Data.SqlTypes

Imports Microsoft.SqlServer.Server



<Serializable()> _

<Microsoft.SqlServer.Server.SqlUserDefinedAggregate(Format.Native)> _

Public Structure GetRandom

Public s As SqlString

Public x As Integer

Public Sub Init()

x = 0

Randomize()

End Sub

Public Sub Accumulate(ByVal value As SqlString)

s = New SqlString(s.ToString & "|" & value.ToString)

x = x + 1

End Sub

Public Sub Merge(ByVal value As GetRandom)

End Sub

Public Function Terminate() As SqlString

Dim d() As String = {"|"}

Return New SqlString(s.ToString.Split(d, StringSplitOptions.RemoveEmptyEntries)(Rnd() * x))

End Function

End Structure



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Msg 6597, Level 16, State 2, Line 1

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Msg 6265, Level 16, State 1, Line 1

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-------------------------

Here is my code:

ALTER DATABASE MEDIO set TRUSTWORTHY ON

CREATE ASSEMBLY MyAgg FROM 'C:codeconsolePriceUDAobjDebugPriceUDA.dll' WITH PERMISSION_SET = unsafe

CREATE AGGREGATE MyAgg (@input nvarchar(200)) RETURNS nvarchar(max) EXTERNAL NAME MyAgg.Concatenate

GO

---------------------------------------

import System.*;

import System.Data.*;

import Microsoft.SqlServer.Server.*;

import System.Data.SqlTypes.*;

import System.IO.*;

import System.Text.*;

/** @attribute Serializable() */

/** @attribute SqlUserDefinedAggregate(

Format.UserDefined, //use clr serialization to serialize the intermediate result

IsInvariantToNulls = true, //optimizer property

IsInvariantToDuplicates = false, //optimizer property

IsInvariantToOrder = false, //optimizer property

MaxByteSize = 8000) //maximum size in bytes of persisted value

*/

public class Concatenate implements IBinarySerialize

{

/// <summary>

/// The variable that holds the intermediate result of the concatenation

/// </summary>

private StringBuilder intermediateResult;

/// <summary>

/// Initialize the internal data structures

/// </summary>

public void Init()

{

this.intermediateResult = new StringBuilder();

}

/// <summary>

/// Accumulate the next value, not if the value is null

/// </summary>

/// <param name="value"></param>

public void Accumulate(SqlString value)

{

if (value.get_IsNull())

{

return;

}

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}

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/// Merge the partially computed aggregate with this aggregate.

/// </summary>

/// <param name="other"></param>

public void Merge(Concatenate other)

{

this.intermediateResult.Append(other.intermediateResult);

}

/// <summary>

/// Called at the end of aggregation, to return the results of the aggregation.

/// </summary>

/// <returns></returns>

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{

String output = String.Empty;

//delete the trailing comma, if any

if (this.intermediateResult != null

&& this.intermediateResult.get_Length() > 0)

{

output = this.intermediateResult.ToString(0, this.intermediateResult.get_Length() - 1);

}

return new SqlString(output);

}

public void Read(BinaryReader r)

{

intermediateResult = new StringBuilder(r.ReadString());

}

public void Write(BinaryWriter w)

{

w.Write(this.intermediateResult.ToString());

}

}

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FROM sales s, titles t

)
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select title from SalesByStore(getdate())

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Need Help Optizing A User Defined Function

Mar 3, 2004

Hi,
I posted a question sometime back about any one has written a function which converts a given date to a a new timezone.

As it turns out I have actually written the function and it is functionally sound.

the issue I am not facing is the performace.

The Algorithm is pretty simple.
step 1
I have create a table called TZ1 which has the TImezoneCODE (PST,EST..), daylightsavingsstart (DATETIME on which the daylight savings start), daylightsavingsend ( end of DLS) and offset (EG -8 for PST, -5 for EST etc)

step 2
I check the timezone and pick out corresponding start and enddate for daylight savings.

Step 3
Depending on where the date lies I create a new date by adding offset to the original datetime (+1) for the new date and then return this new datetime.

As simple as this looks the response time is 16 times than that of a select statement without the function.

Do you see something that I can tune to get a better response time.

Heres my code


================================================== ================================================== ================================================== ================================================== ==================================

CREATE FUNCTION TC3
-- drop function tc3
(@dt datetime, @Src varchar(10), @Dest varchar(10))
Returns datetime
begin
declare @v_src varchar(10)
Declare @v_dest varchar(10)
declare @V_dt datetime
declare @v_newdt datetime
declare @v_year int
declare @v_offset float
declare @v_sd datetime
declare @v_ed datetime

-- select * into TZ1 from TZ1
-- create table #tz1 (fn int)

select @v_year = datepart (year, @dt)

if (@v_year between 2000 and 2004)
begin
-- -------------------
-- PST BEgin
-- -------------------
if (@dest = 'PST')
begin
-- select * from TZ1
select @V_year = datepart (year, @dt)

select @v_offset = offset,
@v_sd = daylightsavingsstart,
@v_ed = daylightsavingsend
from TZ1
where
@V_YEAR = YEAR
and timezonecode = @dest
-- AND @DT between daylightsavingsstart and daylightsavingsend

if (@dt between @v_sd and @v_ed )
begin
-- ( select @v_newdt = dateadd (hh, -9, @dt) )
select @v_newdt = dateadd (hh, CAST( @v_offset as int)-1 , @dt)
end
else
begin
-- ( select @v_newdt = dateadd (hh, -8, @dt) )
select @v_newdt = dateadd (hh, @v_offset, @dt)
end -- if dt between daylight savings

return @v_newdt
end -- @dest=pst end
-- -------------------
-- PST END
-- -------------------
-- -------------------
-- EST BEGIN
-- -------------------

ELSE

if (@dest = 'EST')
begin

select @V_year = datepart (year, @dt)

select @v_offset = offset,
@v_sd = daylightsavingsstart,
@v_ed = daylightsavingsend
from TZ1
where
@V_YEAR = YEAR
and timezonecode = @dest

if (@dt between @v_sd and @v_ed )
begin
-- ( select @v_newdt = dateadd (hh, -9, @dt) )
select @v_newdt = dateadd (hh, CAST( @v_offset as int)-1 , @dt)
end
else
begin
-- ( select @v_newdt = dateadd (hh, -8, @dt) )
select @v_newdt = dateadd (hh, @v_offset, @dt)
end -- if dt between daylight savings


return @v_newdt

end -- @dest=Est end

-- -------------------
-- EST END
-- -------------------

-- -------------------
-- HST BEgin
-- select * from timezones
-- -------------------
else
if (@dest = 'HST')
begin

select @V_year = datepart (year, @dt)

select @v_offset = offset,
@v_sd = daylightsavingsstart,
@v_ed = daylightsavingsend
from TZ1
where
@V_YEAR = YEAR
and timezonecode = @dest

if (@dt between @v_sd and @v_ed )
begin
-- ( select @v_newdt = dateadd (hh, -9, @dt) )
select @v_newdt = dateadd (hh, CAST( @v_offset as int) , @dt)
end
else
begin
-- ( select @v_newdt = dateadd (hh, -8, @dt) )
select @v_newdt = dateadd (hh, @v_offset, @dt)
end -- if dt between daylight savings


return @v_newdt

end -- @dest=Ast end

-- -------------------
-- HST END
-- -------------------

-- -------------------
-- MST BEgin
-- select * from timezones
-- -------------------
else
if (@dest = 'MST')
begin

select @V_year = datepart (year, @dt)

select @v_offset = offset,
@v_sd = daylightsavingsstart,
@v_ed = daylightsavingsend
from TZ1
where
@V_YEAR = YEAR
and timezonecode = @dest

if (@dt between @v_sd and @v_ed )
begin
-- ( select @v_newdt = dateadd (hh, -9, @dt) )
select @v_newdt = dateadd (hh, CAST( @v_offset as int)-1 , @dt)
end
else
begin
-- ( select @v_newdt = dateadd (hh, -8, @dt) )
select @v_newdt = dateadd (hh, @v_offset, @dt)
end -- if dt between daylight savings

return @v_newdt

end -- @dest=Mst end

-- -------------------
-- MST END
-- -------------------

else
return '19990909'
end -- year end

return @v_newdt


end





================================================== ================================================== ================================================== =============================================

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