User Defined Aggregate Problem

Feb 22, 2008

I am trying to get a random value from a select statement. The only way I thought to do this would be to make a User Defined Aggregate Function at returns one of the rows at random. For example MIN(column) return the minimum value of that column, MAX(column) returns the maximum. I would like something like RANDOM(column) to return one of the values at random.

For example: select RANDOM(Name) from Names

So I went and created a user defined aggregate function:




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



The problem is that it wont deploy to the SQL Server because the varible "s" is not serilizable. Here is the error message:

Type "GetRandomFunction.GetRandom.GetRandom" is marked for native serialization, but field "s" of type "GetRandomFunction.GetRandom.GetRandom" is not valid for native serialization.

Can any help me with this? Is there any other way of storing the strings that will work?

Thanks,
Stuart Fox

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CLR User Defined Aggregate Function

Oct 4, 2006

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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Like A User Defined Aggregate Function For Concate

May 8, 2008

Hi,

I have a table T1 with two fields. Field1 has repeated values and Field2 has unique values for any given Field1 value. F1 can have maybe 1000 different values while F2 maybe 20.

I would like to create a T2 table where Field1 has unique values and Field2 contains the concatenation of T1.Field1 values for each Field1 value.

T1
F1F2
1a
1b
2a
2c
2d

T2
F1F2
1ab
2acd

It is like a user defined aggregate function for concatenation. Any idea?

Cornelius

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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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May 18, 2006

I want to write a Java User-defined aggregate (UDA). Shall I use J#?

I converted the C# example given in books online to J#. I am getting this error (as well as whole bunch of warning when I create the assembly.)

Msg 6558, Level 16, State 1, Line 1

CREATE AGGREGATE failed because type 'Concatenate' does not conform to UDAGG specification due to method 'Init'.

Msg 6597, Level 16, State 2, Line 1

CREATE AGGREGATE failed.

btw, I have the use unsafe assembly options when creating the assembly otherwise I get this error:

Msg 6265, Level 16, State 1, Line 1

CREATE ASSEMBLY failed because type "com.ms.vjsharp.cor.COMUtils" in safe assembly "vjscor" has a pinvokeimpl method. P/Invoke is not allowed in safe assemblies.

Warning: The Microsoft .Net frameworks assembly 'vjscor, version=2.0.0.0, culture=neutral, publickeytoken=b03f5f7f11d50a3a, processorarchitecture=x86.' you are registering is not fully tested in SQL Server hosted environment.

From the warning, I can tell the J# UDA is not tested.

Can someone confirm whether J# UDA is supported or not?

Thanks!

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

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;

}

this.intermediateResult.Append(value.get_Value()).Append(',');

}

/// <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.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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Cheers,
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Hello i have this query and I havent been able to solve it

Cannot find either column "dbo" or the user-defined function or aggregate "dbo.FN_NIVELCOMPETENCIACARGO", or the name is ambiguous.

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



Thanks

select a.nmempresa,a.nmtipocompetencia, d.dsnombreciclo, c.dsnombrecargo,a.dstipocompetencia, a.dscatalogo,

b.popeso as PesoTipoCompetencia, f.dsnombrecompetencia as Competencia, e.pocompetencia as PesoCompetencia,

g.DSOPCIONESCALA, g.PESO

from

tgsc_tiposcompetencias a, TGSC_TIPOSCOMPETENCIASxcargo b, tgsc_cargos c, tgsc_ciclos d,

tgsc_competenciasxcargo e, tgsc_competencias f,

(select

dbo.FN_NIVELCOMPETENCIACARGO(a.nmempresa,a.nmciclo, a.nmtipocompetencia,c.nmcargo,f.nmcompetencia)) as g

where a.nmempresa=72 and a.nmciclo=9

and b.nmtipocompetencia=a.nmtipocompetencia

and b.nmcargo=10 and b.nmempresa=72 and b.nmciclo=9

and c.nmcargo=10 and c.nmempresa=72 and c.nmciclo=9 and d.nmciclo=9

and e.nmcargo=10 and e.nmciclo=9 and e.nmempresa=72

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"deploy_project_internal":

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System.ComponentModel.Win32Excepbon:

at Microsoft. SqlServer. IntegrationServices.Server.ISServerProcess.StartProcess(Soolean

bSuspendThread)

at Microsoft.SqlServer.IntegrationServices.Server.ServerApi.DeployProjectlnternal(SqlInt64 deployld,

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Hi,

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ie:

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Code:

DECLARE @SortPlanBinZipCodeRanges TABLE
(
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SortPlanBinID INT NULL,
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BinTypeID TINYINT NULL,
BinFlagTypeID TINYINT NULL,
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ZipCodeRanges ZipCodes8000 NULL
)


error:
Msg 2715, Level 16, State 7, Line 1
Column or parameter #7: Cannot find data type ZipCodes8000.

Thank you in advance.

Todd

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Jan 16, 2008

I've been doing some reading on UDT's and have a question...

It was suggested in one of the pieces I read that you could create a UDT for, in their example, cities. And every table that had a reference to city could share this datatype. Now, my initial thought was "wow, what a great idea! I wouldn't have to remember the exact datatype for my primary keys (was it a char(5) or char(6)?) and have a "central depository" for my key datatypes.

So the first question is; what are the disadvantages of such a design?

And the second is; How do you update a UDT? If business requirements change and udt_city needs to be changed from varchar(30) to varchar(60), for example, what would be the way of echoing the change thoughout your database?

My gut reaction for the answers are
1) performance will decrease as effectively the dbms has to "parse" every insert/update to a UDT field in a different method.

2) create a new udt and alter any tables referencing the old one before dropping it.

What do we think?

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Mar 18, 2008

Hello

Is there a way that I can create a user defined variable in my database? I have a fairly large chunk of xml that I would like to store in the database that can be updated by clients ( in rare cases ). I could use other mechinisms to allow access to it, but all other application related information is stored nicely in this one place, I hate to vary for this single piece.

Thank you for your time and thoughts.
Patrick

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Jan 27, 2004

hi all,

I made myself a user defined function, it works great, but is there a way to make it available to all databases?

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alex

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Feb 19, 2004

When I define a UDF in SQL 2000 I can't execute it without qualifiction. Here's the code:
CREATE FUNCTION GetLastShipDate(@DO_No CHAR(10))
RETURNS CHAR(10)
-- DROP FUNCTION GetLastShipDate
BEGIN
DECLARE @v_last_ship_date CHAR(10)

SELECT @v_last_ship_date = COALESCE(CONVERT(CHAR(10), MAX(Asn.Asn_Ship_DateTime), 110), '')
FROM Asn,Asn_Do
WHERE Asn_Do.Asn_Number=Asn.Asn_Number
AND Asn_Do.DO_Number = @DO_No
AND Asn.ASN_STATUS in ('SENT','RESENT')


RETURN @v_last_ship_date
END

So I have to execute this with:

SELECT dbo.GetLastShipDate('T010215004')

I want to execute it with

SELECT GetLastShipDate('T010215004')

What am I doing wrong?

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Mar 20, 2004

I create the following UDF just for learning purposes and I cannot seem to get it to return a value.

Stored Procedure

REATE PROCEDURE usp_GetXSection

@fWidth float,
@fHeight float,
@fResult float OUTPUT

AS
BEGIN
set @fResult = [dbo].[XSECTION](@fWidth, @fHeight)
END
GO


Ane the following UDF


CREATE FUNCTION XSECTION
(@Width float, @Height float)
RETURNS float
AS
BEGIN
RETURN (@Width * @Height)
END


I call it using ADO in a c++ application, but all returns empty

Any ideas? C++ code to follow.

Mike B


void CFormTemplateSetup::OnCalculate()
{
_CommandPtr pCmd(__uuidof(Command));
_ParameterPtr pWidth(__uuidof(Parameter));
_ParameterPtr pHeight(__uuidof(Parameter));
_ParameterPtr pResult(__uuidof(Parameter));

try
{
pCmd->ActiveConnection = GetDocument()->GetConnection();
pCmd->CommandText = _T("usp_GetXSection");
pCmd->CommandType = adCmdStoredProc;

_variant_t vWidth, vHeight;
vWidth.vt = VT_R4;
vHeight.vt = VT_R4;

vWidth.fltVal = 10;
vHeight.fltVal = 10;

pWidth = pCmd->CreateParameter(_T("@fWidth"), adInteger, adParamInput, sizeof(int), vWidth);
pHeight = pCmd->CreateParameter(_T("@fHeight"), adInteger, adParamInput, sizeof(int), vHeight);
pResult = pCmd->CreateParameter(_T("@fResult"), adDouble, adParamOutput, sizeof(float), vtMissing);

pCmd->Parameters->Append(pWidth);
pCmd->Parameters->Append(pHeight);
pCmd->Parameters->Append(pResult);

_variant_t vResult = pResult->Value;

float fArea = pResult->Value.fltVal;
CString csArea;
csArea.Format("Area = %d", fArea);

::AfxMessageBox(csArea);
}
catch(_com_error& e)
{
::AfxMessageBox(e.Description());
}
}

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Sep 8, 2005

Iam trying to create a geo-database.
For that i need to have a spatial data type called polygon which takes in values as int. so it can be declared as:
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How do i do that.
plz help.

---
Iam not real any more
Iam just an Illusion
---

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Apr 15, 2007

Hi,
Iam new to sql server. I want to create a user defined function to get date in a year(starting day of a week-i.e sunday date) when we give week number as argument. can any body help on this issue?

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Hi,
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