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Data Points: SQL Server User-defined Functions

Posted By:      Posted Date: August 21, 2010    Points: 0   Category :ASP.Net

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User Defined Functions in Microsoft SQL Server

User Defined Functions are compact pieces of Transact SQL code, which can accept parameters, and return either a value, or a table. They are saved as individual work units, and are created using standard SQL commands. Data transformation and reference value retrieval are common uses for functions. LEFT, the built in function for getting the left part of a string, and GETDATE, used for obtaining the current date and time, are two examples of function use. User Defined Functions enable the developer or DBA to create functions of their own, and save them inside SQL Server.

Data Points: SQL Server Management Objects


SQL Server Management Objects offer developers a robust toolset for backing up and restoring databases, and issuing DDL commands, as John Papa explains.

John Papa

MSDN Magazine June 2007

Data Points: Report Controls in SQL Server 2005 Reporting Services


Reporting has always been one of the dark arts of development. The tools typically seem to do just enough to get you to a certain point, then leave you to find workarounds to solve more complex issues.

John Papa

MSDN Magazine July 2006

Data Points: Designing Reports with SQL Server Reporting Services 2005


Many applications require some degree of integration with a reporting tool. A good solution, SQL ServerT Reporting Services 2005, provides Web-based reports and can be integrated into both Windows® Forms and Web-based applications.

John Papa

MSDN Magazine June 2006

Data Points: SQL Server 2005 XML Support, Exception Handling, and More


SQL Server 2005 includes several important improvements to the Transact-SQL (T-SQL) language. One added feature is a new kind of trigger that fires when data definition language (DDL) statements run.

John Papa

MSDN Magazine May 2006

Data Points: XML Features in SQL Server 2000


SQL ServerT 2000 includes several XML features that let you transform relational rowsets into hierarchical XML documents, read XML documents, and bulk load data via XML. For example, you can pass an XML document to a stored procedure, join the XML to some tables and return a rowset, or even modify data in the database.

John Papa

MSDN Magazine June 2005

Creating a table-valued function on a user defined type in SQL Server CLR

We would like to be able to create a table-valued function on a user defined type.  We would like the syntax in SQL to look like it works for the XML nodes function:   DECLARE @myXml XML = '<a><b>1</b><b>2</b><b>3</b></a>' ; SELECT  node.query('text()') FROM    @myXml.nodes('a/b') nodes (node) ;   In other words, in the FROM clause, we can access the "nodes" method of the xml variable and it returns a rowset. Thanks!

User Defined Data Type - using SMO *** NEED HELP ! ***

Hi,Is it possible to script out the User Defined Data Types via SMO in .NET and specifically VB.Net?  I have not been able to find some examples on how to do this.  If you have some experience with this, pleasepost some examples or provide links where I can find this information.Thank you in advance.-Sydney

Best practice for user defined error messages in SQL Server 2005/2008 --Need help

My requirement is to setup a standard practice for our team in handling DB erros and also  user defined messages. We are handling exceptions using Raiseerror method with in Try and Catch blocks.  For user defined message, we are using Sp_addmessage to add our application specific error/warning messages with error codess>80000.  Ex: 80001 | Company name already exists. please check. Here is the sample code ********************************************************************* CREATE PROCEDURE [dbo].[usp_CompanyProfile_insert]  -- Add the parameters for the stored procedure here  (@company_name VARCHAR(50),  @company_code VARCHAR(3),  @user_id INT  ) AS BEGIN  -- SET NOCOUNT ON added to prevent extra result sets from  -- interfering with SELECT statements.  SET NOCOUNT ON;  BEGIN TRY -- Begin Try Block      -- Validate company name   IF EXISTS (SELECT company_id FROM companyprofile WHERE company_name = @company_name)    RAISERROR(90021, 16, 1)      INSERT INTO companyprofile (company_name,       company_code,       createdby)   VALUES(@company_name,     @company_code,     @user_id)    END TRY  -- End Try Block &

SSIS User Defined Data Type (Alias Data Types) and OLE DB Command validation

Hello everyone, I've been having an issue with trying to run my SSIS package on a server, and it seems to be failing on the OLE DB Command step.  What we have in our SQL 2005 DB, is a User-Defined Data Type (base type char(7)) and the OLE DB Command is supposed to call a proc that passes in a value of this data type. ie:  CREATE PROCEDURE myProcedure ( @passedInFromSSIS MY_DATATYPE ) AS .... In my SSIS package, I have the type defined as DT_STR with a length of 7.  Now, when I run the package locally (via Visual Studio), the process runs with success.  However, once the package is deployed on a server and run from an application (note: it is run under a different user), the process fails on a validation step with a "Invalid Parameter Number" error. Now, if I change the input parameter in my proc to the base type of the user-defined data type, the process works again. Has anybody run into a similar issue or know what may be causing this issue?  I first suspected perhaps I needed to grant permissions on the user-defined data type (since I was able to run it under my security context, but not under the application's), however noticed that there isn't security tied to the types.  Any other thoughts?  Please let me know if you need further explanation.  Thanks!

SQL Server user-defined aggregate returns an error if aggregating 0 rows

I have this SQL Server user-defined aggregate:

[SqlUserDefinedAggregate(Format.UserDefined, Name="median", IsInvariantToDuplicates=false, IsInvariantToNulls=true, IsInvariantToOrder=true, IsNullIfEmpty=true, MaxByteSize=8000)] 
public class MedianCalculator : IBinarySerialize { 
    private List<double> values; 
    public void Init() { 
        values = new List<double>(); 
    public void Accumulate(SqlDouble value) { 
        if (!value.IsNull) 
    public void Merge(MedianCalculator other) { 
    public SqlDouble Terminate() { 
        if (values == null || values.Count == 0) 
            return SqlDouble.Null; 
        return (values[(int)Math.Floor((values.Count - 1) / 2.0)] + values[(int)Math.Ceiling((values.Count - 1) / 2.0)]) / 2.0; 
    public void Read(BinaryReader r) { 
        int c = r.ReadInt32(); 
        values = new List<double>(c); 
        for (int i = 0; i < c; i++) 
    public void Write(BinaryWriter w) { 
        for (int i = 0; i < values.Count; i++) 
After deploying this aggregate, I try to run this query:

Data Points: Composing WPF DataGrid Column Templates for a Better User Experience


Julie Lerman struggled for days with some vexing user experience problems related to the WPF DataGrid, so she's saving you the bother by explaining how she solved them.

Julie Lerman

MSDN Magazine April 2011

how to pass a user defined object as an argument to a web server?


I have the following scenario:

1. my web server is in c#, and my web server client is in Java

2. on the java side, I have a user defined object,  (it is implemented as a java bean) and i would like to pass this object, as an argument to one of the web server methods.

3. the problem however is, that on the C# side, i get a compilation error, saying that the type or namespace could not be found.

I read some forum threads saying that it should be serialised, but i have no idea of what to do, to be quite honest. Could someone please help by either explanation or a helpful link with an example?

Many thanks,


MS SQL Server: Disconnect Users From Database - Kill User Session

If you ever wanted to restore your database from a SQL backup file (.bak), but there are still users connected to your database, the backup operation will fail causing the error: Exclusive access could not be obtained because the database is in use.
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