.NET Tutorials, Forums, Interview Questions And Answers
Welcome :Guest
Sign In
Win Surprise Gifts!!!

Top 5 Contributors of the Month
david stephan
Gaurav Pal
Post New Web Links

Function within CHECK constraint

Posted By:      Posted Date: September 09, 2010    Points: 0   Category :Sql Server
Hi. SQL Server 2005 and heavily edited for security. I have Client and Contact tables and a Link table to give a many-to-many relationship. Each client may have many contacts, but only one main contact, and I am having problems trying to enforce that constraint by using a CHECK constraint calling a function to detect multiple main contacts. CREATE TABLE [dbo].[Link]([Client] int NOT NULL, [Contact] int NOT NULL, [IsMain] bit NOT NULL) The primary key is [Client] + [Contact]. CREATE FUNCTION [dbo].[LinkCheckFunction] (@Client int) RETURNS bit AS BEGIN; RETURN CASE WHEN ((SELECT COUNT([IsMain]) FROM [dbo].[Link]         WHERE (([Client] = @Client) AND ([IsMain] = 1))) > 1) THEN 1 ELSE 0 END; END; ALTER TABLE [dbo].[Link] ADD CONSTRAINT [CK_Link] CHECK ([dbo].[LinkCheckFunction] ([Client]) = 0) This does not prevent updating of existing rows or insertion of new rows which would result in a client having multiple main contacts. However, writing the function without a parameter and checking the entire table for cases of a client with multiple main contacts does work. There was a post 'Check constraint across multiple records?' by Mark SQL Server on March 12, 2009 on this issue. As far as I can see, my approach matches some of the replies to that post, but does not work. Any ideas? Please note that the post is heavily edited fo

View Complete Post

More Related Resource Links

SQL DIAGOSITC MANAGER tools capture "SELECT *" statement while ALTER / ADD CHECK CONSTRAINT is execu

Hello  ,   I exectuted the code(alter/add with check)  below in SSMS . My_table has 200 millions records . While running the alter/add with check query  the server crashed and the “SQL DIAGOSITC MANAGER” which run on the top of sql serever alert the DBA that select * from my_table was obtained from the last command issued by the user using a DBCC command.      Where does the select * from my_table comes from ? I didn’t excuted select * from my_table at all .   After the sql serever re started I was able to run the command below with out any problem. I checked the SQL PROFILER for the trace there is no “select * from my_table” .   So again where this select * from my_table comes from ?   Here is my initial query ----------------------------------------------------------------- ALTER TABLE [Dbo].my_table WITH CHECK ADD  CONSTRAINT [FK_key1] FOREIGN KEY([Key1]) REFERENCES [Dbo].[Dim_table1] ([Key1]) GO   ALTER TABLE [Dbo].my_table CHECK CONSTRAINT [FK_key1] GO   ALTER TABLE [Dbo].my_table WITH CHECK ADD  CONSTRAINT [FK_key2] FOREIGN KEY([key2]) REFERENCES [Dbo].[Dim_table2] ([key2]) GO   ALTER TABLE [Dbo].my_table CHECK CONSTRAINT [FK_key2] GO   ALTER TABLE [Dbo].my_table WITH CHECK ADD  CONSTRAINT [FK_key3] FOREIGN KEY([d], [c], [r], [g]) REFERENCES [Dbo].my

Query DB and update Check Box List on JS/jQuery Function

Hey guys.  I'm not sure if this is the right forum to post this in but I've come to a roadblock in my app and I'm not sure which way I should go.  Currently, I have a slider control and two text boxes used to set the Start and End times of a section of a video.  Let's say the video is of some Music Awards.  In my database, I've tagged the start and end time of each celebrities on-screen appearance.  When the user adjusts their start and end times on the page, I want to query the database table and pull back all celebrities within that range.  The problem is I don't know how to do this in JS.Can I use the Check Box List and bind the values to it?  Do I need to render a table of Check Boxes in JavaScript?  Do I call the Server-Side code via Ajax and then partially render the page?Any help, comments or suggestions would be great.

Whitespace Check constraint problem

I have a table called IntNotes that including column Key,Notes,Keytable and few others. Key is Primary Key. Notes - Nvarchar(max),not null) I have a check constraint on Notes column. ALTER TABLE [dbo].[IntNotes] WITH NOCHECK ADD CHECK ((NOT [Notes] like '' AND NOT [Notes] like ' %' AND NOT [Notes] like '% ')). But when i am adding following values getting error "Error occured storing IntNotes data, the Violated constraints follows.[Notes] like '' AND NOT [Notes] like ' %' AND NOT [Notes] like '% " Value KeyTable = 881 Key =2250 Notes = 'Received signed 3yr contract priced at $12500/13500/14250. please send invoice for $12,500'. Can anyone suggest me what steps should i have to follow? Thanks you

Using a CompareValidator to check input is a valid date

The CompareValidator can do more than just compare two controls. You can also compare it against several of the main .net data types such as Date, Integer, Double and Currency.

To do this you would set Operator="DataTypeCheck" and instead of setting the ControlToCompare or ValueToCompare attributes as you normally would you use the Type="Date" (or any of the data types I have listed above).

Check All with JQuery and a Asp.Net GridView

Display a Grid on the screen with a checkbox in each row. At the bottom of the page have "Check All" button.

Typically if I need to do anything interesting I use a template column. So my GridView will look like the one below (most other columns removed for readability). The only interesting point to note is the CssClass="ApprovalCheckBox" in the CheckBox ItemTemplate.

check box control


Hi ,

I have a three check box in my web form ,i need to choose only one check box, if i choose one check box

another 2 check box automatically unchecked

can i use jquery for check box

I thought this would be simple... Trying to create a login does an ajax check before submit


I have the standard .net login control that is working.  (Still learning .net after 15yrs of classic)

What I want to do is OnButtonClick run a javascript function (to do an ajax call to the db to check if login is valid or not) and if it returns true, then submit the form normally, else don't submit. The piece that I can't figure out, is how to correctly override the default click even to hit my JS routine and then submit the form properly afterwards.

Thanks ahead of time

how to check a textbox value in jquery?



I want to perform some action when an asp.net textbox value length is greater than 1 character. And for this I wanted to know how to write this check in jquery?

I have created a check like below-

if ($('[id=txtUserInput]').val().length > 2)
{ do some work...} 

But its giving me the following error

$("[id=txtUserInput]").val() is undefined

Can anybody let me know the right way of doing this?



Content page control passes as argument to javascript function


Here is the content page:


<%@ Page Language="C#" MasterPageFile="~/MasterPage.master" AutoEventWireup="true" CodeFile="JavaDynamicCopyValue.aspx.cs" Inherits="JavaDynamicCopyValue" Title="Untitled Page" %>
<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
 <script type="text/javascript" >
 function copyValue(input, output )
   ouput.value = input.value;
   return true;
 <asp:TextBox ID="txt1" runat="server" onchange="copyValue(this,document.getElementById('<%=txt2.ClientID%>'))"></asp:TextBox>
    <br />
    <br />
    <asp:TextBox ID="txt2" runat="server"></asp:TextBox>


I got a javascript run time error says output is undefined. if I view source of the page, the txt1 markup became:

<input name="ctl00$ContentPlaceHol

How to check for null/empty strings on dynamic objects?


What is the proper way to check for null or empty strings on dynamic objects? This is the only solution I've found so far:

if (admin.PasswordHash.GetType() == typeof(DBNull) || admin.PasswordHash == string.Empty)

If the field is null, the object returned is DBNull.Value, but if the field is empty string, it's return as a System.String object. This makes it impossible to do regular "admin.PasswordHash == DBNull.Value" check, as that will fail whenever the field has been set to empty string. Is my example the right (and only) way to go?

Automatically redirect to HTTPS and check if SSL is active



I've set in the web.config:

    <!-- User Authentication -->
    <authentication mode="Forms">
      <forms loginUrl="~/Page/View/Content/Login.aspx" timeout="2880" requireSSL="true" />

This works fine. If there is no ssl connection, the login form doesn't continue. But I would like to check if ssl is active (in codebehind) and, if it's possible, to automatically the user to the https page if he's currently on http. (I could do this job by manually redirect with page.response("https://url.../login.aspx"); but this is not really generic. For example if the webapp is moved to another domain it doesn't work anymore... I'm looking for something like: FormsAuthentication.RedirectWithSSL(); or so... :D)


how to check which pages of my site that my visitor visiting at the moment


 Hi all, and thanks a lot for the replies since now. I have a new question :

I prepared a simple instant messaging system for my web site and i would like to learn which visitor (registered member) is at which page of my site. 

For example : 

Uid:10000, Username:donald, NameSurname:Donald DUCK is a registered and signed in visitor.

I need the code which tells me that visitor is at which page (ie. images.aspx?imageid=143223)

Sorry for my poor english, and let me know if i should explain more clearly :)

Have a good evening...

connection to SQL Server files (*.mdf) require SQL server express 2005 to function properly.


I dont have the SQL EXPRESS installed instead I have SQL Standard Edition.

 I have two SQL Server instances installed.

 1- UserLT (this is sql 2000)
2- UserLT\SQL2005 (this is SQL 2005 named instance)

But when i try to add a database to my VS website project I get the following error:

Connection to SQL Server files (*.mdf) require SQL server express 2005 to function properly. please verify the installation of the component or download from the URL: go.microsoft.com/fwlink/?linkId=4925

I went in Tools>Opetions>DataBase tools>Data Connection>Sql Server Instance Name (blank for default)

and changed the "SQLEXPRESS" to "USERLT\SQL2005".

But I still get the same error message. Any ideas how i can resolve this issue?

Public Shared function doubt????

I am using VB.net/ASP.NET and SQL Server 2000 for a web application.

For populating the dropdowns, I wrote a Public Shared function LoadDDL(), in which I pass the dataset and dropdown name to set.

I have my doubts that this function will produce unexpected results for concurrent users. And will mix the results among sessions because it is a Shared function.

I am confused here. Is it the right way to go?

Please advice. Thanks in advance.


Trim function in C Sharp

How do i use "trim" function in C Sharp? I have a string and i want to strip off spaces from the end of the string. Any idea how do i do it??


Tools for memory error check in VS2005


Dear all,

I am going to write vs2005 program with ASP.NET and C++.

As you know that C++ will involve a lot of memory error handling.

Do you know is there any tools for checking memory error in Code Behind C++??

Team System: Check-in Notes and Policies


Learn how to add check-in notes and check-in policy support to a Word add-in, in this fifth and final installment of an ongoing discussion.

Brian A. Randell

MSDN Magazine Launch 2008

ASP.NetWindows Application  .NET Framework  C#  VB.Net  ADO.Net  
Sql Server  SharePoint  Silverlight  Others  All   

Hall of Fame    Twitter   Terms of Service    Privacy Policy    Contact Us    Archives   Tell A Friend