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by: Bodza Bodza |
last post by:
I'm having an argument with an incumbent self-taught programmer that
it is OK to use null foreign keys in database design.
My take is the whole point of a foreign key is that it's not supposed
to be optional, it's very definition is it's a necessary link to the
parent table and part of the definition. If it's optional it shouldn't
be part of the definition of a table and should be in a linking table
instead.
Comments?
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by: Vinodh Kumar P |
last post by:
I understand the number of foreign keys allowed is restricted by the DBMS I
use.
In a general relational schema design perspective how many foreign keys a
table shall have?
If I have large number of foreign keys what anamolies it will lead to?
Is this crucial to identify all the foriegn key relationships for a table?
Vinodh
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by: Scott Ribe |
last post by:
I've got a problem which I think may be a bug in Postgres, but I wonder if
I'm missing something. Two tables, A & B have foreign key relations to each
other. A 3rd table C, inherits from A. A stored procedure updates a row in
C, adds a row each in B & C. I get an integrity violation. All the foreign
keys are deferrable, and the stored procedure is called from within a
transaction with constraints deferred. (And the foreign keys do refer to...
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by: Jim Hammond |
last post by:
I am passing the whole object instead or parameters in my select and update
methods.
I can get the updated object if I set UpdateMethod, let ASP.NET autogenerate
an update button, and then press update after making changes, but I don't
want that update button.
How can I get the updated object when the user presses one of my other
action buttons?
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by: Ole M |
last post by:
I'm having some trouble using the ObjectDataSource in ASP.NET 2.0.
I have a wrapper that contains the static methods for Select and Update. The
Update-method takes the business object as parameter.
When the Update-method is invoked by the ObjectDataSource, the object
referenced is not the same object returned by the Select-method, but a new
object with only the values from the Edit-template. So basically I get a
reference to a useless...
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by: Trail Monster |
last post by:
Ok, I've been searching the net now for several days and can't find how to do
this anywhere.
Version:
VS 2005 Professional Release, 2.0 Framework
Background:
I have a complex business object Employee that contains public properties
and several nested objects such as a Spouse object and a List of Coverage
objects.
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by: Anne Catterick |
last post by:
Hi,
I have an british ASP.Net 2.0 application which is doing what (should) be
very simple. But I am having issues.
On my page I have a GridView as follows (some tags excluded for easy reading):
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False"
DataSourceID="ObjectDataSource1" DataKeyNames="Id"
OnRowUpdated="GridView1_RowUpdated">
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by: Ian Davies |
last post by:
I have created a database with about 17 tables. I have been creating foreign
keys some of which have worked but when creating others I get the message
below
*************************
1005 (ER_CANT_CREATE_TABLE)
Cannot create table. If the error message refers to errno 150, table
creation failed because a foreign key constraint was not correctly formed.
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by: Richard Carpenter |
last post by:
I am working on a small project in which I am trying to implement a
data access layer through the use of a project dataset schema. Data
integrity and normalization will be handled through the use of SQL
Server stored procedures. Basically, for each data entity, I've written
_Get(), _Delete(), _Add() and _Update() stored procedures. The _Get()
procs return all data needed to display the information in a meaningful
manner to the user...
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by: Hystou |
last post by:
Most computers default to English, but sometimes we require a different language, especially when relocating. Forgot to request a specific language before your computer shipped? No problem! You can effortlessly switch the default language on Windows 10 without reinstalling. I'll walk you through it.
First, let's disable language synchronization. With a Microsoft account, language settings sync across devices. To prevent any complications,...
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by: jinu1996 |
last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven tapestry of website design and digital marketing. It's not merely about having a website; it's about crafting an immersive digital experience that captivates audiences and drives business growth.
The Art of Business Website Design
Your website is...
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by: Hystou |
last post by:
Overview:
Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows Update option using the Control Panel or Settings app; it automatically checks for updates and installs any it finds, whether you like it or not. For most users, this new feature is actually very convenient. If you want to control the update process,...
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by: tracyyun |
last post by:
Dear forum friends,
With the development of smart home technology, a variety of wireless communication protocols have appeared on the market, such as Zigbee, Z-Wave, Wi-Fi, Bluetooth, etc. Each protocol has its own unique characteristics and advantages, but as a user who is planning to build a smart home system, I am a bit confused by the choice of these technologies. I'm particularly interested in Zigbee because I've heard it does some...
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by: agi2029 |
last post by:
Let's talk about the concept of autonomous AI software engineers and no-code agents. These AIs are designed to manage the entire lifecycle of a software development project—planning, coding, testing, and deployment—without human intervention. Imagine an AI that can take a project description, break it down, write the code, debug it, and then launch it, all on its own....
Now, this would greatly impact the work of software developers. The idea...
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by: isladogs |
last post by:
The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM).
In this session, we are pleased to welcome a new presenter, Adolph Dupré who will be discussing some powerful techniques for using class modules.
He will explain when you may want to use classes instead of User Defined Types (UDT). For example, to manage the data in unbound forms.
Adolph will...
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by: conductexam |
last post by:
I have .net C# application in which I am extracting data from word file and save it in database particularly. To store word all data as it is I am converting the whole word file firstly in HTML and then checking html paragraph one by one.
At the time of converting from word file to html my equations which are in the word document file was convert into image.
Globals.ThisAddIn.Application.ActiveDocument.Select();...
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by: 6302768590 |
last post by:
Hai team
i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated we have to send another system
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by: muto222 |
last post by:
How can i add a mobile payment intergratation into php mysql website.
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