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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: wwj |
last post by:
void main()
{
char* p="Hello";
printf("%s",p);
*p='w';
printf("%s",p);
}
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by: Manish Jain |
last post by:
Platform : ASP.Net/C#
void SomeFunction(DateTime date)
{
string text = date.ToString(); //This crashes if date is null
}
I am using a construct similar to above. I want to check if the date is null
or nor before processing it, but I am not able to figure out the syntax.
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by: Kevin Cline |
last post by:
Why, oh why is it necessary to test an event for null before raising
it?
Why isn't that case handled automatically, instead of forcing
developers to write three lines of wasted boilerplate code every time
an event is raised:
if (SomethingChanged != null) // wasted code
{ // more waste
SomethingChanged(...)
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by: ___Newbie___ |
last post by:
Hello,
Why can't a string handle null values? Do I really need to check with
IsDBNull() for null values?
e.g.
fieldName = reader.GetString(0);
if (!reader.IsDBNull(1))
{
fieldNationality = reader.GetString(1); // Exception here! for null
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by: wapsiii |
last post by:
I'm unsure how best to handle dates from my webforms to my database.
Often I have a textbox and a datepicker on a webform. Upon postback
dates are received in string format (like DD-MM-YYYY). Ultimately the
dates need to be stored in a datetime/smalldatetime field in the sql
server. However, first I pass then dates to the db via a business
layer where the date properties are of type datetime.
I've explored several ways to handle this...
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by: Dean Slindee |
last post by:
I am looking for the "right" way to handle inserting and presenting null
date values.
Public Const c_NullDate As Date = #12:00:00 AM#
If I set the value of a date variable in an SQL Server insert statement to
c_NullDate, the insert statement works. When I re-read the row and display
the inserted date value in a text box, the string "1/1/1900" is displayed.
If one wanted the textbox to display an empty string, how should either the
insert...
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by: John |
last post by:
I just cannot manage to perform a SELECT query with NULL parameter...
My CATEGORY table does have one row where TCATEGORYPARENTID is null (real DB
null value).
TCATEGORYID and TCATEGORYPARENTID are uniqueidentifier columns.
My questions:
- is Type="Object", below, necessary?
- what shall I specify for DefaultValue in my function? I tried everything.
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by: p.lavarre |
last post by:
Q: The C idea of (pv != NULL) is said most directly in Python ctypes
how?
A: We are of course supposed to write something like:
def c_not_null(pv):
return (ctypes.cast(pv, ctypes.c_void_p).value != None)
Yes?
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by: coomberjones |
last post by:
I have a few std::strings that I am using to store raw binary data,
each of which may very well include null bytes at any point or
points. I want to slap them together into a single string, so I tried
a std::ostringstream:
std::ostringstream oss;
oss << x << y << z;
std::string result ( oss.str() );
The result shows that feeding the ostringstream with a string just
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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: Oralloy |
last post by:
Hello folks,
I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>".
The problem is that using the GNU compilers, it seems that the internal comparison operator "<=>" tries to promote arguments from unsigned to signed.
This is as boiled down as I can make it.
Here is my compilation command:
g++-12 -std=c++20 -Wnarrowing bit_field.cpp
Here is the code in...
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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: 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: adsilva |
last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
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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: bsmnconsultancy |
last post by:
In today's digital era, a well-designed website is crucial for businesses looking to succeed. Whether you're a small business owner or a large corporation in Toronto, having a strong online presence can significantly impact your brand's success. BSMN Consultancy, a leader in Website Development in Toronto offers valuable insights into creating effective websites that not only look great but also perform exceptionally well. In this comprehensive...
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