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Return 0 if field is null in MySQL
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Use IFNULL:
IFNULL(em>x m>pr1, 0)
From the documentation:
If em>x m>pr1 is not NULL, IFNULL() returns em>x m>pr1; otherwise it returns em>x m>pr2. IFNULL() returns a numeric or string value, depending on the contem>x m>t in which it is used.
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Python - Create a list with initial capacity
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Hey. It presumably can be em>x m>pressed in Python, but nobody has yet posted it here. haridsv's point was that we're just assuming 'int * list' doesn't just append to the list item by item. That assumption is probably valid, but haridsv's point was that we...
Getting the last revision number in SVN?
... echo "<pre>$output</pre>";
?>
You can get the output in m>X m>ML like so:
$output = `svn info $url --m>x m>ml`;
If there is an error then the output will be directed to stderr. To capture stderr in your output use thusly:
$output = `svn info $url 2>&1`;
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Pointer to class data member “::*”
...ions can be used in pluggable architectures, but once again producing an em>x m>ample in a small space defeats me. The following is my best (untested) try - an Apply function that would do some pre &post processing before applying a user-selected member function to an object:
void Apply( SomeClass ...
public friend swap member function
...here is! We can use a friend function, and find it through ADL:
namespace m>x m>yz
{
struct myclass
{
friend void swap(myclass&, myclass&);
};
}
When we want to swap something, we associate† std::swap and then make an unqualified call:
using std::swap; // allow use of st...
Rails Model find where not equal
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In Rails 4.m>x m> (See http://edgeguides.rubyonrails.org/active_record_querying.html#not-conditions)
GroupUser.where.not(user_id: me)
In Rails 3.m>x m>
GroupUser.where(GroupUser.arel_table[:user_id].not_eq(me))
To shorten the length, you co...
What is so special about Generic.m>x m>aml?
.... on Vista using the Aero theme, the dictionary is called Aero.NormalColor.m>x m>aml, on m>X m>P using the default theme it is Luna.NormalColor.m>x m>aml. If the style is not found in the theme dictionary, it looks in Generic.m>x m>aml i.e for controls whose look doesn't depend on the theme.
This only applies to any c...
PHP - Check if two arrays are equal
I'd like to check if two arrays are equal. I mean: same size, same indem>x m>, same values. How can I do that?
15 Answers
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What is a Lambda?
... the secrets of C# question, but I have yet to find a good definition and em>x m>planation of what they are in the first place.
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When to use std::forward to forward arguments?
C++0m>x m> shows an em>x m>ample of using std::forward :
3 Answers
3
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