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Why is lazy evaluation useful?
... they're not going to be used. For example, I may pass three values into a function, but depending on the sequence of conditional expressions, only a subset may actually be used. In a language like C, all three values would be computed anyway; but in Haskell, only the necessary values are computed.
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PHP + MySQL transactions examples
...(mysql_error());
$query = "INSERT INTO employee (ssn,name,phone) values ('123-45-6789','Matt','1-800-555-1212')";
begin(); // transaction begins
$result = mysql_query($query);
if(!$result){
rollback(); // transaction rolls back
echo "transaction rolled back";
exit;
}else{
commit(...
Putty: Getting Server refused our key Error
...tNumber = 22,
HostName = "192.168.1.188",
UserName = "user123",
//Password = "Password1",
SshHostKeyFingerprint = @"ssh-rsa 2048 qu0f........................ddowUUXA="
};
ops.SshPrivateKeyPath = @"C:\temp\rsa-key-20190505.ppk";
using (Session session = ...
How do I return rows with a specific value first?
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For Postgres, this worked for me: ORDER BY id = 123 DESC, name ASC
– user1032752
Oct 6 '16 at 21:27
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How to define two angular apps / modules in one page?
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123
Only one AngularJS application can be auto-bootstrapped per HTML document. The first ngApp ...
How to click first link in list of items after upgrading to Capybara 2.0?
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123
Try the following:
within ".item" do
click_link("Agree", :match => :first)
end
Sources...
What is resource-ref in web.xml used for?
...endor specific deployment descriptor file
– abhihello123
Aug 1 '16 at 11:48
1
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How to specialize std::hash::operator() for user-defined type in unordered containers?
...ap<Key, Value>
one has to provide operator==(Key, Key) and a hash functor:
3 Answers
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What is the correct way to document a **kwargs parameter?
...rgs argument, but a completely normal one.
– bugmenot123
Jul 15 '19 at 12:26
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decimal vs double! - Which one should I use and when? [duplicate]
...ut at 1 million for a float.
A 15 digit monetary value:
£1,234,567,890,123.45
9 trillion with a double. But with division and comparisons it's more complicated (I'm definitely no expert in floating point and irrational numbers - see Marc's point). Mixing decimals and doubles causes issues:
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