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MySQL, better to insert NULL or empty string?
... most database adapters / ORMs map NULL to None.
So things like:
print "Hello, %(title)s %(firstname) %(lastname)!" % databaserow
might result in "Hello, None Joe Doe!" To avoid it you need something like this code:
if databaserow.title:
print "Hello, %(title)s %(firstname) %(lastname)!" %...
What __init__ and self do on Python?
...
In this code:
class A(object):
def __init__(self):
self.x = 'Hello'
def method_a(self, foo):
print self.x + ' ' + foo
... the self variable represents the instance of the object itself. Most object-oriented languages pass this as a hidden parameter to the methods define...
Handlebars.js Else If
...rs
Example:
{{#conditions}}
{{#next condition1}}
Hello 1!!!
{{/next}}
{{#next condition2}}
Hello 2!!!
{{/next}}
{{#next condition3}}
Hello 3!!!
{{/next}}
{{#next condition4}}
Hello 4!!!
...
How to send a message to a particular client with socket.io
...o
Server Side:
io.sockets.in('user1@example.com').emit('new_msg', {msg: 'hello'});
The last thing left to do on the client side is listen to the "new_msg" event.
Client Side:
socket.on("new_msg", function(data) {
alert(data.msg);
}
I hope you get the idea.
...
jQuery pass more parameters into callback
...le callback function:
function callbackReceiver(callback) {
callback("Hello World");
}
function callback(value1, value2) {
console.log(value1, value2);
}
This calls the callback and supplies a single argument. Now you want to supply an additional argument, so you wrap the callback in clo...
Ignoring accented letters in string comparison
...diacritics.
"héllo" becomes "he<acute>llo", which in turn becomes "hello".
Debug.Assert("hello"==RemoveDiacritics("héllo"));
Note: Here's a more compact .NET4+ friendly version of the same function:
static string RemoveDiacritics(string text)
{
return string.Concat(
text.Norm...
Remove the last three characters from a string
...e a certain number of characters from the end of a string:
string.Concat("hello".Reverse().Skip(3).Reverse());
output:
"he"
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What can you do in MSIL that you cannot do in C# or VB.NET? [closed]
...S DECLARATION ===================
.class public auto ansi beforefieldinit Hello
{
.method public hidebysig static void Main(string[] args) cil managed
{
.entrypoint
// Code size 13 (0xd)
.maxstack 8
IL_0000: nop
IL_0001: ldstr "Hello World!"
IL_0006: call...
Difference between / and /* in servlet mapping url pattern
...ls two servlets to serve jsp and jspx. So to map http://host:port/context/hello
No exact URL servlets installed, next.
No wildcard paths servlets installed, next.
Doesn't match any extensions, next.
Map to the default servlet, return.
To map http://host:port/context/hello.jsp
No exact URL ser...
Difference between char* and const char*?
...
CASE 1:
char *str = "Hello";
str[0] = 'M' //Warning may be issued by compiler, and will cause segmentation fault upon running the programme
The above sets str to point to the literal value "Hello" which is hard-coded in the program's binary im...