大约有 7,000 项符合查询结果（耗时：0.0146秒） [XML]
To ternary or not to ternary? [closed]
...subconscious rules I tend to follow are:
Only evaluate 1 expression - so foo = (bar > baz) ? true : false, but NOT foo = (bar > baz && lotto && someArray.Contains(someValue)) ? true : false
If I'm using it for display logic, e.g. <%= (foo) ? "Yes" : "No" %>
Only really ...
Create new user in MySQL and give it full access to one database
...mysql -e "SELECT 1"
or print statement from the standard input:
$ echo "FOO STATEMENT" | mysql
If you've got Access denied with above, specify -u (for user) and -p (for password) parameters, or for long-term access set your credentials in ~/.my.cnf, e.g.
[client]
user=root
password=root
Sh...
What is stdClass in PHP?
...eturns an StdClass instance.
<?php
//Example with StdClass
$json = '{ "foo": "bar", "number": 42 }';
$stdInstance = json_decode($json);
echo $stdInstance->foo . PHP_EOL; //"bar"
echo $stdInstance->number . PHP_EOL; //42
//Example with associative array
$array = json_decode($json, true);
ec...
Loading a properties file from Java package
... prop = new Properties();
InputStream in = getClass().getResourceAsStream("foo.properties");
prop.load(in);
in.close();
(Add all the necessary exception handling).
If your class is not in that package, you need to aquire the InputStream slightly differently:
InputStream in =
getClass().getReso...
What are C++ functors and their uses?
...function, to create functors from functions and methods, like this:
class Foo
{
public:
void operator () (int i) { printf("Foo %d", i); }
};
void Bar(int i) { printf("Bar %d", i); }
Foo foo;
boost::function<void (int)> f(foo);//wrap functor
f(1);//prints "Foo 1"
boost::function<void (i...
Similar to jQuery .closest() but traversing descendants?
...
If by "closest" descendant you mean the first child then you can do:
$('#foo').find(':first');
Or:
$('#foo').children().first();
Or, to look for the first occurrence of a specific element, you could do:
$('#foo').find('.whatever').first();
Or:
$('#foo').find('.whatever:first');
Really t...
Why do you not use C for your web apps?
...isn't a convenient language for manipulating strings.
Compare C#:
string foo = "foo";
string bar = "bar";
string foobar = foo + bar;
Corresponding C:
const char* foo = "foo";
const char* bar = "bar";
char* foobar = (char*)malloc(strlen(foo)+strlen(bar)+1);
strcpy(foobar, foo);
strcat(foobar, fo...
Can I change a private readonly field in C# using reflection?
...
You can:
typeof(Foo)
.GetField("bar",BindingFlags.Instance|BindingFlags.NonPublic)
.SetValue(foo,567);
share
|
improve this answer
...
How to implement static class member functions in *.cpp file?
...
Try this:
header.hxx:
class CFoo
{
public:
static bool IsThisThingOn();
};
class.cxx:
#include "header.hxx"
bool CFoo::IsThisThingOn() // note: no static keyword here
{
return true;
}
...
Convert timestamp to date in MySQL query
...n MYSQL
Make the table with an integer timestamp:
mysql> create table foo(id INT, mytimestamp INT(11));
Query OK, 0 rows affected (0.02 sec)
Insert some values
mysql> insert into foo values(1, 1381262848);
Query OK, 1 row affected (0.01 sec)
Take a look
mysql> select * from foo;
+--...