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Best way to store date/time in mongodb
I've seen using strings, integer timestamps and mongo datetime objects.
2 Answers
2
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Linux下安装项目管理工具Redmine - 开源 & Github - 清泛网 - 专注C/C++及内核技术
...My account里可以修改成其它语言。
启动WEB服务
# ruby script/server webrick -e production
或# ruby /usr/local/redmine/script/server webrick -e production
停止web服务方法：在当前启动窗口按ctrl+C
访问http://ip:3000/
初始用户名/密码：admin/admin
这...
How do I find out which computer is the domain controller in Windows programmatically?
...PrincipalContext context = new PrincipalContext(ContextType.Domain))
{
string controller = context.ConnectedServer;
Console.WriteLine( "Domain Controller:" + controller );
}
This will list all the users in the current domain:
using (PrincipalContext context = new PrincipalContext(Context...
Difference between a Structure and a Union
...re that value.
union foo {
int a; // can't use both a and b at once
char b;
} foo;
struct bar {
int a; // can use both a and b simultaneously
char b;
} bar;
union foo x;
x.a = 3; // OK
x.b = 'c'; // NO! this affects the value of x.a!
struct bar y;
y.a = 3; // OK
y.b = 'c'; // OK
ed...
Does delete on a pointer to a subclass call the base class destructor?
...n this will happen when the containing object is destroyed.
class A
{
char *someHeapMemory;
public:
A() : someHeapMemory(new char[1000]) {}
~A() { delete[] someHeapMemory; }
};
class B
{
A* APtr;
public:
B() : APtr(new A()) {}
~B() { delete APtr; }
};
class C
{
A Amemb...
What's the difference between ASCII and Unicode?
...t their language (to support "é", in French, for example). Just using one extra bit doubled the size of the original ASCII table to map up to 256 characters (2^8 = 256 characters). And not 2^7 as before (128).
10000010 -> é (e with acute accent - 130)
10100000 -> á (a with acute accent - 16...
Why does Git treat this text file as a binary file?
...ut need of a null (00h) byte for anything other than the nul char (the 'C' string terminator). Thus Git's text definition is that the content (well the first 1k bytes) should not have a null byte when utf-8 encoded. Try stackoverflow.com/questions/2241348/… for a fun read. My original comment ref...
Concatenate multiple result rows of one column into one, group by another column [duplicate]
...
Simpler with the aggregate function string_agg() (Postgres 9.0 or later):
SELECT movie, string_agg(actor, ', ') AS actor_list
FROM tbl
GROUP BY 1;
The 1 in GROUP BY 1 is a positional reference and a shortcut for GROUP BY movie in this case.
string_agg() ...
Use '=' or LIKE to compare strings in SQL?
...he (almost religious) discussion, if you should use LIKE or '=' to compare strings in SQL statements.
9 Answers
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How to use NULL or empty string in SQL
I would like to know how to use NULL and an empty string at the same time in a WHERE clause in SQL Server. I need to find records that have either null values or an empty string. Thanks.
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