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Why there can be only one TIMESTAMP column with CURRENT_TIMESTAMP in DEFAULT clause?
...
We can give a default value for the timestamp to avoid this problem.
This post gives a detailed workaround:
http://gusiev.com/2009/04/update-and-create-timestamps-with-mysql/
create table test_table(
id integer not null auto_increment primary key,
stamp_created timestamp ...
How to remove array element in mongodb?
...
Try the following query:
collection.update(
{ _id: id },
{ $pull: { 'contact.phone': { number: '+1786543589455' } } }
);
It will find document with the given _id and remove the phone +1786543589455 from its contact.phone array.
You can use $unset to unset the value i...
How to call a shell script from python code?
... Note: it's preferable to pass subprocess.call() a list rather than a string (see command to Hugo24 below for the example and reasons).
– Jim Dennis
Sep 23 '10 at 11:30
1
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How does tuple comparison work in Python?
...more beginner friendly with an example
a = ('A','B','C') # see it as the string "ABC"
b = ('A','B','D')
A is converted to its corresponding ASCII ord('A') #65 same for other elements
So,
>> a>b # True
you can think of it as comparing between string (It is exactly, actually)
the sa...
Do NSUserDefaults persist through an Update to an app in the Appstore?
...a, NSUserDefaults is the best way to save data such as preferences, dates, strings etc. If you are looking to save images and files, the file system is a better bet.
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What's the difference between “declare class” and “interface” in TypeScript
...n we have the following interface:
interface test {
foo: number,
bar: string,
}
The objects which we define which have this interface type need to match the interface exactly:
// perfect match has all the properties with the right types, TS compiler will not complain.
const obj1: test = { ...
MVC 5 Access Claims Identity User Data
...something like this:
public static class UserExtended
{
public static string GetFullName(this IPrincipal user)
{
var claim = ((ClaimsIdentity)user.Identity).FindFirst(ClaimTypes.Name);
return claim == null ? null : claim.Value;
}
public static string GetAddress(this ...
实现一个简单的服务端推方案 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...便主动通知Nginx，并把相应的标识（比如一个自增的整数ID）保存在Nginx共享内存中，接下来，Nginx不会再去轮询数据库，而是改为轮询本地的共享内存，通过比对标识来判断是否有新消息，如果有便给客户端发出响应。
注：服...
Tool for generating railroad diagram used on json.org [closed]
...first railroad diagram you show, you would use the code:
object ::= '{' ((string ':' value ) ( ',' string ':' value )*)? '}'
Then you could go on to define string and value using string ::= ... and value ::= ... The references are all shown.
Check out some of the example diagrams on the page. ...
Advantages and disadvantages of GUID / UUID database keys
...ses would have been made a lot easier if all the database keys had been GUID / UUID values. I've considered going down this path a few times, but there's always a bit of uncertainty, especially around performance and un-read-out-over-the-phone-able URLs.
...