大约有 40,000 项符合查询结果（耗时：0.0785秒） [XML]
How to sort with a lambda?
...nclude <iostream>
#include <sstream>
struct Foo
{
Foo() : _i(0) {};
int _i;
friend std::ostream& operator<<(std::ostream& os, const Foo& f)
{
os << f._i;
return os;
};
};
typedef std::vector<Foo> VectorT;
std::string ...
C# version of java's synchronized keyword?
...s allows more granular usage, and allows use of Monitor.Wait/Monitor.Pulse etc to communicate between threads.
A related blog entry (later revisited).
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How do I split a string, breaking at a particular character?
...elds = input.split('~');
var name = fields[0];
var street = fields[1];
// etc.
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Sort hash by key, return hash in Ruby
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In Ruby 2.1 it is simple:
h.sort.to_h
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How to split long commands over multiple lines in PowerShell
...loy.exe" `
-verb:sync `
-source:contentPath="c:\workspace\xxx\master\Build\_PublishedWebsites\xxx.Web" `
-dest:contentPath="c:\websites\xxx\wwwroot,computerName=192.168.1.1,username=administrator,password=xxx"
White space matters. The required format is Space`Enter.
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How to change a table name using an SQL query?
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Use sp_rename:
EXEC sp_rename 'Stu_Table', 'Stu_Table_10'
You can find documentation on this procedure on MSDN.
If you need to include a schema name, this can only be included in the first parameter (that is, this cannot be use...
Explaining Apache ZooKeeper
...e-light, meaning that mechanisms such as leader election, locks, barriers, etc. are not already present, but can be written above the ZooKeeper primitives.
If the C/Java API is too unwieldy for your purposes, you should rely on libraries built on ZooKeeper such as cages and especially curator.
Whe...
Convert string with commas to array
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Convert all type of strings
var array = (new Function("return [" + str+ "];")());
var string = "0,1";
var objectstring = '{Name:"Tshirt", CatGroupName:"Clothes", Gender:"male-female"}, {Name:"Dress", CatGroupName:"Clothes", Gend...
What's an appropriate HTTP status code to return by a REST API service for a validation failure?
...inced that this is an appropriate code for a validation failure, what do y'all recommend?
7 Answers
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MySQL - Using COUNT(*) in the WHERE clause
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There can't be aggregate functions (Ex. COUNT, MAX, etc.) in A WHERE clause. Hence we use the HAVING clause instead. Therefore the whole query would be similar to this:
SELECT column_name, aggregate_function(column_name)
FROM table_name
WHERE column_name operator value
GROUP ...