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MySQL和MongoDB设计实例进行对比 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...表来单独保存。
CREATE TABLE IF NOT EXISTS `mobiles` (
`id` int(10) unsigned NOT NULL AUTO_INCREMENT,
`name` VARCHAR(100) NOT NULL,
`brand` VARCHAR(100) NOT NULL,
PRIMARY KEY (`id`)
);
CREATE TABLE IF NOT EXISTS `mobile_params` (
`id` int(10) unsigned NOT NULL A...
PHP去除字符串中的最后一个字符 - 更多技术 - 清泛网 - 专注C/C++及内核技术
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substr — 返回字符串的子串
string substr ( string $string , int $start [, int $length ] )
返回字符串 string 由 start 和 length 参数指定的子字符串。
strlen — 获取字符串长度
int strlen ( string $string )
返回给定的字符串 string 的长度。
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内网时间同步问题 - 更多技术 - 清泛网 - 专注C/C++及内核技术
内网时间同步问题标准的三层网络结构，INT网-----通讯层------应用层-----数据库层现在的问题是数据库层每一个月时间会快上那么一分钟解决方法使用CISCO通讯...标准的三层网络结构，
INT网-----通讯层------应用层-----数据库层 现...
如何在Visual Studio中运行和调试汇编代码 - 其他 - 清泛IT社区，为创新赋能！
使用内联汇编__asm，如下：
int _tmain(int argc, _TCHAR* argv[])
{
int a = 1;
__asm{
xor eax, eax
 ...
What's the absurd function in Data.Void useful for?
...pe is involved in the return type of a function.
absurd arises when we're converting between these two representations.
For example, callcc :: ((a -> m b) -> m a) -> m a uses (implicit) forall b. It could be as well of type ((a -> m Void) -> m a) -> m a, because a call to the c...
error, string or binary data would be truncated when trying to insert
...ne of the INSERT statements you are attempting to insert a too long string into a string (varchar or nvarchar) column.
If it's not obvious which INSERT is the offender by a mere look at the script, you could count the <1 row affected> lines that occur before the error message. The obtained nu...
@synthesize vs @dynamic, what are the differences?
...e'd accessor it must still be backed by a real field (e.g., if you write -(int) getFoo(); you must have an int foo; field). If the value is being produce by something else (e.g. calculated from other fields) then you have to use @dynamic.
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C# Lazy Loaded Automatic Properties
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@AbleArcher Pointing out a new language feature is a pitch now?
– Alexander Derck
Sep 26 '18 at 21:29
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MVC 5 Seed Users and Roles
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I literally copied and pasted this code into my Seed method in a new mvc 5 web application, and then ran "update-database" in the package manager console. It adds the role (I can see it in AspNetRoles table), but when it comes to the line manager.AddToRole(user.Id...
How to install Boost on Ubuntu
...ll-dev
sudo apt install aptitude
aptitude search boost
Then paste this into a C++ file called main.cpp:
#include <iostream>
#include <boost/array.hpp>
using namespace std;
int main(){
boost::array<int, 4> arr = {{1,2,3,4}};
cout << "hi" << arr[0];
return 0;
...