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国内最美旅游景点TOP10 总有一处让你心动 - 杂谈 - 清泛网 - 专注C/C++及内核技术
...症,且还都无药可医。各位爱旅行的小伙伴们,小编为你搜索了国内最美风景的10个胜地,秒...长假已经走了,听说大伙居然都患上了不同程度的“节后症”,且还都无药可医。各位爱旅行的小伙伴们,小编为你搜索了国内最美...
Generate random string/characters in JavaScript
...ters of hex.
Option 2
If you have to do this client-side, perhaps try the uuid module -
var uuid = require("uuid");
var id = uuid.v4();
// "110ec58a-a0f2-4ac4-8393-c866d813b8d1"
Option 3
If you have to do this client-side and you don't have to support old browsers, you can do it without dependen...
Generating a random & unique 8 character string using MySQL
...ting an 8-character long pseudo-random string in pure (My)SQL:
SELECT LEFT(UUID(), 8);
You can try the following (pseudo-code):
DO
SELECT LEFT(UUID(), 8) INTO @plate;
INSERT INTO plates (@plate);
WHILE there_is_a_unique_constraint_violation
-- @plate is your newly assigned plate number
S...
top命令使用详解 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...q] [c] [C] [S] [s] [i] [n iter] [b]
p 仅监视进程给定的进程ID
d 指定每两次屏幕信息刷新之间的时间间隔。当然用户可以使用s交互命令来改变之。
q 该选项将使top没有任何延迟的进行刷新。如果调用程序有超级用户权限,那么top将以...
NSIS做的安装程序,可接受命令行参数,实现静默安装,静默卸载 - 更多技术 ...
...令行参数,实现静默安装,静默卸载命令参数 D=xxx 可以指定安装包的安装路径,覆盖安装包中设置的默认路径及注册表中默认路径。但是, D= 后面一定不能有引号(不能写成...命令参数 /D=xxx 可以指定安装包的安装路径,覆盖...
记一次MongoDB性能问题 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...其它操作,从而导致雪崩效应。
为了验证这种可能,我搜索了一下MongoDB日志:
shell> grep FileAllocator /path/to/log
[FileAllocator] allocating new datafile ... filling with zeroes...
[FileAllocator] done allocating datafile ... took ... secs
我使用的文件系...
How to suppress GCC warnings from library headers?
...gma GCC diagnostic ignored "-Wunused-but-set-variable"
#include <boost/uuid/uuid.hpp>
#include <boost/uuid/uuid_generators.hpp>
#include <boost/uuid/uuid_io.hpp>
#include <boost/lexical_cast.hpp>
// turn the warnings back on
#pragma GCC diagnostic pop
...
Apache两种工作模式区别及配置切换 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...,当时httpd工作在prefork模式下。
在configure时,可以通过指定参数,将工作模式设置为worker模式或prefork模式。
使用命令:./configure –with-mpm=worker
示例:设置为worker模式
Apache服务的两种工作模式详解:
http://www.cnblogs.co...
Convert varchar to uniqueidentifier in SQL Server
...
DECLARE @uuid VARCHAR(50)
SET @uuid = 'a89b1acd95016ae6b9c8aabb07da2010'
SELECT CAST(
SUBSTRING(@uuid, 1, 8) + '-' + SUBSTRING(@uuid, 9, 4) + '-' + SUBSTRING(@uuid, 13, 4) + '-' +
SUBSTRING(@uuid, 17, 4) + '-' + SUBST...
Android get free size of internal/external memory
....execute {
for (storageVolume in storageVolumes) {
val uuid: UUID = storageVolume.uuid?.let { UUID.fromString(it) } ?: StorageManager.UUID_DEFAULT
val allocatableBytes = storageManager.getAllocatableBytes(uuid)
Log.d("AppLog", "allocatableBytes:${android.t...
