大约有 7,000 项符合查询结果（耗时：0.0100秒） [XML]
Difference between 3NF and BCNF in simple terms (must be able to explain to an 8-year old)
...quivalent to Codd's:
A relation, R, is in 3NF iff for every nontrivial FD (X->A) satisfied
by R at least ONE of the following conditions is true:
(a) X is a superkey for R, or
(b) A is a key attribute for R
BCNF requires (a) but doesn't treat (b) as a special case of its own. In...
How to detect if a script is being sourced
...ocess $$ is $v ($0, $BASH_SOURCE)" ')
process 29301 is sourced (bash, /dev/fd/63)
bash <(echo $'#!/bin/bash
[ "$0" = "$BASH_SOURCE" ] && v=own || v=sourced;
echo "process $$ is $v ($0, $BASH_SOURCE)" ')
process 16229 is own (/dev/fd/63, /dev/fd/63)
I use source in...
Get first and last date of current month with JavaScript or jQuery [duplicate]
...
I fixed it with Datejs
This is alerting the first day:
var fd = Date.today().clearTime().moveToFirstDayOfMonth();
var firstday = fd.toString("MM/dd/yyyy");
alert(firstday);
This is for the last day:
var ld = Date.today().clearTime().moveToLastDayOfMonth();
var lastday = ld.toStrin...
[解决]CTRL: PTY read or GRE write failed - 更多技术 - 清泛网 - 专注C/C++及内核技术
...查看系统日志[cat var log messages |grep pptpd]后发现）GRE: read(fd=6,buffer=80504c0...pptp vpn服务器连接失败出现以下日志内容：
（查看系统日志[ cat /var/log/messages |grep pptpd ]后发现）
GRE: read(fd=6,buffer=80504c0,len=8196) from PTY failed: status = -1 er...
Google breakpad stackwalker无法加载符号 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...head -n1 tmp/c++11.sym
#todo:
mkdir -p ./symbols/c++11/6EDC6ACDB282125843FD59DA9C81BD830
mv tmp/c++11.sym ./symbols/c++11/6EDC6ACDB282125843FD59DA9C81BD830
rm -rf tmp
路径有要求，GUID来自 .so 文件的头部。
为了方便，写个 python 脚本 gen_symbols.py 自动生成：
#...
/proc 内核统计信息各文件的含义 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...的统计文件，如下： ls -F proc 904 attr coredump_filter fdinfo make-it-fail mountstats oom_score_adj sched stat 1、各进程的统计文件，如下：
# ls -F /proc/904/
attr/ coredump_filter fdinfo/ make-it-fail mountstats oom_score_adj sched st...
Disable autocomplete via CSS
...n CSS. However, html has an easy code for this:
<input type="text" id="foo" value="bar" autocomplete="off" />
If you're looking for a site-wide effector, an easy one would be to simply have a js function to run through all 'input' s and add this tag, or look for the corresponding css class ...
What's the best way to check if a file exists in C?
...itions, then use this:
#include <fcntl.h>
#include <errno.h>
fd = open(pathname, O_CREAT | O_WRONLY | O_EXCL, S_IRUSR | S_IWUSR);
if (fd < 0) {
/* failure */
if (errno == EEXIST) {
/* the file already existed */
...
}
} else {
/* now you can use the file */
}
...
UDP vs TCP, how much faster is it? [closed]
...do care about latencies A LOT; it is this simple thing which accounts for 99% of legit uses for UDP. And a few nitpicks: (a) group delivery DOES NOT work over the Internet (and unlikely ever will), so it is the Intranet-only realm; (b) per Google, only 8-9% of Internet population has problems with ...
What are the various “Build action” settings in Visual Studio project properties and what do they do
... variables of your class to the now-created items (e.g. if you put x:Name="foo" on an item, you'll be able to do this.foo.Background = Purple; or similar.
ApplicationDefinition -- similar to Page, except it goes onestep furthur, and defines the entry point for your application that will instantiate...