大约有 19,000 项符合查询结果（耗时：0.0245秒） [XML]
PHP: How to remove all non printable characters in a string?
...r all of the cases. My issue was in trying to insert a string into a utf8 mysql table. The string (and its bytes) all conformed to utf8, but had several bad sequences. I assume that most of them were control or formatting.
function clean_string($string) {
$s = trim($string);
$s = iconv("UTF-...
LEFT JOIN only first row
...t's heavier for getting the data as it created a temporary table... I wish MySql could have a LIMIT on the LEFT JOIN level.
– Shadoweb
Feb 20 '17 at 11:25
...
手握利器，直面“蓝脸”! ——使用WinDbg抗击系统崩溃 - 操作系统(内核) - ...
...拥有符号信息，这样才能正确分析出问题根源。那我们该如何设置调试符号文件的位置呢？我们既可以从微软官网下载完整的符号文件包(同位于WinDbg下载页面)，也可以使用微软的符号文件服务器(Microsoft Symbol Server)。笔者推荐后...
Using querySelectorAll to retrieve direct children
... At the time it was asked, a universally-implemented way to do "combinator rooted queries" (as John Resig called them) did not exist.
Now the :scope pseudo-class has been introduced. It is not supported on [pre-Chrominum] versions of Edge or IE, but has been supported by Safari for a few years alre...
TokuMX vs. MongoDB 性能对比 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...占用也比MongoDB少10%左右）。这种思路不稀奇，5.x版本的MySQL，如果设定file_format为Barracuda，也可以直接对表做压缩，同时不影响外部操作；提高写入速度则值得一提，原来TokuMX的做法是使用 分形树索引（Fractal Tree Index） ，替代...
WiX tricks and tips
...INSTALLLOCATION">
<RegistrySearch Id="RegistrySearch" Type="raw" Root="HKLM" Win64="$(var.Win64)"
Key="Software\Company\Product" Name="InstallLocation" />
</Property>
Note: WiX guru Rob Mensching has posted an excellent blog entry which goes into more detail and f...
INNER JOIN ON vs WHERE clause
....
It's easier to see this with the WHERE syntax.
As for your example, in MySQL (and in SQL generally) these two queries are synonyms.
Also note that MySQL also has a STRAIGHT_JOIN clause.
Using this clause, you can control the JOIN order: which table is scanned in the outer loop and which one is...
Cron and virtualenv
... SHELL environment variable to be /bin/bash:
SHELL=/bin/bash
*/10 * * * * root source /path/to/virtualenv/bin/activate && /path/to/build/manage.py some_command > /dev/null
It's tricky to spot why this fails as /var/log/syslog doesn't log the error details. Best to alias yourself to ro...
Run a string as a command within a Bash script
...g minus two parameters so I ended up with something like:
my_exe ()
{
mysql -sN -e "select $1 from heat.stack where heat.stack.name=\"$2\";"
}
This is something I use to monitor openstack heat stack creation. In this case I expect two conditions, an action 'CREATE' and a status 'COMPLETE' on ...
Is there a way to change the environment variables of another process in Unix?
...
Substantially, no. If you had sufficient privileges (root, or thereabouts) and poked around /dev/kmem (kernel memory), and you made changes to the process's environment, and if the process actually re-referenced the environment variable afterwards (that is, the process had not ...