大约有 20,000 项符合查询结果（耗时：0.0495秒） [XML]
What is the difference between “def” and “val” to define a function
...if you need a function (not method) for function composition or for higher order functions (like filter(even)) compiler will generate a function from your method every time you are using it as function, so performance could be slightly worse than with val.
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What's the difference between comma separated joins and join on syntax in MySQL? [duplicate]
...same query. If we do mix them, we need to be aware of a difference in the order of precedence.
excerpt from MySQL Reference Manual
https://dev.mysql.com/doc/refman/5.6/en/join.html
INNER JOIN and , (comma) are semantically equivalent in the absence of a join condition: both produce a Cartesian pro...
How do I install Python OpenCV through Conda?
...I ran conda update --all and some libraries required a downgrade to 1.9 in order to run.
– mercergeoinfo
Nov 12 '15 at 9:23
2
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Shell Script — Get all files modified after
I'd rather not do this in PHP so I'm hoping a someone decent at shell scripting can help.
9 Answers
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Using PowerShell to write a file in UTF-8 without the BOM
...losed before sending the result through the pipeline. This is necessary in order to be able to write back to the same file (update it in place).
Generally, though, this technique is not advisable for 2 reasons: (a) the whole file must fit into memory and (b) if the command is interrupted, data will ...
Javascript add leading zeroes to date
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You can define a "str_pad" function (as in php):
function str_pad(n) {
return String("00" + n).slice(-2);
}
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How do I kill all the processes in Mysql “show processlist”?
...ny massive kill command. You can script it in any language, for example in PHP you can use something like:
$result = mysql_query("SHOW FULL PROCESSLIST");
while ($row=mysql_fetch_array($result)) {
$process_id=$row["Id"];
if ($row["Time"] > 200 ) {
$sql="KILL $process_id";
mysql_query...
Best way to build a Plugin system with Java
... * using the attachment found at bugs.freenetproject.org/print_bug_page.php?bug_id=1900
– ataulm
Nov 28 '12 at 22:07
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How do I modify the URL without reloading the page?
...entries, respectively.
window.history.pushState('page2', 'Title', '/page2.php');
Read more about this from here
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How do we control web page caching, across all browsers?
...he request, so you don't need to specify it at all.
How to set it?
Using PHP:
header("Cache-Control: no-cache, no-store, must-revalidate"); // HTTP 1.1.
header("Pragma: no-cache"); // HTTP 1.0.
header("Expires: 0"); // Proxies.
Using Java Servlet, or Node.js:
response.setHeader("Cache-Control"...