大约有 40,000 项符合查询结果（耗时：0.0430秒） [XML]
file_put_contents - failed to open stream: Permission denied
...o manually write queries to a file like this. MySQL has logging support built in, you just need to enable it within your dev environment.
Take a look at the documentation for the 'general query log':
http://dev.mysql.com/doc/refman/5.1/en/query-log.html
...
How can I test what my readme.md file will look like before committing to github?
...
dillinger.io also seems to be down now, although it is still the first listed when you google "markdown online viewer", so it might just be me. I successfully used stackedit.io to preview and edit my readme.md.
– Aaron
Jan 10 '...
Count occurrences of a char in a string using Bash
...nd:
string="text,text,text,text"
char=","
awk -F"${char}" '{print NF-1}' <<< "${string}"
I'm splitting the string by $char and print the number of resulting fields minus 1.
If your shell does not support the <<< operator, use echo:
echo "${string}" | awk -F"${char}" '{print NF...
FixedThreadPool vs CachedThreadPool: the lesser of two evils
...tter suited for longer lived tasks and with my very limited knowledge of multithreading, I considered the average life of the threads (several minutes) " long lived ".
...
Create unique constraint with null columns
...wide - use the PK column instead).
If you need a complete index, you can alternatively drop the WHERE condition from favo_3col_uni_idx and your requirements are still enforced.
The index, now comprising the whole table, overlaps with the other one and gets bigger. Depending on typical queries and t...
Edit a commit message in SourceTree Windows (already pushed to remote)
...From the terminal force-push with the following command,
git push origin <branch> -f
where <branch> is the name of the branch that you want to push, and -f means
to force the push. The force push will overwrite your commits on your
remote repo, but that's OK in your case since you sai...
Clear file cache to repeat performance testing
...ues can I use to remove cached file contents to prevent my performance results from being skewed? I believe I need to either completely clear, or selectively remove cached information about file and directory contents.
...
How do I access properties of a javascript object if I don't know the names?
...
Old versions of JavaScript (< ES5) require using a for..in loop:
for (var key in data) {
if (data.hasOwnProperty(key)) {
// do something with key
}
}
ES5 introduces Object.keys and Array#forEach which makes this a little easier:
var data =...
iPhone - Grand Central Dispatch main thread
...pany.myqueue", 0);
dispatch_async(backgroundQueue, ^{
int result = <some really long calculation that takes seconds to complete>;
dispatch_async(dispatch_get_main_queue(), ^{
[self updateMyUIWithResult:result];
});
});
}
In this case, we are ...
Does Haskell require a garbage collector?
...
loop :: Maybe [Int] -> IO ()
loop obj = do
print obj
resp <- getLine
if resp == "clear"
then loop Nothing
else loop obj
In this program, the list [1..1000] must be kept in memory until the user types "clear"; so the lifetime of this must be determined dynamically, ...