大约有 30,000 项符合查询结果（耗时：0.0307秒） [XML]
“INSERT IGNORE” vs “INSERT … ON DUPLICATE KEY UPDATE”
...,029,941 to 46,271,740 between two rows. That generation of a new AI every time means that your range can very quickly be filled and you need to clean up. This table is only two weeks old!
– Engineer81
Jul 10 '14 at 18:21
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Perform an action in every sub-directory using Bash
...esn't print each word in a folder name as a separate entity.
# Option A
$ time for D in ./big_dir/*; do find "$D" -type d > /dev/null; done
real 0m0.327s
user 0m0.084s
sys 0m0.236s
# Option B
$ time for D in `find ./big_dir/* -type d`; do echo "$D" > /dev/null; done
real 0m0.787...
Why does C++11's lambda require “mutable” keyword for capture-by-value, by default?
...because by default, a function object should produce the same result every time it's called. This is the difference between an object orientated function and a function using a global variable, effectively.
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Getting a timestamp for today at midnight?
How would I go about getting a timestamp in php for today at midnight. Say it's monday 5PM and I want the Timestamp for Monday(today) at midnight(12 am) which already has happened.
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What's the difference between an object initializer and a constructor?
...t a variable when using an initializer list, you won't notice it until run-time (and maybe not even immediately). Furthermore: the field can't be readonly, making accidental changes possible, without the compiler complaining
– Harald Coppoolse
Jan 19 '17 at 9:1...
Verifying a specific parameter with Moq
...erify(c => c.Method(It.IsAny<int>(), It.IsAny<MyObject>()), Times.Once());
// Assert about saveObject
Assert.That(saveObject.TheProperty, Is.EqualTo(2));
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When is it practical to use Depth-First Search (DFS) vs Breadth-First Search (BFS)? [closed]
... solutions are rare, depth first search
(DFS) might take an extremely long time, but BFS could be faster.
If the tree is very wide, a BFS might need too much memory, so it
might be completely impractical.
If solutions are frequent but located deep in the tree, BFS could be
impractical.
If the sea...
List Git aliases
...ias called (strangely enough) alias for exactly this purpose... handy from time to time if you use aliasing enough...
$ git config --global alias.alias "config --get-regexp ^alias\."
Note, the regex makes sure the line starts with alias..
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Standard concise way to copy a file in Java?
...VisitDirectory(Path dir, IOException exc) {
// fix up modification time of directory when done
if (exc == null && Arrays.toList(options).contains(COPY_ATTRIBUTES)) {
Path newdir = target.resolve(source.relativize(dir));
try {
FileTime t...
Error 908: Permission Receive SMS - #5 by Taifun - MIT App Inventor Help - MIT App Inventor Community
...sions are included in the manifest and, if Android >= 6.0, requested at runtime.
Prior to this change, ReceivingEnabled was default Foreground, not Off. Therefore, older tutorials may not work since they assume the old behavior. People will need to consciously enable the receiving option to recei...