大约有 6,887 项符合查询结果（耗时：0.0201秒） [XML]
What is a segmentation fault?
...d after the memory they point to has been realloced or deleted.
Used in an indexed array where the index is outside of the array bounds. This is generally only when you're doing pointer math on traditional arrays or c-strings, not STL / Boost based collections (in C++.)
...
Why does the order of the loops affect performance when iterating over a 2D array?
..."second" versions around the wrong way; the first example varies the first index in the inner loop, and will be the slower executing example.
– caf
Mar 30 '12 at 5:39
1
...
INSERT … ON DUPLICATE KEY (do nothing)
...nge if there is entry matches unique key or primary key but auto-increment index will increase by 1
some other errors/warnings will be ignored such as data conversion error.
3. INSERT ... ON DUPLICATE KEY UPDATE
pros:
you can easily implement 'save or update' function with this
cons:
loo...
How to pick an image from gallery (SD Card) for my app?
...ull, null, null);
cursor.moveToFirst();
int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
String filePath = cursor.getString(columnIndex);
cursor.close();
Bitmap yourSelectedImage = BitmapFactory.decodeFile(filePath);
}...
Reset/remove CSS styles for element only
...normal;
widows : 0;
width : auto;
word-spacing : normal;
z-index : auto;
/* basic modern patch */
all: initial;
all: unset;
}
/* basic modern patch */
#reset-this-root {
all: initial;
* {
all: unset;
}
}
Relevent github repo with a december 2017 m...
Dynamically creating keys in a JavaScript associative array
...tion. You won't be able to refer to the array values in a for loop with an index (such as myarray[i]). Hope that's not too confusing.
– MK_Dev
Dec 9 '08 at 2:15
4
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What are Long-Polling, Websockets, Server-Sent Events (SSE) and Comet?
...n also cross-check it's difference with Websocket?
– index
Nov 7 '12 at 7:34
1
@Tieme Oh was that...
Skip Git commit hooks
...tster -- in commit c3e034f, 23 Aug 2017)
commit: skip discarding the index if there is no pre-commit hook
"git commit" used to discard the index and re-read from the filesystem
just in case the pre-commit hook has updated it in the middle; this
has been optimized out when we know we d...
How do I execute a stored procedure once for each row returned by query?
...
Make sure you check your indexes on the JOINS and WHERE clauses in the fields used in your stored procedure. I dramatically sped up calling my SP in a loop after adding appropriate indexes.
– Matthew
Feb 16 '18 ...
How do you do a limit query in JPQL or HQL?
...Cool, right?
Beyond SQL-based pagination
Pagination is good when you can index the filtering and sorting criteria. If your pagination requirements imply dynamic filtering, it's a much better approach to use an inverted-index solution, like ElasticSearch.
Check out this article for more details.
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