大约有 19,605 项符合查询结果（耗时：0.0434秒） [XML]
Retrieving the last record in each group - MySQL
... both queries and use the one that is better at performance given your database.
For example, I have a copy of the StackOverflow August data dump. I'll use that for benchmarking. There are 1,114,357 rows in the Posts table. This is running on MySQL 5.0.75 on my Macbook Pro 2.40GHz.
I'll write a...
When would I need a SecureString in .NET?
...t wont be easy to find the symmetric encryption key, since SecureString is based on DPAPI, which doesnt exactly store a key in plaintext...
– AviD
Sep 27 '08 at 17:48
1
...
Simple insecure two-way data “obfuscation”?
...eep honest people honest, but something a little stronger than ROT13 or Base64 .
17 Answers
...
Executors.newCachedThreadPool() versus Executors.newFixedThreadPool()
...ume a non-negligible amount of memory and also increase memory consumption based on their work-in-progress, so it's quite easy to topple a server this way (unless you have other circuit-breakers in place).
The unbounded problem is exacerbated by the fact that the Executor is fronted by a Synchronous...
Customizing the template within a Directive
...ch creates the template html, from compile to a template function. Example based on code from above:
angular.module('formComponents', [])
.directive('formInput', function() {
return {
restrict: 'E',
template: function(element, attrs) {
var type = attrs.type || '...
How to sort an array in Bash
...espace (except newlines)
Note readarray is supported in bash 4+.
Edit Based on the suggestion by @Dimitre I had updated it to:
readarray -t sorted < <(printf '%s\0' "${array[@]}" | sort -z | xargs -0n1)
which has the benefit of even understanding sorting elements with newline character...
In MySQL queries, why use join instead of where?
...t for JOIN types other than INNER, making queries easy to use on other databases
WHERE clause only serves as filtration of the cartesian product of the tables joined
From a Design Perspective:
ANSI-92 JOIN syntax is pattern, not anti-pattern:
The purpose of the query is more obvious; the colu...
What's the difference between @JoinColumn and mappedBy when using a JPA @OneToMany association
...whichever generation you think fits your needs. If you're on a legacy database and don't want to change the structure, pick whichever matches your schema.
– Snekse
Mar 7 '17 at 16:36
...
How can you debug a CORS request with cURL?
...
The bash script "corstest" below works for me. It is based on Jun's comment above.
usage
corstest [-v] url
examples
./corstest https://api.coindesk.com/v1/bpi/currentprice.json
https://api.coindesk.com/v1/bpi/currentprice.json Access-Control-Allow-Origin: *
the positiv...
Get real path from URI, Android KitKat new storage access framework [duplicate]
...Documents, as well as the _data field for the MediaStore and
* other file-based ContentProviders.
*
* @param context The context.
* @param uri The Uri to query.
* @author paulburke
*/
public static String getPath(final Context context, final Uri uri) {
final boolean isKitKat = Build.VERSI...