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Reorder / reset auto increment primary key
...ySQL table with an auto increment primary key. I deleted some rows in the middle of the table. Now I have, for example, something like this in the ID column: 12, 13, 14, 19, 20. I deleted the 15, 16, 17 and 18 rows.
...
How do I perform a Perl substitution on a string while keeping the original?
...ed to get a modified copy of a string without changing the original:
(my $newstring = $oldstring) =~ s/foo/bar/g;
In perl 5.14.0 or later, you can use the new /r non-destructive substitution modifier:
my $newstring = $oldstring =~ s/foo/bar/gr;
Note: The above solutions work without g too. ...
App Inventor iOS App编译全流程：7步搞定苹果签名上架（更新版） - App应...
...问题可参考这篇帖子。
第3步：创建应用标识符（App ID）
在开发者门户点击"标识符"→ 点"+"→ 选"App ID"→ 选"App"。
关键参数：
- 描述：用应用名称即可
- 应用ID前缀：选带"(Team ID)"...
How can I initialize an ArrayList with all zeroes in Java?
....
To initialize an list with 60 zeros you do:
List<Integer> list = new ArrayList<Integer>(Collections.nCopies(60, 0));
If you want to create a list with 60 different objects, you could use the Stream API with a Supplier as follows:
List<Person> persons = Stream.generate(Pers...
What does O(log n) mean exactly?
... name on each page and then putting that page in the appropriate spot in a new, empty phone book.
For the below examples, we're now at the printer's office. Phone books are waiting to be mailed to each resident or business, and there's a sticker on each phone book identifying where it should be ma...
Linux - Install redis-cli only
...cli info
– yihuang
Jul 28 '19 at 10:51
now it isn't working http://security.ubuntu.com/ubuntu bionic-updates/universe ...
JavaScript Date Object Comparison
...rning number of milliseconds from epoch (i.e. a number):
var startDate1 = new Date("02/10/2012");
var startDate2 = new Date("01/10/2012");
var startDate3 = new Date("01/10/2012");
alert(startDate1.getTime() > startDate2.getTime()); // true
alert(startDate2.getTime() == startDate3.getTime()); //t...
Convert a RGB Color Value to a Hexadecimal String
...
Random ra = new Random();
int r, g, b;
r=ra.nextInt(255);
g=ra.nextInt(255);
b=ra.nextInt(255);
Color color = new Color(r,g,b);
String hex = Integer.toHexString(color.getRGB() & 0xffffff);
if (hex.length() < 6) {
hex = "0" + h...
Python Nose Import Error
...d_curses
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how to convert an RGB image to numpy array?
...
awiebe
2,35222 gold badges1515 silver badges2525 bronze badges
answered Oct 15 '11 at 8:02
Andrey KamaevAndrey Kamaev
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