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If table exists drop table then create it, if it does not exist just create it
...ing next RENAME ... can (and will) be
unsafe if another thread has already started same sequence (it's
better to cover this case than not to cover, see locking note below).
Second RENAME ... atomically replaces table definition, refer to
MySQL manual
for details.
At last, DROP ... just cleans up the...
Blocks and yields in Ruby
...y", "tuesday", "wednesday", "thursday", "friday"]
# select those which start with 't'
days.select do | item |
item.match /^t/
end
=> ["tuesday", "thursday"]
Or, we can also provide a custom sort algorithm, for instance based on the string size:
days.sort do |x,y|
x.size <=...
In Intellij, how do I toggle between camel case and underscore spaced?
...implify the first approach, you could record a macro Edit > Macros > Start recording macro and then add a simple key-mapping for your macro Settings > Keymap > Macros > YourMacro (right-click > Add Keyboard Shortcut)
– DannyMo
Jun 27 '13 at 20...
Django-DB-Migrations: cannot ALTER TABLE because it has pending trigger events
...
Have just hit this problem. You can also use db.start_transaction() and db.commit_transaction() in the schema migration to separate data changes from schema changes. Probably not so clean as to have a separate data migration but in my case I would need schema, data, and th...
Where in memory are my variables stored in C?
...es 4 bytes (if 64 bit machine 8 bytes) which will be in stack to store the starting pointer of the n bytes of memory chunk.
Note : Pointer variables can point the memory of any segment.
int x = 10;
void func()
{
int a = 0;
int *p = &a: //Now its pointing the memory of stack
int *p2 = &x; ...
How to read and write INI file with Python3?
...
This can be something to start with:
import configparser
config = configparser.ConfigParser()
config.read('FILE.INI')
print(config['DEFAULT']['path']) # -> "/path/name/"
config['DEFAULT']['path'] = '/var/shared/' # update
config['DEFAULT'...
Private properties in JavaScript ES6 classes
...e fields (and methods) are being implemented in the ECMA standard. You can start using them today with babel 7 and stage 3 preset.
class Something {
#property;
constructor(){
this.#property = "test";
}
#privateMethod() {
return 'hello world';
}
getPrivateMessage() {
ret...
Custom CSS Scrollbar for Firefox
...
drafts.csswg.org/css-scrollbars-1 is the stage 1 start of the spec, but it's enabled in Firefox Nightly now out of the box by default.
– wegry
Nov 2 '18 at 15:09
...
How do you use the Immediate Window in Visual Studio?
...ust type a > followed by the command.
For example >shell cmd will start a command shell (this can be useful to check what environment variables were passed to Visual Studio, for example). >cls will clear the screen.
Here is a list of commands that are so commonly used that they have the...
What does “Content-type: application/json; charset=utf-8” really mean?
... The assumption still holds though, as any valid json will still start with two ascii characters.
– Larsing
Dec 5 '17 at 13:29
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