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What are the options for storing hierarchical data in a relational database? [closed]
...st.
+-------------+----------------------+--------+-----+-----+
| category_id | name | parent | lft | rgt |
+-------------+----------------------+--------+-----+-----+
| 1 | ELECTRONICS | NULL | 1 | 20 |
| 2 | TELEVISIONS | 1 | 2 | ...
Types in Objective-C on iOS
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This is a good overview:
http://reference.jumpingmonkey.org/programming_languages/objective-c/types.html
or run this code:
32 bit process:
NSLog(@"Primitive sizes:");
NSLog(@"The size of a char is: %d.", sizeof(char));
NSLog(@"The size of short is: %d.", sizeof(short));
NSLog(@"The si...
How to detect the swipe left or Right in Android?
... class add following attributes:
private float x1,x2;
static final int MIN_DISTANCE = 150;
and override onTouchEvent() method:
@Override
public boolean onTouchEvent(MotionEvent event)
{
switch(event.getAction())
{
case MotionEvent.ACTION_DOWN:
x1 = event.getX(); ...
How to deal with persistent storage (e.g. databases) in Docker
...te --name hello
docker run -d -v hello:/container/path/for/volume container_image my_command
This means that the data-only container pattern must be abandoned in favour of the new volumes.
Actually the volume API is only a better way to achieve what was the data-container pattern.
If you create ...
How to create a temporary directory?
.../bin/bash
# the directory of the script
DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
# the temp directory used, within $DIR
# omit the -p parameter to create a temporal directory in the default location
WORK_DIR=`mktemp -d -p "$DIR"`
# check if tmp dir was created
if [[ ! "...
How to exit pdb and allow program to continue?
...) clear 1
Deleted breakpoint 1
(Pdb) continue
Or, if you're using pdb.set_trace(), you can try this (although if you're using pdb in more fancy ways, this may break things...)
(Pdb) pdb.set_trace = lambda: None # This replaces the set_trace() function!
(Pdb) continue
# No more breaks!
...
dynamic_cast and static_cast in C++
I am quite confused with the dynamic_cast keyword in C++.
10 Answers
10
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JavaScript regex multiline flag doesn't work
...
Can I use: caniuse.com/#feat=mdn-javascript_builtins_regexp_dotall MDN: developer.mozilla.org/ru/docs/Web/JavaScript/Reference/…
– Filyus
Aug 19 at 9:44
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SQL Server - transactions roll back on error?
...
You can put set xact_abort on before your transaction to make sure sql rolls back automatically in case of error.
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...
Aliases in Windows command prompt
...e a .bat or .cmd file with your DOSKEY commands.
Run regedit and go to HKEY_CURRENT_USER\Software\Microsoft\Command Processor
Add String Value entry with the name AutoRun and the full path of your .bat/.cmd file.
For example, %USERPROFILE%\alias.cmd, replacing the initial segment of the path with ...