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Best practices for in-app database migration for Sqlite
...
I maintain an application that periodically needs to update a sqlite database and migrate old databases to the new schema and here's what I do:
For tracking the database version, I use the built in user-version variable that sql...
How to detect the swipe left or Right in Android?
...ctivity 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 handle code when app is killed by swiping in android?
...be fired only if stopWithTask is set to false).
public void onTaskRemoved(Intent rootIntent) {
//unregister listeners
//do any other cleanup if required
//stop service
stopSelf();
}
Refer my question for more details, which contains other part of code, too.
Hope this helps.
...
405 method not allowed Web API
...]
[ResponseType(typeof(Scan))]
public IHttpActionResult DeleteScan(int id)
{
Scan scan = db.Scans.Find(id);
if (scan == null)
{
return NotFound();
}
db.Scans.Remove(scan);
db.SaveChanges();
return Ok(scan);
}
...
PostgreSQL delete all content
...s an example there are three tables:
create table customers (
customer_id int not null,
name varchar(20),
surname varchar(30),
constraint pk_customer primary key (customer_id)
);
create table orders (
order_id int not null,
number int not null,
customer_id int not null,
constraint pk_order primary...
What is unit testing and how do you do it? [duplicate]
...
Unit testing involves breaking your program into pieces, and subjecting each piece to a series of tests.
Usually tests are run as separate programs, but the method of testing varies, depending on the language, and type of software (GUI, command-line, library).
Most ...
How do I get SUM function in MySQL to return '0' if no values are found?
...ture):
SQL Fiddle
MySQL 5.5.32 Schema Setup:
CREATE TABLE foo
(
id INT NOT NULL AUTO_INCREMENT PRIMARY KEY,
val INT
);
INSERT INTO foo (val) VALUES
(null),(1),(null),(2),(null),(3),(null),(4),(null),(5),(null),(6),(null);
CREATE TABLE bar
(
id INT NOT NULL AUTO_INCREMENT PRIMARY K...
How do you access command line arguments in Swift?
...n CommandLine.arguments {
switch argument {
case "arg1":
print("first argument")
case "arg2":
print("second argument")
default:
print("an argument")
}
}
share
|
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How to test equality of Swift enums with associated values
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Swift 4.1+
As @jedwidz has helpfully pointed out, from Swift 4.1 (due to SE-0185, Swift also supports synthesizing Equatable and Hashable for enums with associated values.
So if you're on Swift 4.1 or newer, the following will automatically synthesize the necessa...
C/C++ Struct vs Class
...o fake some OOP in C—for instance, defining functions which all take a pointer to a struct as their first parameter, or occasionally coercing structs with the same first few fields to be "sub/superclasses"—it's always sort of bolted on, and isn't really part of the language.
...