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PostgreSQL query to return results as a comma separated list
...
SELECT string_agg(id::text, ',') FROM table
Requires PostgreSQL 9.0 but that's not a problem.
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Java generics T vs Object
...on error when I do wrong:
public class App {
public static void main(String[] args) {
String s = process("vv");
String b = process(new Object()); // Compilation error
}
public static <T> T process(T val) {
return val;
}
}
Using object I always nee...
How do I run a simple bit of code in a new thread?
...ject o, ProgressChangedEventArgs args)
{
label1.Text = string.Format("{0}% Completed", args.ProgressPercentage);
});
// what to do when worker completes its task (notify the user)
bw.RunWorkerCompleted += new RunWorkerCompletedEventHandler(
delega...
Calculate the execution time of a method
....Diagnostics;
using System.Threading;
class Program
{
static void Main(string[] args)
{
Stopwatch stopWatch = new Stopwatch();
stopWatch.Start();
Thread.Sleep(10000);
stopWatch.Stop();
// Get the elapsed time as a TimeSpan value.
TimeSpan ts = ...
What is Dependency Injection and Inversion of Control in Spring Framework?
...Consider a class Employee
class Employee {
private int id;
private String name;
private Address address;
Employee() {
id = 10;
name="name";
address = new Address();
}
}
and consider class Address
class Address {
private String street;
private String city;
...
Boolean literals in PowerShell
...ional statements. Most non-null objects are true, for example. null, empty strings, empty arrays and the number 0 are false.
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Android read text raw resource file
...redReader reader = new BufferedReader(new InputStreamReader(inputStream));
String line = reader.readLine();
while (line != null) { ... }
Don't forget that readLine() skips the new-lines!
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C# DropDownList with a Dictionary as DataSource
...eField of DropDownList using "Key" and "Value" texts :
Dictionary<string, string> list = new Dictionary<string, string>();
list.Add("item 1", "Item 1");
list.Add("item 2", "Item 2");
list.Add("item 3", "Item 3");
list.Add("item 4", "Item 4");
ddl.DataSource = l...
Resource interpreted as Document but transferred with MIME type application/zip
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@all It's 2035 (I've come from future) and there is no computer to support this.
– Ali Farhoudi
Apr 17 '19 at 9:01
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Parse XML using JavaScript [duplicate]
...XML found through using GeoNames' FindNearestAddress.
If your XML is in a string variable called txt and looks like this:
<address>
<street>Roble Ave</street>
<mtfcc>S1400</mtfcc>
<streetNumber>649</streetNumber>
<lat>37.45127</lat>
&...