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Can a foreign key be NULL and/or duplicate?
... I think there is a better way to solve this problem. Rather than creating new columns, you can have two columns, namely "id" and "type", which will contain the id and name of the foreign key table. Eg, id=1, type=Picture will represent link to Picture table with id 1. Advantage of using this soluti...
Redeploy alternatives to JRebel [closed]
JRebel allows for newly compiled code to be redeployed without restarting the application. I am wondering if there are any alternative (free?). The FAQ page answers this question, but I am sure it's biased towards JRebel. This question was asked a year ago on this site, but I am bringing it ba...
How do I convert Long to byte[] and back in java
...ly faster.
public static byte[] longToBytes(long l) {
byte[] result = new byte[8];
for (int i = 7; i >= 0; i--) {
result[i] = (byte)(l & 0xFF);
l >>= 8;
}
return result;
}
public static long bytesToLong(final byte[] bytes, final int offset) {
long r...
From inside of a Docker container, how do I connect to the localhost of the machine?
... the IP address 172.17.42.1 on the docker0 network interface.
Now start a new container and get a shell on it: docker run --rm -it ubuntu:trusty bash and within the container type ip addr show eth0 to discover how its main network interface is set up:
root@e77f6a1b3740:/# ip addr show eth0
863: et...
Difference between getContext() , getApplicationContext() , getBaseContext() and “this”
...hat is created around an existing Context using:
ContextWrapper wrapper = new ContextWrapper(context);
The benefit of using a ContextWrapper is that it lets you “modify behavior without changing the original Context”. For example, if you have an activity called myActivity then can create a Vi...
Check if a value is in an array (C#)
...rinter).Contains("Jupiter") which is more type-safe. The Linq approach was new in .NET 3.5.
– Jeppe Stig Nielsen
Nov 8 '16 at 13:01
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show 1...
LINQ Select Distinct with Anonymous Types
...t; equals, Func<T,int> hashCode)
{
return items.Distinct(new DelegateComparer<T>(equals, hashCode));
}
public static IEnumerable<T> Distinct<T>(this IEnumerable<T> items,
Func<T, T, bool> equals)
{
return items.Distinct(...
Using IQueryable with Linq
...tomer>. But we don't use that much directly; consider:
using(var ctx = new MyDataContext()) {
var qry = from cust in ctx.Customers
where cust.Region == "North"
select new { cust.Id, cust.Name };
foreach(var row in qry) {
Console.WriteLine("{0}: {1}", r...
Open directory dialog
...mind that it's in the System.Windows.Forms namespace.
using (var dialog = new System.Windows.Forms.FolderBrowserDialog())
{
System.Windows.Forms.DialogResult result = dialog.ShowDialog();
}
If you want the window to be modal over some WPF window, see the question How to use a FolderBrowserDia...
Cross-browser window resize event - JavaScript / jQuery
...s not correct (except for one specific case when you are constructing with new).
– Yoh Suzuki
Mar 13 '13 at 21:00
3
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