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When to use AtomicReference in Java?
... Some examples include the wrapper classes of Long and Double, as well as String, just to name a few. (According to Programming Concurrency on the JVM immutable objects are a critical part of modern concurrency).
Next, why AtomicReference is better than a volatile object for sharing that shared...
How to find largest objects in a SQL Server database?
...est objects in a SQL Server database? First, by determining which tables (and related indices) are the largest and then determining which rows in a particular table are largest (we're storing binary data in BLOBs)?
...
Webstorm: “Cannot Resolve Directory”
...et feature in it's HTML parser that will attempt to resolve directories in strings that are supposed to reference a file in your project. For example:
...
How can I get the ID of an element using jQuery?
Why doesn't the above work, and how should I do this?
19 Answers
19
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Is there an MD5 Fixed Point where md5(x) == x?
...cessarily also have to be 128 bits long. Assuming that the MD5 sum of any string is uniformly distributed over all possible sums, then the probability that any given 128-bit string is a fixed point is 1/2128.
Thus, the probability that no 128-bit string is a fixed point is (1 − 1/2128)2128, so t...
Unit testing void methods?
...actually split it into two methods that can now be independently tested.
string[] ExamineLogFileForX( string sFileName );
void InsertStringsIntoDatabase( string[] );
String[] can be easily verified by providing the first method with a dummy file and expected strings. The second one is slightly t...
Generate full SQL script from EF 5 Code First Migrations
...ow on earth did you discover that 0 works when the parameter is normally a string?!
– Dave R
Mar 10 '14 at 16:33
29
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How to find gaps in sequential numbering in mysql?
...lues were imported from another system. There is an auto-increment column, and there are no duplicate values, but there are missing values. For example, running this query:
...
Array initialization syntax when not in a declaration
...an use the toArray() method on it.
For example:
ArrayList<String> al = new ArrayList<String>();
al.add("one");
al.add("two");
String[] strArray = (String[]) al.toArray(new String[0]);
I hope this might help you.
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How to create an object for a Django model with a many to many field?
...my original suggestion. It works, but isn't optimal. (Note: I'm using Bars and a Foo instead of Users and a Sample, but you get the idea).
bar1 = Bar.objects.get(pk=1)
bar2 = Bar.objects.get(pk=2)
foo = Foo()
foo.save()
foo.bars.add(bar1)
foo.bars.add(bar2)
It generates a whopping total of 7 quer...