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How would you do a “not in” query with LINQ?
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Using Except: If you work with complex types lists, then you have to implement an IEqualityComparer<MyComlplexType>, which it makes it not that nice
– sakito
Nov 10 '10 at 16:47
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JPA getSingleResult() or null
...is, I have to findByIdAndForeignKey , if it returned null insert if not then update. The problem is how do I check if it exists? So I tried getSingleResult . But it throws an exception if the
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Assigning default values to shell variables with a single command in bash
... variables in a bash (3.00) shell script where if the variable is not set, then it assigns a default, e.g.:
9 Answers
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How to add external library in IntelliJ IDEA?
...he jar in it. But I don't know if this is what the direction intended... Then "Refresh project so libs show up in the structure". I could find no command to "refresh". How does one refresh a project? Beginners have a difficult time. :-(
– Rafael_Espericueta
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Rake just one migration
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rake db:migrate:redo VERSION=xxxxxxx, but that will run the down and then the up step. You could do this in conjunction with commenting out the down step temporarily.
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Difference between e.target and e.currentTarget
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If it was a child that dispatched the event then yes targets are the children. Normally you will want to use e.currentTarget as this is what you assigned the listener to. But in situations, such as the one Zevan listed above where you want one listener on a container w...
Naming threads and thread-pools of ExecutorService
...xecutorService replaces the thread, it will be named by the ThreadFactory. Then again, seeing the name disappear while debugging could be a useful indicator.
– sethro
Feb 18 '14 at 19:19
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How to convert a String into an ArrayList?
... in your code and you have to convert it into arraylist (offcourse string) then use of collections is better. like this:
String array1[] = getIntent().getExtras().getStringArray("key1"); or String array1[] = ... then
List allEds = new ArrayList(); Collections.addAll(allEds, array1);
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Get an object's class name at runtime
...uctor.name or (this as object).constructor.name is better than any because then you actually get autocomplete :-)
– Simon_Weaver
Jan 16 '19 at 22:31
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Virtual/pure virtual explained
...act classes
These are base classes where you have to derive from them and then implement the pure virtual functions.
b) interfaces
These are 'empty' classes where all functions are pure virtual and hence you have to derive and then implement all of the functions.
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