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How does JPA orphanRemoval=true differ from the ON DELETE CASCADE DML clause
... does not have the same effect. ON DELETE CASCADE tells the DB to delete all child records when the parent is deleted. That is if I delete the INVOICE, then delete all of the ITEMS on that INVOICE. OrphanRemoval tells the ORM that if I remove an Item object from the collection of Items that bel...
Selecting data from two different servers in SQL Server
...ddlinkedserver.
You only have to set up one. Once you have that, you can call a table on the other server like so:
select
*
from
LocalTable,
[OtherServerName].[OtherDB].[dbo].[OtherTable]
Note that the owner isn't always dbo, so make sure to replace it with whatever schema you use.
...
How to enable CORS in AngularJs
... POSTMAN, but when I try to GET from https://www.google.com using an AJAX call I get the CORS error? Is there no way I can make the AJAX call behave similarly to the call from POSTMAN?
– AjaxLeung
Jan 27 '16 at 17:14
...
Optional Methods in Java Interface
...lections are an exception" suggests a very fuzzy understanding of what's really going on here.
It's important to realize that there are sort of two levels of conforming to an interface:
What the Java language can check. This pretty much just boils down to: is there some implementation for each of...
Breaking/exit nested for in vb.net
... goto solely for a forward jump out of structured control statements is usually considered to be OK, especially if the alternative is to have more complicated code.
For Each item In itemList
For Each item1 In itemList1
If item1.Text = "bla bla bla" Then
Goto end_of_for
...
How to auto-remove trailing whitespace in Eclipse?
...to Code organizing tab -> check Remove trailing whitespace -> select All lines.
Removing whitespace only from the lines I changed:
Preferences -> Java -> Editor -> Save Actions -> check "Perform the selected actions on save -> check Format source code -> select Format edi...
Compare two MySQL databases [closed]
...
If you're working with small databases I've found running mysqldump on both databases with the --skip-comments and --skip-extended-insert options to generate SQL scripts, then running diff on the SQL scripts works pretty well.
By skipping comments y...
How do lexical closures work?
...
Python is actually behaving as defined. Three separate functions are created, but they each have the closure of the environment they're defined in - in this case, the global environment (or the outer function's environment if the loop is ...
Pass a data.frame column name to a function
...l_name,col1,col2){
df$col_name <- df$col1 + df$col2
df
}
#Call foo() like this:
foo(dat,z,x,y)
The problem here is that df$col1 doesn't evaluate the expression col1. It simply looks for a column in df literally called col1. This behavior is described in ?Extract under the secti...
How do I change the language of moment.js?
...locale('es')
console.log(march.format('MMMM')) // 'Marzo'
In summation, calling locale on the global moment sets the locale for all future moment instances, but does not return an instance of moment. Calling locale on an instance, sets it for that instance AND returns that instance.
Also, as Shiv...