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JPA - Returning an auto generated id after persist()
... @Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
private int id;
}
check that @GeneratedValue notation is there in your entity class.This tells JPA about your entity property auto-generated behavior
sh...
Differences between unique_ptr and shared_ptr [duplicate]
...ated with make_shared. But if you create a unique_ptr<Derived>, then convert it to unique_ptr<Base>, and if Derived is virtual and Base is not, then the pointer will be deleted through the wrong type and there can be undefined behaviour. This can be fixed with an appropriate deleter-type...
Concatenate a vector of strings/character
..._num_str_named$e4 <- 'this is added'
Here is the a function that will convert named or unnamed list to string:
ffi_lst2str <- function(ls_list, st_desc, bl_print=TRUE) {
# string desc
if(missing(st_desc)){
st_desc <- deparse(substitute(ls_list))
}
# create string
st_strin...
CSS styling in Django forms
...
one issue with this method is that this filter converts the BoundField into SafeString, so other (similar) filters cannot be chained. django-widget-tweaks returns fields so it's a more robust solution.
– minusf
Sep 24 at 9:09
...
What does `m_` variable prefix mean?
...s also great if you already know the scope and you're using something like intelliSense, you can start with m_ and a list of all your member variables are shown. Part of Hungarian notation, see the part about scope in the examples here.
...
Java inner class and static nested class
...
From the Java Tutorial:
Nested classes are divided into two categories: static and non-static. Nested classes that are declared static are simply called static nested classes. Non-static nested classes are called inner classes.
Static nested classes are accessed using the ...
Entity Framework Migrations renaming tables and columns
...nameColumn generates a sp_rename T-SQL statement which uses uses parsename internally which has some limitations. So if you have a table name which has dots in it e.g. "SubSystemA.Tablename" then use: RenameColumn("dbo.[SubSystemA.Tablename]", "OldColumnName", "NewColumnName");
...
Interface naming in Java [closed]
....
later on you decide, well, there is a need for an interface here, so you convert your class to an interface.
then it becomes obvious: your original class was called User. your interface is now called User. maybe you have a UserProdImpl and a UserTestImpl. if you designed your application well, ev...
Best way to check if object exists in Entity Framework?
...k if object is null , it works 100% for me
try
{
var ID = Convert.ToInt32(Request.Params["ID"]);
var Cert = (from cert in db.TblCompCertUploads where cert.CertID == ID select cert).FirstOrDefault();
if (Cert != null)
{
db.TblCompCertUploads.Delete...
Getting current device language in iOS?
... the 639-1 column):
List of ISO 639-1 codes
Then it's a simple matter of converting the two letter codes to the string you would like to display. So if it's "en", display "English".
Hope this helps someone that's looking to differentiate between region and currently selected language.
EDIT
Wort...