default-value
insert DEFAULT values
It’s exactly the same thing. No need to pick one instead of the other. Usually default keyword is handy when you have computer-generated code. It makes life easier to just use every single column in the insert clause and just use default when you don’t have a specific value for certain column. Other than that, … Read more
Default selection for within
<h:selectOneMenu id=”items” value=”#{bean.selectedItem}”> <f:selectItem itemLabel=”10″ itemValue=”10″/> <f:selectItem itemLabel=”20″ itemValue=”20″/> <f:selectItem itemLabel=”30″ itemValue=”30″/> </h:selectOneMenu> The default selection would be the one which has value same as selectedItem which you set in bean. selectedItem = 20;
Is un-initialized integer always default to 0 in c?
External and static variables are initialized to zero by default, this is guaranteed. Automatic and register variables that do not have en explicit initializer will have an indeterminate value (either an unspecified value or a trap representation). From The Standard: C89 6.5.7: If an object that has static storage duration is not initialized explicitly, it … Read more
Is it possible to declare default argument in Java in String? [duplicate]
No, the way you would normally do this is overload the method like so: public void test() { test(“exampleText”); } public void test(String name) { }
Alter column default value
I think issue here is with the confusion between Create Table and Alter Table commands. If we look at Create table then we can add a default value and default constraint at same time as: <column_definition> ::= column_name <data_type> [ FILESTREAM ] [ COLLATE collation_name ] [ SPARSE ] [ NULL | NOT NULL ] … Read more
What is the scope of a defaulted parameter in Python? [duplicate]
The scope is as you would expect. The perhaps surprising thing is that the default value is only calculated once and reused, so each time you call the function you get the same list, not a new list initialized to []. The list is stored in f.__defaults__ (or f.func_defaults in Python 2.) def f(a, L=[]): … Read more
std::map default value for build-in type
This is defined in the standard, yes. map is performing “default initialization” in this case. As you say, for class types, that calls a no-arguments constructor. For built-in types, in the ’98 standard, see section 8.5, “Initializers”: To default-initialize an object of type T means: if T is a non-POD … if T is an … Read more
How can I avoid std::vector to initialize all its elements?
The initialization of the elements allocated is controlled by the Allocator template argument, if you need it customized, customize it. But remember that this can get easily wind-up in the realm of dirty hacking, so use with caution. For instance, here is a pretty dirty solution. It will avoid the initialization, but it most probably … Read more