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背包：将代码块复制并粘贴到不同的屏幕和项目 · App Inventor 2 中文网
...在粘贴的块中重命名为 X2。
同样，如果你尝试粘贴过程 foo 的过程定义，并且工作区已包含 foo 的定义，则粘贴的过程将被重命名为 foo2。
可以将代码块粘贴到任何项目或屏幕中吗？
是的。 但是，在某些情况下，将背包中的...
Difference between “@id/” and “@+id/” in Android
...roid:id/list">
What's the difference?
.. I'm glad you asked ☺
@+id/foo means you are creating an id named foo in the namespace of your application.
You can refer to it using @id/foo.
@android:id/foo means you are referring to an id defined in the android namespace.
The '+' means to create t...
How do I create a parameterized SQL query? Why Should I?
...n example of how you do parameters with Sql Server:
Public Function GetBarFooByBaz(ByVal Baz As String) As String
Dim sql As String = "SELECT foo FROM bar WHERE baz= @Baz"
Using cn As New SqlConnection("Your connection string here"), _
cmd As New SqlCommand(sql, cn)
cmd.Pa...
Java switch statement: Constant expression required, but it IS constant
... expression to be known at compile time to compile a switch, but why isn't Foo.BA_ constant?
While they are constant from the perspective of any code that executes after the fields have been initialized, they are not a compile time constant in the sense required by the JLS; see §15.28 Constant Ex...
Asynchronous method call in Python?
...
Something like:
import threading
thr = threading.Thread(target=foo, args=(), kwargs={})
thr.start() # Will run "foo"
....
thr.is_alive() # Will return whether foo is running currently
....
thr.join() # Will wait till "foo" is done
See the documentation at https://docs.python.org/librar...
What's the best way to refactor a method that has too many (6+) parameters?
...are multiple overloaded variants, you should look at the Builder pattern:
Foo foo = new Foo()
.configBar(anything)
.configBaz(something, somethingElse)
// and so on
If it's a normal method, you should think about the relationships between the values being passed, and...
What is the difference between Scope_Identity(), Identity(), @@Identity, and Ident_Current()?
...PE_IDENTITY(), as opposed to the global scope of @@IDENTITY.
CREATE TABLE Foo(
ID INT IDENTITY(1,1),
Dummy VARCHAR(100)
)
CREATE TABLE FooLog(
ID INT IDENTITY(2,2),
LogText VARCHAR(100)
)
go
CREATE TRIGGER InsertFoo ON Foo AFTER INSERT AS
BEGIN
INSERT INTO FooLog (LogText) VALUES ('inser...
Difference between compile and runtime configurations in Gradle
... at runtime. For example, let's say that a program called app uses library foo, and library foo internally uses library bar. Then only foo is needed to compile app, but both foo and bar are needed to run it. This is why by default, everything that you put on Gradle's compile configuration is also vi...
warning: incompatible implicit declaration of built-in function ‘xyz’
...;
}
Compiled like this on Fedora 17 Linux 64 bit with gcc:
el@defiant ~/foo2 $ gcc -o n n2.c
n2.c: In function ‘main’:
n2.c:2:3: warning: incompatible implicit declaration of built-in
function ‘exit’ [enabled by default]
el@d...
Gradle to execute Java class (without modifying build.gradle)
...e' line: 4
* What went wrong:
A problem occurred evaluating root project 'Foo'.
> Could not find property 'mainClass' on task ':execute'.
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