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SQL how to increase or decrease one for a int column in one command
...at is, you try to do the creation first. If it's already there, ignore the error. Otherwise you create it with a 0 value.
Then do the update which will work correctly whether or not:
the row originally existed.
someone updated it between your insert and update.
It's not a single instruction and...
How to read an external properties file in Maven
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Thanks for a working example. However, why I got an error of Plugin execution not covered by lifecycle configuration: org.codehaus.mojo:properties-maven-plugin:1.0-alpha-1:read-project-properties (execution: default, phase: initialize)
– WesternGun
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Use of exit() function
... means your program completed successfully, and nonzero values are used as error codes.
There are also predefined macros EXIT_SUCCESS and EXIT_FAILURE, e.g. exit(EXIT_SUCCESS);
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Create new tmux session from inside a tmux session
...use we're creating a new detached session. Otherwise you'll get a nesting error.
$ tmux new -s development -d
$ tmux new -s foo -d
$ tmux ls
> development: 1 windows (created Wed Jan 13 11:31:38 2016) [204x54]
> foo: 1 windows (created Wed Jan 13 11:31:38 2016) [204x54]
$ tmux attach -t
$ tm...
C++静态和多态，亦敌亦友 - C/C++ - 清泛网 - 专注C/C++及内核技术
...代码编译不能通过。显示如下信息：
stawithvir.cpp:19:17: error: ‘static void DerivedAgain::foo()’ cannot be declared
stawithvir.cpp:13:10: error: since ‘virtual void Derived::foo()’ declared in base class
很明显，编译不能通过的原因，是在De...
What is __gxx_personality_v0 for?
.... I added CPPFLAGS += -fno-exceptions to my makefile, and that solved the error.
– Alan Kinnaman
Jun 14 '16 at 22:56
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Delete element in a slice
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@DaveC I do get that error when working with my slices in my project :/
– Tyguy7
Dec 16 '16 at 17:34
3
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Rails migration: t.references with alternative name?
...fy a foreign_key option in the table creation like this ways, it raises an error saying the very table I'm creating doesn't exist... So I suspect it's not really supported by the official API.
– Quv
Nov 7 '17 at 3:53
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Interfaces with static fields in java for sharing 'constants'
...tatic import, we should use classes instead of intefaces to re-do the same error as before?! That's silly!
– gizmo
Nov 26 '08 at 13:06
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Get current clipboard content? [closed]
...nsole.log('Pasted content: ', text);
})
.catch(err => {
console.error('Failed to read clipboard contents: ', err);
});
Or with async syntax:
const text = await navigator.clipboard.readText();
Keep in mind that this will prompt the user with a permission request dialog box, so no funny...