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Postgresql: Conditionally unique constraint
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Collections.emptyList() returns a List?
...String>emptyList());
}
Now when you're doing straight assignment, the compiler can figure out the generic type parameters for you. It's called type inference. For example, if you did this:
public Person(String name) {
List<String> emptyList = Collections.emptyList();
this(name, emp...
Git: copy all files in a directory from another branch
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What about if I wanted to retain commit messages for the files copied over?
– totels
Apr 19 '11 at 11:43
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Specify format for input arguments argparse python
I have a python script that requires some command line inputs and I am using argparse for parsing them. I found the documentation a bit confusing and couldn't find a way to check for a format in the input parameters. What I mean by checking format is explained with this example script:
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SET versus SELECT when assigning variables?
...iable to null prior to the select. Once you factor that in, how do the two compare for performance? (Side note: I don't understand the rationale for select not setting your variable to null in the event a query returns null. When would you ever want that?)
– youcantryreachingme...
Need to reset git branch to origin version
...t reset --hard origin/mybranch
(Make sure that you reference your latest commit in a separate branch, like you mention in your question)
Note that just after the reset, mybranch@{1} refers to the old commit, before reset.
But if you had already pushed, see "Create git branch, and revert original...
How can I make a ComboBox non-editable in .NET?
I want to have a "select-only" ComboBox that provides a list of items for the user to select from. Typing should be disabled in the text portion of the ComboBox control.
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In Git, how do I figure out what my current revision is?
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What do you mean by "version number"? It is quite common to tag a commit with a version number and then use
$ git describe --tags
to identify the current HEAD w.r.t. any tags. If you mean you want to know the hash of the current HEAD, you probably want:
$ git rev-parse ...