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Postgresql: Conditionally unique constraint
...esn't define a partial (i.e. conditional) UNIQUE constraint - however, you can create a partial unique index. PostgreSQL uses unique indexes to implement unique constraints, so the effect is the same, you just won't see the constraint listed in information_schema.
CREATE UNIQUE INDEX stop_myc ON st...
Collections.emptyList() returns a List?
...ded it with the type, so it defaults to returning List<Object>. You can supply the type parameter, and have your code behave as expected, like this:
public Person(String name) {
this(name,Collections.<String>emptyList());
}
Now when you're doing straight assignment, the compiler ca...
Git: copy all files in a directory from another branch
How do I copy all files in a directory from another branch? I can list all of the files in that directory by doing
2 Answe...
What is the difference between `git fetch origin` and `git remote update origin`?
...git remote update instead of git fetch . I have read both man pages but cannot say I understood either in its entirety.
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Regex for string contains?
... string contains a certain word (e.g. 'Test')? I've done some googling but can't get a straight example of such a regex. This is for a build script but has no bearing to any particular programming language.
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Match whole string
...nations match a whole string, it might be necessary to wrap it with a (non)capturing group: /^(?:abc|def)$/ or /^(abc|def)$/. Otherwise, if the group is not used, /^abc|def$/ will match abc at the start of the string OR def at the end of the string.
– Wiktor Stribiżew
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How to sort an array of objects by multiple fields?
...
Original function:
var sort_by = function() {
var fields = [].slice.call(arguments),
n_fields = fields.length;
return function(A,B) {
var a, b, field, key, primer, reverse, result, i;
for(i = 0; i < n_fields; i++) {
result = 0;
field = fields...
Specify format for input arguments argparse python
...any necessary type-checking and type conversions to be performed ... type= can take any callable that takes a single string argument and returns the converted value
You could do something like:
def valid_date(s):
try:
return datetime.strptime(s, "%Y-%m-%d")
except ValueError:
...
How to make git ignore changes in case?
... on here, but sometimes a particular file in my repository will change the case of it's name. e.g.,:
4 Answers
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How can I make a ComboBox non-editable in .NET?
...pDownList". The ComboBox is now essentially select-only for the user. You can do this in the Visual Studio designer, or in C# like this:
stateComboBox.DropDownStyle = ComboBoxStyle.DropDownList;
Link to the documentation for the ComboBox DropDownStyle property on MSDN.
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