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Collections.emptyMap() vs new HashMap()
...n: If you have an API where clients are expected to modify the collection, then yes, it does not make sense to return an immutable collection. But if you have an API where you return a collection that clients must not modify and should just iterate on, then returning a view to the underlying collect...
How can I easily view the contents of a datatable or dataview in the immediate window
...e over your DataSet, expand the quick watch, view the Tables, expand that, then view Table[0] (for example). You will see something like {Table1} in the quick watch, but notice that there is also a magnifying glass icon. Click on that icon and your DataTable will open up in a grid view.
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Using module 'subprocess' with timeout
... have been forced to write "parent loops" which launch a child process and then sit in a "sleep"y loop watching the clock (and possibly also monitoring output from the child).
– Peter
Jul 29 '11 at 0:54
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Select values from XML field in SQL Server 2008
...uch data.
So, here's my simple example of how you'd create an xml object, then read out its values into a table.
DECLARE @str nvarchar(2000)
SET @str = ''
SET @str = @str + '<users>'
SET @str = @str + ' <user>'
SET @str = @str + ' <firstName>Mike</firstName>'
SET @str...
Why does “pip install” inside Python raise a SyntaxError?
...ules, so you can use them from Python. Once you have installed the module, then you can open the Python shell and do import selenium.
The Python shell is not a command line, it is an interactive interpreter. You type Python code into it, not commands.
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How can I define a composite primary key in SQL?
...RIMARY KEY (QuestionID, MemberID)
);
The pair (QuestionID,MemberID) must then be unique for the table and neither value can be NULL. If you do a query like this:
SELECT * FROM voting WHERE QuestionID = 7
it will use the primary key's index. If however you do this:
SELECT * FROM voting WHERE Me...
get dictionary key by value
...").Key;
If values are unique and are inserted less frequently than read, then create an inverse dictionary where values are keys and keys are values.
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Difference between a user and a schema in Oracle?
...r schema "foo" for example, if user "foo" creates or refers to table "bar" then Oracle will assume that the user means "foo.bar".
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What's the state of the art in email validation for Rails?
...cumentation is complete. If you're not familiar with Rails 3+ validations, then check out this Railscast (railscasts.com/episodes/211-validations-in-rails-3) or guides.rubyonrails.org/active_record_validations.html
– balexand
Dec 4 '13 at 19:34
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PHP + MySQL transactions examples
...ut in class DB (for example), $query - not once - maybe $query0 $query1 - then chek them - i use this code, this very easy to understand =)
– Gedzberg Alex
Oct 18 '12 at 10:55
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