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What is the meaning and difference between subject, user and principal?

... These are hierarchical in the way that genus, species and individual are hierarchical. Subject - In a security context, a subject is any entity that requests access to an object. These are generic terms used to denote the thing requesting access and the thing the request is made again...
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Position an element relative to its container

...ike to create the bars using DIVs with background colors and percentage widths depending on the values I want to graph. I also want to have a grid lines to mark an arbitrary position along the graph. ...
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Copy rows from one Datatable to another DataTable?

... Try This String matchString="ID0001"//assuming we have to find rows having key=ID0001 DataTable dtTarget = new DataTable(); dtTarget = dtSource.Clone(); DataRow[] rowsToCopy; rowsToCopy = dtSource.Select("key='" + matchString + "'"); ...
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UIButton: set image for selected-highlighted state

...elected, but when the button in selected state and I press/highlight it I didn't see my highlighted image but just grayed picture. Is it possible to set an image for highlighted state when the button selected? ...
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Xcode iOS 8 Keyboard types not supported

...TextField Ctrl-dragged as an @Outlet in my .swift class. Now in viewDidLoad i'm using this code 10 Answers ...
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How to check SQL Server version

...ound Method 4 to be more reliable than Method 1 -- I've had servers which didn't get a service pack installed correctly where Method 1 and Method 4 returned different results, but Method 4 was correct. – Kaganar Apr 23 '15 at 13:53 ...
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What is the meaning of symbol $ in jQuery?

... By default, jQuery uses "$" as a shortcut for "jQuery" So, using $("#id") or jQuery("#id") is the same. share | improve this answer | follow | ...
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Structs versus classes

...mall 2. Logically an immutable value 3. There's a lot of them Then I'd consider making it a struct. Otherwise I'd stick with a reference type. If you need to mutate some field of a struct it is usually better to build a constructor that returns an entire new struct with the field set correctly. Tha...
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Is it possible to override the configuration of a plugin already defined for a profile in a parent P

...defining some configurations useful for this project (so that I can't get rid of this parent POM) : 3 Answers ...
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Physical vs. logical / soft delete of database record?

...users username for new records. Working around this you could tack on a GUID to the deleted username column, but it's a very hacky workaround that I wouldn't recommend. Probably in that circumstance it would be better to just have a rule that once a username is used, it can never be replaced.) ...