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What is the difference between properties and attributes in HTML?
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Dynamically changing font size of UILabel
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How to remove a directory from git repository?
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com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
...re, then it means that the DB isn't reachable at all. This can have one or more of the following causes:
IP address or hostname in JDBC URL is wrong.
Hostname in JDBC URL is not recognized by local DNS server.
Port number is missing or wrong in JDBC URL.
DB server is down.
DB server ...
How to send a stacktrace to log4j?
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@Mark: Try to give it a message which is more pertinent to the context than the exception's message, e.g. what was it actually trying to do at the time?
– skaffman
Dec 3 '10 at 16:53
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The cast to value type 'Int32' failed because the materialized value is null
...re might be no elements and sql's SUM returns null whereas c# expect 0.
A more general approach is to use ?? which will be translated to COALESCE whenever there is a risk that the generated SQL returns an unexpected null:
var creditsSum = (from u in context.User
join ch in context.Cr...
How to avoid “RuntimeError: dictionary changed size during iteration” error?
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How can I get the named parameters from a URL using Flask?
...the question for why you shouldn't send a password via a GET (in the URL). More generally, a GET request should have a ? at the beginning of the parameters, so you would want app.route('/?username=<username>&password=<password>'), but Flask will read everything after the question mar...
Validate that end date is greater than start date with jQuery
...I had to separate this into two methods (in hurry), but I'd love to find a more suitable solution!
– sbsatter
Jun 11 '17 at 4:54
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How to prevent form from submitting multiple times from client side?
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