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Do I need to heartbeat to keep a TCP connection open?
...rdless but yes it's often common to see protocols implement a heartbeat in order to help detect dead connections, IRC with the PING command for example.
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psql: FATAL: Peer authentication failed for user “dev”
...ly locally accessible, with no network access.
Important note:
Definition order in pg_hba.conf matters - rules are read from top to bottom, like iptables, so you probably want to add proposed rules above the rule:
host all all 127.0.0.1/32 ident
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What is stack unwinding?
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reading Nikolai's, jrista's and your answer in this order, now it makes sense!
– n611x007
Aug 10 '12 at 13:46
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How to sort an array of hashes in ruby
...ashes.sort_by(&:zip)
Note that sort_by method will sort by ascending order.
If you need to sort with descending order you could do something like this:
array_of_hashes.sort_by!(&:zip).reverse!
or
array_of_hashes = array_of_hashes.sort_by(&:zip).reverse
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Is it expensive to use try-catch blocks even if an exception is never thrown?
...erved as though its statements, as written in the source code, executed in order up to some line.
Because in a try block an exception can be thrown (at any line in the try block! Some exceptions are thrown asynchronously, such as by calling stop on a Thread (which is deprecated), and even besides t...
Standard Android Button with a different color
I'd like to change the color of a standard Android button slightly in order to better match a client's branding.
20 Answers...
CORS Access-Control-Allow-Headers wildcard being ignored?
...ID, Meter, Negotiate, Non-Compliance, OPTION, OPTIONS, OWS, Opt, Optional, Ordering-Type, Origin, Overwrite, P3P, PEP, PICS-Label, POST, PUT, Pep-Info, Permanent, Position, Pragma, ProfileObject, Protocol, Protocol-Query, Protocol-Request, Proxy-Authenticate, Proxy-Authentication-Info, Proxy-Authori...
How can I return pivot table output in MySQL?
...NT x pages) resemble conditions. The main grouping is by company_name.
In order to set up the conditions this rather shouts for using the CASE-statement. In order to group by something, well, use ... GROUP BY.
The basic SQL providing this pivot can look something like this:
SELECT P.`company_nam...
SQL keys, MUL vs PRI vs UNI
... column of a table, Key displays the one with the highest priority, in the order PRI, UNI, MUL.
As a general note, the MySQL documentation is quite good. When in doubt, check it out!
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Dialog throwing "Unable to add window — token null is not for an application” with getApplication()
...n that.. you may sometimes need to store "this" globally, (for example) in order to access it within a listener's implemented method who has it's own 'this'. In that case, you'd define "Context context" globally, and then in the onCreate, set "context = this", and then refer to "context". Hope that ...