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Why does Java's hashCode() in String use 31 as a multiplier?
...t so many Java implementations choose such constants.
See section 9.2 Hash Tables (page 522) of Data Structures and Algorithms in Java.
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Spring MVC: Complex object as GET @RequestParam
Suppose i have a page that lists the objects on a table and i need to put a form to filter the table. The filter is sent as an Ajax GET to an URL like that: http://foo.com/system/controller/action?page=1&prop1=x&prop2=y&prop3=z
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Creating a copy of a database in PostgreSQL [closed]
...rday it worked, now random unique constrain are violated. Note: I drop all table to receiver db.
– gunzapper
Apr 1 '16 at 10:45
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How to return an empty ActiveRecord relation?
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A more portable solution that doesn't require an "id" column and doesn't assume there won't be a row with an id of 0:
scope :none, where("1 = 0")
I'm still looking for a more "correct" way.
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Customizing Bootstrap CSS template
...c selector for this topbar and use this rule on the specific topbar. For a table for example, it would be <table class="zebra-striped mycustomclass">. If you declare your css file after bootstrap.css, this will overwrite whatever you want to.
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Best way to create unique token in Rails?
... For a 32-bit IP address, it would be fairly easy to have a lookup table of all of any possible hexdigest generated by @thekingoftruth, so don't anyone go thinking that even a substring of the hash will be irreversible.
– mwfearnley
Mar 24 '16 at 17:24
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Why does Sql Server keep executing after raiserror when xact_abort is on?
...nd executes a stored procedure that we assume will fail:
assume we have a table [dbo].[Errors] to hold errors
assume we have a stored procedure [dbo].[AssumeThisFails] which will fail when we execute it
-- first lets build a temporary table to hold errors
if (object_id('tempdb..#RAISERRORS') is nu...
What's faster, SELECT DISTINCT or GROUP BY in MySQL?
If I have a table
15 Answers
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MySQL Results as comma separated list
... you can use just concat()
Select concat(Col1, ',', Col2) as Foo_Bar from Table1;
edit this only works in mySQL; Oracle concat only accepts two arguments. In oracle you can use something like select col1||','||col2||','||col3 as foobar from table1;
in sql server you would use + instead of pipes....
How to Right-align flex item?
... Thanks. Would you personally prefer this over Yohann Tilotti's display table method above? If so, why?
– Mark Boulder
Mar 16 '14 at 4:19
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