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@Basic(optional = false) vs @Column(nullable = false) in JPA
...Architecture Committee Member, TopLink Core Technical Lead, JPA 2.0 Expert Group Member) wrote a good answer on this topic so instead of paraphrasing him, I'll quote his answer:
The difference between optional and
nullable is the scope at which they
are evaluated. The definition of
'option...
Android ViewPager with bottom dots
...
I think the linear layout is so that it will center and group the dots.
– ShawnV
Sep 7 '15 at 6:08
add a comment
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How to display hidden characters by default (ZERO WIDTH SPACE ie. ​)
...f this ... joker - zero width space. I just used some snippets from google groups and didn't recognize that there are doubled characters, because Idea (11) didn't show them, which was causing problems with parsing config file of my app... I discovered it accidentally in vi.
...
How to suppress specific MSBuild warning
...ust set in project file (*.csproj) that cause such warning.
<PropertyGroup>
<Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
<Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
<!-- some code goes here -->
&l...
What's the difference between struct and class in .NET?
...ence is usage. From MSDN: "structs are typically used to encapsulate small group of related variables, such as coordinates of rectangle. Structs can also contain constructors, constants, fields, methods, properties, indexers, operators, events, and nested types, although if several such members are ...
How does the algorithm to color the song list in iTunes 11 work? [closed]
... function instead...
A simple method to calculate the dominant color in a group of pixels is to collect all pixels into buckets of similar colors and then find the largest bucket.
DominantColorSimple[pixelArray_] :=
Module[{buckets},
buckets = Gather[pixelArray, ColorDistance[#1,#2] &l...
List columns with indexes in PostgreSQL
...um = ANY(ix.indkey)
and t.relkind = 'r'
and t.relname like 'test%'
group by
t.relname,
i.relname
order by
t.relname,
i.relname;
table_name | index_name | column_names
------------+------------+--------------
test | pk_test | a, b
test2 | uk_test2 | b, c
t...
How to make child process die after parent exits?
...(2) and (since Linux 2.4.36 / 2.6.23) when executing a set-user-ID or set-group-ID binary.
– qrdl
Dec 10 '16 at 19:46
...
Foreign key constraint may cause cycles or multiple cascade paths?
...r ways(stored procedures; triggers; by code etc). But I keep your solution(grouping in one path) in mind for possible different applications of same problem...
– freewill
Feb 14 '14 at 21:39
...
JavaScript Chart Library
...ed on SVG. It is called Protovis and it comes from Stanford Visualization Group
It also allows making nice interactive graphics and visualizations.
http://vis.stanford.edu/protovis/ex/
Although it is only for modern web browsers
UPDATE: The protovis team has moved to another library called d3.j...