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How do I modify fields inside the new PostgreSQL JSON datatype?
...a":[null,{"b":[1,2,3]}]}'
For inserting into JSON array (while preserving all of the original values), the jsonb_insert() function can be used (in 9.6+; this function only, in this section):
SELECT jsonb_insert('{"a":[null,{"b":[1]}]}', '{a,1,b,0}', jsonb '2')
-- will yield jsonb '{"a":[null,{"b":[...
How can I iterate over files in a given directory?
I need to iterate through all .asm files inside a given directory and do some actions on them.
9 Answers
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How should I unit test threaded code?
...ads acting upon it, and you can't test situations where these threads step all over each other, then your design needs to be redone. Its both as simple and as complex as this.
There are many ways to program for multithreading that avoids threads running through instances at the same time. The sim...
How to use OrderBy with findAll in Spring Data
...y<StudentEntity, Integer> {
public List<StudentEntity> findAllByOrderByIdAsc();
}
The code above should work. I'm using something similar:
public List<Pilot> findTop10ByOrderByLevelDesc();
It returns 10 rows with the highest level.
IMPORTANT:
Since I've been told that it'...
How to generate UML diagrams (especially sequence diagrams) from Java code?
How can I generate UML diagrams (especially sequence diagrams) from existing Java code?
16 Answers
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How do I ignore a directory with SVN?
...
If you want to ignore more than one file/folder, add all of their names to a txt file, one line each, and use the following variant: svn propset svn:ignore -F file.txt .
– petervaz
Aug 7 '12 at 19:22
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Create an instance of a class from a string
...of a class based on the fact I know the name of the class at runtime. Basically I would have the name of the class in a string.
...
Can you get the column names from a SqlDataReader?
After connecting to the database, can I get the name of all the columns that were returned in my SqlDataReader ?
9 Answers...
How to redirect output to a file and stdout
In bash, calling foo would display any output from that command on the stdout.
10 Answers
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Java: recommended solution for deep cloning/copying an instance
...t hierarchy):
commons-lang SerializationUtils - using serialization - if all classes are in your control and you can force implementing Serializable.
Java Deep Cloning Library - using reflection - in cases when the classes or the objects you want to clone are out of your control (a 3rd party libra...