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How do I update an entity using spring-data-jpa?
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Identity of entities is defined by their primary keys. Since firstnam>me m> and lastnam>me m> are not parts of the primary key, you cannot tell JPA to treat Users with the sam>me m> firstnam>me m>s and lastnam>me m>s as equal if they have different userIds.
So, if you want to update a User identified by its firstnam...
How to easily initialize a list of Tuples?
...d "Item2", you can do:
var tupleList = new List<(int Index, string Nam>me m>)>
{
(1, "cow"),
(5, "chickens"),
(1, "airplane")
};
or for an array:
var tupleList = new (int Index, string Nam>me m>)[]
{
(1, "cow"),
(5, "chickens"),
(1, "airplane")
};
wh...
Delete rows from a pandas DataFram>me m> based on a conditional expression involving len(string) giving K
I have a pandas DataFram>me m> and I want to delete rows from it where the length of the string in a particular column is greater than 2.
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Should I use int or Int32
In C#, int and Int32 are the sam>me m> thing, but I've read a number of tim>me m>s that int is preferred over Int32 with no reason given. Is there a reason, and should I care?
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Random row from Linq to Sql
...to retrieve a random row using Linq to SQL when I have a condition, e.g. som>me m> field must be true?
15 Answers
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How to escape single quotes within single quoted strings
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If you really want to use single quotes in the outermost layer, rem>me m>mber that you can glue both kinds of quotation. Example:
alias rxvt='urxvt -fg '"'"'#111111'"'"' -bg '"'"'#111111'"'"
# ^^^^^ ^^^^^ ^^^^^ ^^^^
# 12345 12345 ...
How do I use JDK 7 on Mac OSX?
I would like to use the WatchService API as m>me m>ntioned in this link:
http://download.oracle.com/javase/tutorial/essential/io/notification.html
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Difference between static and shared libraries?
...ibrary is in this file, and it is referenced by programs using it at run-tim>me m>. A program using a shared library only makes reference to the code that it uses in the shared library.
Static libraries are .a (or in Windows .lib) files. All the code relating to the library is in this file, and it is di...
Send m>me m>ssage to specific client with socket.io and node.js
...node.js and until now it seems pretty good, but I don't know how to send a m>me m>ssage from the server to an specific client, som>me m>thing like this:
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What is the difference between Trap and Interrupt?
...an exception in a user process. It's caused by division by zero or invalid m>me m>mory access. It's also the usual way to invoke a kernel routine (a system call) because those run with a higher priority than user code. Handling is synchronous (so the user code is suspended and continues afterwards). In a...