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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 firstname and lastname are not parts of the primary key, you cannot tell JPA to treat Users with the same firstnames and lastnames as equal if they have different userIds.
So, if you w...
How to get database structure in MySQL via query
Is it possible to somehow get structure of MySQL database, or just some table with simple query?
10 Answers
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Get data from fs.readFile
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To elaborate on what @Raynos said, the function you have defined is an asynchronous callback. It doesn't execute right away, rather it executes when the file loading has completed. When you call readFile, control is returned immediately and the next line of code is executed. So when you ca...
Check if Python Package is installed
What's a good way to check if a package is installed while within a Python script? I know it's easy from the interpreter, but I need to do it within a script.
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What exactly is Apache Camel?
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If you have 5 to 10 minutes, I generally recommend people to read this Integration with Apache Camel by Jonathan Anstey. It's a well written piece which gives a brief introduction to and overview of some of Camel's concepts, and it implements a use case with code samples. In it, Jonathan writ...
Wrapping a C library in Python: C, Cython or ctypes?
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ctypes is your best bet for getting it done quickly, and it's a pleasure to work with as you're still writing Python!
I recently wrapped an FTDI driver for communicating with a USB chip using ctypes and it was great. I had it all ...
How can I merge two commits into one if I already started rebase?
... an older commit or “upward” as viewed on the interactive rebase todo list, that is into a commit on a previous line. Changing the command on your todo list’s very first line to squash will always produce this error as there is nothing for the first commit to squash into.
The Fix
First get b...
how does Array.prototype.slice.call() work?
I know it is used to make arguments a real array, but I don't understand what happens when using Array.prototype.slice.call(arguments)
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Fragments onResume from back stack
...ve the same behavior of onResume of an activity, i.e., whenever a fragment is brought to "foreground" (visible to the user) after poping out of the backstack, I'd like some kind of callback to be activated within the fragment (to perform certain changes on a shared UI resource, for instance).
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What does (function($) {})(jQuery); mean?
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Firstly, a code block that looks like (function(){})() is merely a function that is executed in place. Let's break it down a little.
1. (
2. function(){}
3. )
4. ()
Line 2 is a plain function, wrapped in parenthesis to tell the runtime to return the function to the parent s...