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How should equals and hashcode be implemented when using JPA and Hibernate
How should model class's equals and hashcode be implemented in Hibernate? What are the common pitfalls? Is the default implementation good enough for most cases? Is there any sense to use business keys?
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Which is faster: multiple single INSERTs or one multiple-row INSERT?
...-optimization.html
The time required for inserting a row is determined by the following factors, where the numbers indicate approximate proportions:
Connecting: (3)
Sending query to server: (2)
Parsing query: (2)
Inserting row: (1 × size of row)
Inserting indexes: (1 × number o...
How to properly ignore exceptions
...ption:
pass
The difference is that the first one will also catch KeyboardInterrupt, SystemExit and stuff like that, which are derived directly from exceptions.BaseException, not exceptions.Exception.
See documentation for details:
try statement
exceptions
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Why there is no ForEach extension method on IEnumerable?
Inspired by another question asking about the missing Zip function:
20 Answers
20
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How to check if an array field contains a unique value or another array in MongoDB?
I am using mongodb now.
2 Answers
2
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When tracing out variables in the console, How to create a new line?
So I'm trying to do something simple, I want to break up my traces in the console into several lines, using 1 console.log statement:
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Storing Images in PostgreSQL
Alright, so I'm working on an application which will use a Linux back-end running PostgreSQL to serve up images to a Windows box with the front end written in C#.NET, though the front-end should hardly matter. My question is:
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Host 'xxx.xx.xxx.xxx' is not allowed to connect to this MySQL server
This should be dead simple, but I cannot get it to work for the life of me.
I'm just trying to connect remotely to my MySQL server.
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keep rsync from removing unfinished source files
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It seems to me the problem is transferring a file before it's complete, not that you're deleting it.
If this is Linux, it's possible for a file to be open by process A and process B can unlink the file. There's no error, but of course A is wasti...
Eclipse “Invalid Project Description” when creating new project from existing source
... same name. The reason is that I created that project from the source code before, but then I deleted that project and deleted its whole directory, before adding the source code directory again. I tried everything like cleaning and restarting, but nothing worked. I looked in my workspace directory, ...