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Differences between action and actionListener
...action get executed, e.g. to log it, and/or to set an additional property (by <f:setPropertyActionListener>), and/or to have access to the component which invoked the action (which is available by ActionEvent argument). So, purely for preparing purposes before the real business action gets inv...
Transaction isolation levels relation with locks on table
...s only committed. This means A writes data and B can't read the data saved by A until A executes a commit. The problem here is that C can update data that was read and used on B and B client won't have the updated data.
REPEATABLE READ - lock on a block of SQL(which is selected by using select query...
How can I kill a process by name instead of PID?
...web server daemon, is setup as a Service with it's own user. So specifying by user is a simple / easy way to trigger a restart.
– Raystorm
Feb 10 '15 at 20:09
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When to add what indexes in a table in Rails
...ndex" to the automatically created "id" column?
No, this is already done by rails
Should I add "index(unique)" to the automatically created "id" column?
No, same as above
If I add index to two foreign keys at once (add_index (:users, [:category_id, :state_id]), what happens? How is this ...
How can I add a class attribute to an HTML element generated by MVC's HTML Helpers?
...tribute the existing <fieldset/> element which encapsulates any form by default in web pages generated by ASP.NET MVC. A CSS class on the form is rarely necessary.
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Spring @Transactional - isolation, propagation
...mmitted, which only lets you read values which have already been committed by other running transactions, in combination with a propagation level of Required. Then you can work from there if your application has other needs.
A practical example of where a new transaction will always be created w...
Is Redis just a cache?
...mple, a Question is a map with fields {id, title, date_asked, votes, asked_by, status}. Similarly, an Answer is a map with fields {id, question_id, answer_text, answered_by, votes, status}. Similarly, we can model a user object.
Each of these objects can be directly stored in Redis as a Hash. To ge...
Mythical man month 10 lines per developer day - how close on large projects? [closed]
..."lines spent".
- Edsger Dijkstra
Some times you have contributed more by removing code than adding
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answered Sep 16 '10 at 9:22
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Pointer vs. Reference
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Explain what you mean by arithmetic. A new user may not understand that you want to adjust what the pointer is pointing at.
– Martin York
Sep 22 '08 at 16:30
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Database development mistakes made by application developers [closed]
What are common database development mistakes made by application developers?
40 Answers
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