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What are the disadvantages of using persistent connection in PDO
... of a transaction, that can block a multitude of tables until the deadlock timer kicks in, and even then, the deadlock timer can kill the newer request instead of the older request that's causing the problem.
If the dead script was in the middle of a transaction, the next script that gets that conn...
Unique Constraint in Entity Framework Code First
...e's still the possibility of another insert/update slipping in between the time of the uniqueness check and the time of SaveChanges(). So, depending on how mission critical the app is and the liklihood of a uniqueness violation, it's probably best to add the constraint to the database.
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Is it possible to cherry-pick a commit from another git repository?
...hing brings in all of the other repo's changes. This command line is a one-time action.
– Jonathon Reinhart
Jan 4 '17 at 15:05
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how to split the ng-repeat data with three columns using bootstrap
...e.
The problem with this filter is that it returns new nested arrays each time. Angular is watching the return value from the filter. The first time the filter runs, Angular knows the value, then runs it again to ensure it is done changing. If both values are the same, the cycle is ended. If not, t...
std::auto_ptr to std::unique_ptr
...ry, std::unique_ptr is an unbroken std::auto_ptr. It disallows at compile time behaviors that were often errors when using a std::auto_ptr. So if you used std::auto_ptr with the care it needed, switching to std::unique_ptr should be simple. If you relied on std::auto_ptr's odd behavior, then you...
Prevent double submission of forms in jQuery
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Eg, if the form creates an order, put a unique ID in the form. The first time the server sees an order creation request with that id, it should create it and respond "success". Subsequent submissions should also respond "success" (in case the client didn't get the first response) but shouldn't cha...
App Inventor 2 扩展 · App Inventor 2 中文网
...ImageProcessorDemo.aia
SoundAnalysis created by Mouhamadou Oumar Sall
Multimedia component that analyzes the pitch of a sound through the microphone and returns it. It can be used as an input to different situations, for instance to control some components with a specific sound whistle(pitch > 500...
RVM is not a function, selecting rubies with 'rvm use …' will not work
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@AdityaPednekar So, sometimes reading the error/console message actually helps, RVM is not a function, selecting rubies with 'rvm use ...' will not work. You need to change your terminal emulator preferences to allow login shell. Sometimes it is ...
How does a PreparedStatement avoid or prevent SQL injection?
...ected in Query optimization plan is stored in cache, so that whenever next
time same query comes in, it doesn't have to pass through Phase 1, Phase 2 and Phase 3 again.
When next time query come in, it will be checked directly in Cache and picked up from there
to execute.
Execution Phase:
In this ph...
Neo4j - Cypher vs Gremlin query language
... implementing our algorithm directly against the Java API would be 100-200 times faster. We did so and got easily factor 60 out of it. As of now we have no single Cypher query in our system due to lack of confidence. Easy Cypher queries are easy to write in Java, complex queries won't perform. The p...