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What are the differences between Abstract Factory and Factory design patterns?
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Abstract factory creates a base class with abstract methods defining methods for the objects that should be created. Each factory class which derives the base class can create their own implementation of each object type.
Factory method is just a si...
How do you manage databases in development, test, and production?
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Name your databases as follows - dev_<<db>> , tst_<<db>> , stg_<<db>> , prd_<<db>> (Obviously you never should hardcode db names
Thus you would be able to deploy even the different type of db's on same physical ...
How to print the contents of RDD?
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// For implicit conversion from RDD to DataFrame
import spark.implicits._
fruits = sc.parallelize([("apple", 1), ("banana", 2), ("orange", 17)])
// convert to DF then show it
fruits.toDF().show()
This will show the top 20 lines of your data, so the size of your data should not be an issue.
+...
system(“pause”); - Why is it wrong?
...utable named "pause"!)
Simply write your own "Pause()" function that uses _getch. OK, sure, _getch is platform dependent as well (note: it's defined in "conio.h") - but it's much nicer than system() if you are developing on Windows and it has the same effect (though it is your responsibility to pro...
How can I remove all my changes in my SVN working directory?
...relies on (I believe) a GNU-specific extension which allows xargs to split based on '\0' instead of whitespace.
The advantage to the above command is that it does not require any network activity to reset the sandbox. You get exactly what you had before, and you lose all your changes. (disclaimer b...
Two submit buttons in one form
...l be sent through as any other input.
<input type="submit" name="button_1" value="Click me">
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How do I expand a tuple into variadic template function's arguments?
...meters
*
* @tparam N Number of tuple arguments to unroll
*
* @ingroup g_util_tuple
*/
template < uint N >
struct apply_obj_func
{
template < typename T, typename... ArgsF, typename... ArgsT, typename... Args >
static void applyTuple( T* pObj,
void (T::*...
Tools to generate database tables diagram with Postgresql? [closed]
...d look something like:
java -jar schemaspy-6.0.0-rc2.jar -t pgsql -db database_name -host myhost -u username -p password -o ./schemaspy -dp postgresql-9.3-1100.jdbc3.jar -s public -noads
Sometimes using options -port will not working if your database has diferrent port, so you have to add manual ...
MongoDB mongorestore failure: locale::facet::_S_create_c_locale name not valid
...cale-gen" was not installed and it turned out all I had to do is set the LC_ALL environment variable.
so the following command fixed it:
export LC_ALL="en_US.UTF-8"
hopefully it will help someone else...
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Check if a user has scrolled to the bottom
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@KevinVella Vella good combination is to use this with _.debounce() in underscore utility to prevent it firing until user has stopped scrolling - underscorejs.org/#debounce -
– JohnnyFaldo
Feb 10 '14 at 11:27
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