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When to use Hadoop, HBase, Hive and Pig?
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Consider that you work with RDBMS and have to select what to use - full table scans, or index access - but only one of them.
If you select full table scan - use hive. If index access - HBase.
s...
How to do this using jQuery - document.getElementById(“selectlist”).value
In jQuery, what is the equivalent to document.getElementById("selectlist").value ?
6 Answers
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How do I force Postgres to use a particular index?
...d, client_id, date, and description. You want to run the following query:
SELECT client_id, SUM(amount)
FROM transactions
WHERE date >= 'yesterday'::timestamp AND date < 'today'::timestamp AND
description = 'Refund'
GROUP BY client_id
PostgreSQL may choose to use the index transaction...
How to show Page Loading div until the page has finished loading?
...eforeSend: function(xhr){ <---- use this option here
$('.select_element_you_want_to_load_into').html('Loading...');
},
success: function(msg){
$('.select_element_you_want_to_load_into').html(msg);
}
});
EDIT
I see, in that case, using one of the 'display:block'/'displ...
Android studio, gradle and NDK
...K toolchain via Gradle and CMake. Now, when you create a new project, just select C++ support and you're good to go.
You'll still need to generate your own JNI layer code, or use the SWIG technique I've mentioned above, but the scaffolding of a C++ in Android project is trivial now.
Changes in th...
Map Tiling Algorithm
... this algorithm is to use a pre-processing step to find all edges and then select the correct smoothing tile according to the shape of the edge.
The first step would be to find all edges. In the example below the edge tiles marked with an X are all green tiles with a tan tile as one or more of thei...
Getting exact error type in from DbValidationException
... string errorMessages = string.Join("; ", ex.EntityValidationErrors.SelectMany(x => x.ValidationErrors).Select(x => x.PropertyName + ": " + x.ErrorMessage));
throw new DbEntityValidationException(errorMessages);
}
}
This will overwrite your context's SaveChanges() method a...
How to calculate the SVG Path for an arc (of a circle)
...so far, there are actually four arcs that could be drawn, so the two flags select one of them. I'm guessing you probably want to draw a small arc (meaning large-arc-flag=0), in the direction of decreasing angle (meaning sweep-flag=0). All together, the SVG path is:
M 200 175 A 25 25 0 0 0 182.322 2...
How to Use slideDown (or show) function on a table row?
...uld try wrapping the contents of the row in a <span> and having your selector be $('#detailed_edit_row span'); - a bit hackish, but I just tested it and it works. I also tried the table-row suggestion above and it didn't seem to work.
update: I've been playing around with this problem, and fr...
When should you use 'friend' in C++?
...te, the C++ FAQ mentions that friend enhances encapsulation. friend grants selective access to members, just like protected does. Any fine-grained control is better than granting public access. Other languages define selective access mechanisms too, consider C#'s internal. Most negative criticism ar...