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MongoDb query condition on comparing 2 fields
...have a collection T , with 2 fields: Grade1 and Grade2 , and I want to select those with condition Grade1 > Grade2 , how can I get a query like in MySQL?
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How do I read and parse an XML file in C#?
...then find a node below it ie like this
XmlNode node = doc.DocumentElement.SelectSingleNode("/book/title");
or
foreach(XmlNode node in doc.DocumentElement.ChildNodes){
string text = node.InnerText; //or loop through its children as well
}
then read the text inside that node like this
string...
How do I analyze a .hprof file?
...unning a form of limited SQL (OQL) against the in-memory objects, i.e.
SELECT toString(firstName) FROM com.yourcompany.somepackage.User
Totally brilliant.
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Making HTTP Requests using Chrome Developer tools
...Chrome Developer Tools' Network tab:
Right-click the Name of the request
Select Copy > Copy as cURL
Paste to the command line (command includes cookies and headers)
Edit request as needed and run
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How to use XPath in Python?
...thFreeContext(). This is not very Pythonic.
If you are doing simple path selection, stick with ElementTree ( which is included in Python 2.5 ). If you need full spec compliance or raw speed and can cope with the distribution of native code, go with libxml2.
Sample of libxml2 XPath Use
import l...
Ruby on Rails: how do I sort with two columns using ActiveRecord?
...ersonally I find it easier to manage.
SQL gets produced in one step only:
SELECT "models".* FROM "models" ORDER BY "models"."etc" ASC, "models"."bar" DESC, "models"."foo" ASC
Thusly, for the original question:
Model.order(:updated_at).order(:price)
You need not declare data type, ActiveRecord ...
How do I join two lines in vi?
...
If you want to join the selected lines (you are in visual mode), then just press gJ to join your lines with no spaces whatsoever.
This is described in greater detail on the vi/Vim Stack Exchange site.
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Untrack files from git temporarily
...to remove ALL the files in the build folder or the bin folder, Rather than selecting each files separately.
You can use this command:
git rm -r -f /build\*
Make sure that you are in the parent directory of the build directory.
This command will, recursively "delete" all the files which are in the...
AWS S3 copy files and folders between two buckets
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You can now do it from the S3 admin interface. Just go into one bucket select all your folders actions->copy. Then move into your new bucket actions->paste.
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IntelliJ: Never use wildcard imports
...open "Imports" under "Code Style", and check the "Use single class import" selection. You can also completely remove entries under "Packages to use import with *", or specify a threshold value that only uses the "*" when the individual classes from a package exceeds that threshold.
Update: in IDEA...