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MongoDB: Combine data from multiple collections into one..how?
...is real-time, you can run map-reduce multiple times to merge data together by using the "reduce" out option in MongoDB 1.8+ map/reduce (see http://www.mongodb.org/display/DOCS/MapReduce#MapReduce-Outputoptions). You need to have some key in both collections that you can use as an _id.
For example,...
Byte[] to InputStream or OutputStream
I have a blob column in my database table, for which I have to use byte[] in my Java program as a mapping and to use this data I have to convert it to InputStream or OutputStream . But I don't know what happens internally when I do so. Can anyone briefly explain me what's happening when I do th...
Git: How to diff two different files in different branches?
... Awesome! I was certainly not able to infer that from git help diff. By the way, those don't have to be branch names ahead of the colons, but can be any kind of commit references (e.g. SHA-1 values).
– Steve Jorgensen
Jun 29 '12 at 19:16
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What's the significance of Oct 12 1999? [closed]
...ormsAuthentication , the ASP.NET team chose to expire the FormsAuth cookie by setting the expiration date to "Oct 12 1999".
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How do I correctly clean up a Python object?
...e package_obj will be an instance of type Package (it's the value returned by the __enter__ method). Its __exit__ method will automatically be called, regardless of whether or not an exception occurs.
You could even take this approach a step further. In the example above, someone could still inst...
Reusing a PreparedStatement multiple times
... connections can be shared across multiple threads (i.e. used concurrently by multiple threads) anyway. Every thread should get his own connection from the pool, use it, and return it to the pool again.
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Regex to remove all (non numeric OR period)
...l regex and conditionals. I could provide an answer (although written in Ruby as I don't know c#.
– mindriot
Dec 4 '15 at 4:56
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Merging 2 branches together in GIT
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Case: If you need to ignore the merge commit created by default, follow these steps.
Say, a new feature branch is checked out from master having 2 commits already,
"Added A" , "Added B"
Checkout a new feature_branch
"Added C" , "Added D"
Feature branch then adds two c...
Why do we always prefer using parameters in SQL statements?
... site.
In your example, a user can directly run SQL code on your database by crafting statements in txtSalary.
For example, if they were to write 0 OR 1=1, the executed SQL would be
SELECT empSalary from employee where salary = 0 or 1=1
whereby all empSalaries would be returned.
Further, a u...
How to set the value to a cell in Google Sheets using Apps Script?
...answered Jul 4 '12 at 19:27
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