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How to add external library in IntelliJ IDEA?
I am trying to add external library (places it in the /libs directory) to my project. When I try to use the methods from that library, I see that they are in red color which means that the library is not recognized. When I click Ctrl+B, I get a message "Cannot find declaration to go to".
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Writing a Python list of lists to a csv file
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Python's built-in CSV module can handle this easily:
import csv
with open("output.csv", "wb") as f:
writer = csv.writer(f)
writer.writerows(a)
This assumes your list is defined as a, as it is in your question. You can twea...
How to convert a String into an ArrayList?
In my String, I can have an arbitrary number of words which are comma separated. I wanted each word added into an ArrayList. E.g.:
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What is the proper way to check for existence of variable in an EJS template (using ExpressJS)?
On the EJS github page, there is one and only one simple example:
https://github.com/visionmedia/ejs
13 Answers
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How to convert a char to a String?
... string concatenation works as a shortcut as well:
String s = "" + 's';
But this compiles down to:
String s = new StringBuilder().append("").append('s').toString();
which is less efficient because the StringBuilder is backed by a char[] (over-allocated by StringBuilder() to 16), only for that ...
Tomcat startup logs - SEVERE: Error filterStart how to get a stack trace?
...ypically store that type of info. I wouldn't expect the full stacktrace to be dumped to standard out.
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When should I use a composite index?
For example, I have a homes table:
9 Answers
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How can I get column names from a table in Oracle?
I need to query the database to get the column names , not to be confused with data in the table. For example, if I have a table named EVENT_LOG that contains eventID , eventType , eventDesc , and eventTime , then I would want to retrieve those field names from the query and nothing else.
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git diff two files on same branch, same commit
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You don't need git for that, just use diff fileA.php fileB.php (or vimdiff if you want side by side comparison)
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MySQL Cannot Add Foreign Key Constraint
So I'm trying to add Foreign Key constraints to my database as a project requirement and it worked the first time or two on different tables, but I have two tables on which I get an error when trying to add the Foreign Key Constraints.
The error message that I get is:
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