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How can I list all collections in the MongoDB shell?
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> show collections
will list all the collections in the currently selected DB, as stated in the command line help (help).
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How stable is the git plugin for eclipse?
...clipse incubation. You can install it using the Eclipse update manager.
Select Help -> Install New Software...
You probably do not have the JGit update URL in your list of sites so in the 'Work with:' field enter this url: http://www.jgit.org/updates
Click Add...
You should now see Eclipse Git...
How do I delete everything in Redis?
...eteDataFromDB(Jedis jedis, String keyPattern, int dbIndex) {
jedis.select(dbIndex);
Set<String> keys = jedis.keys(keyPattern);
for(String key : keys){
jedis.del(key);
System.out.println("The key: " + key + " has been deleted from database index: ...
Return first N key:value pairs from dict
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This one is a better solution if you want to select N many key:value pairs as a dictionary, not as a list
– fermat4214
Mar 15 '17 at 11:25
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How to combine multiple conditions to subset a data-frame using “OR”?
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filter(df, v1 < 0.5 | v2 == "g")
Using sqldf:
library(sqldf)
sqldf('SELECT *
FROM df
WHERE v1 < 0.5 OR v2 = "g"')
Output for the above options:
v1 v2
1 0.26550866 a
2 0.37212390 b
3 0.20168193 e
4 0.94467527 g
5 0.06178627 j
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Tools to generate database tables diagram with Postgresql? [closed]
...rse engineer") an existing DB schema (via JDBC) and make a diagram of some selected tables.
Recursively add files by pattern
...king your files and have made changes to them and now you want to add them selectively based on a pattern, you can use the --modified flag
git ls-files --modified | grep '<pattern>' | xargs git add
For example, if you only want to add the CSS changes to this commit, you can do
git ls-files...
CreateProcess error=206, The filename or extension is too long when running main() method
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In intellij there is an option to 'shorten command line', select 'JAR manifest' or '@argFiles' would solve the problem, basically it will put your lengthy class path into a jar file or a temp file
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See all breakpoints in Visual Studio 2010+
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In Visual Studio 2017, Ctrl+D duplicates the current selection and Ctrl+B adds a new breakpoint at the current line. Ctrl+F9 does nothing.
– Malcolm
May 7 '19 at 16:16
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How to delete a character from a string using Python
...examples for both of the two major uses cases, separated by their position selection method.
– Alexander Stohr
Mar 17 at 15:29
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