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Update MongoDB field using value of another field
...ion 4.2+ which allows using of aggregation pipeline in the update document and the updateOne, updateMany or update collection method. Note that the latter has been deprecated in most if not all languages drivers.
MongoDB 4.2+
Version 4.2 also introduced the $set pipeline stage operator which is an...
What is the difference between lock and Mutex?
What is the difference between lock and Mutex? Why can't they be used interchangeably?
7 Answers
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How to search a specific value in all tables (PostgreSQL)?
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+1 free and simple. And if you want structure pg_dump can do that too. Also if grep isn't your thing use what ever file content searching tool you want on the dumped out structures and/or data.
– Kuberchaun
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Do I have to Close() a SQLConnection before it gets disposed?
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Since you have a using block, the Dispose method of the SQLCommand will be called and it will close the connection:
// System.Data.SqlClient.SqlConnection.Dispose disassemble
protected override void Dispose(bool disposing)
{
if (disposing)
{
this._userConnectionOptions =...
Git Bash is extremely slow on Windows 7 x64
I've been using Git on both Windows and Ubuntu during the development of a small project, frequently flipping back and forth between the two. The issue is that Git Bash consistently becomes slow.
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Format number as fixed width, with leading zeros [duplicate]
...name_001" "name_026" "name_051" "name_076" "name_101"
Another is formatC and paste:
paste("name", formatC(a, width=3, flag="0"), sep="_")
[1] "name_001" "name_026" "name_051" "name_076" "name_101"
share
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SQLAlchemy IN clause
...w SQL mode with SQLAlchemy, I use SQLAlchemy 0.9.8, python 2.7, MySQL 5.X, and MySQL-Python as connector, in this case, a tuple is needed. My code listed below:
id_list = [1, 2, 3, 4, 5] # in most case we have an integer list or set
s = text('SELECT id, content FROM myTable WHERE id IN :id_list')
c...
Automatically import modules when entering the python or ipython interpreter
... documentation:
If this is the name of a readable file, the Python commands in that
file are executed before the first prompt is displayed in interactive
mode. The file is executed in the same namespace where interactive
commands are executed so that objects defined or imported in it can b...
Writing your own STL Container
...erator_tag,std::forward_iterator_tag,std::bidirectional_iterator_tag,std::random_access_iterator_tag. Also note that the below is technically more strict than required, but this is the idea. Note that the vast majority of the "standard" functions are technically optional, due to the awesomeness that...
How to find list intersection?
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If order is not important and you don't need to worry about duplicates then you can use set intersection:
>>> a = [1,2,3,4,5]
>>> b = [1,3,5,6]
>>> list(set(a) & set(b))
[1, 3, 5]
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