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Update MongoDB field using value of another field
...ion 4.2 also introduced the $set pipeline stage operator which is an alias for $addFields. I will use $set here as it maps with what we are trying to achieve.
db.collection.<update method>(
{},
[
{"$set": {"name": { "$concat": ["$firstName", " ", "$lastName"]}}}
]
)
Mon...
How to send a message to a particular client with socket.io
...,
message:[the message to be sent as string]
}
On the server, listen for messages. When a message is received, emit the data to the receiver.
users[data.to].emit('receivedMessage', data)
On the client, listen for emits from the server called 'receivedMessage', and by reading the data you ca...
FIND_IN_SET() vs IN()
I have 2 tables in my database. One is for orders, and one is for companies.
6 Answers
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What is the difference between CascadeType.REMOVE and orphanRemoval in JPA?
...een the two settings is in the response to
disconnecting a relationship. For example, such as when setting the
address field to null or to another Address object.
If orphanRemoval=true is specified the disconnected Address instance is automatically removed. This is useful for cleaning...
Clone private git repo with dockerfile
...otected which was causing the problem, a working file is now listed below (for help of future googlers)
FROM ubuntu
MAINTAINER Luke Crooks "luke@pumalo.org"
# Update aptitude with new repo
RUN apt-get update
# Install software
RUN apt-get install -y git
# Make ssh dir
RUN mkdir /root/.ssh/
# C...
How do I use variables in Oracle SQL Developer?
...
I am using the SQL-Developer in Version 3.2. The other stuff didn't work for me, but this did:
define value1 = 'sysdate'
SELECT &&value1 from dual;
Also it's the slickest way presented here, yet.
(If you omit the "define"-part you'll be prompted for that value)
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Using setImageDrawable dynamically to set image in an ImageView
...
Thanks a ton..i found it somewhere else bt still thanks for your Efforts.. :)
– Arun
Jan 4 '12 at 6:33
12
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How to do 3 table JOIN in UPDATE query?
... JOIN TABLE_C c ON [condition]
SET a.column_c = a.column_c + 1
EDIT:
For general Update join :
UPDATE TABLEA a
JOIN TABLEB b ON a.join_colA = b.join_colB
SET a.columnToUpdate = [something]
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Is it a bad practice to use negative margins in Android?
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In case you want use negative margin,set enough padding for container and its clipToPadding to false and set negative margin for it's children so it won't clip the child view!
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When to use next() and return next() in Node.js
...mes mistakes happens. When you write a lot of code, ifs/elses/etc. You may forget ```return next()`
– Jone Polvora
Jul 25 '19 at 16:45
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