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psycopg2: insert multiple rows with one query
...)
Printing the insert_query outputs
insert into t (a, b) values %s,%s
Now to the usual Psycopg arguments substitution
cursor.execute(insert_query, data)
Or just testing what will be sent to the server
print (cursor.mogrify(insert_query, data).decode('utf8'))
Output:
insert into t (a, b) ...
C++ code file extension? .cc vs .cpp [closed]
... Why is this the accepted answer? A newer programmer will not know that it does not matter and they deserve a straightforward answer.
– Robben_Ford_Fan_boy
Jul 19 '16 at 15:37
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Open firewall port on CentOS 7
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The answer by ganeshragav is correct, but
it is also useful to know that you can use:
firewall-cmd --permanent --zone=public --add-port=2888/tcp
but if is a known service, you can use:
firewall-cmd --permanent --zone=public --add-service=http
and then reload the firewall
firewall...
How to call a Python function from Node.js
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Easiest way I know of is to use "child_process" package which comes packaged with node.
Then you can do something like:
const spawn = require("child_process").spawn;
const pythonProcess = spawn('python',["path/to/script.py", arg1, arg2, ....
What is a singleton in C#?
...plementing the Singleton Pattern in C#" covering most of what you need to know - including some good advice regarding thread safety.
To be honest, It's very rare that you need to implement a singleton - in my opinion it should be one of those things you should be aware of, even if it's not used too...
Why would adding a method add an ambiguous call, if it wouldn't be involved in the ambiguity
...However, I do not understand these parts of the spec thoroughly enough to know which parts of the spec control this behavior, let alone to judge whether it is compliant.
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Difference between this and self in self-type annotations?
...aking a certain type and returning the code block e.g. foo: B => {...}. Now those curlies are of course omitted. It is interesting to see that you can use the object name instead of "this" inside any scope in the code though [something we do all the time in javascript]
– Ust...
Function to Calculate Median in SQL Server
... try to test a solution out with real data on real hardware – you never know when a change to SQL Server's optimizer or a peculiarity in your environment will make a normally-speedy solution slower.
SELECT
CustomerId,
AVG(TotalDue)
FROM
(
SELECT
CustomerId,
TotalDue,
--...
Is there a way to iterate over a dictionary?
I know NSDictionaries as something where you need a key in order to get a value . But how can I iterate over all keys and values in a NSDictionary , so that I know what keys there are, and what values there are? I know there is something called a for-in-loop in JavaScript . Is there som...
@Override is not allowed when implementing interface method
... this that is using version 2016.2.4 or higher, the menu has changed, it's now Project Structure > Modules > xxx > Language level
– Wesley Smith
Sep 20 '16 at 4:16
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