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What is the best way to clear a session variable in rails?
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237
session.delete(:message)
In general, session variable is SessionHash object, which is inherite...
PostgreSQL delete with inner join
...SING m_product C
WHERE B.m_product_id = C.m_product_id AND
C.upc = '7094' AND
B.m_pricelist_version_id='1000020';
or
DELETE
FROM m_productprice
WHERE m_pricelist_version_id='1000020' AND
m_product_id IN (SELECT m_product_id
FROM m_prod...
Converting a column within pandas dataframe from int to string
... [16]: df = DataFrame(np.arange(10).reshape(5,2),columns=list('AB'))
In [17]: df
Out[17]:
A B
0 0 1
1 2 3
2 4 5
3 6 7
4 8 9
In [18]: df.dtypes
Out[18]:
A int64
B int64
dtype: object
Convert a series
In [19]: df['A'].apply(str)
Out[19]:
0 0
1 2
2 4
3 6
4 8...
Will writeToFile:atomically: overwrite data?
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BJ HomerBJ Homer
47.3k99 gold badges109109 silver badges127127 bronze badges
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generating GUID without hyphen
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278
Note that you are talking about the (canonical) string representation of a Guid. The Guid itsel...
How to convert timestamp to datetime in MySQL?
...nRichard Tuin
4,09322 gold badges1616 silver badges1717 bronze badges
1
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Should JAVA_HOME point to JDK or JRE?
I pointed the JAVA_HOME to C:\Program Files (x86)\Java\jre7 . It works fine. Afterwards, I unzipped ant and set up the environment variables related to Ant, I got the following error messages after typing "ant -version"
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Printing newlines with print() in R
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answered Nov 1 '10 at 19:07
Gavin SimpsonGavin Simpson
152k2424 gold badges354354 silver badges415415 bronze badges
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Visual studio long compilation when replacing int with double
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I repro, 27 seconds on my machine. The evil-doer is MsMpEng.exe, it burns 100% core for that long. Easy to see in Task Manager's Processes tab.
This is the Windows Defender service, the one that actually performs the malware scans. ...
How do I make a transparent canvas in html5?
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Lee Taylor
5,93777 gold badges2626 silver badges4343 bronze badges
answered Jan 27 '11 at 10:35
OmiodOmiod
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