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how to emulate “insert ignore” and “on duplicate key update” (sql merge) with postgresql?
Some SQL servers have a feature where INSERT is skipped if it would violate a primary/unique key constraint. For instance, MySQL has INSERT IGNORE .
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How to check if an element is in an array
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edited May 22 '19 at 7:55
Sazzad Hissain Khan
25.8k1515 gold badges106106 silver badges153153 bronze badges
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Visual Studio window which shows list of methods
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There's a drop down just above the code window:
It's called Navigation bar and contains three drop downs: first drop down contains project, second type and third members (methods).
You can use the shortcut Ctrl + F2 (move focus to the project drop down) and press Tab twic...
Output to the same line overwriting previous output?
I am writing an FTP downloader. Part of to the code is something like this:
8 Answers
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How to make an unaware datetime timezone aware in python
...tz.utc.localize(unaware)
assert aware == now_aware
For the UTC timezone, it is not really necessary to use localize since there is no daylight savings time calculation to handle:
now_aware = unaware.replace(tzinfo=pytz.UTC)
works. (.replace returns a new datetime; it does not modify unaware.)
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How do I rename a column in a SQLite database table?
I would need to rename a few columns in some tables in a SQLite database.
I know that a similar question has been asked on stackoverflow previously, but it was for SQL in general, and the case of SQLite was not mentioned.
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How can I generate random alphanumeric strings?
...ength)]).ToArray());
}
(Note: The use of the Random class makes this unsuitable for anything security related, such as creating passwords or tokens. Use the RNGCryptoServiceProvider class if you need a strong random number generator.)
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Why are properties without a setter not serialized
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It's a limitation of XmlSerializer it doesn't serialize read-only properties, what you have done in your second example is essentially the hack to get it to serialize, however, it's useless if you need it to deserialize later...
Get index of element as child relative to parent
...x() );
});
However rather than attaching one click handler for each list item it is better (performance wise) to use delegate which would look like this:
$("#wizard").delegate('li', 'click', function () {
console.log( $(this).index() );
});
In jQuery 1.7+, you should use on. The below examp...
Browse the files created on a device by the iOS application I'm developing, on workstation?
I'm developing an IOS app that creates files on the device, e.g. with NSKeyedArchiver .
6 Answers
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