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How do you copy a record in a SQL table but swap out the unique id of the new row?
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Any fields not specified should receive their default value (which is usually NULL when not defined).
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How do I delete everything in Redis?
I want to delete all keys. I want everything wiped out and give me a blank database.
22 Answers
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Eclipse comment/uncomment shortcut?
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Use
Ctrl + SHIFT + L which will open a list of all major shortcuts for eclipse.
For single line java code comment and uncomment : Ctrl + / (Forward
Slash)
For multiple line java code comment : Ctrl + Shift +
/ (Forward Slash) and
Multiline uncomment : Ctrl + Shift +
\ ...
How to round up the result of integer division?
...ause it only uses it once, you don't need to store the recordsPerPage specially if it comes from an expensive function to fetch the value from a config file or something.
I.e. this might be inefficient, if config.fetch_value used a database lookup or something:
int pageCount = (records + config.f...
How do you merge two Git repositories?
...hub.com/rails/rails.git master
This will appear as a single commit where all files of Rails master branch are added into "rails" directory.
However the commit's title contains a reference to the old history tree:
Add 'rails/' from commit <rev>
Where <rev> is a SHA-1 commit hash. ...
Limit Decimal Places in Android EditText
...sor to the front most of the text". I wish to produce text 12.45, it won't allow.
– Cheok Yan Cheng
Sep 28 '12 at 1:53
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Add only non-whitespace changes
I have my text editor to automatically trim trailing whitespace upon saving a file, and I am contributing to an open source project that has severe problems with trailing whitespace.
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Make Adobe fonts work with CSS3 @font-face in IE9
I'm in the process of building a small intranet application and try, with no luck, to use Adobe font I purchased lately. As I was informed, in our case it's not a license violation.
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“using namespace” in c++ headers
In all our c++ courses, all the teachers always put using namespace std; right after the #include s in their .h files. This seems to me to be dangerous since then by including that header in another program I will get the namespace imported into my program, maybe without realizing, intending or...
React JSX: selecting “selected” on selected option
...ect>
For more info, see the React select tag doc.
Also, React automatically understands booleans for this purpose, so you can simply write (note: not recommended)
<option value={option.value} selected={optionsState == option.value}>{option.label}</option>
and it will output 'selecte...