大约有 36,010 项符合查询结果（耗时：0.0346秒） [XML]
Schema for a multilanguage database
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What do you think about having a related translation table for each translatable table?
CREATE TABLE T_PRODUCT (pr_id int, PRICE NUMBER(18, 2))
CREATE TABLE T_PRODUCT_tr (pr_id INT FK, languagecode varchar, pr_name text, pr_descr...
data.table vs dplyr: can one do something well the other can't or does poorly?
... the moment allows one to modify/update columns by reference (note that we don't need to re-assign the result back to a variable).
# sub-assign by reference, updates 'y' in-place
DT[x >= 1L, y := NA]
But dplyr will never update by reference. The dplyr equivalent would be (note that the result ...
Initializing multiple variables to the same value in Java
...ree;
one = two = three = "";
This should work with immutable objects. It doesn't make any sense for mutable objects for example:
Person firstPerson, secondPerson, thirdPerson;
firstPerson = secondPerson = thirdPerson = new Person();
All the variables would be pointing to the same instance. Prob...
How do I convert a Django QuerySet into list of dicts?
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this doesn't actually return a list though
– astreltsov
Jan 25 '17 at 3:26
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Calling remove in foreach loop in Java [duplicate]
...tring s = i.next(); // must be called before you can call i.remove()
// Do something
i.remove();
}
From the Java Documentation :
The iterators returned by this class's iterator and listIterator
methods are fail-fast: if the list is structurally modified at any
time after the iterator...
Output array to CSV in Ruby
...nough to read a CSV file into an array with Ruby but I can't find any good documentation on how to write an array into a CSV file. Can anyone tell me how to do this?
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Vim clear last search highlighting
After doing a search in Vim, I get all the occurrences highlighted. How can I disable that? I now do another search for something gibberish that can't be found.
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How do I get the color from a hexadecimal color code using .NET?
...t's an ARGB code... Are you referring to System.Drawing.Color or System.Windows.Media.Color? The latter is used in WPF for example. I haven't seen anyone mention it yet, so just in case you were looking for it:
using System.Windows.Media;
Color color = (Color)ColorConverter.ConvertFromString("#FFD...
How do I map lists of nested objects with Dapper
...
Dapper is not a full blown ORM it does not handle magic generation of queries and such.
For your particular example the following would probably work:
Grab the courses:
var courses = cnn.Query<Course>("select * from Courses where Category = 1 Order ...
In Bash, how to add “Are you sure [Y/n]” to any command or alias?
...sure? [y/N] " response
case "$response" in
[yY][eE][sS]|[yY])
do_something
;;
*)
do_something_else
;;
esac
Or, for Bash >= version 3.2:
read -r -p "Are you sure? [y/N] " response
if [[ "$response" =~ ^([yY][eE][sS]|[yY])$ ]]
then
do_something
else
...