大约有 16,000 项符合查询结果（耗时：0.0336秒） [XML]
Python argparse mutual exclusive group
...y or args.fields):
print "-a and -q|-f are mutually exclusive ..."
sys.exit(2)
Of course, this little hack is only working for simple cases and it would become a nightmare to check all the possible options if you have many mutually exclusive options and groups. In that case you should brea...
What is the purpose of `text=auto` in `.gitattributes` file?
...he core.autocrlf configuration variable to determine if the file should be converted.
What does core.autocrlf do? From the docs:
core.autocrlf
Setting this variable to "true" is almost the same as setting the text attribute to "auto" on all files except that text files are not guarantee...
Convert a list of objects to an array of one of the object's properties
...
This should also work:
AggregateValues("hello", MyList.ConvertAll(c => c.Name).ToArray())
share
|
improve this answer
|
follow
|
...
Create a hexadecimal colour based on a string with JavaScript
....toUpperCase();
return "00000".substring(0, 6 - c.length) + c;
}
To convert you would do:
intToRGB(hashCode(your_string))
share
|
improve this answer
|
follow
...
SQL statement to select all rows from previous day
...
To get the "today" value in SQL:
convert(date, GETDATE())
To get "yesterday":
DATEADD(day, -1, convert(date, GETDATE()))
To get "today minus X days": change the -1 into -X.
So for all yesterday's rows, you get:
select * from tablename
where date &g...
Rails: fields_for with index?
...e = "#{object_name}[#{association_name}_attributes]"
association = convert_to_model(association)
if association.respond_to?(:persisted?)
association = [association] if @object.send(association_name).is_a?(Array)
elsif !association.respond_to?(:to_ary)
ass...
What is the “N+1 selects problem” in ORM (Object-Relational Mapping)?
...e queries are really fast, but it's the round trips that wreak havok. I've converted "WHERE Id = const" to "WHERE Id IN (const, const, ...)" and gotten orders of magnitude increases out of it.
– Hans
Oct 2 '12 at 23:07
...
Checking if a variable is an integer
...) rescue false This will not work for "1" if you want to check if it will convert
– mc.
Feb 18 '14 at 18:15
...
Unique fields that allow nulls in Django
... return value
if value is None:
# If db has NULL, convert it to ''.
return ''
# Otherwise, just return the value.
return value
def get_prep_value(self, value):
"""
Catches value right before sending to db.
"""
...
Java FileReader encoding issue
I tried to use java.io.FileReader to read some text files and convert them into a string, but I found the result is wrongly encoded and not readable at all.
...