大约有 30,000 项符合查询结果（耗时：0.0602秒） [XML]
How do I find a default constraint using INFORMATION_SCHEMA?
...l_columns
INNER JOIN
sys.tables
ON all_columns.object_id = tables.object_id
INNER JOIN
sys.schemas
ON tables.schema_id = schemas.schema_id
INNER JOIN
sys.default_constraints
ON all_columns.default_object_id = default_constraints.object_...
Android: how to draw a border to a LinearLayout
...
Do you really need to do that programmatically?
Just considering the title: You could use a ShapeDrawable as android:background…
For example, let's define res/drawable/my_custom_background.xml as:
<shape xmlns:android="http://schemas.android.com/apk/res/andr...
Alternatives to java.lang.reflect.Proxy for creating proxies of abstract classes (rather than interf
...hat you can do in such a case is having a proxy handler that will redirect calls to existing methods of your abstract class.
You of course will have to code it, however it's quite simple. For creating your Proxy, you'll have to give him an InvocationHandler. You'll then only have to check the metho...
Clustered vs Non-Clustered
... applying the clustered index to PersonId means that the rows will be physically sorted by PersonId in the table, allowing an index search on this to go straight to the row (rather than a non-clustered index, which would direct you to the row's location, adding an extra step).
That said, it's unusu...
what is the right way to treat Python argparse.Namespace() as a dictionary?
... dictionary proxies), the rest of the cases are updateable. The vars(obj) call is synonymous with obj.__dict__. In the case of an argparse namespace, vars(args) gives direct access to an updateable dictionary.
– Raymond Hettinger
Jun 2 '13 at 0:04
...
Why does the C++ map type argument require an empty constructor when using []?
... Why is that std::<map>::value_type there in the insert call?
– thomthom
May 6 '15 at 11:53
...
datetime dtypes in pandas read_csv
...way of solving this
The pandas.read_csv() function has a keyword argument called parse_dates
Using this you can on the fly convert strings, floats or integers into datetimes using the default date_parser (dateutil.parser.parser)
headers = ['col1', 'col2', 'col3', 'col4']
dtypes = {'col1': 'str', ...
Logical operators for boolean indexing in Pandas
... guess, and instead raise a ValueError.
Instead, you must be explicit, by calling the empty(), all() or any() method to indicate which behavior you desire.
In this case, however, it looks like you do not want boolean evaluation, you want element-wise logical-and. That is what the & binary oper...
Defining a percentage width for a LinearLayout? [duplicate]
I want to define a percentage width (70%) for a LinearLayout that contains some buttons, so that I can center it and so that the child buttons can fill_parent. Here's a picture showing what I mean:
...
How do you clear the focus in javascript?
...
You can call window.focus();
but moving or losing the focus is bound to interfere with anyone using the tab key to get around the page.
you could listen for keycode 13, and forego the effect if the tab key is pressed.
...