大约有 40,000 项符合查询结果（耗时：0.0545秒） [XML]
Undo changes in entity framework entities
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Query ChangeTracker of DbContext for dirty items. Set deleted items state to unchanged and added items to detached. For modified items, use original values and set current values of the entry. Finally set state of modified entry to unchanged:
public void RollBack()
{
va...
Split comma-separated strings in a column into separate rows
...ed=TRUE),
by = .(AB, director)][, director := NULL][
, setnames(.SD, "V1", "director")]},
DT4 = {
DT[, .(director = unlist(strsplit(as.character(director), ",", fixed = TRUE))),
by = .(AB)]},
times = mb_times
)
}
Run benchmark for different problem siz...
How do you do a deep copy of an object in .NET? [duplicate]
...ject;
clonedArray.ForEach((array, indices) => array.SetValue(InternalCopy(clonedArray.GetValue(indices), visited), indices));
}
}
visited.Add(originalObject, cloneObject);
CopyFields(originalObject, visited, cloneObject, typ...
Running shell command and capturing the output
...t;> out, err = p.communicate()
>>> print out
.
..
foo
If you set stdin=PIPE, communicate also allows you to pass data to the process via stdin:
>>> cmd = ['awk', 'length($0) > 5']
>>> p = subprocess.Popen(cmd, stdout=subprocess.PIPE,
... ...
How can Perl's print add a newline by default?
...n a handle, only as a static method.
See IO::Handle.
Mnemonic: you set $\ instead of adding "\n" at the end of the print. Also, it's
just like $/ , but it's what you get "back" from Perl.
example:
$\ = "\n";
print "a newline will be appended to the end of this line automatically";
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Git 工具 - 子模块(submodule)：一个仓库包含另一个仓库 - 开源 & Github -...
...with 'origin/master'.
Changes to be committed:
(use "git reset HEAD <file>..." to unstage)
new file: .gitmodules
new file: DbConnector
首先应当注意到新的 .gitmodules 文件。 该配置文件保存了项目 URL 与已经拉取的本地目录之间的映射：
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Sample random rows in dataframe
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Remember to set your seed (e.g. set.seed(42) ) every time you want to reproduce that specific sample.
– CousinCocaine
Apr 10 '14 at 8:47
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Read specific columns from a csv file with csv module?
I'm trying to parse through a csv file and extract the data from only specific columns.
11 Answers
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Multiple cases in switch statement
... User could use some if's (or a table lookup) to reduce the input to a set of enums and switch on the enum.
– Harvey
Jul 28 '13 at 20:00
5
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How To Set Up GUI On Amazon EC2 Ubuntu server
... Ubuntu EC2 instance which is only has a command line interface. I want to setup UI for that server to access using remote desktop tools. Is there any way to apply GUI to the EC2 instance?
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