大约有 12,000 项符合查询结果（耗时：0.0264秒） [XML]
When do I need to use Begin / End Blocks and the Go keyword in SQL Server?
...eating a database and then querying it. You can't write:
CREATE DATABASE foo;
USE foo;
CREATE TABLE bar;
because foo does not exist for the batch which does the CREATE TABLE. You'd need to do this:
CREATE DATABASE foo;
GO
USE foo;
CREATE TABLE bar;
...
Understanding the meaning of the term and the concept - RAII (Resource Acquisition is Initialization
...ary objects:
void CopyFileData(FileHandle source, FileHandle dest);
void Foo()
{
CopyFileData(FileHandle("C:\\source"), FileHandle("C:\\dest"));
}
There are three error cases to handled: no file can be opened, only one file can be opened, both files can be opened but copying the files failed...
How to secure MongoDB with username and password
...uthenticate as the user.
use some_db
db.auth("myNormalUser", "xyz123")
db.foo.insert({x:1})
use some_other_db
db.foo.find({})
Long answer: Read this if you want to properly understand.
It's really simple. I'll dumb the following down https://docs.mongodb.com/manual/tutorial/enable-authentication...
How to concatenate strings in twig
...ou have to create a variable to hold the concatenated string. E.g.: {% set foo = 'http://' ~ app.request.host %}. And then you can do: {{ foo | trans }}.
– Alessandro Desantis
Jan 8 '12 at 17:58
...
Tools for making latex tables in R [closed]
... mat <- xtable(cleandata,digits=rep(2,ncol(cleandata)+1))
foo<-0:(length(mat$animal))
bar<-foo[!is.na(mat$animal)]
print(mat,
sanitize.text.function = function(x){x},
floating=FALSE,
include.rowname...
Mocking Extension Methods with Moq
...cking normal method. Consider the following
public static string Echo(this Foo foo, string strValue)
{
return strValue;
}
To arrange and verify this method use the following:
string expected = "World";
var foo = new Foo();
Mock.Arrange(() => foo.Echo(Arg.IsAny<string>())).Returns(e...
Java: how to initialize String[]?
...
String[] errorSoon = { "foo", "bar" };
-- or --
String[] errorSoon = new String[2];
errorSoon[0] = "foo";
errorSoon[1] = "bar";
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improve...
What does template mean?
...
// Factorial<4>::value == 24
// Factorial<0>::value == 1
void foo()
{
int x = Factorial<4>::value; // == 24
int y = Factorial<0>::value; // == 1
}
share
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improve t...
Speed up the loop operation in R
...row(x)
}
}
system.time({
d=data.frame(seq=1:10000,r=rnorm(10000))
d$foo=d$r
d$seq=1:5
mark=NA
for(i in 1:nrow(d)){
if(d$seq[i]==1) mark=d$r[i]
d$foo[i]=mark
}
})
system.time({
d=data.frame(seq=1:10000,r=rnorm(10000))
d$foo=d$r
d$seq=1:5
d=as.list(d) #become a list
m...
Select elements by attribute in CSS
...
[data-value] {
/* Attribute exists */
}
[data-value="foo"] {
/* Attribute has this exact value */
}
[data-value*="foo"] {
/* Attribute value contains this value somewhere in it */
}
[data-value~="foo"] {
/* Attribute has this value in a space-separated list somewhere */...