大约有 44,000 项符合查询结果（耗时：0.0495秒） [XML]
Entity Framework. Delete all rows in table
...
For those that are googling this and ended up here like me, this is how you currently do it in EF5 and EF6:
context.Database.ExecuteSqlCommand("TRUNCATE TABLE [TableName]");
Assuming context is a System.Data.Entity.DbConte...
Finding ALL duplicate rows, including “elements with smaller subscripts”
...uplicated(vec, fromLast=TRUE)]
## [1] "c" "c" "c"
Edit: And an example for the case of a data frame:
df <- data.frame(rbind(c("a","a"),c("b","b"),c("c","c"),c("c","c")))
df[duplicated(df) | duplicated(df, fromLast=TRUE), ]
## X1 X2
## 3 c c
## 4 c c
...
Rails create or update magic?
...ord callbacks or validations.
Rails 5, 4, and 3
Not if you are looking for an "upsert" (where the database executes an update or an insert statement in the same operation) type of statement. Out of the box, Rails and ActiveRecord have no such feature. You can use the upsert gem, however.
Otherw...
PHPUnit assert that an exception was thrown?
... $this->expectException(InvalidArgumentException::class);
// or for PHPUnit < 5.2
// $this->setExpectedException(InvalidArgumentException::class);
//...and then add your test code that generates the exception
exampleMethod($anInvalidArgument);
}
}
exp...
How can I select from list of values in SQL Server
...
For performance reasons, I'd recommend Union-All, then Group-By or use Distinct in your outer select.
– MikeTeeVee
May 12 '14 at 20:39
...
JavaScript post request like a form submit
...
Dynamically create <input>s in a form and submit it
/**
* sends a request to the specified url from a form. this will change the window location.
* @param {string} path the path to send the post request to
* @param {object} params the paramiters to add t...
How to change a Git remote on Heroku
...[app name] -r [remote]
EDIT: thanks to Алексей Володько For pointing it out that there's no need to delete the old remote.
share
|
improve this answer
|
fo...
Plot correlation matrix into a graph
...the ballpark:
library(lattice)
#Build the horizontal and vertical axis information
hor <- c("214", "215", "216", "224", "211", "212", "213", "223", "226", "225")
ver <- paste("DM1-", hor, sep="")
#Build the fake correlation matrix
nrowcol <- length(ver)
cor <- matrix(runif(nrowcol*nro...
Can someone explain the HTML5 aria-* attribute?
I wanted to know what the aria-* attributes are used for. What values can they have, and are they defined values or can I create my own values?
...
Resizing UITableView to fit content
...
Actually I found the answer myself.
I just create a new CGRect for the tableView.frame with the height of table.contentSize.height
That sets the height of the UITableView to the height of its content.
Since the code modifies the UI, do not forget to run it in the main thread:
dispatch_...