大约有 30,000 项符合查询结果（耗时：0.0566秒） [XML]
Add a column to a table, if it does not already exist
...bjects.
IF NOT EXISTS (
SELECT *
FROM sys.columns
WHERE object_id = OBJECT_ID(N'[dbo].[Person]')
AND name = 'ColumnName'
)
share
|
improve this answer
|
...
How to use sessions in an ASP.NET MVC 4 application?
...s regular information across your application, to save additional database calls on each request, this data can be stored in an object and unserialised on each request, like so:
Our reusable, serializable object:
[Serializable]
public class UserProfileSessionData
{
public int UserId { get; set...
Passing arguments with spaces between (bash) script
...use $@ instead, so that someApp would receive two arguments if you were to call b.sh as
b.sh 'My first' 'My second'
With someApp "$*", someApp would receive a single argument My first My second. With someApp "$@", someApp would receive two arguments, My first and My second.
...
How to get thread id from a thread pool?
....currentThread():
private class MyTask implements Runnable {
public void run() {
long threadId = Thread.currentThread().getId();
logger.debug("Thread # " + threadId + " is doing this task");
}
}
sha...
PostgreSQL query to return results as a comma separated list
Let say you have a SELECT id from table query (the real case is a complex query) that does return you several results.
5 ...
What's the difference between size_t and int in C++?
...endly Wikipedia:
The stdlib.h and stddef.h header files define a datatype called size_t which is used to represent the size of an object. Library functions that take sizes expect them to be of type size_t, and the sizeof operator evaluates to size_t.
The actual type of size_t is platform-dependent;...
How to delete duplicate rows in SQL Server?
How can I delete duplicate rows where no unique row id exists?
23 Answers
23
...
UPDATE and REPLACE part of a string
I've got a table with two columns, ID and Value . I want to change a part of some strings in the second column.
9 Answer...
Rails Migration: Remove constraint
...
Not sure you can call t.address? Anyway... I would use change_column like so
change_column :users, :address, :string, :null => true
Docs...
http://apidock.com/rails/ActiveRecord/ConnectionAdapters/SchemaStatements/change_column
...
rspec 3 - stub a class method
...
@sixty4bit Is there a reason you can't call it with arguments?
– David Moles
Sep 3 '15 at 16:00
4
...