大约有 44,000 项符合查询结果（耗时：0.0401秒） [XML]
Query EC2 tags from within instance
...ol (to retrieve your instance ID) and the new Tag API to retrieve the tags for the current instance.
share
|
improve this answer
|
follow
|
...
What is the meaning of id?
... to any type, but unlike void * it always points to an Objective-C object. For example, you can add anything of type id to an NSArray, but those objects must respond to retain and release.
The compiler is totally happy for you to implicitly cast any object to id, and for you to cast id to any objec...
How to implement the activity stream in a social network
...ound on the web examples of implementation the stream of users' actions... For example, how to filter actions for each users? How to store the action events? Which data model and object model can I use for the actions stream and for the actions itselves?
...
How to get the data-id attribute?
...data-id attribute? I'm using the .on() method to re-bind the click event for sorted items.
15 Answers
...
How do I drop a foreign key constraint only if it exists in sql server?
...r. However, it will find constraints on any table. If you want to target a foreign key constraint on a specific table, use this:
IF EXISTS (SELECT *
FROM sys.foreign_keys
WHERE object_id = OBJECT_ID(N'dbo.FK_TableName_TableName2')
AND parent_object_id = OBJECT_ID(N'dbo.TableName')
)
ALT...
Mapping many-to-many association table with extra column(s)
... the best way (I always prefer to map the thing owning the FK as an entity for performance reasons), it is not in fact the only way. You can also map the values from the SERVICE_USER table as a component (what JPA calls an embeddable) and use an @ElementCollection from either (or both) the User and...
How to use GROUP BY to concatenate strings in SQL Server?
...LE loop, or User-Defined Function needed.
Just need to be creative with FOR XML and PATH.
[Note: This solution only works on SQL 2005 and later. Original question didn't specify the version in use.]
CREATE TABLE #YourTable ([ID] INT, [Name] CHAR(1), [Value] INT)
INSERT INTO #YourTable ([ID],[N...
jquery IDs with spaces
...rrible HTML via ajax and have no control over the structure of the HTML or format of the IDs. Their IDs have spaces in them, so Elliot's answer helps tremendously, whereas glavic's offers no help at all.
– daybreaker
Jun 27 '11 at 18:59
...
When to add what indexes in a table in Rails
...
Should I add "index" to all the foreign keys like "xxx_id"?
It would be better, because it accelerates the search in sorting in this column. And Foreign keys are something searched for a lot.
Since Version 5 of rails the index will be created automatical...
How to check if a Constraint exists in Sql server?
...
try this:
SELECT
*
FROM INFORMATION_SCHEMA.REFERENTIAL_CONSTRAINTS
WHERE CONSTRAINT_NAME ='FK_ChannelPlayerSkins_Channels'
-- EDIT --
When I originally answered this question, I was thinking "Foreign Key" because the original question asked ab...