大约有 40,000 项符合查询结果（耗时：0.0389秒） [XML]
What is “stdafx.h” used for in Visual Studio?
...
All C++ compilers have one serious performance problem to deal with. Compiling C++ code is a long, slow process.
Compiling headers included on top of C++ files is a very long, slow process. Compiling the huge header structures that ...
What is the most efficient way to store tags in a database?
...implies to me that you'll quite possibly need an intermediary table to overcome the many-to-many obstacle.
Something like:
Table: Items
Columns: Item_ID, Item_Title, Content
Table: Tags
Columns: Tag_ID, Tag_Title
Table: Items_Tags
Columns: Item_ID, Tag_ID
It might be that your web app is very ...
Rails: Check output of path helper from console
...
Just in a follow up of my own comment, seems this is possible from rails 3 console, in case you're using. First, stick a fake request into your app object, by calling something like app.get "/" then just instance_eval the wanted methods, as they are no...
How to convert a ruby hash object to JSON?
... edited May 23 '17 at 12:34
Community♦
111 silver badge
answered Jul 6 '10 at 6:40
Mladen JablanovićMla...
What is the relationship between the docker host OS and the container base image OS?
...
Docker is a pretty complex project that leverage advance features. At some point, we assume the user has some knowledge like the difference between operating system and distribution. If you think it would add value, the documentation is open so...
How to make an element in XML schema optional?
...
add a comment
|
20
...
@Basic(optional = false) vs @Column(nullable = false) in JPA
...
Gordon Yorke (EclipseLink Architecture Committee Member, TopLink Core Technical Lead, JPA 2.0 Expert Group Member) wrote a good answer on this topic so instead of paraphrasing him, I'll quote his answer:
The difference between optional and
nullable is the sc...
TypeError: Cannot read property 'then' of undefined
...
add a comment
|
2
...
Differences between Intent and PendingIntent
...An Android Intent is an object carrying an intent, i.e. a message from one component to another component either inside or outside of the application. Intents can communicate messages among any of the three core components of an application -- Activities, Services, and BroadcastReceivers.
The inten...