大约有 32,000 项符合查询结果（耗时：0.0414秒） [XML]
Can someone explain mappedBy in JPA and Hibernate?
...contain foreign key constraint. if mapped by can be applied on both side then it remove foreign key from both table and without foreign key there is no relation b/w two tables.
Note:- it can be use for following annotations:-
1.@OneTone
2.@OneToMany
3.@ManyToMany
Note---It cannot be use for f...
Long-lasting FB access-token for server to pull FB page info
...account is also unfortunate, because if the user updates his/her password, then the page token also gets invalidated.
How to do it in 2019
After several hours of research, I stumbled upon the following Facebook documentation article: Business Login for Direct Businesses.
It turns out that it is n...
Why doesn't margin:auto center an image?
...use a relative size, like "width:50%". Of course, if you use "width:100%" then centering is not an issue, because there is then no margin on the left or right of the object.
– Catwoman
Oct 28 '15 at 23:01
...
Toggle Checkboxes on/off
...ases the status off of the first one (so if the user checks the first one, then uses the toggle, they'll get out of sync). Slightly tweaked so it bases the status off of the toggle, not the first checkbox in the list: $("input[name=recipients\[\]]").prop("checked", $(this).prop("checked"));
...
How to keep the console window open in Visual C++?
...YSTEM:CONSOLE)"
Click Apply, wait for it to finish doing whatever it does, then click OK. (If "Apply" is grayed out, choose some other subsystem option, click Apply, then go back and apply the console option. My experience is that OK by itself won't work.)
CTRL-F5 and the subsystem hints work toge...
MySQL foreign key constraints, cascade delete
...etes nuke a product because it was a member of a category that was killed, then you've set up your foreign keys improperly. Given your example tables, you should have the following table setup:
CREATE TABLE categories (
id int unsigned not null primary key,
name VARCHAR(255) default null
)E...
Releasing memory in Python
...'t happen unless you're deallocating the last thing in the block, and even then, it may not happen.)
If you do deallocate a block of object storage, to know whether this causes a free call, you have to know the internal state of the PyMem allocator, as well as how it's implemented. (Again, you have...
Can you explain the concept of streams?
...@user137717: No, if you just take a StreamReader - or better, a TextReader then your code doesn't know what kind of stream underlies the data flow. Or rather, it can use the BaseStream property to find out the type - but it may be a type that your code has never seen before. The point is that you sh...
UnicodeDecodeError: 'ascii' codec can't decode byte 0xef in position 1
...nal the example works with the above, but if I get rid of the LANG setting then it won't work
$ unset LANG
$ python
Python 2.7.3 (default, Apr 20 2012, 22:39:59)
[GCC 4.6.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> s = '(\xef\xbd\xa1\xef\xbd\xa5...
How do I copy SQL Azure database to my local development server?
...also very simple. First transfer data using SSIS (see instructions below), then create DB Create script from SQL Azure database, and re-play it on your local database.
Finally, you can use Import/Export service in SQL Azure. This transfers data (with a schema objects) to Azure Blob Storage as a BAC...