大约有 47,000 项符合查询结果（耗时：0.0585秒） [XML]
How to map a composite key with JPA and Hibernate?
...y the specification also applies. So here they are:
2.1.4 Primary Keys and Entity Identity
...
A composite primary key must
correspond to either a single
persistent field or property or to a
set of such fields or properties as
described below. A primary key class
must be defi...
Streaming via RTSP or RTP in HTML5
...er.com/path/to/stream">
Your browser does not support the VIDEO tag and/or RTP streams.
</video>
or maybe
<video src="http://myserver.com:1935/path/to/stream/myPlaylist.m3u8">
Your browser does not support the VIDEO tag and/or RTP streams.
</video>
That said, the imple...
erb, haml or slim: which one do you suggest? And why? [closed]
I am learning Rails and I have seen these template engines. I have no experience with them (only erb).
5 Answers
...
Refresh image with a new one at the same url
...ppend the current timestamp automatically when you are creating the image, and it will make the browser look again for the image instead of retrieving the one in the cache.
share
|
improve this answ...
Message Queue vs. Web Services? [closed]
...
When you use a web service you have a client and a server:
If the server fails the client must take responsibility to handle the error.
When the server is working again the client is responsible of resending it.
If the server gives a response to the call and the clien...
Rails 4 LIKE query - ActiveRecord adds quotes
...
Your placeholder is replaced by a string and you're not handling it right.
Replace
"name LIKE '%?%' OR postal_code LIKE '%?%'", search, search
with
"name LIKE ? OR postal_code LIKE ?", "%#{search}%", "%#{search}%"
...
Insert Update trigger how to determine if insert or update
...ble A's column (say Col1). How would I go around writing it so that I can handle both Update and Insert cases. How would I determine if the trigger is executed for an update or insert.
...
Find the max of two or more columns with pandas
...
You can get the maximum like this:
>>> import pandas as pd
>>> df = pd.DataFrame({"A": [1,2,3], "B": [-2, 8, 1]})
>>> df
A B
0 1 -2
1 2 8
2 3 1
>>> df[["A", "B"]]
A B
0 1 -2
1 2 8
2 3 1
>>> df[["A", "B"]].max(axis=1)
0...
What are Transient and Volatile Modifiers?
Can someone explain what the transient and volatile modifiers mean in Java?
4 Answers
...
Access Denied for User 'root'@'localhost' (using password: YES) - No Privileges?
... answered Jul 31 '13 at 16:42
Andy JonesAndy Jones
5,80644 gold badges2727 silver badges4444 bronze badges
...