大约有 40,000 项符合查询结果（耗时：0.0529秒） [XML]
How do I check for a network connection?
...rk Connectivity Status Indicator) technic:
NCSI performs a DNS lookup on www.msftncsi.com, then requests http://www.msftncsi.com/ncsi.txt. This file is a plain-text file and contains only the text 'Microsoft NCSI'.
NCSI sends a DNS lookup request for dns.msftncsi.com. This DNS address should resol...
Beginner's guide to ElasticSearch [closed]
...re hasn't been any books about ElasticSearch (that I know of), and http://www.elasticsearch.org/guide/ seems to contain only references.
...
“INSERT IGNORE” vs “INSERT … ON DUPLICATE KEY UPDATE”
...
I would recommend using INSERT...ON DUPLICATE KEY UPDATE.
If you use INSERT IGNORE, then the row won't actually be inserted if it results in a duplicate key. But the statement won't generate an error. It generates a warning instead....
Execution failed app:processDebugResources Android Studio
... this have any side effects on the actual project?
– committedandroider
Dec 21 '14 at 22:01
11
Th...
What are naming conventions for MongoDB?
...le that designed the schema did a good
job.
Content from: http://www.tutespace.com/2016/03/schema-design-and-naming-conventions-in.html
For collections I'm following these suggested patterns until I find official MongoDB documentation.
...
List of all index & index columns in SQL Server DB
...r his AND ...s without worrying about which was first. See: stackoverflow.com/a/8149183/1160796 and stackoverflow.com/a/242831/1160796
– basher
Dec 4 '14 at 16:34
...
How can I add an item to a IEnumerable collection?
... if it was an array - it uses ElementAt under the hood): connect.microsoft.com/VisualStudio/feedback/…. If we also get two more overloads of Concat to take a single item both on the left and on the right, this would cut down the typing to xs +=x - so go poke Mads (Torgersen) to prioritize this in...
Select something that has more/less than x character
...ngth(), mysql also uses Length.
Here is the Oracle documentation:
http://www.techonthenet.com/oracle/functions/length.php
And here is the mySQL Documentation of Length(string):
http://dev.mysql.com/doc/refman/5.1/en/string-functions.html#function_length
For PostgreSQL, you can use length(string...
Hex representation of a color with alpha channel?
...
It looks like there is no hex alpha format: http://www.w3.org/TR/css3-color/
Anyway, if you use a CSS preprocessor like SASS then you can pass an hex to rgba:
background:
rgba(#000, 0.5);
And the preprocessor just converts the hex code to rgb automatically.
...