大约有 40,000 项符合查询结果（耗时：0.0602秒） [XML]
List columns with indexes in PostgreSQL
...um = ANY(ix.indkey)
and t.relkind = 'r'
and t.relname like 'test%'
order by
t.relname,
i.relname;
table_name | index_name | column_name
------------+------------+-------------
test | pk_test | a
test | pk_test | b
test2 | uk_test2 | b
test2 | uk_te...
How do I preview emails in Rails?
...tes contain any dynamic data, it won't work. E.g. suppose your email is an order receipt and within it you print out @order.total_price - using the previous method the @order variable will be nil.
Here's a little recipe I use:
First, since this email preview functionality is definitely for interna...
How does having a dynamic variable affect performance?
...18ms
LazyILEmitted: 14.3483ms
So while using the dynamic keyword takes an order of magnitude longer than calling the method directly, it still manages to complete the operation a million times in about 50 milliseconds, making it far faster than reflection. If the method we call were trying to do so...
Setting environment variables for accessing in PHP when using Apache
...same backend structure with multiple frameworks (laravel, express, django, etc.) and some developers of those other languages say its' not appropriate to use .env and that the "server config" should be used instead, or doing it through the command line, heroku style
– OzzyTheGi...
Disable password authentication for SSH [closed]
...
In file /etc/ssh/sshd_config
# Change to no to disable tunnelled clear text passwords
#PasswordAuthentication no
Uncomment the second line, and, if needed, change yes to no.
Then run
service ssh restart
...
Convert PDF to image with high resolution
...image. That's also the amount of pixels the sharpen, contrast, compression etc. settings work on.
– Daniel Schneller
Aug 2 '13 at 7:30
8
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Regex - Should hyphens be escaped? [duplicate]
...er in the range (e.g. [-a-z] or [0-9-]), OR escape it (e.g. [a-z\-0-9]) in order to add "hyphen" to your class.
It's more common to find a hyphen placed first or last within a character class, but by no means will you be lynched by hordes of furious neckbeards for choosing to escape it instead.
(A...
Difference between Hive internal tables and external tables?
...use lists of partitions without going to the file-system and finding them, etc). These sorts of things are the 'metadata'.
When you drop an internal table, it drops the data, and it also drops the metadata.
When you drop an external table, it only drops the meta data. That means hive is ignorant o...
CSS table-cell equal width
... To expand on this, this works for simple layouts (1x1, 2x2, 3x3, etc) but complex layouts (1x3x1, 1x2x3x4, etc) require additional divs with display:table to be used as if they were rows, not display:tabl-row as some might expect. Example here.
– filoxo
...
Why would one use REST instead of SOAP based services? [closed]
...ess duplication (HTTP already represents operations like DELETE, PUT, GET, etc. that have to otherwise be represented in a SOAP envelope).
More standardized - HTTP operations are well understood and operate consistently. Some SOAP implementations can get finicky.
More human readable and testable ...