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What Java ORM do you prefer, and why? [closed]
...ented data models. Instead, your company runs several instances of Oracle, MySQL, MSSQL, DB2 or any other RDBMS.
SQL has a structure and syntax. It should not be expressed using "low-level" String concatenation in JDBC - or "high-level" String concatenation in HQL - both of which are prone to hold s...
What's an elegant way to conditionally add a class to an HTML element in a view?
...lass_string(ok: @success) do %>
<% end %>
<% link_to "Hello", root_path, class: class_string(ok: @success) do %>
<% end %>
Either/Or Classes
For use cases where a ternary would be necessary (e.g. @success ? 'good' : 'bad'), pass an array where the first element is the class ...
How do I increase the number of displayed lines of a Java stack trace dump?
...re
The causes are displayed from the most nested one at the bottom (the "root cause"), to the one which the printed stack trace belongs to.
In this case the root cause is LowLevelException, which caused MidLevelException, which caused HighLevelException.
To get the complete stack trace you have ...
What are the best practices for catching and re-throwing exceptions?
... if it bubbles all the way up and needs to be logged, you can trace to the root exception thrown (walk the chain) so you still have all the debugging information that you need!
Don't simply catch and rethrow the same exception unless you need to do some post-processing. But a block like } catch (E...
Tab space instead of multiple non-breaking spaces (“nbsp”)?
... Was looking for this when building a large concat() query in MySQL for use in a Crystal Report. the ASCII (&#09;) did the job perfectly!
– MikeMighty
Mar 9 '18 at 14:40
...
Stash only one file out of multiple files that have changed with Git?
...bar.txt. The patch generates OK, but I then need to move to the repository root to get the patch to apply. So if you're having trouble with this - just make sure you're doing it from the repository root directory.
– Michael Anderson
Jun 3 '16 at 6:23
...
Heroku Postgres - terminate hung query (idle in transaction)
...icient:
select pg_terminate_backend(1234);
If you have shell access and root or postgres permissions you can also do it from the shell. To "cancel" one can do:
kill -INT 1234
and to "terminate", simply:
kill 1234
DO NOT:
kill -9 1234
... that will often result in the the whole postgres ...
How to customize a requirements.txt for multiple environments?
...equirements into a modular folder hierarchy like this:
`-- django_project_root
|-- requirements
| |-- common.txt
| |-- dev.txt
| `-- prod.txt
`-- requirements.txt
The files' contents would look like this:
common.txt:
# Contains requirements common to all environments
req1==1.0
req2==1.0
r...
String.Join method that ignores empty strings?
...it's even simpler, since you can do it in SQL directly:
PostgreSQL & MySQL:
SELECT
concat_ws(' / '
, NULLIF(searchTerm1, '')
, NULLIF(searchTerm2, '')
, NULLIF(searchTerm3, '')
, NULLIF(searchTerm4, '')
) AS RPT_SearchTerms;
And even with the glori...
Select rows which are not present in other table
... records where join doesn't exist
Similar question on dba.SE targeted at MySQL:
Select rows where value of second column is not present in first column
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