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Mapping enum to string in hibernate
...pdate mode and I had to drop my table and let hibernate create it again in order to convert my enum from int to varchar. Hopefully it helps someone with similar issue.
– Arashsoft
Feb 15 '18 at 21:35
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Django admin: how to sort by one of the custom list_display fields that has no database field
How could I sort Customers, depending on number_of_orders they have?
3 Answers
3
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Why is 1/1/1970 the “epoch time”?
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How to force the browser to reload cached CSS/JS files?
...it, there's no pain in figuring out which version you need to return to in order for your visitors not to re-download.
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Why is lock(this) {…} bad?
...enerally out of your control who else might be locking on that object.
In order to properly plan parallel operations, special care should be taken to consider possible deadlock situations, and having an unknown number of lock entry points hinders this. For example, any one with a reference to the o...
How to get next/previous record in MySQL?
...o cemkalyoncu's solution:
next record:
SELECT * FROM foo WHERE id > 4 ORDER BY id LIMIT 1;
previous record:
SELECT * FROM foo WHERE id < 4 ORDER BY id DESC LIMIT 1;
edit: Since this answer has been getting a few upvotes lately, I really want to stress the comment I made earlier about un...
Unloading classes in java?
... don't have their interactions clearly and rigorously defined. I think in order to actually be able to unload a class youlre going go have to remove all references to any classes(and their instances) you're trying to unload.
Most people needing to do this type of thing end up using OSGi. OSGi is ...
How to force garbage collection in Java?
...ES it is almost possible to forced you have to call to methods in the same order and at the same time this ones are:
System.gc ();
System.runFinalization ();
even if is just one object to clean the use of this two methods at the same time force the garbage collector to use the finalise() method o...
SQL Group By with an Order By
... all versions of MySQL, simply alias the aggregate in the SELECT list, and order by the alias:
SELECT COUNT(id) AS theCount, `Tag` from `images-tags`
GROUP BY `Tag`
ORDER BY theCount DESC
LIMIT 20
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How do I use ROW_NUMBER()?
...f you returned Row_Number() in your main query,
SELECT ROW_NUMBER() OVER (Order by Id) AS RowNumber, Field1, Field2, Field3
FROM User
Then when you want to go 5 rows back then you can take the current row number and use the following query to determine the row with currentrow -5
SELECT us.Id
FRO...