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What is the difference between CascadeType.REMOVE and orphanRemoval in JPA?
... and remove the post entity:
Post post = entityManager.createQuery("""
select p
from Post p
join fetch p.comments
where p.id = :id
""", Post.class)
.setParameter("id", postId)
.getSingleResult();
entityManager.remove(post);
Hibernate is going to execute three delete statements:...
How to replace part of string by position?
... extra cost by working within a pre-allocated section of memory and moving chars round within it.
– redcalx
Apr 17 '18 at 15:52
...
PostgreSQL wildcard LIKE for any of a list of words
... can use Postgres' SIMILAR TO operator which supports alternations, i.e.
select * from table where lower(value) similar to '%(foo|bar|baz)%';
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How to get error message when ifstream open fails
...< "opened " << fileName << std::endl;
}
int main(int argc, char* argv[]) {
try {
process(argv[1]);
} catch (const std::system_error& e) {
std::clog << e.what() << " (" << e.code() << ")" << std::endl;
}
return 0;
}
E...
Reset identity seed after deleting records in SQL Server
...any a times we need to just reseed to next Id available
declare @max int
select @max=max([Id])from [TestTable]
if @max IS NULL //check when max is returned as null
SET @max = 0
DBCC CHECKIDENT ('[TestTable]', RESEED,@max)
This will check the table and reset to the next ID.
...
Convert JS date time to MySQL datetime
...me()-(starttime.getTimezoneOffset()*60000));
// toISOString() is always 24 characters long: YYYY-MM-DDTHH:mm:ss.sssZ.
// .slice(0, 19) removes the last 5 chars, ".sssZ",which is (UTC offset).
// .replace('T', ' ') removes the pad between the date and time.
var formatedMysqlString = fixedtime.toISOSt...
intellij - spring is not being recognized (Unmapped Spring configuration)
...alog (either by clicking the warning or through file=>project structure
select the modules item in the left hand list
go through and right click on the modules with missing files and select Add=>Spring
in the new tab click the + button
you should now see a list of the xml files. Check the box...
Generate random 5 characters string
I want to create exact 5 random characters string with least possibility of getting duplicated. What would be the best way to do it? Thanks.
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JPA EntityManager: Why use persist() over merge()?
...
I noticed that when I used em.merge, I got a SELECT statement for every INSERT, even when there was no field that JPA was generating for me--the primary key field was a UUID that I set myself. I switched to em.persist(myEntityObject) and got just INSERT statements then...
The maximum recursion 100 has been exhausted before statement completion
...@EntDt = '12/31/2009';
declare @dcnt int;
;with DateList as
(
select @STARTDATE DateValue
union all
select DateValue + 1 from DateList
where DateValue + 1 < convert(VARCHAR(15),@EntDt,101)
)
select count(*) as DayCnt from (
select DateValue,...