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What are detached, persistent and transient objects in hibernate?
...osing the session that read in the instance, one can detach an instance by calling session.evict(). This removes it from being managed by Hibernate (thus prevent changes to the instance from being automatically propagated back to the db). You can send changes to the db via session.update(), and re-a...
Postgres manually alter sequence
...('payments_id_seq', 21, true); # next value will be 22
Otherwise you're calling setval with a single argument, while it requires two or three.
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Java - JPA - @Version annotation
...t you could consider making the setter protected as you're not supposed to call it.
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Change auto increment starting number?
... @SQL;
EXECUTE _stmt;
DEALLOCATE PREPARE _stmt;
END//
DELIMITER ;
CALL update_auto_increment('your_table_name')
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Creating an abstract class in Objective-C
...
Typically, Objective-C class are abstract by convention only—if the author documents a class as abstract, just don't use it without subclassing it. There is no compile-time enforcement that prevents instantiation of an abstract...
How to check Oracle database for long running queries
...l# to see what belongs together.
select s.username,s.sid,s.serial#,s.last_call_et/60 mins_running,q.sql_text from v$session s
join v$sqltext_with_newlines q
on s.sql_address = q.address
where status='ACTIVE'
and type <>'BACKGROUND'
and last_call_et> 60
order by sid,serial#,q.piece
...
REST API - why use PUT DELETE POST GET?
...on: Post is defined as a non-idempotent method. This means that subsequent calls of the same Post method will result in different server states. Get, Put, and Delete, are idempotent; which means that calling them multiple times should result in an identical server state.
This means that a request s...
how to access iFrame parent page using jquery?
... In my experience, the iframe source would not have jQuery but the need to call one of the parent's jQuery functions is often needed. To do this use: window.document.$("#parentPrice").html() This was the answer Álvaro G. Vicario posted.
– David Kinkead
Aug 7...
What is Data Transfer Object?
...pattern.
Another use for DTOs can be to encapsulate parameters for method calls. This can be useful if a method takes more than 4 or 5 parameters.
When using the DTO pattern, you would also make use of DTO assemblers. The assemblers are used to create DTOs from Domain Objects, and vice versa.
The...
How to store arrays in MySQL?
...nformation about the fruit in the fruits table, and any information specifically about the relationship between a particular person and a particular fruit in the person_fruit table. Because in this example there isn't any additional information the person_fruit table is only two columns, the primary...