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@OneToMany List vs Set difference
Is there any difference if I use
2 Answers
2
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How to visualize an XML schema? [closed]
I have made an XML Schema - all the code basically - and was wondering if there is a way that the code can generate something like this:
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R script line numbers at error?
If I am running a long R script from the command line (R --slave script.R), how can I get it to give line numbers at errors?
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Getting name of the class from an instance
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if all you want to do is test an object to see if it's a type of a certain Class
BOOL test = [self isKindOfClass:[SomeClass class]];
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Convert number to month name in PHP
...c representation of a month, with leading zeroes.
Alternative solution:
If you're using an older PHP version and can't upgrade at the moment, you could this solution.
The second parameter of date() function accepts a timestamp, and you could use mktime() to create one, like so:
$monthNum = 3;
$...
Why do you need to create a cursor when querying a sqlite database?
...be used to fetch data from the DBMS into an
application but also to identify a row in a table to be updated or
deleted. The SQL:2003 standard defines positioned update and
positioned delete SQL statements for that purpose. Such statements do
not use a regular WHERE clause with predicates. In...
Correct use of flush() in JPA/Hibernate
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if flush() sends data to the database? what happens if an exception is thrown after that? Will the entity manager rollback everything? even the data written in the first flush?
– Jaime Hablutzel
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Disabling contextual LOB creation as createClob() method threw error
... when Hibernate tries to retrieve some meta information from the database. If this annoys you, you can disable it:
hibernate.temp.use_jdbc_metadata_defaults false
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IntelliJ IDEA shows errors when using Spring's @Autowired annotation
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But what if you actually forget to annotate a bean. You won't get any warning?
– Cleankod
Nov 22 '15 at 15:56
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Rails has_and_belongs_to_many migration
...rom the docs:
There is also a generator which will produce join tables if JoinTable
is part of the name:
Your migration file (note the :id => false; it's what prevents the creation of a primary key):
Rails 3
class CreateRestaurantsUsers < ActiveRecord::Migration
def self.up
c...