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Persistence unit as RESOURCE_LOCAL or JTA?
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You must use the
EntityTransaction API to begin/commit around
every call to your EntityManger Calling
entityManagerFactory.createEntityManager() twice results in
two separate EntityManager instances and therefor
two separate PersistenceContexts/Caches. It
is almost never a good idea t...
Creating Threads in python
...rgument in the Thread constructor to directly pass in a function that gets called instead of run.
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Django using get_user_model vs settings.AUTH_USER_MODEL
.../ManyToMany-relation.
From the changelog:
get_user_model() can now be called at import time, even in modules that define models.
so... is there still a reason to use settings.AUTH_USER_MODEL? Well, the docs still recommend the settings.AUTH_USER_MODEL (which is a string) for defining relation...
CreateElement with id?
I'm trying to modify this code to also give this div item an ID, however I have not found anything on google, and idName does not work. I read something about append , however it seems pretty complicated for a task that seems pretty simple, so is there an alternative? Thanks :)
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Difference Between ViewData and TempData?
...se it all the time, but in ASP.NET Preview 5 they introduced something new called TempData.
6 Answers
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How do I put an 'if clause' in an SQL string?
...seOrder
SET purchaseOrder_status = 'COMPLETED'
WHERE purchaseOrder_ID = '@purchaseOrder_ID' and
not exists (SELECT *
FROM itemsOrdered WHERE purchaseOrder_ID = '@purchaseOrdered_ID' AND status = 'PENDING'
)
However, I might guess that yo...
C++ Exceptions questions on rethrow of original exception
...the catch cause the rethrown exception to see the effect of append() being called?
4 Answers
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What is the recommended way to use Vim folding for Python code
...ode.
#Toggle fold methods \fo
let g:FoldMethod = 0
map <leader>fo :call ToggleFold()<cr>
fun! ToggleFold()
if g:FoldMethod == 0
exe 'set foldmethod=indent'
let g:FoldMethod = 1
else
exe 'set foldmethod=marker'
let g:FoldMethod = 0
endif
endfu...
updating table rows in postgres using subquery
... address=subquery.address,
partn=subquery.partn
FROM (SELECT address_id, customer, address, partn
FROM /* big hairy SQL */ ...) AS subquery
WHERE dummy.address_id=subquery.address_id;
This syntax is not standard SQL, but it is much more convenient for this type of query than standard ...
SQL Server add auto increment primary key to existing table
...ting table which is already populated with 150000 records. I have added an Id column (which is currently null).
15 Answers
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