@Transaction annotation between layers in Spring -


what difference in using @transactional annotation in domain/service layer , dao layer. provide advantage using in domain layer.

it practice use @transactional in service layer because governs logic needed identify scope of database and/or business transaction. persistence layer design doesn't know scope of transaction.

daos can made @transactional other bean, it's common practice use in service layer. tend because want separation of concerns. persistence layer retrieve / stores data , forth database.

for example, if want transfer amount 1 account another, need 2 operations, 1 account needs debited other needs credited. so, scope of these operation known service layer , not persistence layer.

the persistence layer cannot know transaction it's in, take example method person.updateusername(). should run in it's own separate transaction always? there no way know, depends on business logic calling it.

here few thread should read

where @transactional annotation belong?

where should "@transactional" place service layer or dao


Comments

Post a Comment

Popular posts from this blog

networking - Vagrant-provisioned VirtualBox VM is not reachable from Ubuntu host -

this question exact duplicate of: puphpet/vagrant: unable access lamp vm ip address 1 answer i following basic vagrant tutorial , vagrant provisions box on ubuntu without complaining. moreover, can vagrant ssh vm. however, vm not reachable host: it's not possible ping it's ip address. what have achieved: installed virtualbox (5.1.24 r117012 (qt5.5.1)) , vagrant (1.9.7) onto ubuntu (16.04.2 lts) machine. provisioned vm vagrant up , vagrant finishes job , not complain. vagrant ssh works. i have manually installed lighttpd on guest vm , can ping/curl address: localhost within guest vm. this when trying reach guest vm host: ~/tmp/myfirstvagrantproject$ ping 172.22.22.22 ping 172.22.22.22 (172.22.22.22) 56(84) bytes of data. ... icmp_seq=4 destination net unreachable ... 171 packets transmitted, 0 received, +21 errors, 100% packet loss, time 173
Read more

c# - ASP.NET Core - There is already an object named 'AspNetRoles' in the database -

i'm receiving error applicationdbcontext database when trying update entity framework. i've googled, tried fixes here on so, no avail. i'm deleting database each time make change, once deploy, not option. here's error: pm> update-database -context applicationdbcontext system.data.sqlclient.sqlexception: there object named 'aspnetroles' in database. @ system.data.sqlclient.sqlconnection.onerror(sqlexception exception, boolean breakconnection, action 1 wrapcloseinaction) @ system.data.sqlclient.tdsparser.throwexceptionandwarning(tdsparserstateobject stateobj, boolean callerhasconnectionlock, boolean asyncclose) @ system.data.sqlclient.tdsparser.tryrun(runbehavior runbehavior, sqlcommand cmdhandler, sqldatareader datastream, bulkcopysimpleresultset bulkcopyhandler, tdsparserstateobject stateobj, boolean& dataready) @ system.data.sqlclient.sqlcommand.runexecutenonquerytds(string methodname, boolean async, int32 timeout, boolean
Read more

ruby on rails - ArgumentError: Missing host to link to! Please provide the :host parameter, set default_url_options[:host], or set :only_path to true -

i have built module in solidus , ruby on rails , try create tests. i trying create integration tests , have error: e error: prescriptionphotostest#test_/prescription_photos_post_endpoint_throws_an_error_when_wrong_params: argumenterror: missing host link to! please provide :host parameter, set default_url_options[:host], or set :only_path true test/integration/prescription_photos_test.rb:6:in `block in ' i read this , this , doesn't make difference. my code returning error on line: @user = factorygirl.create(:user) here code files. prescription_photos_rest.rb require 'test_helper' class prescriptionphotostest < actiondispatch::integrationtest setup spree::auth::config[:confirmable] = false @user = factorygirl.create(:user) end def authenticated_header token = knock::authtoken.new(payload: { sub: @user.id }).token { 'authorization': "bearer #{token}" } end test '/prescription_p
Read more