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CLP(FD) variable domains & propagation


By : Alaa
Date : September 14 2020, 08:00 PM
help you fix your problem In my Prolog course the past semester, I fell a little behind around the time CLP was introduced. Now I'm trying to catch up, and have tried my hand at a past exam that the professor supplied to all students. ,
It seems to me that the answer should be
code :
Z in 1..99
?- X in 1..7, Y in -3..100, Y #> X, Z #\= 0, Z #= Y -X.
X in 1..7,
Z+X#=Y,
X#=<Y+ -1,
Z in -5.. -1\/1..99,
Y in 2..100.

?- X in 1..7, Y in -3..100, Y #> X, Z #\= 0, Z #= Y -X, Z #< 0.
false.
?- X in 1..7, Y in -3..100, Y #> X, Z #\= 0, Z #= Y -X, clpfd:contracting([X,Y,Z]).
X in 1..7,
Z+X#=Y,
X#=<Y+ -1,
Z in 1..99,
Y in 2..100.


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Why are the transactions rolled back even when propagation=Propagation.REQUIRES_NEW in second method in Spring service c


By : sumedha liyanaarachc
Date : March 29 2020, 07:55 AM
I hope this helps you . Spring's declarative transaction handling works using AOP proxies. When you get a tranasactional bean, you in fact get a proxy which wraps your bean instance, intercepts the method call, starts a transaction if necessary, then calls the actual bean's method, then commits or rollbacks the transaction if necessary.
But you're calling a method of your bean from another method inside the same bean, so the proxy is bypassed, and can't apply any transactional behavior.

Spring Transaction propagation nested Propagation REQUIRES_NEW in Propagation.REQUIRED


By : Vishal
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further There is already an ongoing transaction which basically has its own version of the data. The newly added data is not visible to that transaction. Next to that you have hibernate in the mix, which uses caching and depending on what is executed, the query is only executed once and on subsequent calls it simply returns the cached values (within the same transaction/session for instance).
Links

javax.persistence.TransactionRequiredException: no transaction is in progress, @Transactional(propagation=Propagation.RE


By : Longling
Date : March 29 2020, 07:55 AM
should help you out Use JPA Transaction manager instead of Data source Transaction manager.
code :
JpaTransactionManager transactionManager
        = new JpaTransactionManager();
      transactionManager.setEntityManagerFactory(
        entityManagerFactory().getObject() );
      return transactionManager;
 @Bean(name = "entityManagerFactory")
 public LocalContainerEntityManagerFactoryBean entityManagerFactory() {
  LocalContainerEntityManagerFactoryBean entityManagerFactoryBean = new LocalContainerEntityManagerFactoryBean();
 entityManagerFactoryBean.setDataSource(dataSource());.....

LazyInitializationException from constructor injected @Repository in @Transactional(propagation = Propagation.REQUIRES_N


By : Hung Nguyen
Date : March 29 2020, 07:55 AM
it should still fix some issue Use case:
code :
@Transactional(propagation = Propagation.REQUIRES_NEW)
void import(int csvFileId, String[] csvContent, int lineNumber) {

@Transactional (readOnly = false, propagation = Propagation.REQUIRED) is throwing exception


By : Izwa
Date : March 29 2020, 07:55 AM
will help you If you want to modify some data in database its not possible with readOnly = true. Its ok if you want to retrieve some data set.
So when it comes to UPDATE or INSERT use readOnly = false.
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