[英]@Modifying annotation in the latest Spring Data JPA versions?
[英]what does the return value of @Modifying methods in Spring Data JPA mean
@Repository
public interface LoginDao extends JpaRepository<LoginEntity, Integer> { //}, LoginDaoCustom {
LoginEntity findByLogin(String login);
@Modifying
int changePassword(String password, String login);
}
如果我将changePassword的返回值更改为int以外的任何值,我会得到以下错误。
Caused by: java.lang.IllegalArgumentException: Modifying queries can only use void or int/Integer as return type!
at org.springframework.util.Assert.isTrue(Assert.java:65)
at org.springframework.data.jpa.repository.query.JpaQueryExecution$ModifyingExecution.<init>(JpaQueryExecution.java:166)
at org.springframework.data.jpa.repository.query.AbstractJpaQuery.getExecution(AbstractJpaQuery.java:106)
at org.springframework.data.jpa.repository.query.AbstractJpaQuery.execute(AbstractJpaQuery.java:86)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:337)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:96)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:260)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:94)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:155)
... 46 more
这个整数返回值是什么意思? 我确信春天有记录在某处,但我找不到它。 它未列在jpa.modifying-queries中
我应该补充一点,如果将返回类型声明为int,则更新将以静默方式失败,并且不会更新值。
int / Integer返回值是数据库中更新的行数。
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