Discussoes de Programacao e Tecnologia

[RESOLVIDO] Obter um ResultSetMetaData com EntityManager

4 respostas
java
A
antonio.gcn

Pessoal estou tentando obter os nomes das colunas e seus tipos após executar um select * from tabela_X utilizando o entitymanager, porém ele não possui um metadata.

Antes de usar o EntityManager eu fazia isso:

ResultSet rs = null;
ResultSetMetaData meta = null;

rs = this.daoFactory.getSession().connection().createStatement().executeQuery(editorSQL.getComando());
meta = rs.getMetaData();

Ai pronto já tinha tudo o que eu precisava dentro do meta.

Alguém pode me adudar como posso fazer algo parecido com o EntityManager ?

Estou fazendo isso

this.daoFactory.getEntityManager().createNativeQuery((editorSQL.getComando()))
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4 Respostas

A
aix

Ola @antonio.gcn,

eu penso que da mesma forma realizando um unwrap da connection, ex:

Connection connection = entityManager.unwrap(Connection.class);  
DatabaseMetaData metaData = connection.getMetaData();

getMetaData retorna um DatabaseMetaData mas como ResultSetMetaData é uma interface que extends a outra interface Wrapper não tem problema.

ResultSetMetaData metaData = connection.getMetaData();

Interface Wrapper

A
antonio.gcn

Cara da erro ao utilizar entityManager.unwrap

GRAVE: Servlet.service() for servlet [dispatcher] in context with path [/ceos] threw exception [Request processing failed; nested exception is javax.persistence.PersistenceException: Hibernate cannot unwrap interface java.sql.Connection] with root cause
javax.persistence.PersistenceException: Hibernate cannot unwrap interface java.sql.Connection
	at org.hibernate.jpa.spi.AbstractEntityManagerImpl.unwrap(AbstractEntityManagerImpl.java:1524)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:289)
	at com.sun.proxy.$Proxy45.unwrap(Unknown Source)
	at br.gov.sp.saude.fmk.facade.EditorSQLFacade.executarComando(EditorSQLFacade.java:36)
	at br.gov.sp.saude.fmk.controller.EditorSQLController.executa(EditorSQLController.java:55)
	at br.gov.sp.saude.fmk.controller.EditorSQLController$$FastClassBySpringCGLIB$$e45ee74e.invoke(<generated>)
	at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)
	at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:717)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
	at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:98)
	at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:266)
	at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:95)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
	at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:653)
	at br.gov.sp.saude.fmk.controller.EditorSQLController$$EnhancerBySpringCGLIB$$8737386e.executa(<generated>)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:215)
	at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132)
	at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:781)
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:721)
	at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:83)
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:943)
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:877)
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:966)
	at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:868)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:644)
	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
	at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:610)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:534)
	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1081)
	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:658)
	at org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:222)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1566)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1523)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Unknown Source)
A
aix

para o Hibernate você utiliza a session ex:

Session hibernateSession = entityManager.unwrap(Session.class);
Connection jdbcConnection = hibernateSession.connection();
A
antonio.gcn 1 like

[RESOLVIDO] - Cara, muito obrigado, funcionou perfeitamente. :grinning::grinning:

No DaoFactoryModel eu criei um metodo abaixo, utilizando o que você me passou, assim sempre que eu precisar estará lá:

public Connection getHibernateSession(){

Session hibernateSession = (Session) this.getEntityManager().unwrap(Session.class);

Connection jdbcConnection = ((SessionImpl) hibernateSession).connection();

return jdbcConnection;

}
Criado 28 de junho de 2016
Ultima resposta 28 de jun. de 2016
Respostas 4
Participantes 2

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