javax.persistence.Query.unwrap()方法的使用及代码示例

x33g5p2x  于2022-01-28 转载在 其他  
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本文整理了Java中javax.persistence.Query.unwrap方法的一些代码示例，展示了Query.unwrap的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。Query.unwrap方法的具体详情如下：
包路径：javax.persistence.Query
类名称：Query
方法名：unwrap

Query.unwrap介绍

[英]Return an object of the specified type to allow access to the provider-specific API. If the provider's query implementation does not support the specified class, the PersistenceException is thrown.
[中]返回指定类型的对象，以允许访问特定于提供程序的API。如果提供程序的查询实现不支持指定的类，则会抛出PersistenceException。

代码示例

代码示例来源：origin: stackoverflow.com

  1. Query q2 = em.createNativeQuery(
  2.   "select sc_cur_code, sc_amount from sector_costs");
  3. q2.unwrap(SQLQuery.class).addScalar("sc_cur_code", StringType.INSTANCE);

代码示例来源：origin: spring-projects/spring-data-jpa

  1. /**
  2.    * Returns the actual target {@link Query} instance, even if the provided query is a {@link Proxy} based on
  3.    * {@link org.springframework.orm.jpa.SharedEntityManagerCreator.DeferredQueryInvocationHandler}.
  4.    * 
  5.    * @param query a {@link Query} instance, possibly a Proxy.
  6.    * @return the class of the actual underlying class if it can be determined, the class of the passed in instance
  7.    *         otherwise.
  8.    */
  9.   private static Class<?> unwrapClass(Query query) {
  10.     Class<? extends Query> queryType = query.getClass();
  11.     try {
  12.       return Proxy.isProxyClass(queryType) //
  13.           ? query.unwrap(null).getClass() //
  14.           : queryType;
  15.     } catch (RuntimeException e) {
  16.       LOGGER.warn("Failed to unwrap actual class for Query proxy.", e);
  17.       return queryType;
  18.     }
  19.   }
  20. }

代码示例来源：origin: javamelody/javamelody

  1. protected String getQueryRequestName(Method javaMethod, Object[] args, Query query) {
  2.   final StringBuilder requestName = new StringBuilder();
  3.   final String methodName = javaMethod.getName();
  4.   requestName.append(methodName, "create".length(), methodName.length());
  5.   appendArgs(requestName, args);
  6.   // with help from Christoph Linder
  7.   // and https://antoniogoncalves.org/2012/05/24/how-to-get-the-jpqlsql-string-from-a-criteriaquery-in-jpa/
  8.   if (HIBERNATE_QUERY_CLASS != null && query.getClass().getName().startsWith("org.hibernate.")
  9.       && requestName.lastIndexOf("@") != -1) {
  10.     // in order to have only one request name instead of patterns like
  11.     // Query(org.hibernate.jpa.criteria.CriteriaQueryImpl@3b0cc2dc)
  12.     final Object unwrappedQuery = query.unwrap(HIBERNATE_QUERY_CLASS);
  13.     return unwrappedQuery.toString();
  14.   } else if (ECLIPSELINK_QUERY_CLASS != null
  15.       && query.getClass().getName().startsWith("org.eclipse.")
  16.       && requestName.lastIndexOf("@") != -1) {
  17.     // in order to have only one request name instead of patterns like
  18.     // Query(org.eclipse.persistence.internal.jpa.querydef.CriteriaQueryImpl@6a55299e)
  19.     final Object unwrappedQuery = query.unwrap(ECLIPSELINK_QUERY_CLASS);
  20.     return unwrappedQuery.toString();
  21.   }
  22.   return requestName.toString();
  23. }

代码示例来源：origin: spring-projects/spring-framework

  1. args[i] = ((Query) arg).unwrap(null);

代码示例来源：origin: hibernate/hibernate-orm

  1. /**
  2.  * Convenience method for {@linkplain Query#getResultList() executing} the Query, applying the
  3.  * given EntityGraph using the specified semantic
  4.  *
  5.  * @param query The JPA Query
  6.  * @param graph The graph to apply
  7.  * @param semantic The semantic to use when applying the graph
  8.  */
  9. @SuppressWarnings("unchecked")
  10. public static List executeList(Query query, EntityGraph graph, GraphSemantic semantic) {
  11.   return query.unwrap( org.hibernate.query.Query.class )
  12.       .applyGraph( (RootGraph) graph, semantic )
  13.       .list();
  14. }

代码示例来源：origin: hibernate/hibernate-orm

  1. /**
  2.  * Convenience method for {@linkplain Query#getResultList() executing} the Query using the
  3.  * given EntityGraph
  4.  *
  5.  * @param query The JPA Query
  6.  * @param graph The graph to apply
  7.  *
  8.  * @apiNote operates on the assumption that the "default" semantic for an
  9.  * entity graph applied to a Query is {@link GraphSemantic#FETCH}.  This is simply
  10.  * knowledge from JPA EG discussions, nothing that is specifically mentioned or
  11.  * discussed in the spec.
  12.  */
  13. @SuppressWarnings({"unused", "unchecked"})
  14. public static List executeList(Query query, EntityGraph graph) {
  15.   return query.unwrap( org.hibernate.query.Query.class )
  16.       .applyFetchGraph( (RootGraph) graph )
  17.       .list();
  18. }

代码示例来源：origin: spring-projects/spring-data-jpa

  1. /**
  2.  * Creates a new {@link HibernateScrollableResultsIterator} for the given {@link Query}.
  3.  *
  4.  * @param jpaQuery must not be {@literal null}.
  5.  */
  6. HibernateScrollableResultsIterator(Query jpaQuery) {
  7.   org.hibernate.query.Query<?> query = jpaQuery.unwrap(org.hibernate.query.Query.class);
  8.   this.scrollableResults = query.setReadOnly(TransactionSynchronizationManager.isCurrentTransactionReadOnly())//
  9.       .scroll(ScrollMode.FORWARD_ONLY);
  10. }

代码示例来源：origin: hibernate/hibernate-orm

  1. /**
  2.  * Convenience method for {@linkplain Query#getResultList() executing} the Query, applying the
  3.  * given EntityGraph using the named semantic using JPA's "hint name" - see
  4.  * {@link GraphSemantic#fromJpaHintName}
  5.  *
  6.  * @param query The JPA Query
  7.  * @param graph The graph to apply
  8.  * @param semanticJpaHintName See {@link GraphSemantic#fromJpaHintName}
  9.  *
  10.  * @return The result list
  11.  */
  12. @SuppressWarnings({"unused", "unchecked"})
  13. public static List executeList(Query query, EntityGraph graph, String semanticJpaHintName) {
  14.   return query.unwrap( org.hibernate.query.Query.class )
  15.       .applyGraph( (RootGraph) graph, GraphSemantic.fromJpaHintName( semanticJpaHintName ) )
  16.       .list();
  17. }

代码示例来源：origin: org.springframework/spring-orm

  1. args[i] = ((Query) arg).unwrap(null);

代码示例来源：origin: hibernate/hibernate-orm

  1. final ProcedureCall unwrapped = query.unwrap( ProcedureCall.class );
  2. if ( unwrapped != null ) {
  3.   addNamedStoredProcedureQuery( name, unwrapped );
  4. org.hibernate.query.Query hibernateQuery = query.unwrap( org.hibernate.query.Query.class );
  5. if ( hibernateQuery != null ) {

代码示例来源：origin: hibernate/hibernate-orm

  1. @Test
  2. public void testNativeSQL() {
  3.   doInJPA( this::entityManagerFactory, entityManager -> {
  4.     List<UUID> books = entityManager.createNativeQuery(
  5.       "select b.id as id " +
  6.       "from Book b " +
  7.       "where b.id = :id")
  8.     .setParameter( "id", book.id )
  9.     .unwrap( NativeQuery.class )
  10.     .addScalar( "id", PostgresUUIDType.INSTANCE )
  11.     .getResultList();
  12.     assertEquals(1, books.size());
  13.   } );
  14. }

代码示例来源：origin: hibernate/hibernate-orm

  1. @Test
  2. public void setParameterWithWrongTypeShouldNotThrowIllegalArgumentException() {
  3.   doInJPA(this::entityManagerFactory, entityManager -> {
  4.     entityManager.createNativeQuery(
  5.       "select id " +
  6.       "from Event " +
  7.       "where readings = :readings" )
  8.     .unwrap( NativeQuery.class )
  9.     .setParameter( "readings", new String[]{null, "a"}, StringArrayType.INSTANCE )
  10.     .getResultList();
  11.   });
  12. }

代码示例来源：origin: hibernate/hibernate-orm

  1. @Test
  2. public void testNativeSQLAddScalar() {
  3.   doInJPA( this::entityManagerFactory, entityManager -> {
  4.     List<Inet> inets = entityManager.createNativeQuery(
  5.       "select e.ip as ip " +
  6.       "from Event e " +
  7.       "where e.id = :id" )
  8.     .setParameter( "id", 1L )
  9.     .unwrap( NativeQuery.class )
  10.     .addScalar( "ip", InetType.INSTANCE )
  11.     .getResultList();
  12.     assertEquals( 1, inets.size() );
  13.     assertEquals( "192.168.0.123/24", inets.get( 0 ).getAddress() );
  14.   } );
  15. }

代码示例来源：origin: Impetus/Kundera

  1. @Override
  2. public <T> T unwrap(Class<T> arg0)
  3. {
  4.   return query.unwrap(arg0);
  5. }

代码示例来源：origin: xujeff/tianti

  1. @SuppressWarnings("unchecked")
  2. public List<Map<String, Object>> querySqlObjects(String sql, Object params, Integer currentPage,Integer rowsInPage){
  3.   Query qry = em.createNativeQuery(sql);
  4.   SQLQuery s = qry.unwrap(SQLQuery.class);

代码示例来源：origin: zstackio/zstack

  1. @Transactional(readOnly = true)
  2.   long count() {
  3.     String jpql = build(true);
  4.     Query q = dbf.getEntityManager().createQuery(jpql);
  5.     if (logger.isTraceEnabled()) {
  6.       org.hibernate.Query hq = q.unwrap(org.hibernate.Query.class);
  7.       logger.trace(hq.getQueryString());
  8.     }
  9.     setQueryValue(q, root);
  10.     return (Long) q.getSingleResult();
  11.   }
  12. }

代码示例来源：origin: xujeff/tianti

  1. SQLQuery s = qry.unwrap(SQLQuery.class);
  2. if (currentPage != null && pageSize != null) {//判断是否有分页

代码示例来源：origin: xujeff/tianti

  1. SQLQuery s = qry.unwrap(SQLQuery.class);
  2. if (currentPage != null && pageSize != null) {//判断是否有分页

代码示例来源：origin: zstackio/zstack

  1. @Transactional(readOnly = true)
  2. List query() {
  3.   if (msg.isFieldQuery()) {
  4.     validateFields();
  5.   }
  6.   String jpql = build(false);
  7.   Query q = msg.isFieldQuery() ? dbf.getEntityManager().createQuery(jpql, Tuple.class) : dbf.getEntityManager().createQuery(jpql);
  8.   if (logger.isTraceEnabled()) {
  9.     org.hibernate.Query hq = q.unwrap(org.hibernate.Query.class);
  10.     logger.trace(hq.getQueryString());
  11.   }
  12.   setQueryValue(q, root);
  13.   if (msg.getLimit() != null) {
  14.     q.setMaxResults(msg.getLimit());
  15.   }
  16.   if (msg.getStart() != null) {
  17.     q.setFirstResult(msg.getStart());
  18.   }
  19.   List vos = q.getResultList();
  20.   if (msg.isFieldQuery()) {
  21.     return convertFieldsTOPartialInventories(vos);
  22.   } else {
  23.     return convertVOsToInventories(vos);
  24.   }
  25. }

代码示例来源：origin: org.springframework.data/spring-data-jpa

  1. /**
  2.  * Creates a new {@link HibernateScrollableResultsIterator} for the given {@link Query}.
  3.  *
  4.  * @param jpaQuery must not be {@literal null}.
  5.  */
  6. HibernateScrollableResultsIterator(Query jpaQuery) {
  7.   org.hibernate.query.Query<?> query = jpaQuery.unwrap(org.hibernate.query.Query.class);
  8.   this.scrollableResults = query.setReadOnly(TransactionSynchronizationManager.isCurrentTransactionReadOnly())//
  9.       .scroll(ScrollMode.FORWARD_ONLY);
  10. }

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