javax.persistence.Query.getFirstResult()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.getFirstResult方法的一些代码示例，展示了Query.getFirstResult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.getFirstResult方法的具体详情如下：
包路径：javax.persistence.Query
类名称：Query
方法名：getFirstResult

Query.getFirstResult介绍

[英]The position of the first result the query object was set to retrieve. Returns 0 if setFirstResult was not applied to the query object.
[中]查询对象设置为检索的第一个结果的位置。如果setFirstResult未应用于查询对象，则返回0。

代码示例

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

  1. /**
  2.  * Restricts the max results of the given {@link Query} if the current {@code tree} marks this {@code query} as
  3.  * limited.
  4.  */
  5. private Query restrictMaxResultsIfNecessary(Query query) {
  6.   if (tree.isLimiting()) {
  7.     if (query.getMaxResults() != Integer.MAX_VALUE) {
  8.       /*
  9.        * In order to return the correct results, we have to adjust the first result offset to be returned if:
  10.        * - a Pageable parameter is present
  11.        * - AND the requested page number > 0
  12.        * - AND the requested page size was bigger than the derived result limitation via the First/Top keyword.
  13.        */
  14.       if (query.getMaxResults() > tree.getMaxResults() && query.getFirstResult() > 0) {
  15.         query.setFirstResult(query.getFirstResult() - (query.getMaxResults() - tree.getMaxResults()));
  16.       }
  17.     }
  18.     query.setMaxResults(tree.getMaxResults());
  19.   }
  20.   if (tree.isExistsProjection()) {
  21.     query.setMaxResults(1);
  22.   }
  23.   return query;
  24. }

代码示例来源：origin: Impetus/Kundera

  1. @Override
  2. public int getFirstResult()
  3. {
  4.   return query.getFirstResult();
  5. }

代码示例来源：origin: de.mhus.lib/mhu-lib-persistence

  1. /** {@inheritDoc} */
  2. @Override
  3. public int getFirstResult() {
  4.   return query.getFirstResult();
  5. }

代码示例来源：origin: stackoverflow.com

  1. finally {
  2.   entityTransaction = entityManager.getTransaction();
  3.   entityTransaction.begin();
  4.   Query query = entityManager.createNamedQuery("findEmployeeByName");
  5.   supplierID = query.getFirstResult();
  6.   entityTransaction.commit();
  7.   entityManager.close();
  8. }

代码示例来源：origin: org.evolvis.bsi/kolab-ws

  1. @Override
  2. public int
  3. getFirstResult()
  4. {
  5.   return delegate.getFirstResult();
  6. }

代码示例来源：origin: kumuluz/kumuluzee

  1. @Override
  2. public int getFirstResult() {
  3.   return query.getFirstResult();
  4. }

代码示例来源：origin: org.apache.geronimo.modules/geronimo-persistence-jpa20

  1. @Override
  2. public int getFirstResult() {
  3.   return query.getFirstResult();
  4. }

代码示例来源：origin: org.wildfly/wildfly-jpa

  1. @Override
  2. public int getFirstResult() {
  3.   return underlyingQuery.getFirstResult();
  4. }

代码示例来源：origin: org.jboss.eap/wildfly-jpa

  1. @Override
  2. public int getFirstResult() {
  3.   return underlyingQuery.getFirstResult();
  4. }

代码示例来源：origin: com.kumuluz.ee/kumuluzee-jpa-common

  1. @Override
  2. public int getFirstResult() {
  3.   return query.getFirstResult();
  4. }

代码示例来源：origin: org.apache.openejb/openejb-core

  1. public int getFirstResult() {
  2.   return query.getFirstResult();
  3. }

代码示例来源：origin: org.apache.tomee/openejb-core

  1. public int getFirstResult() {
  2.   return query.getFirstResult();
  3. }

代码示例来源：origin: org.apache.geronimo.ext.openejb/openejb-core

  1. public int getFirstResult() {
  2.   return query.getFirstResult();
  3. }

代码示例来源：origin: stackoverflow.com

  1. em.getTransaction().begin();
  2.  String get_employee_id = "SELECT emp.id FROM Employee as emp WHERE emp.bsn=:bsn";
  3.  Query employee_query = em.createQuery(get_employee_id);
  4.  employee_query.setParameter("bsn", object.getEmployee().getBsn());
  5.  long id = employee_query.getFirstResult();
  6.  System.out.println("query returns employee id: " + id);
  7.  em.getTransaction().commit();

代码示例来源：origin: org.glassfish.main.common/container-common

  1. public int getFirstResult() {
  2.   try {
  3.     if(callFlowAgent.isEnabled()) {
  4.       callFlowAgent.entityManagerQueryStart(EntityManagerQueryMethod.GET_FIRST_RESULT);
  5.     }
  6.     return queryDelegate.getFirstResult();
  7.   } finally {
  8.     if(callFlowAgent.isEnabled()) {
  9.       callFlowAgent.entityManagerQueryEnd();
  10.     }
  11.   }
  12. }

代码示例来源：origin: com.haulmont.cuba/cuba-core

  1. public static QueryKey create(String queryString, boolean softDeletion, boolean singleResult, javax.persistence.Query jpaQuery) {
  2.   return new QueryKey(queryString, jpaQuery.getFirstResult(), jpaQuery.getMaxResults(), softDeletion, singleResult, getNamedParameters(jpaQuery), getPositionalParameters(jpaQuery));
  3. }

代码示例来源：origin: com.haulmont.cuba/cuba-core

  1. public static QueryKey create(String queryString, boolean softDeletion, javax.persistence.Query jpaQuery) {
  2.   return new QueryKey(queryString, jpaQuery.getFirstResult(), jpaQuery.getMaxResults(), softDeletion, false, getNamedParameters(jpaQuery), getPositionalParameters(jpaQuery));
  3. }

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

  1. /**
  2.  * Restricts the max results of the given {@link Query} if the current {@code tree} marks this {@code query} as
  3.  * limited.
  4.  */
  5. private Query restrictMaxResultsIfNecessary(Query query) {
  6.   if (tree.isLimiting()) {
  7.     if (query.getMaxResults() != Integer.MAX_VALUE) {
  8.       /*
  9.        * In order to return the correct results, we have to adjust the first result offset to be returned if:
  10.        * - a Pageable parameter is present
  11.        * - AND the requested page number > 0
  12.        * - AND the requested page size was bigger than the derived result limitation via the First/Top keyword.
  13.        */
  14.       if (query.getMaxResults() > tree.getMaxResults() && query.getFirstResult() > 0) {
  15.         query.setFirstResult(query.getFirstResult() - (query.getMaxResults() - tree.getMaxResults()));
  16.       }
  17.     }
  18.     query.setMaxResults(tree.getMaxResults());
  19.   }
  20.   if (tree.isExistsProjection()) {
  21.     query.setMaxResults(1);
  22.   }
  23.   return query;
  24. }

代码示例来源：origin: org.glassfish.common/container-common

  1. public int getFirstResult() {
  2.   try {
  3.     if(callFlowAgent.isEnabled()) {
  4.       callFlowAgent.entityManagerQueryStart(EntityManagerQueryMethod.GET_FIRST_RESULT);
  5.     }
  6.     Query delegate = getQueryDelegate();
  7.     return delegate.getFirstResult();
  8.   } finally {
  9.     if(callFlowAgent.isEnabled()) {
  10.       callFlowAgent.entityManagerQueryEnd();
  11.     }
  12.   }
  13. }

代码示例来源：origin: com.haulmont.thirdparty/eclipselink

  1. public void addNamedQuery(String name, Query query) {
  2.   DatabaseQuery unwrapped = (DatabaseQuery) query.unwrap(DatabaseQuery.class).clone();
  3.   if (((QueryImpl)query).lockMode != null){
  4.     ((ObjectLevelReadQuery)unwrapped).setLockModeType(((QueryImpl)query).lockMode.name(), session);
  5.   }
  6.   if (unwrapped.isReadQuery()){
  7.     ((ReadQuery)unwrapped).setInternalMax((((QueryImpl)query).getMaxResultsInternal()));
  8.     if (query.getFirstResult() != QueryImpl.UNDEFINED){
  9.       ((ReadQuery)unwrapped).setFirstResult(query.getFirstResult());
  10.     }
  11.   }
  12.   this.getServerSession().addQuery(name, unwrapped, true);
  13. }

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