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

Query.setFetchSize介绍

[英]Set a fetch size for the underlying JDBC query.
[中]为基础JDBC查询设置获取大小。

代码示例

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

/**
 * Get a cursor over all of the results, with the forward-only flag set.
 *
 * @param fetchSize the fetch size to use retrieving the results
 * @param parameterValues the parameter values to use (or null if none).
 *
 * @return a forward-only {@link ScrollableResults}
 */
public ScrollableResults getForwardOnlyCursor(int fetchSize, Map<String, Object> parameterValues) {
  Query query = createQuery();
  if (parameterValues != null) {
    query.setProperties(parameterValues);
  }
  return query.setFetchSize(fetchSize).scroll(ScrollMode.FORWARD_ONLY);
}

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

/**
 * Read a page of data, clearing the existing session (if necessary) first,
 * and creating a new session before executing the query.
 *
 * @param page the page to read (starting at 0)
 * @param pageSize the size of the page or maximum number of items to read
 * @param fetchSize the fetch size to use
 * @param parameterValues the parameter values to use (if any, otherwise
 * null)
 * @return a collection of items
 */
public Collection<? extends T> readPage(int page, int pageSize, int fetchSize, Map<String, Object> parameterValues) {
  clear();
  Query query = createQuery();
  if (parameterValues != null) {
    query.setProperties(parameterValues);
  }
  @SuppressWarnings("unchecked")
  List<T> result = query.setFetchSize(fetchSize).setFirstResult(page * pageSize).setMaxResults(pageSize).list();
  return result;
}

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

/**
 * Prepare the given Query object, applying cache settings and/or
 * a transaction timeout.
 * @param queryObject the Query object to prepare
 * @see #setCacheQueries
 * @see #setQueryCacheRegion
 */
@SuppressWarnings({"rawtypes", "deprecation"})
protected void prepareQuery(org.hibernate.Query queryObject) {
  if (isCacheQueries()) {
    queryObject.setCacheable(true);
    if (getQueryCacheRegion() != null) {
      queryObject.setCacheRegion(getQueryCacheRegion());
    }
  }
  if (getFetchSize() > 0) {
    queryObject.setFetchSize(getFetchSize());
  }
  if (getMaxResults() > 0) {
    queryObject.setMaxResults(getMaxResults());
  }
  ResourceHolderSupport sessionHolder =
      (ResourceHolderSupport) TransactionSynchronizationManager.getResource(obtainSessionFactory());
  if (sessionHolder != null && sessionHolder.hasTimeout()) {
    queryObject.setTimeout(sessionHolder.getTimeToLiveInSeconds());
  }
}

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

/**
 * Prepare the given Query object, applying cache settings and/or
 * a transaction timeout.
 * @param queryObject the Query object to prepare
 * @see #setCacheQueries
 * @see #setQueryCacheRegion
 */
@SuppressWarnings({"rawtypes", "deprecation"})
protected void prepareQuery(org.hibernate.Query queryObject) {
  if (isCacheQueries()) {
    queryObject.setCacheable(true);
    if (getQueryCacheRegion() != null) {
      queryObject.setCacheRegion(getQueryCacheRegion());
    }
  }
  if (getFetchSize() > 0) {
    queryObject.setFetchSize(getFetchSize());
  }
  if (getMaxResults() > 0) {
    queryObject.setMaxResults(getMaxResults());
  }
  ResourceHolderSupport sessionHolder =
      (ResourceHolderSupport) TransactionSynchronizationManager.getResource(obtainSessionFactory());
  if (sessionHolder != null && sessionHolder.hasTimeout()) {
    queryObject.setTimeout(sessionHolder.getTimeToLiveInSeconds());
  }
}

代码示例来源：origin: stackoverflow.com

Query query = session.createQuery(query);
query.setReadOnly(true);
// MIN_VALUE gives hint to JDBC driver to stream results
query.setFetchSize(Integer.MIN_VALUE);
ScrollableResults results = query.scroll(ScrollMode.FORWARD_ONLY);
// iterate over results
while (results.next()) {
  Object row = results.get();
  // process row then release reference
  // you may need to evict() as well
}
results.close();

代码示例来源：origin: riotfamily/riot

public TypedQuery<T> setFetchSize(int fetchSize) {
  query.setFetchSize(fetchSize);
  return this;
}

代码示例来源：origin: com.github.cafdataprocessing/corepolicy-hibernate

@Override
public Query setFetchSize(int i) {
  return query.setFetchSize(i);
}

代码示例来源：origin: org.hibernate/com.springsource.org.hibernate.ejb

@Override
protected void applyFetchSize(int fetchSize) {
  query.setFetchSize( fetchSize );
}

代码示例来源：origin: ezbz/projectx

@Override
public Query setFetchSize(final int fetchSize) {
 return query.setFetchSize(fetchSize);
}

代码示例来源：origin: culturecommunication/ginco

@Override
public List<ThesaurusConcept> getConceptsWoNotes(String idThesaurus, int startIndex, int limit) {
  Query query = getCurrentSession().createSQLQuery("select c.* "
      + "from thesaurus_concept c  "
      + "left join note n on c.identifier = n.conceptid  "
      + "where c.thesaurusid=:pthesaurusid"
      + " and n.identifier is null").addEntity(ThesaurusConcept.class);
  query.setParameter("pthesaurusid", idThesaurus);
  query.setFirstResult(startIndex);
  query.setFetchSize(limit);
  query.setMaxResults(limit);
  return (List<ThesaurusConcept>) query.list();
}

代码示例来源：origin: stackoverflow.com

Query q = session.createCriteria(... no offset or limit ...);
q.setCacheMode(CacheMode.IGNORE);
q.setFetchSize(1000);  // experiment with this to optimize performance vs. memory
ScrollableResults iterator = query.scroll(ScrollMode.FORWARD_ONLY);
while (iterator.next()) {
 Product p = (Product)iterator.get();
 ...
 // session.evict(p);  // an alternative to setting the cache mode above
}

代码示例来源：origin: stackoverflow.com

Query query = session.createQuery(query);
query.setReadOnly(true);
// MIN_VALUE gives hint to JDBC driver to stream results
query.setFetchSize(Integer.MIN_VALUE);
ScrollableResults results = query.scroll(ScrollMode.FORWARD_ONLY);
// iterate over results
while (results.next()) {
  Object row = results.get();
  // process row then release reference
  // you may need to evict() as well
}
results.close();

代码示例来源：origin: stackoverflow.com

Query query = session.createQuery(query);
query.setReadOnly(true);
// MIN_VALUE gives hint to JDBC driver to stream results
query.setFetchSize(Integer.MIN_VALUE);
ScrollableResults results = query.scroll(ScrollMode.FORWARD_ONLY);
// iterate over results
while (results.next()) {
  Object row = results.get();
  // process row then release reference
  // you may need to flush() as well
}
results.close();

代码示例来源：origin: stackoverflow.com

Query query = session.createQuery(query);
query.setReadOnly(true);
query.setFetchSize(Integer.MIN_VALUE);
ScrollableResults results = query.scroll(ScrollMode.FORWARD_ONLY);
// iterate over results
while (results.next()) {
  Object row = results.get();
  // process row then release reference
  // you may need to evict() as well
}
results.close();

代码示例来源：origin: stackoverflow.com

Query query = session.createQuery(query);
query.setReadOnly(true);
query.setFetchSize(50);
ScrollableResults results = query.scroll(ScrollMode.FORWARD_ONLY);
// iterate over results
while (results.next()) {
  Object row = results.get();
  // process row then release reference
  // you may need to flush() as well
}
results.close();

代码示例来源：origin: jboss.jboss-embeddable-ejb3/hibernate-all

private void initQuery(Query query, NamedQueryDefinition nqd) {
  query.setCacheable( nqd.isCacheable() );
  query.setCacheRegion( nqd.getCacheRegion() );
  if ( nqd.getTimeout()!=null ) query.setTimeout( nqd.getTimeout().intValue() );
  if ( nqd.getFetchSize()!=null ) query.setFetchSize( nqd.getFetchSize().intValue() );
  if ( nqd.getCacheMode() != null ) query.setCacheMode( nqd.getCacheMode() );
  query.setReadOnly( nqd.isReadOnly() );
  if ( nqd.getComment() != null ) query.setComment( nqd.getComment() );
}

代码示例来源：origin: org.hibernate/com.springsource.org.hibernate

private void initQuery(Query query, NamedQueryDefinition nqd) {
  query.setCacheable( nqd.isCacheable() );
  query.setCacheRegion( nqd.getCacheRegion() );
  if ( nqd.getTimeout()!=null ) query.setTimeout( nqd.getTimeout().intValue() );
  if ( nqd.getFetchSize()!=null ) query.setFetchSize( nqd.getFetchSize().intValue() );
  if ( nqd.getCacheMode() != null ) query.setCacheMode( nqd.getCacheMode() );
  query.setReadOnly( nqd.isReadOnly() );
  if ( nqd.getComment() != null ) query.setComment( nqd.getComment() );
}

代码示例来源：origin: org.hibernate/com.springsource.org.hibernate.core

private void initQuery(Query query, NamedQueryDefinition nqd) {
  query.setCacheable( nqd.isCacheable() );
  query.setCacheRegion( nqd.getCacheRegion() );
  if ( nqd.getTimeout()!=null ) query.setTimeout( nqd.getTimeout().intValue() );
  if ( nqd.getFetchSize()!=null ) query.setFetchSize( nqd.getFetchSize().intValue() );
  if ( nqd.getCacheMode() != null ) query.setCacheMode( nqd.getCacheMode() );
  query.setReadOnly( nqd.isReadOnly() );
  if ( nqd.getComment() != null ) query.setComment( nqd.getComment() );
}

代码示例来源：origin: org.jboss.seam/jboss-seam

protected org.hibernate.Query createQuery()
{
 parseEjbql();
 
 evaluateAllParameters();
 
 org.hibernate.Query query = getSession().createQuery( getRenderedEjbql() );
 setParameters( query, getQueryParameterValues(), 0 );
 setParameters( query, getRestrictionParameterValues(), getQueryParameterValues().size() );
 if ( getFirstResult()!=null) query.setFirstResult( getFirstResult() );
 if ( getMaxResults()!=null) query.setMaxResults( getMaxResults()+1 ); //add one, so we can tell if there is another page
 if ( getCacheable()!=null ) query.setCacheable( getCacheable() );
 if ( getCacheRegion()!=null ) query.setCacheRegion( getCacheRegion() );
 if ( getFetchSize()!=null ) query.setFetchSize( getFetchSize() );
 return query;
}

代码示例来源：origin: OpenNMS/opennms

private void prepareQuery(Query queryObject) {
  if(getHibernateTemplate().isCacheQueries()) {
    queryObject.setCacheable(true);
    if(getHibernateTemplate().getQueryCacheRegion() != null) {
      queryObject.setCacheRegion(getHibernateTemplate().getQueryCacheRegion());
    }
  }
  if(getHibernateTemplate().getFetchSize() > 0) {
    queryObject.setFetchSize(getHibernateTemplate().getFetchSize());
  }
  if(getHibernateTemplate().getMaxResults() > 0) {
    queryObject.setMaxResults(getHibernateTemplate().getMaxResults());
  }
}

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