org.hibernate.ScrollableResults.beforeFirst()方法的使用及代码示例

x33g5p2x  于2022-01-30 转载在 其他  
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本文整理了Java中org.hibernate.ScrollableResults.beforeFirst()方法的一些代码示例，展示了ScrollableResults.beforeFirst()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。ScrollableResults.beforeFirst()方法的具体详情如下：
包路径：org.hibernate.ScrollableResults
类名称：ScrollableResults
方法名：beforeFirst

ScrollableResults.beforeFirst介绍

[英]Go to a location just before first result, This is the location of the cursor on a newly returned scrollable result.
[中]转到第一个结果之前的位置，这是光标在新返回的可滚动结果上的位置。

代码示例

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

assertTrue( results.isLast() );
results.beforeFirst();
assertFalse( results.isFirst() );
assertFalse( results.isLast() );

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

assertFalse( results.isLast() );
results.beforeFirst();
assertFalse( results.isFirst() );
assertFalse( results.isLast() );

代码示例来源：origin: com.atlassian.hibernate/hibernate.adapter

@Override
public void beforeFirst() throws HibernateException {
  try {
    results.beforeFirst();
  } catch (final PersistenceException ex) {
    throw HibernateExceptionAdapter.adapt(ex);
  }
}

代码示例来源：origin: sakaiproject/sakai

public Object doInHibernate(Session session) throws HibernateException{
   ArrayList page = new ArrayList();
   Query q = session.createQuery(queryString);
   if (value != null) {
     q.setInteger(0, value.intValue());
   }
   ScrollableResults assessmentList = q.scroll();
   if (assessmentList.first()){ // check that result set is not empty
    int first = pageSize * (pageNumber - 1);
    int i = 0;
    assessmentList.setRowNumber(first);
    assessmentList.beforeFirst();
    while ( (pageSize > i++) && assessmentList.next()){
     log.debug("**** add "+i);
     page.add(assessmentList.get(0));
    }
   }
   return page;
  }
};

代码示例来源：origin: org.sakaiproject.samigo/samigo-services

public Object doInHibernate(Session session) throws HibernateException{
   ArrayList page = new ArrayList();
   Query q = session.createQuery(queryString);
   if (value != null) {
     q.setInteger(0, value.intValue());
   }
   ScrollableResults assessmentList = q.scroll();
   if (assessmentList.first()){ // check that result set is not empty
    int first = pageSize * (pageNumber - 1);
    int i = 0;
    assessmentList.setRowNumber(first);
    assessmentList.beforeFirst();
    while ( (pageSize > i++) && assessmentList.next()){
     log.debug("**** add "+i);
     page.add(assessmentList.get(0));
    }
   }
   return page;
  }
};

代码示例来源：origin: stackoverflow.com

Query q = sess.createQuery("select cat.name, cat from DomesticCat cat " +
              "order by cat.name");
ScrollableResults cats = q.scroll();
if ( cats.first() ) {

  // find the first name on each page of an alphabetical list of cats by name
  firstNamesOfPages = new ArrayList();
  do {
    String name = cats.getString(0);
    firstNamesOfPages.add(name);
  }
  while ( cats.scroll(PAGE_SIZE) );

  // Now get the first page of cats
  pageOfCats = new ArrayList();    
  cats.beforeFirst();    
  int i=0;    
  while( ( PAGE_SIZE > i++ ) && cats.next() ) pageOfCats.add( cats.get(1) );

}

cats.close()

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

@Test
public void testScrollEmptyHits() throws Exception {
  FullTextSession fullTextSession = Search.getFullTextSession( openSession() );
  Transaction tx = fullTextSession.beginTransaction();
  QueryParser parser = new QueryParser( "dept", TestConstants.standardAnalyzer );
  Query query = parser.parse( "dept:XXX" );
  org.hibernate.search.FullTextQuery hibQuery = fullTextSession.createFullTextQuery( query, Employee.class );
  ScrollableResults projections = hibQuery.scroll();
  projections.beforeFirst();
  projections.next();
  Object[] projection = projections.get();
  assertNull( projection );
  hibQuery = fullTextSession.createFullTextQuery( query, Employee.class ).setFirstResult( 10 ).setMaxResults( 20 );
  projections = hibQuery.scroll();
  projections.beforeFirst();
  projections.next();
  projection = projections.get();
  assertNull( projection );
  tx.commit();
  fullTextSession.close();
}

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

assertTrue( scrollableResults.last() );
assertEquals( 3, scrollableResults.getRowNumber() );
scrollableResults.beforeFirst();
assertTrue( scrollableResults.last() );
assertEquals( 1, scrollableResults.getRowNumber() );
scrollableResults.beforeFirst();

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

.setFetchSize( 10 )
  .scroll();
scrollableResults.beforeFirst();

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

@Test
public void testDefaultFetchSize() throws Exception {
  FullTextSession fullTextSession = Search.getFullTextSession( openSession() );
  Transaction tx = fullTextSession.beginTransaction();
  QueryParser parser = new QueryParser( "dept", TestConstants.standardAnalyzer );
  Query query = parser.parse( "dept:ITech" );
  org.hibernate.search.FullTextQuery hibQuery = fullTextSession.createFullTextQuery( query, Employee.class );
  hibQuery.setProjection( "id", "lastname", "dept" );
  ScrollableResults projections = hibQuery.scroll();
  projections.beforeFirst();
  Object[] projection = projections.get();
  assertNull( projection );
  projections.next();
  assertTrue( projections.isFirst() );
  tx.commit();
  fullTextSession.close();
}

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

@Test
public void testFetchSizeNonDefaultFirstAndMaxNoHits() throws Exception {
  FullTextSession fullTextSession = Search.getFullTextSession( openSession() );
  Transaction tx = fullTextSession.beginTransaction();
  QueryParser parser = new QueryParser( "dept", TestConstants.standardAnalyzer );
  Query query = parser.parse( "dept:XXX" );
  org.hibernate.search.FullTextQuery hibQuery = fullTextSession.createFullTextQuery( query, Employee.class );
  hibQuery.setProjection( "id", "lastname", "dept" );
  hibQuery.setFetchSize( 3 );
  hibQuery.setFirstResult( 1 );
  hibQuery.setMaxResults( 3 );
  ScrollableResults results = hibQuery.scroll();
  results.beforeFirst();
  Object[] result = results.get();
  assertNull( "non-null entity infos returned", result );
  tx.commit();
  fullTextSession.close();
}

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

assertTrue( scrollableResults.last() );
assertEquals( 110, scrollableResults.getRowNumber() );
scrollableResults.beforeFirst();
int position = scrollableResults.getRowNumber();
while ( scrollableResults.next() ) {

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

assertNotNull( projections );
projections.beforeFirst();
projections.next();
Object[] projection = projections.get();

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

@Test
public void testFetchSizeLargerThanHits() throws Exception {
  FullTextSession fullTextSession = Search.getFullTextSession( openSession() );
  Transaction tx = fullTextSession.beginTransaction();
  QueryParser parser = new QueryParser( "dept", TestConstants.standardAnalyzer );
  Query query = parser.parse( "dept:ITech" );
  org.hibernate.search.FullTextQuery hibQuery = fullTextSession.createFullTextQuery( query, Employee.class );
  hibQuery.setSort( new Sort( new SortField( "id", SortField.Type.STRING ) ) );
  hibQuery.setProjection( "id", "lastname", "dept" );
  hibQuery.setFetchSize( 6 );
  ScrollableResults results = hibQuery.scroll();
  results.beforeFirst();
  results.next();
  Object[] result = results.get();
  assertEquals( "incorrect entityInfo returned", 1000, result[0] );
  tx.commit();
  fullTextSession.close();
}

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

scrollableResults.last();
assertEquals( 132, scrollableResults.getRowNumber() );
scrollableResults.beforeFirst();
assertEquals( -1, scrollableResults.getRowNumber() );
int position = scrollableResults.getRowNumber();

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

@Test
public void testScrollableResultSet() throws Exception {
  FullTextSession fullTextSession = Search.getFullTextSession( openSession() );
  Transaction tx = fullTextSession.beginTransaction();
  QueryParser parser = new QueryParser( "title", TestConstants.stopAnalyzer );
  Query query = parser.parse( "summary:noword" );
  org.hibernate.query.Query hibQuery = fullTextSession.createFullTextQuery( query, Clock.class, Book.class );
  ScrollableResults result = hibQuery.scroll();
  assertNotNull( result );
  assertEquals( -1, result.getRowNumber() );
  assertEquals( false, result.next() );
  result.close();
  query = parser.parse( "summary:Festina Or brand:Seiko" );
  hibQuery = fullTextSession.createFullTextQuery( query, Clock.class, Book.class );
  result = hibQuery.scroll();
  assertEquals( -1, result.getRowNumber() );
  result.beforeFirst();
  assertEquals( true, result.next() );
  assertTrue( result.isFirst() );
  assertTrue( result.scroll( 1 ) );
  assertTrue( result.isLast() );
  assertFalse( result.scroll( 1 ) );
  tx.commit();
  fullTextSession.close();
}

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

@Test
public void testFetchSizeDefaultFirstAndMax() throws Exception {
  FullTextSession fullTextSession = Search.getFullTextSession( openSession() );
  Transaction tx = fullTextSession.beginTransaction();
  QueryParser parser = new QueryParser( "dept", TestConstants.standardAnalyzer );
  Query query = parser.parse( "dept:ITech" );
  org.hibernate.search.FullTextQuery hibQuery = fullTextSession.createFullTextQuery( query, Employee.class );
  hibQuery.setSort( new Sort( new SortField( "id", SortField.Type.STRING ) ) );
  hibQuery.setProjection( "id", "lastname", "dept" );
  hibQuery.setFetchSize( 3 );
  ScrollableResults results = hibQuery.scroll();
  results.beforeFirst();
  results.next();
  Object[] result = results.get();
  assertEquals( "incorrect entityInfo returned", 1000, result[0] );
  results.scroll( 2 );
  result = results.get();
  assertEquals( "incorrect entityInfo returned", 1003, result[0] );
  // check cache addition
  results.next();
  result = results.get();
  assertEquals( "incorrect entityInfo returned", 1004, result[0] );
  results.scroll( -2 );
  result = results.get();
  assertEquals( "incorrect entityInfo returned", 1002, result[0] );
  tx.commit();
  fullTextSession.close();
}

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

results.beforeFirst();
results.next();
Object[] result = results.get();

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

projections.beforeFirst();
projections.next();
Object[] projection = projections.get();

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

results.beforeFirst();
results.next();
assertTrue( "beforeFirst() pointer incorrect", results.isFirst() );

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