本文整理了Java中org.apache.openjpa.kernel.QueryImpl.singleResult方法的一些代码示例，展示了QueryImpl.singleResult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。QueryImpl.singleResult方法的具体详情如下：
包路径：org.apache.openjpa.kernel.QueryImpl
类名称：QueryImpl
方法名：singleResult

QueryImpl.singleResult介绍

[英]Extract an expected single result from the given provider. Used when the result is an ungrouped aggregate or the unique flag is set to true.
[中]从给定的提供程序中提取预期的单个结果。当结果是未分组的聚合或unique标志设置为true时使用。

代码示例

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

/**
 * Return the query result for the given result object provider.
 */
protected Object toResult(StoreQuery q, StoreQuery.Executor ex, 
  ResultObjectProvider rop, StoreQuery.Range range)
  throws Exception {
  // pack projections if necessary
  String[] aliases = ex.getProjectionAliases(q);
  if (!ex.isPacking(q)) {
    ResultPacker packer = getResultPacker(q, ex);
    if (packer != null || aliases.length == 1)
      rop = new PackingResultObjectProvider(rop, packer,
        aliases.length);
  }
  // if single result, extract it
  if (_unique == Boolean.TRUE || (aliases.length > 0
    && !ex.hasGrouping(q) && ex.isAggregate(q)))
    return singleResult(rop, range);
  // now that we've executed the query, we can call isAggregate and
  // hasGrouping efficiently
  boolean detach = (_broker.getAutoDetach() &
    AutoDetach.DETACH_NONTXREAD) > 0 && !_broker.isActive();
  boolean lrs = range.lrs && !ex.isAggregate(q) && !ex.hasGrouping(q);
  ResultList res = (!detach && lrs) ? _fc.newResultList(rop)
    : new EagerResultList(rop);
  _resultLists.add(decorateResultList(res));
  return res;
}

代码示例来源：origin: org.apache.openejb.patch/openjpa