本文整理汇总了C++中Relation::attributes方法的典型用法代码示例。如果您正苦于以下问题:C++ Relation::attributes方法的具体用法?C++ Relation::attributes怎么用?C++ Relation::attributes使用的例子?那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类Relation
的用法示例。
在下文中一共展示了Relation::attributes方法的1个代码示例,这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞,您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: evaluateRules
void RDBMSInterpreter::evaluateRules(const vector<Rule*>& rules)
{
for(Rule* rule : rules)
{
queue<Relation> intermediate;
Relation outputRelation;
for(Predicate* predicate : rule->predicates())
{
map<string,Relation>::iterator it = m_relations.find(predicate->id());
if(it != m_relations.end())
{
outputRelation = (*it).second;
bool hasFree;
outputRelation = outputRelation.performQuery(*predicate, hasFree);
intermediate.push(outputRelation);
}
}
outputRelation = intermediate.front();
intermediate.pop();
while (!intermediate.empty())
{
outputRelation = outputRelation.join(intermediate.front());
intermediate.pop();
}
outputRelation = outputRelation.project(rule->headPredicate().parameters());
outputRelation.setName(rule->headPredicate().id());
map<string,Relation>::iterator it = m_relations.find(outputRelation.name());
if(it != m_relations.end())
{
Relation original = (*it).second ;
original = original.rename(original.attributes() , rule->headPredicate().parameters());
outputRelation = original.unionR(outputRelation);
m_relations[outputRelation.name()] = outputRelation;
}
}
}