本文整理汇总了C++中TableIndex::moveToKey方法的典型用法代码示例。如果您正苦于以下问题：C++ TableIndex::moveToKey方法的具体用法？C++ TableIndex::moveToKey怎么用？C++ TableIndex::moveToKey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TableIndex的用法示例。
在下文中一共展示了TableIndex::moveToKey方法的3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: p_execute
//.........这里部分代码省略.........
VOLT_DEBUG("Initial Expression:\n%s", initial_expression->debug(true).c_str());
}
//
// SKIP NULL EXPRESSION
//
AbstractExpression* skipNullExpr = m_node->getSkipNullPredicate();
// For reverse scan edge case NULL values and forward scan underflow case.
if (skipNullExpr != NULL) {
skipNullExpr->substitute(params);
VOLT_DEBUG("COUNT NULL Expression:\n%s", skipNullExpr->debug(true).c_str());
}
ProgressMonitorProxy pmp(m_engine, targetTable);
//
// An index scan has three parts:
// (1) Lookup tuples using the search key
// (2) For each tuple that comes back, check whether the
// end_expression is false.
// If it is, then we stop scanning. Otherwise...
// (3) Check whether the tuple satisfies the post expression.
// If it does, then add it to the output table
//
// Use our search key to prime the index iterator
// Now loop through each tuple given to us by the iterator
//
TableTuple tuple;
if (activeNumOfSearchKeys > 0) {
VOLT_TRACE("INDEX_LOOKUP_TYPE(%d) m_numSearchkeys(%d) key:%s",
localLookupType, activeNumOfSearchKeys, searchKey.debugNoHeader().c_str());
if (localLookupType == INDEX_LOOKUP_TYPE_EQ) {
tableIndex->moveToKey(&searchKey);
}
else if (localLookupType == INDEX_LOOKUP_TYPE_GT) {
tableIndex->moveToGreaterThanKey(&searchKey);
}
else if (localLookupType == INDEX_LOOKUP_TYPE_GTE) {
tableIndex->moveToKeyOrGreater(&searchKey);
} else if (localLookupType == INDEX_LOOKUP_TYPE_LT) {
tableIndex->moveToLessThanKey(&searchKey);
} else if (localLookupType == INDEX_LOOKUP_TYPE_LTE) {
// find the entry whose key is greater than search key,
// do a forward scan using initialExpr to find the correct
// start point to do reverse scan
bool isEnd = tableIndex->moveToGreaterThanKey(&searchKey);
if (isEnd) {
tableIndex->moveToEnd(false);
} else {
while (!(tuple = tableIndex->nextValue()).isNullTuple()) {
pmp.countdownProgress();
if (initial_expression != NULL && !initial_expression->eval(&tuple, NULL).isTrue()) {
// just passed the first failed entry, so move 2 backward
tableIndex->moveToBeforePriorEntry();
break;
}
}
if (tuple.isNullTuple()) {
tableIndex->moveToEnd(false);
}
}
}
else {
return false;
}示例2: p_execute
//.........这里部分代码省略.........
AbstractExpression* initial_expression = m_node->getInitialExpression();
if (initial_expression != NULL) {
VOLT_DEBUG("Initial Expression:\n%s", initial_expression->debug(true).c_str());
}
//
// SKIP NULL EXPRESSION
//
AbstractExpression* skipNullExpr = m_node->getSkipNullPredicate();
// For reverse scan edge case NULL values and forward scan underflow case.
if (skipNullExpr != NULL) {
VOLT_DEBUG("COUNT NULL Expression:\n%s", skipNullExpr->debug(true).c_str());
}
//
// An index scan has three parts:
// (1) Lookup tuples using the search key
// (2) For each tuple that comes back, check whether the
// end_expression is false.
// If it is, then we stop scanning. Otherwise...
// (3) Check whether the tuple satisfies the post expression.
// If it does, then add it to the output table
//
// Use our search key to prime the index iterator
// Now loop through each tuple given to us by the iterator
//
TableTuple tuple;
if (activeNumOfSearchKeys > 0) {
VOLT_TRACE("INDEX_LOOKUP_TYPE(%d) m_numSearchkeys(%d) key:%s",
localLookupType, activeNumOfSearchKeys, searchKey.debugNoHeader().c_str());
if (localLookupType == INDEX_LOOKUP_TYPE_EQ) {
tableIndex->moveToKey(&searchKey, indexCursor);
}
else if (localLookupType == INDEX_LOOKUP_TYPE_GT) {
tableIndex->moveToGreaterThanKey(&searchKey, indexCursor);
}
else if (localLookupType == INDEX_LOOKUP_TYPE_GTE) {
tableIndex->moveToKeyOrGreater(&searchKey, indexCursor);
}
else if (localLookupType == INDEX_LOOKUP_TYPE_LT) {
tableIndex->moveToLessThanKey(&searchKey, indexCursor);
}
else if (localLookupType == INDEX_LOOKUP_TYPE_LTE) {
// find the entry whose key is greater than search key,
// do a forward scan using initialExpr to find the correct
// start point to do reverse scan
bool isEnd = tableIndex->moveToGreaterThanKey(&searchKey, indexCursor);
if (isEnd) {
tableIndex->moveToEnd(false, indexCursor);
}
else {
while (!(tuple = tableIndex->nextValue(indexCursor)).isNullTuple()) {
pmp.countdownProgress();
if (initial_expression != NULL && !initial_expression->eval(&tuple, NULL).isTrue()) {
// just passed the first failed entry, so move 2 backward
tableIndex->moveToBeforePriorEntry(indexCursor);
break;
}
}
if (tuple.isNullTuple()) {
tableIndex->moveToEnd(false, indexCursor);
}
}
}示例3: p_execute
//.........这里部分代码省略.........
localSortDirection = SORT_DIRECTION_TYPE_ASC;
}
}
// if a EQ comparison is out of range, then the tuple from
// the outer loop returns no matches (except left-outer)
else {
keyException = true;
}
break;
} // End catch block for under- or overflow when setting index key
} // End for each active search key
VOLT_TRACE("Searching %s", index_values.debug("").c_str());
// if a search value didn't fit into the targeted index key, skip this key
if (!keyException) {
//
// Our index scan on the inner table is going to have three parts:
// (1) Lookup tuples using the search key
//
// (2) For each tuple that comes back, check whether the
// end_expression is false. If it is, then we stop
// scanning. Otherwise...
//
// (3) Check whether the tuple satisfies the post expression.
// If it does, then add it to the output table
//
// Use our search key to prime the index iterator
// The loop through each tuple given to us by the iterator
//
// Essentially cut and pasted this if ladder from
// index scan executor
if (num_of_searchkeys > 0) {
if (localLookupType == INDEX_LOOKUP_TYPE_EQ) {
index->moveToKey(&index_values, indexCursor);
}
else if (localLookupType == INDEX_LOOKUP_TYPE_GT) {
index->moveToGreaterThanKey(&index_values, indexCursor);
}
else if (localLookupType == INDEX_LOOKUP_TYPE_GTE) {
index->moveToKeyOrGreater(&index_values, indexCursor);
}
else if (localLookupType == INDEX_LOOKUP_TYPE_LT) {
index->moveToLessThanKey(&index_values, indexCursor);
}
else if (localLookupType == INDEX_LOOKUP_TYPE_LTE) {
// find the entry whose key is greater than search key,
// do a forward scan using initialExpr to find the correct
// start point to do reverse scan
bool isEnd = index->moveToGreaterThanKey(&index_values, indexCursor);
if (isEnd) {
index->moveToEnd(false, indexCursor);
}
else {
while (!(inner_tuple = index->nextValue(indexCursor)).isNullTuple()) {
pmp.countdownProgress();
if (initial_expression != NULL && !initial_expression->eval(&outer_tuple, &inner_tuple).isTrue()) {
// just passed the first failed entry, so move 2 backward
index->moveToBeforePriorEntry(indexCursor);
break;
}
}
if (inner_tuple.isNullTuple()) {
index->moveToEnd(false, indexCursor);
}
}
}