std::unique_ptr<SQLiteIDBCursor> SQLiteIDBCursor::maybeCreate(SQLiteIDBTransaction* transaction, const IDBIdentifier& cursorIdentifier, int64_t objectStoreID, int64_t indexID, IndexedDB::CursorDirection cursorDirection, IndexedDB::CursorType cursorType, IDBDatabaseBackend::TaskType taskType, const IDBKeyRangeData& keyRange)
{
auto cursor = std::unique_ptr<SQLiteIDBCursor>(new SQLiteIDBCursor(transaction, cursorIdentifier, objectStoreID, indexID, cursorDirection, cursorType, taskType, keyRange));
if (!cursor->establishStatement())
return nullptr;
if (!cursor->advance(1))
return nullptr;
return cursor;
}
std::unique_ptr<SQLiteIDBCursor> SQLiteIDBCursor::maybeCreate(SQLiteIDBTransaction& transaction, const IDBCursorInfo& info)
{
auto cursor = std::make_unique<SQLiteIDBCursor>(transaction, info);
if (!cursor->establishStatement())
return nullptr;
if (!cursor->advance(1))
return nullptr;
return cursor;
}
std::unique_ptr<SQLiteIDBCursor> SQLiteIDBCursor::maybeCreateBackingStoreCursor(SQLiteIDBTransaction& transaction, const uint64_t objectStoreID, const uint64_t indexID, const IDBKeyRangeData& range)
{
auto cursor = std::make_unique<SQLiteIDBCursor>(transaction, objectStoreID, indexID, range);
if (!cursor->establishStatement())
return nullptr;
if (!cursor->advance(1))
return nullptr;
return cursor;
}
void SQLiteIDBCursor::resetAndRebindStatement()
{
ASSERT(!m_currentLowerKey.isNull());
ASSERT(!m_currentUpperKey.isNull());
ASSERT(m_transaction->sqliteTransaction());
ASSERT(m_statement);
ASSERT(m_statementNeedsReset);
m_statementNeedsReset = false;
// If this cursor never fetched any records, we don't need to reset the statement.
if (m_currentKey.isNull())
return;
// Otherwise update the lower key or upper key used for the cursor range.
// This is so the cursor can pick up where we left off.
// We might also have to change the statement from closed to open so we don't refetch the current key a second time.
if (m_cursorDirection == IndexedDB::CursorDirection::Next || m_cursorDirection == IndexedDB::CursorDirection::NextNoDuplicate) {
m_currentLowerKey = m_currentKey;
if (!m_keyRange.lowerOpen) {
m_keyRange.lowerOpen = true;
m_keyRange.lowerKey = m_currentLowerKey;
m_statement = nullptr;
}
} else {
m_currentUpperKey = m_currentKey;
if (!m_keyRange.upperOpen) {
m_keyRange.upperOpen = true;
m_keyRange.upperKey = m_currentUpperKey;
m_statement = nullptr;
}
}
if (!m_statement && !establishStatement()) {
LOG_ERROR("Unable to establish new statement for cursor iteration");
return;
}
if (m_statement->reset() != SQLITE_OK) {
LOG_ERROR("Could not reset cursor statement to respond to object store changes");
return;
}
bindArguments();
}