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/*************************************************************************************************
* Example for typical usage of the polymorphic secondary index
*
* Copyright 2020 Google LLC
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of the License at
* https://www.apache.org/licenses/LICENSE-2.0
* Unless required by applicable law or agreed to in writing, software distributed under the
* License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
* either express or implied. See the License for the specific language governing permissions
* and limitations under the License.
*************************************************************************************************/
#include <map>
#include <string>
#include <vector>
#include "tkrzw_index.h"
// All symbols of Tkrzw are under the namespace "tkrzw".
using namespace tkrzw;
// Main routine.
int main(int argc, char** argv) {
// Opens the database.
PolyIndex index;
const std::map<std::string, std::string> open_params = {{"num_buckets", "100"}};
index.Open("casket.tkt", true, File::OPEN_TRUNCATE, open_params).OrDie();
// Adds records to the index.
// The key is a division name and the value is person name.
index.Add("general", "anne").OrDie();
index.Add("general", "matthew").OrDie();
index.Add("general", "marilla").OrDie();
index.Add("sales", "gilbert").OrDie();
// Anne moves to the sales division.
index.Remove("general", "anne").OrDie();
index.Add("sales", "anne").OrDie();
// Prints all members for each division.
const std::vector<std::string> divisions = {"general", "sales"};
for (const auto& division : divisions) {
std::cout << division << std::endl;
const std::vector<std::string>& members = index.GetValues(division);
for (const auto& member : members) {
std::cout << " -- " + member << std::endl;
}
}
// Prints every record by iterator.
std::unique_ptr<PolyIndex::Iterator> iter = index.MakeIterator();
iter->First();
std::string key, value;
while (iter->Get(&key, &value)) {
std::cout << key << ": " << value << std::endl;
iter->Next();
}
// Closes the index
index.Close().OrDie();
return 0;
}
// END OF FILE
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