69 lines
2.6 KiB
C++
69 lines
2.6 KiB
C++
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#include <sqlite_orm/sqlite_orm.h>
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#include <iostream>
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#include <algorithm>
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using std::cout;
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using std::endl;
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struct MarvelHero {
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int id;
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std::string name;
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std::string abilities;
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};
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int main(int, char**) {
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using namespace sqlite_orm;
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auto storage = make_storage("iteration.sqlite",
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make_table("marvel",
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make_column("id", &MarvelHero::id, primary_key()),
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make_column("name", &MarvelHero::name),
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make_column("abilities", &MarvelHero::abilities)));
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storage.sync_schema();
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storage.remove_all<MarvelHero>();
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// insert values..
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storage.insert(MarvelHero{-1, "Tony Stark", "Iron man, playboy, billionaire, philanthropist"});
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storage.insert(MarvelHero{-1, "Thor", "Storm god"});
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storage.insert(MarvelHero{-1, "Vision", "Min Stone"});
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storage.insert(MarvelHero{-1, "Captain America", "Vibranium shield"});
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storage.insert(MarvelHero{-1, "Hulk", "Strength"});
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storage.insert(MarvelHero{-1, "Star Lord", "Humor"});
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storage.insert(MarvelHero{-1, "Peter Parker", "Spiderman"});
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storage.insert(MarvelHero{-1, "Clint Barton", "Hawkeye"});
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storage.insert(MarvelHero{-1, "Natasha Romanoff", "Black widow"});
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storage.insert(MarvelHero{-1, "Groot", "I am Groot!"});
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cout << "Heros count = " << storage.count<MarvelHero>() << endl;
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// iterate through heros - iteration takes less memory than `get_all` because
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// iteration fetches row by row once it is needed. If you break at any iteration
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// statement will be cleared without fetching remaining rows.
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for(auto& hero: storage.iterate<MarvelHero>()) {
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cout << "hero = " << storage.dump(hero) << endl;
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}
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cout << "====" << endl;
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// one can iterate with custom WHERE conditions..
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for(auto& hero: storage.iterate<MarvelHero>(where(c(&MarvelHero::name) == "Thor"))) {
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cout << "hero = " << storage.dump(hero) << endl;
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}
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cout << "Heros with LENGTH(name) < 6 :" << endl;
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for(auto& hero: storage.iterate<MarvelHero>(where(length(&MarvelHero::name) < 6))) {
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cout << "hero = " << storage.dump(hero) << endl;
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}
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std::vector<MarvelHero> heroesByAlgorithm;
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heroesByAlgorithm.reserve(static_cast<size_t>(storage.count<MarvelHero>()));
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{
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auto view = storage.iterate<MarvelHero>();
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std::copy(view.begin(), view.end(), std::back_inserter(heroesByAlgorithm));
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}
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cout << "heroesByAlgorithm.size = " << heroesByAlgorithm.size() << endl;
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return 0;
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}
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