UCS/sqlite_orm: ❤️ SQLite ORM light header only library for modern C++

examples/collate.cpp
65 строк2 KB
fnc12
added comments and #ifdef for expanded sql
11 дек 2019, 19:44
11 дек 2019, 19:44de7c9cd
#include <ctime>

#include <string>
#include <iostream>

#include <sqlite_orm/sqlite_orm.h>

using std::cout;
using std::endl;

struct User {
    int id;
    std::string name;
    time_t createdAt;
};

struct Foo {
    std::string text;
    int baz;
};

int main(int, char **) {

    using namespace sqlite_orm;
    auto storage = make_storage(
        "collate.sqlite",
        make_table("users",
                   make_column("id", &User::id, primary_key()),
                   make_column("name", &User::name),
                   make_column("created_at", &User::createdAt)),
        make_table("foo", make_column("text", &Foo::text, collate_nocase()), make_column("baz", &Foo::baz)));
    storage.sync_schema();
    storage.remove_all<User>();
    storage.remove_all<Foo>();

    storage.insert(User{0, "Lil Kim", time(nullptr)});
    storage.insert(User{0, "lil kim", time(nullptr)});
    storage.insert(User{0, "Nicki Minaj", time(nullptr)});

    //  SELECT COUNT(*)
    //  FROM users
    //  WHERE name = 'lil kim'
    auto preciseLilKimsCount = storage.count<User>(where(is_equal(&User::name, "lil kim")));
    cout << "preciseLilKimsCount = " << preciseLilKimsCount << endl;

    //  SELECT COUNT(*) FROM users WHERE name = 'lil kim' COLLATE NOCASE
    auto nocaseCount = storage.count<User>(where(is_equal(&User::name, "lil kim").collate_nocase()));
    cout << "nocaseCount = " << nocaseCount << endl;

    //  SELECT COUNT(*) FROM users
    cout << "total users count = " << storage.count<User>() << endl;

    storage.insert(Foo{"Touch", 10});
    storage.insert(Foo{"touch", 20});

    cout << "foo count = " << storage.count<Foo>(where(c(&Foo::text) == "touch")) << endl;

    //  SELECT id
    //  FROM users
    //  ORDER BY name COLLATE RTRIM ASC
    auto rows = storage.select(&User::id, order_by(&User::name).collate_rtrim().asc());
    cout << "rows count = " << rows.size() << endl;

    return 0;
}