# query_context

A fluent sql query_context builder

Object definition
```cpp
struct airplane
{
  unsigned long id;
  std::string brand;
  std::string model;

  template<class Operator>
  void process(Operator &op) {
    namespace field = matador::utils::access;
    field::primary_key(op, "id", id);
    field::attribute(op, "brand", brand, 255);
    field::attribute(op, "model", model, 255);
  }
};
```
```cpp
connection_pool<connection> pool("sqlite://sqlite.db", 4);
session s(pool);

// register entity
s.attach<airplane>("airplane")

// create all tables
s.create();

// insert
s.insert<airplane>(1, "Airbus", "A380");
s.insert<airplane>(2, "Boeing", "748");
s.insert<airplane>(3, "Boeing", "707");

s.update<airplane>().set({"model", "747"}).where("id"_col == 2);

auto result = s.select<airplane>().where("brand"_col == "Boeing");

for (const auto &plane : result) {
  std::cout << "airplane: " << plane->brand << " - " << plane->model << "\n";
}

```