C++ SQL ORM

 测试代码 

//
// Created by www on 2024/8/7.
//
#include "sqlitepp/database.h"
#include "sqlitepp/condition.h"

#include <iostream>
using namespace sqlitepp;
using namespace sqlitepp::literals;

enum class test_enum {
  hello
};

void testCondition() {

  std::string s;
  {
    // ==
    auto q = "t"_c == test_enum::hello;
    auto p = q.as_partial();
    std::cout << p.query << std::endl;
    std::holds_alternative<orm::db_integer_type>(p.params[0]);
  }

  {
    // !=
    auto q = "t"_c != test_enum::hello;
    auto p = q.as_partial();
    std::cout << p.query << std::endl;
  }

  {
    // NOT
    auto q = !("t"_c == "hello");
    auto p = q.as_partial();
    std::cout << p.query << std::endl;
  }

  {
    // is NULL
    auto q = "t"_c == nullptr;
    auto p = q.as_partial();
    std::cout << p.query << std::endl;
  }

  {
    // is NOT NULL
    auto q = "t"_c != nullptr;
    auto p = q.as_partial();
    std::cout << p.query << std::endl;
  }

  {
    // AND
    auto q = "t"_c == "hello" && "t2"_c == "test";
    auto p = q.as_partial();
    std::cout << p.query << std::endl;
  }

  {
    // OR
    auto q = "t"_c == "hello" || "t2"_c == "test";
    auto p = q.as_partial();
    std::cout << p.query << std::endl;
  }

  { // BETWEEN
    auto q = "t"_c.between(static_cast<int64_t>(10),static_cast<int64_t>(20));
    auto p = q.as_partial();
    std::cout << p.query << std::endl;
  }

  { // NOT BETWEEN
    auto q = "t"_c.not_between(static_cast<int64_t>(10),static_cast<int64_t>(20));
    auto p = q.as_partial();
    std::cout << p.query << std::endl;
  }

  {
    // LIKE
    auto q = "t"_c.like("test%");
    auto p = q.as_partial();
    std::cout << p.query << std::endl;
  }

  {
    // GLOB
    auto q = "t"_c.glob("test%");
    auto p = q.as_partial();
    std::cout << p.query << std::endl;
  }

  { // >
    auto q = "t"_c > static_cast<int64_t>(10);
    auto p = q.as_partial();
    std::cout << p.query << std::endl;
  }

  { // >
    auto q = "t"_c >= static_cast<int64_t>(10);
    auto p = q.as_partial();
    std::cout << p.query << std::endl;
  }

  { // >
    auto q = "t"_c < static_cast<int64_t>(10);
    auto p = q.as_partial();
    std::cout << p.query << std::endl;
  }

  { // >
    auto q = "t"_c <= static_cast<int64_t>(10);
    auto p = q.as_partial();
    std::cout << p.query << std::endl;
  }
}



#include "include/sqlitepp/database.h"
#include "include/sqlitepp/orm.h"

using namespace sqlitepp;
using namespace sqlitepp::orm;

struct my_entity : orm::entity {
  enum class e_test {
    hello = 10,
    hello2 = 20
  };
  e_test t {e_test::hello};
  std::optional<int64_t> test_optional {};

  using entity::entity;

  static const orm::class_info _class_info;
  const orm::class_info& get_class_info() const noexcept override { return _class_info; }
};

const orm::class_info my_entity::_class_info = orm::builder<my_entity>("e")
                                                   .field("t", &my_entity::t)
                                                   .field("test_optional", &my_entity::test_optional)
                                                   .build();

void testORM() {

   {  // ReadWriteEnum
    database db;
    my_entity e(db);
    auto& info = e.get_class_info();
    auto* field = info.get_field_by_name("t");

    auto val = field->getter(&e);
    std::cout << std::get<db_integer_type>(val) << std::endl;
    e.t = my_entity::e_test::hello2;
    val = field->getter(&e);
    std::cout << std::get<db_integer_type>(val) << std::endl;
    val = db_integer_type{10};
    field->setter(&e, val);
    std::cout << (int)e.t << std::endl;
  }

  { // ReadWriteOptional
    database db;
    my_entity e(db);
    auto& info = e.get_class_info();
    auto* field = info.get_field_by_name("test_optional");

    auto val = field->getter(&e);
    e.test_optional = 100;
    val = field->getter(&e);
    std::cout << std::get<db_integer_type>(val) << std::endl;

    val = db_integer_type{10};
    field->setter(&e, val);
    std::cout << e.test_optional.value() << std::endl;

    val = db_null_type{};
    field->setter(&e, val);
    std::cout << e.test_optional.has_value() << std::endl;
  }

  { // IsModified
    database db;
    my_entity e(db);
    auto& info = e.get_class_info();
    db.exec(generate_create_table(info));

    std::cout << (e.is_modified()) << std::endl;
    e.save();
    std::cout << (e.is_modified()) << std::endl;
    e.test_optional = 1337;
    std::cout << (e.is_modified()) << std::endl;
    e.save();
    std::cout << (e.is_modified()) << std::endl;

    e.test_optional.reset();
    std::cout << (e.is_modified()) << std::endl;
    e.reset();
    std::cout << (e.is_modified()) << std::endl;
    std::cout << e.test_optional.value() << std::endl;
  }

}

int main() {
  database db;
  testCondition();
  testORM();
  return 0;
}

输出

`t` = ?
`t` <> ?
 NOT (`t` = ?)
`t` IS NULL
`t` IS NOT NULL
(`t` = ?) AND (`t2` = ?)
(`t` = ?) OR (`t2` = ?)
`t` BETWEEN ? AND ?
`t` NOT BETWEEN ? AND ?
`t` LIKE ?
`t` GLOB ?
`t` > ?
`t` >= ?
`t` < ?
`t` <= ?
10
20
10
100
10
0
1
0
1
0
1
0
1337

参考

https://github.com/Thalhammer/sqlitepp

我去年买了个表/sqlite3

创作不易，小小的支持一下吧！