C++ web框架：matt-42/lithium

一、代码示例

#include <lithium_http_server.hh>
#include <lithium_pgsql.hh>
#include "symbols.hh"

using namespace li;

int main() {
    // 创建 PostgreSQL 数据库连接
    pgsql_database db = pgsql_database(
        s::host = "localhost",
        s::database = "your_database",
        s::user = "your_username",
        s::password = "your_password",
        s::port = 5432
    );

    // 定义 ORM 模式
    auto schema = sql_orm_schema(db, "users")
        .fields(s::id = int(),
                s::name = std::string(),
                s::email = std::string());

    // 连接 ORM 模式
    auto users = schema.connect();

    // 定义 HTTP API
    http_api api;
    api.get("/users") = [&](http_request& req, http_response& res) {
        // 查询所有用户
        auto result = users(s::select = s::all);
        res.write(result);
    };

    api.post("/users") = [&](http_request& req, http_response& res) {
        // 创建新用户
        auto new_id = users.insert(s::name = req.get_parameter("name"),
                                    s::email = req.get_parameter("email"));
        res.write("User created with id: ", new_id);
    };

    api.get("/users/:id") = [&](http_request& req, http_response& res) {
        // 根据 ID 查询用户
        auto user = users.find_one(s::id = req.url_parameters().id);
        if (user) {
            res.write(*user);
        } else {
            res.write("User not found");
        }
    };

    api.put("/users/:id") = [&](http_request& req, http_response& res) {
        // 更新用户信息
        auto updated = users.update(s::id = req.url_parameters().id,
                                    s::name = req.get_parameter("name"),
                                    s::email = req.get_parameter("email"));
        res.write("User updated: ", updated);
    };

    api.delete("/users/:id") = [&](http_request& req, http_response& res) {
        // 删除用户
        auto deleted = users.remove(s::id = req.url_parameters().id);
        res.write("User deleted: ", deleted);
    };

    // 启动 HTTP 服务器
    http_serve(api, 8080);
}