问postgres连接池程序库

EN

class DbPool {
public:
    static db_handle_t create(const string &conn,
                              uint32_t max = DEFAULT_CON_MAX,
                              uint32_t min = DEFAULT_CON_MIN);

    static pqxx::result runQuery(db_handle_t pool,
                                 const string& query);

private:

    DbPool(const string& con, uint32_t max_cons,
           uint32_t min_cons);

    static boost::ptr_vector<DbPool> pool_;  // Keep a static vector of pools,

    pqxx::connection *createCon();
    void              releaseCon(pqxx::connection *c);
    uint32_t          initializeCons();
    pqxx::connection *getCon();

    boost::ptr_list<pqxx::connection> m_freeCons;

}