Types

Description

Database requests related types.

Classes
class	ozo::cancel_handle< Executor >
	Cancel operation handle. More...
class	ozo::value
	Database request result value proxy. More...
class	ozo::row
	Database request result row proxy. More...
class	ozo::basic_result< T >
	Database raw result representation. More...

Types
using	ozo::shared_result = basic_result< pg::shared_result >
	Database raw result representation. More...
using	ozo::result = basic_result< pg::result >
	Database raw result representation. More...
template<typename ... Ts>
using	ozo::rows_of = std::vector< typed_row< Ts... > >
	Shortcut for easy result container definition. More...
template<typename ... Ts>
using	ozo::lrows_of = std::list< typed_row< Ts... > >
	Shortcut for easy result container definition. More...

Types

lrows_of

template<typename ... Ts>

using ozo::lrows_of = typedef std::list<typed_row<Ts...> >

Shortcut for easy result container definition.

This shortcut defines std::list container for row tuples.

Note

It is very important to keep a sequence of types according to fields in query statement (see the example below).

Example

// Query statement
const auto query =
    "SELECT        id     ,      name     FROM users_info WHERE amount>="_SQL + std::int64_t(25);
//                ----          ======
//                 V              V
ozo::lrows_of<std::int64_t, std::string> rows;
//            ------------  ===========
 
ozo::request(conn_info[io], query, ozo::into(rows), boost::asio::use_future);

Template Parameters

Ts	— types of columns in result

result

using ozo::result = typedef basic_result<pg::result>

Database raw result representation.

Stores raw request result. The result object is useful then it needs to get an access to raw data representation or the underlying libpq handle.

rows_of

template<typename ... Ts>

using ozo::rows_of = typedef std::vector<typed_row<Ts...> >

Shortcut for easy result container definition.

This shortcut defines std::vector container for row tuples.

Note

It is very important to keep a sequence of types according to fields in query statement (see the example below).

Example

// Query statement
const auto query =
    "SELECT        id    ,      name     FROM users_info WHERE amount>="_SQL + std::int64_t(25);
//                ----         ======
//                 V             V
ozo::rows_of<std::int64_t, std::string> rows;
//           ------------  ===========
 
ozo::request(conn_info[io], query, ozo::into(rows), boost::asio::use_future);

Template Parameters

Ts	— types of columns in result

shared_result

using ozo::shared_result = typedef basic_result<pg::shared_result>

Database raw result representation.

Copyable version of ozo::result. The result object is useful then it needs to get an access to raw data representation or the underlying libpq handle.

Get this type of result may be obtained from ozo::result:

ozo::result res;
//...
ozo::share_result shared_res(std::move(res));