Description

Connection related types.

Classes
class	ozo::connection< OidMap, Statistics >
	Default model for `Connection` concept. More...

struct	ozo::is_connection< typename, typename >
	Connection indicator. More...

struct	ozo::get_connection_type< ConnectionProvider >
	Connection type getter More...

class	ozo::connection_info< OidMap, Statistics >
	Connection source to a single host. More...

struct	ozo::connection_pool_config
	Connection pool configuration. More...

struct	ozo::connection_pool_timeouts
	[[DEPRECATED]] Timeouts for the ozo::get_connection() operation More...

struct	ozo::connection_traits< Rep >
	Connection traits depend on a representation type. More...

class	ozo::pooled_connection< Rep, Executor >
	Pool bound model for `Connection` concept. More...

class	ozo::connection_pool< Source, ThreadSafety >
	Connection pool implementation. More...

class	ozo::connection_provider< ConnectionSource >
	Default model for the `ConnectionProvider` concept. More...

Types
template<typename T >
using	ozo::connection_type = typename get_connection_type< std::decay_t< T > >::type
	The connection object type that `ConnectionProvider` or `ConnectionSource` provide. More...

Enumerations
enum	ozo::transaction_status
	Transaction status of a `Connection` More...

Types

template<typename T >

using ozo::connection_type = typedef typename get_connection_type<std::decay_t<T> >::type

The connection object type that ConnectionProvider or ConnectionSource provide.

This type alias can be used to determine exact type of a connection object which can be obtained from a ConnectionSource or ConnectionProvider. It uses ozo::get_connection_type metafunction to get a Connection type.

Template Parameters

T	- `ConnectionSource` or `ConnectionProvider` type.

strong

Transaction status of a Connection

Indicates current transaction status of a Connection object. It reflects (but not equal!) libpq PGTransactionStatusType.

Note: In case of developing own connection pool, it must be taking in account what Connection can be reused only with ozo::transaction_status::idle status, in case of the other status the Connection shall be closed rather than collected back into the pool.

Enumerator
unknown	transaction state is unknown due to bad or invalid connection object, reflects `PQTRANS_UNKNOWN`
idle	connection is in idle state and can be reused, reflects `QTRANS_IDLE`
active	command execution is in progress, reflects `PQTRANS_ACTIVE`
transaction	idle, but within transaction block, reflects `PQTRANS_INTRANS`
error	idle, within failed transaction, reflects `PQTRANS_INERROR`