#include <nontransaction.hxx>
Inheritance diagram for pqxx::nontransaction:
Public Member Functions | |
| nontransaction (connection_base &C, const PGSTD::string &NName=PGSTD::string()) | |
| Constructor. | |
| virtual | ~nontransaction () |
nontransaction, like transaction or any other transaction_base-derived class, provides access to a database through a connection. Unlike its siblings, however, nontransaction does not maintain any kind of transactional integrity. This may be useful eg. for read-only access to the database that does not require a consistent, atomic view on its data; or for operations that are not allowed within a backend transaction, such as creating tables. For queries that update the database, however, a real transaction is likely to be faster unless the transaction consists of only a single record update. As a side effect, you can keep a nontransaction open for as long as you like. Actual back-end transactions are limited in lifespan, and will sometimes fail just because they took too long to execute. This will not happen with a nontransaction. It may need to restore its connection, but it won't abort as a result.
Any query executed in a nontransaction is committed immediately, and neither Commit() nor Abort() has any effect.
Database features that require a backend transaction, such as cursors or large objects, will not work in a nontransaction.
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Constructor. Create a "dummy" transaction.
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1.3.9.1