.c files only need to import psycopg.h: it will in turn import
dependencies from Python and libpq and configure.h. psycopg.h should be
the first to be imported, so the basic imports are not required in
the .h's
As a guideline I'm trying to import from the most specific to the most
generic to detect missing imports in the .h's.
Instead, the code should be using the fileno() and poll() methods of
the cursor's connection. Handle the case when poll() is called on an
already built connection as a request to poll the asynchronous query
(if there is one) and get NOTIFY events.
Update the tests to reflect that change, add a test for NOTIFY.
Without this a query that did not get flushed completely to the server
would cause cursor.poll() to always go into the curs_poll_send()
branch even if it was retuning ASYNC_READ.
Bug report by Daniele Varrazzo.
This hides from the user the libpq's implementation detail of
requiring the first select() to wait for the connection socket to
become writable and makes it possible to have a uniform select loop
for both cursors and connections, in which you always start by polling
the object and then acting according to the result from poll().
Idea and implementation by Daniele Varrazzo.
POLL_OK has been changed from 3 to 0 to let the user specify a short loop
just as "if not curs.poll()" instead of having to check for write and read
separately. For an example of this, see examples/notify.py.
The methods changed are connection.commit(), rollback(), reset(),
set_isolation_level(), set_client_encoding(), lobject(), cursor(str)
as well as cursor.execute() and cursor.callproc() if another query is
in progress and cursor.executemany(), cursor.copy_{from,to,expert)().
Clients using async connections are expected to do their own
transaction management by sending (asynchronously) BEGIN and COMMIT
statements.
As a bonus, it allows to drop one step from the async connection
building, namely getting the default isolation level from the server.
The isread() API was not safe, because the query might have not been
sent fully to the server after calling execute(). To make the async
API complete, a similar mechanism to async connections must be used.
The cursor now has a poll() method that you would use identically to
the poll() method of the connection class.
After calling psycopg2.connect(dsn, async=True) you can poll the
connection that will tell you whether its file descriptor should be
waited on to become writable or readable or that the connection
attempt has succeeded.
Edited commit by Jan to not expose internal state in extensions.py.
that should not be exported from the module. This results in a 5%
reduction in code size and shortens the dynamic symbol table.
* psycopg/config.h: If GCC >= 4.0 is installed, define the HIDDEN
symbol to apply the "hidden" visibility attribute.
over some tests for serialisation and deadlock errors,
demonstrating that TransactionRollbackError is generated.
(QueryCancelationTests): add a test to show that
QueryCanceledError is raised on statement timeouts.
* psycopg2da/adapter.py (_handle_psycopg_exception): rather than
checking exception messages, check for TransactionRollbackError.
* psycopg/pqpath.c (exception_from_sqlstate): return
TransactionRollbackError for 40xxx errors, and QueryCanceledError
for 57014 errors.
(pq_raise): If we are using an old server, use
TransactionRollbackError if the error message contains "could not
serialize" or "deadlock detected".
* psycopg/psycopgmodule.c (_psyco_connect_fill_exc): remove
function, since we no longer need to store pointers to the
exceptions in the connection. This also fixes a reference leak.
(psyco_connect): remove _psyco_connect_fill_exc() function call.
* psycopg/connection.h (connectionObject): remove exception
members from struct.
* psycopg/connection_type.c (connectionObject_getsets): modify the
exception attributes on the connection object from members to
getsets. This reduces the size of the struct.
* lib/extensions.py: import the two new extensions.
* psycopg/psycopgmodule.c (exctable): add new QueryCanceledError
and TransactionRollbackError exceptions.
requiring it.
Added a connection flag to store whether E''-style quoting is required: this
avoids repeated PQparameterStatus() calls.
Added a test case to verify correct behavior on strings, unicode and binary
data. Tested with PG versions from 7.4 to 8.3b2, with any server
'standard_conforming_strings' setting and with 'PSYCOPG_OWN_QUOTING' too.
