Introduce ReplicationConnection and ReplicationCursor classes, that
incapsulate initiation of special type of PostgreSQL connection and
handling of special replication commands only available in this special
connection mode.
The handling of stream of replication data from the server is modelled
largely after the existing support for "COPY table TO file" command and
pg_recvlogical tool supplied with PostgreSQL (though, it can also be
used for physical replication.)
Calls PQconninfoParse to parse the dsn into a list of keyword and value
structs, then constructs a dictionary from that. Can be useful when one
needs to alter some part of the the connection string reliably, but
doesn't want to get into all the details of parsing a dsn string:
quoting, URL format, etc.
This is for people using dtuple.py; a dtuple.DatabaseTuple instance
keeps a reference to cursor.description, which is not picklable because
psycopg2 doesn't export the Column namedtuple it uses.
This commit exports the Column namedtuple, and includes a test to verify
the pickle/unpickle works after exporting Column.
This matches postgres server-side behaviour and helps client applications that need to sort based on the primary key of tables where the primary key is or contains a range.
The implementation is based on psycopg 2.4, which should be less broken
(zope-wise) of the current one.
Instantiating psycopg2.pool.PersistentConnectionPool now raises a warning.
This should fix ticket #123, #125. The issue of the reset on
set_client_encoding() is still present but that's always been there and I'm no
good at fixing it.
TypeError is the standard Python error raised in this case:
$ python -c "(lambda a: None)(b=10)"
TypeError: <lambda>() got an unexpected keyword argument 'b'
We only used to raise InterfaceError when connect was used without
any parameter at all, so it's hard to think a program depending on
that design. Furthermore the function has always raised (and still
does) OperationalError too, if the bad argument is detected by the
libpq, and that cannot be changed because we can't tell the
difference from a normal connection error.
We don't need to look for stuff implicitly into pg_catalog as all
the builtin ranges are already registered. So just search into
'public' if the schema is not specified.
I was avoiding Numeric to avoid conflicting with the 'numeric'
Postgres type, which is an alias for 'decimal'. But now that there
is a single numeric range I can use the preferred name
Makes things more natural as _make has the same signature of the tuple (see
_ctor in CompositeCaster) and is probably more efficient with less
intermediate sequences to build.
Pass a dumps function instead. Allow customizing by either arg passing or
subclassing.
The basic Json class now raises ImportError on getquoted() if json is not
available, thus allowing using a customized Json subclass even when the json
module is not available.
Methods execute() and callproc() in DictCursor and RealDictCursor should
call DictCursorBase methods, not _cursor's ones.
Reported by Alexey Luchko on the ML.
Prior to this change, using a extras.connection_factory would not allow
any other cursor to be used on that connection. It was set in stone.
This change allows all cursor options to pass through and override the
connection factory behaviors. This allows a connection_factory to be
dropped into existing code with no disruption.
This change also standardizes the extras.connection_factories to have
the same behavior and all pass through *args and **kwargs.
The correction is similar to the other one for the other subclasses.
Also added tests for rowcount and rownumber during different fetch styles.
Just in case.
Regression introduced to fix ticket #80. Don't use fetchmany to get the
chunks of values. I did it that way because I was ending up into infinite
recursion calling __iter__ from __iter__: the solution has been the
"while 1: yield next()" idiom.
Avoid creating new a new FixedOffsetTimezone instance if one with the
same offset and name has been created before. This will save memory
when returning many rows containing "timestamp with timezone" columns,
and also improves comparability.
The offset displayed was always positive and somewhat confusing. The
offset displayed now is the offset that the instance was created
with.
Also added some tests for initialisation.
