of determining the return type from an expression
as well as the adaptation of the Python operator into
a SQL operator, based on the full left/right/operator
of the given expression. In particular
the date/time/interval system created for Postgresql
EXTRACT in [ticket:1647] has now been generalized into
the type system. The previous behavior which often
occured of an expression "column + literal" forcing
the type of "literal" to be the same as that of "column"
will now usually not occur - the type of
"literal" is first derived from the Python type of the
literal, assuming standard native Python types + date
types, before falling back to that of the known type
on the other side of the expression. Also part
of [ticket:1683].
This will cause the DATE and TIMESTAMP types to skip
all bind parameter and result row processing, under
the assumption that PARSE_DECLTYPES has been enabled
on the connection. Note that this is not entirely
compatible with the "func.current_date()", which
will be returned as a string. [ticket:1685]
which accepts keywords that affect how the statement
is executed w.r.t. the DBAPI. Currently supports
"stream_results", causes psycopg2 to use a server
side cursor for that statement. Can also be set
upon select() and text() constructs directly as well
as ORM Query().
produces BLOB, BYTEA, or a similar "long binary" type.
New base BINARY and VARBINARY
types have been added to access these MySQL/MS-SQL specific
types in an agnostic way [ticket:1664].
only the DAY TO SECOND interval type so far due to lack
of support in cx_oracle for YEAR TO MONTH. [ticket:1467]
- The Interval type includes a "native" flag which controls
if native INTERVAL types (postgresql + oracle) are selected
if available, or not. "day_precision" and "second_precision"
arguments are also added which propagate as appropriately
to these native types. Related to [ticket:1467].
- DefaultDialect.type_descriptor moves back to being per-dialect.
TypeEngine/TypeDecorator key type impls to the dialect class
+ server_version_info so that the colspecs dict can be modified
per-dialect based on server version.
- Fixed TypeDecorator's incorrect usage of _impl_dict
test user has DBA privs, and all objects can be created /dropped.
- added ORDER BY to oracle column listing
- Oracle all_tables always limits to current user if schema not given.
- views reflect - added documentation + a unit test for this.
- Table(autoload) with no bind produces an error message specific to
the fact that autoload_with should be the first option to try.
passed to the resulting statement. Currently only
Select-statements have these options, and the only option
used is "stream_results", and the only dialect which knows
"stream_results" is psycopg2.
- Query.yield_per() will set the "stream_results" statement
option automatically.
- Added "statement_options()" to Selects, which set statement
specific options. These enable e.g. dialect specific options
such as whether to enable using server side cursors, etc.
- The psycopg2 now respects the statement option
"stream_results". This option overrides the connection setting
"server_side_cursors". If true, server side cursors will be
used for the statement. If false, they will not be used, even
if "server_side_cursors" is true on the
connection. [ticket:1619]
- added a "frozendict" from http://code.activestate.com/recipes/414283/,
adding more default collections as immutable class vars on
Query, Insert, Select
applies the SQLite keyword "AUTOINCREMENT" to columns within DDL -
will prevent generation of a separate PRIMARY KEY constraint.
[ticket:1016]
- added docs
- fixed underlines in mysql.rst
"nullable=False" is not passed to Column(), and no default
is present. This is now consistent with all other types,
and in the case of TIMESTAMP explictly renders "NULL"
due to MySQL's "switching" of default nullability
for TIMESTAMP columns. [ticket:1539]
have native boolean support, will generate a CHECK
constraint "col IN (0, 1)" along with the int/smallint-
based column type. This can be switched off if
desired with create_constraint=False.
Note that MySQL has no native boolean *or* CHECK constraint
support so this feature isn't available on that platform.
[ticket:1589]
Uses a straight CheckConstraint with a generic expression. Preparing for boolean
constraint in [ticket:1589]
- CheckConstraint now accepts SQL expressions, though support for quoting of values
will be very limited. we don't want to get into formatting dates and such.
an error before passing to MySQL. Doesn't impact
CAST since VARCHAR is not allowed in MySQL CAST anyway,
the dialect renders CHAR/NCHAR in those cases.
[ticket:1252]
types to more intelligently determine float() vs. Decimal(),
[ticket:1567]
- since result processing is a hot issue of late, the DBAPI type
returned from cursor.description is certainly useful in cases like
these to determine an efficient result processor. There's likely
other result processors that can make use of it. But, backwards
incompat change to result_processor(). Happy major version number..
corresponding to the argument that PG accepts.
- Added support for reflecting the INTERVAL YEAR TO MONTH
and INTERVAL DAY TO SECOND syntaxes of the INTERVAL
type. [ticket:460]
on all new connections, which allows all String/Text/etc.
types to skip the need to post-process bytestrings into
unicode (an expensive step due to its volume). Other
dialects which return unicode natively (pg8000, zxjdbc)
also skip unicode post-processing.
- String/Text/Unicode types now skip the unicode() check
on each result column value if the dialect has
detected the DBAPI as returning Python unicode objects
natively. This check is issued on first connect
using "SELECT CAST 'some text' AS VARCHAR(10)" or
equivalent, then checking if the returned object
is a Python unicode. This allows vast performance
increases for native-unicode DBAPIs, including
pysqlite/sqlite3, psycopg2, and pg8000.
construct and extends the generic Enum type. Automatically
associates itself with tables and their parent metadata
to issue the appropriate CREATE TYPE/DROP TYPE
commands as needed, supports unicode labels, supports
reflection. [ticket:1511]
- MySQL ENUM now subclasses the new generic Enum type, and also handles
unicode values implicitly, if the given labelnames are unicode
objects.
- Added a new Enum generic type, currently supported on
Postgresql and MySQL. Enum is a schema-aware object
to support databases which require specific DDL in
order to use enum or equivalent; in the case of PG
it handles the details of `CREATE TYPE`, and on
other databases without native enum support can
support generation of CHECK constraints.
[ticket:1109] [ticket:1511]
- types documentation updates
- some cleanup on schema/expression docs
Implicit identities in mssql work the same as implicit sequences on any
other dialects. Explicit sequences are enabled through the use of
"default=Sequence()". See the MSSQL dialect documentation for more
information.
Michael Trier