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Add support to ``FETCH {FIRST | NEXT} [ count ] {ROW | ROWS}
{ONLY | WITH TIES}`` in the select for the supported backends,
currently PostgreSQL, Oracle and MSSQL.
Fixes: #5576
Change-Id: Ibb5871a457c0555f82b37e354e7787d15575f1f7
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Change-Id: Id9ac0b45f0859199e7db61ef5d4fac956b74b2ba
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Provide support for multiple hosts in the PostgreSQL connection string.
A user requested for SQLAlchemy to support multiple hosts within a PostgreSQL URL string. The proposed fix allows this. In the event that the url contains multiple hosts the proposed code will convert the query["hosts"] tuple into a single string. This allows the hosts to then get converted into a valid dsn variable in the psycopg2 connect function.
This pull request is:
- [ ] A documentation / typographical error fix
- Good to go, no issue or tests are needed
- [X ] A short code fix
- please include the issue number, and create an issue if none exists, which
must include a complete example of the issue. one line code fixes without an
issue and demonstration will not be accepted.
- Please include: `Fixes: #<issue number>` in the commit message
- please include tests. one line code fixes without tests will not be accepted.
- [ ] A new feature implementation
- please include the issue number, and create an issue if none exists, which must
include a complete example of how the feature would look.
- Please include: `Fixes: #<issue number>` in the commit message
- please include tests.
**Have a nice day!**
Fixes: #4392
Closes: #5554
Pull-request: https://github.com/sqlalchemy/sqlalchemy/pull/5554
Pull-request-sha: 3f7a0ab8df9f1411a9f1ac0e152583bc7bf0c365
Change-Id: I3f3768d51b8331de786ffdc025b7ecfc662eafe5
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Added support for reflecting "identity" columns, which are now returned
as part of the structure returned by :meth:`_reflection.Inspector.get_columns`.
When reflecting full :class:`_schema.Table` objects, identity columns will
be represented using the :class:`_schema.Identity` construct.
Fixed compilation error on oracle for sequence and identity column
``nominvalue`` and ``nomaxvalue`` options that require no space in them.
Improved test compatibility with oracle 18.
As part of the support for reflecting :class:`_schema.Identity` objects,
the method :meth:`_reflection.Inspector.get_columns` no longer returns
``mssql_identity_start`` and ``mssql_identity_increment`` as part of the
``dialect_options``. Use the information in the ``identity`` key instead.
The mssql dialect will assume that at least MSSQL 2005 is used.
There is no hard exception raised if a previous version is detected,
but operations may fail for older versions.
Fixes: #5527
Fixes: #5324
Change-Id: If039fe637c46b424499e6bac54a2cbc0dc54cb57
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It's better, the majority of these changes look more readable to me.
also found some docstrings that had formatting / quoting issues.
Change-Id: I582a45fde3a5648b2f36bab96bad56881321899b
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Set default type codec for ``json`` and ``jsonb`` types when using
the asyncpg driver. By default asyncpg will not decode them and return
strings instead.
Fixes: #5584
Change-Id: I41348eff8096ccf87b952d7e797c0694c6c4b5c4
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This codec was used to ensure the "pg_attribute.generated"
column comes back as a string and not bytes, matching how
other PG drivers treat this datatype. However, this breaks
asyncpg's internal implementation of set_type_codec going forward
and the "char" datatype is actually a bytes in any case.
So at the moment it appears psycopg2/pg8000 are broken for mis-treatment
of the datatype and asyncpg is broken in that it was allowing
us to change a codec that it appears to rely upon internally.
Fixes: #5586
Change-Id: I937eba315904721aa4e2726b95432910a8affe5f
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The server_side_cursors engine-wide feature relies upon
regexp parsing of statements a well as general guessing as
to when the feature should be used. This is not within the
2.0 way of doing things and should be removed.
Additionally, mariadbconnector defaults to unbuffered cursors;
add new cursor hooks so that mariadbconnector can specify
buffered or unbuffered cursors without too much difficulty.
This will also correctly default mariadbconnector to buffered
cursors which should repair the segfaults we've been getting.
Try to restore the assert_raises that was removed in
5b6dfc0c38bf1f01da4b8 to see if mariadbconnector segfaults
are resolved.
Change-Id: I77f1c972c742e40694972f578140bb0cac8c39eb
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Improved support for covering indexes (with INCLUDE columns). Added the
ability for postgresql to render CREATE INDEX statements with an INCLUDE
clause from Core. Index reflection also report INCLUDE columns separately
for both mssql and postgresql (11+).
Fixes: #4458
Change-Id: If0b82103fbc898cdaeaf6a6d2d421c732744acd6
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Make optional sequences render as identity in mssql
Remove unused dialect option sequence_default_column_type
Change-Id: I821eeffcb442f8d1b69186a9b798b15c3d8d6ff3
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Added support for inspection / reflection of partial indexes / filtered
indexes, i.e. those which use the ``mssql_where`` or ``postgresql_where``
parameters, with :class:`_schema.Index`. The entry is both part of the
dictionary returned by :meth:`.Inspector.get_indexes` as well as part of a
reflected :class:`_schema.Index` construct that was reflected. Pull
request courtesy Ramon Williams.
**Have a nice day!**
Fixes: #4966
Closes: #5504
Pull-request: https://github.com/sqlalchemy/sqlalchemy/pull/5504
Pull-request-sha: b3018bac987081193b2e65cfdb6aeb7d5d270fcd
Change-Id: Icbb2f93d1545700718ccb5222097185b815f5dbc
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This change includes mainly that the bracketed use within
select() is moved to positional, and keyword arguments are
removed from calls to the select() function. it does not
yet fully address other issues such as keyword arguments passed
to the table.select().
Additionally, allows False / None to both be considered
as "disable" for all of select.correlate(), select.correlate_except(),
query.correlate(), which establishes consistency with
passing of ``False`` for the legact select(correlate=False)
argument.
Change-Id: Ie6c6e6abfbd3d75d4c8de504c0cf0159e6999108
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Change-Id: I649662d440f83df379922e8c967d28f635f9c85b
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Added support for PostgreSQL "readonly" and "deferrable" flags for all of
psycopg2, asyncpg and pg8000 dialects. This takes advantage of a newly
generalized version of the "isolation level" API to support other kinds of
session attributes set via execution options that are reliably reset
when connections are returned to the connection pool.
Fixes: #5549
Change-Id: I0ad6d7a095e49d331618274c40ce75c76afdc7dd
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The isolation level section in the docs inadvertently
copied the PostgreSQL example using the PGDialect.isolation_level
parameter and not the execution_options. ensure only
the execution_options version is documented.
Change-Id: I94e02ede62d3dded40e3fcbce8d04608dc063108
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Two operations have been defined:
* :meth:`~.ColumnOperators.regexp_match` implementing a regular
expression match like function.
* :meth:`~.ColumnOperators.regexp_replace` implementing a regular
expression string replace function.
Fixes: #1390
Change-Id: I44556846e4668ccf329023613bd26861d5c674e6
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MariaDB should not run a Sequence if it has optional=True.
Additionally, rework the rules in crud.py to accommodate the
new combination MariaDB brings us, which is a dialect
that supports both cursor.lastrowid, explicit sequences,
*and* no support for returning.
Co-authored-by: Mike Bayer <mike_mp@zzzcomputing.com>
Fixes: #5528
Change-Id: I9a8ea69a34983affa95dfd22186e2908fdf0d58c
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Added the :class:`_schema.Identity` construct that can be used to
configure identity columns rendered with GENERATED { ALWAYS |
BY DEFAULT } AS IDENTITY. Currently the supported backends are
PostgreSQL >= 10, Oracle >= 12 and MSSQL (with different syntax
and a subset of functionalities).
Fixes: #5362
Fixes: #5324
Fixes: #5360
Change-Id: Iecea6f3ceb36821e8b96f0b61049b580507a1875
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The _execute_20 and exec_driver_sql methods should wrap
up the parameters so that they represent the single list / single
dictionary style of invocation into the legacy methods. then
the before_ after_ execute event handlers should be receiving
the parameter dictionary as a single dictionary. this requires
that we break out distill_params to work differently if event
handlers are present.
additionally, add deprecation warnings for old argument passing
styles.
Change-Id: I97cb4d06adfcc6b889f10d01cc7775925cffb116
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Fixed issue where the :class:`_postgresql.ENUM` type would not consult the
schema translate map when emitting a CREATE TYPE or DROP TYPE during the
test to see if the type exists or not. Additionally, repaired an issue
where if the same enum were encountered multiple times in a single DDL
sequence, the "check" query would run repeatedly rather than relying upon a
cached value.
Fixes: #5520
Change-Id: I79f46e29ac0168e873ff178c242f8d78f6679aeb
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Added support for the :class:`_types.JSON` datatype on the SQL Server
dialect using the :class:`_mssql.JSON` implementation, which implements SQL
Server's JSON functionality against the ``NVARCHAR(max)`` datatype as per
SQL Server documentation. Implementation courtesy Gord Thompson.
Fixes: #4384
Change-Id: I28af79a4d8fafaa68ea032228609bba727784f18
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Allow specifying the data type when creating a :class:`.Sequence` in
PostgreSQL by using the parameter :paramref:`.Sequence.data_type`.
Fixes: #5498
Change-Id: I2b4a80aa89b1503c56748dc3ecd2cf145faddd8b
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The pg8000 dialect has been revised and modernized for the most recent
version of the pg8000 driver for PostgreSQL. Changes to the dialect
include:
* All data types are now sent as text rather than binary.
* Using adapters, custom types can be plugged in to pg8000.
* Previously, named prepared statements were used for all statements.
Now unnamed prepared statements are used by default, and named
prepared statements can be used explicitly by calling the
Connection.prepare() method, which returns a PreparedStatement
object.
Pull request courtesy Tony Locke.
Notes by Mike: to get this all working it was needed to break
up JSONIndexType into "str" and "int" subtypes; this will be
needed for any dialect that is dependent on setinputsizes().
also includes @caselit's idea to include query params
in the dbdriver parameter.
Co-authored-by: Mike Bayer <mike_mp@zzzcomputing.com>
Closes: #5451
Pull-request: https://github.com/sqlalchemy/sqlalchemy/pull/5451
Pull-request-sha: 639751ca9c7544801b9ede02e6cbe15a16c59c82
Change-Id: I2869bc52c330916773a41d11d12c297aecc8fcd8
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Improved the :func:`_sql.tuple_` construct such that it behaves predictably
when used in a columns-clause context. The SQL tuple is not supported as a
"SELECT" columns clause element on most backends; on those that do
(PostgreSQL, not surprisingly), the Python DBAPI does not have a "nested
type" concept so there are still challenges in fetching rows for such an
object. Use of :func:`_sql.tuple_` in a :func:`_sql.select` or
:class:`_orm.Query` will now raise a :class:`_exc.CompileError` at the
point at which the :func:`_sql.tuple_` object is seen as presenting itself
for fetching rows (i.e., if the tuple is in the columns clause of a
subquery, no error is raised). For ORM use,the :class:`_orm.Bundle` object
is an explicit directive that a series of columns should be returned as a
sub-tuple per row and is suggested by the error message. Additionally ,the
tuple will now render with parenthesis in all contexts. Previously, the
parenthesization would not render in a columns context leading to
non-defined behavior.
As part of this change, Tuple receives a dedicated datatype
which appears to allow us the very desirable change of removing
the bindparam._expanding_in_types attribute as well as
ClauseList._tuple_values (which might already have not been
needed due to #4645).
Fixes: #5127
Change-Id: Iecafa0e0aac2f1f37ec8d0e1631d562611c90200
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We want TOX_POSTGRESQL and similar to be the fixed variable
that is configured from CI environment. These variables should refer
to database servers but individual drivers like asyncpg mysqlconnector
etc. should come from local tox.ini. add a new system to generate
per-driver URLs from a simple list of hostname-based URLs delivered
from CI environment.
Change-Id: I4267b4a70742765388c7e7c4432c1da9d9adece2
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Continuing on 788ba204a43b37d28cc690138b83e6782f8a46da
make sure asyncpg doesn't get imported if version < 3.6.
Change-Id: Ic070a0c9d3656f7da7ce2eb85033968fc88a64b9
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Using the approach introduced at
https://gist.github.com/zzzeek/6287e28054d3baddc07fa21a7227904e
We can now create asyncio endpoints that are then handled
in "implicit IO" form within the majority of the Core internals.
Then coroutines are re-exposed at the point at which we call
into asyncpg methods.
Patch includes:
* asyncpg dialect
* asyncio package
* engine, result, ORM session classes
* new test fixtures, tests
* some work with pep-484 and a short plugin for the
pyannotate package, which seems to have so-so results
Change-Id: Idbcc0eff72c4cad572914acdd6f40ddb1aef1a7d
Fixes: #3414
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Fixes: #5482
All supported python versions provide 'uuid' module.
Closes: #5483
Pull-request: https://github.com/sqlalchemy/sqlalchemy/pull/5483
Pull-request-sha: fc32498a8b639ff21d5898100592782826d2c6dd
Change-Id: I8b41b811da7576f724353425dad5d6f581641b4b
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Fixed issue where the return type for the various RANGE comparison
operators would itself be the same RANGE type rather than BOOLEAN, which
would cause an undesirable result in the case that a
:class:`.TypeDecorator` that defined result-processing behavior were in
use. Pull request courtesy Jim Bosch.
Fixes: #5476
Closes: #5477
Pull-request: https://github.com/sqlalchemy/sqlalchemy/pull/5477
Pull-request-sha: 925b117e0c91cdd67d9ddbd9d65f5ca3e88af91f
Change-Id: I52ab4d4362d379c8253990f9d328a40990a64520
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this concept is not clear that we offer real
DBAPI autocommit everywhere. backport 1.3 with edits
as well
Change-Id: I2e8328b7fb6e1cdc5453ab29c94276f60c7ca149
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Build on #5401 to allow the ORM to take advanage
of executemany INSERT + RETURNING.
Implemented the feature
updated tests
to support INSERT DEFAULT VALUES, needed to come up with
a new syntax for compiler INSERT INTO table (anycol) VALUES (DEFAULT)
which can then be iterated out for executemany.
Added graceful degrade to plain executemany for PostgreSQL <= 8.2
Renamed EXECUTEMANY_DEFAULT to EXECUTEMANY_PLAIN
Fix issue where unicode identifiers or parameter names wouldn't
work with execute_values() under Py2K, because we have to
encode the statement and therefore have to encode the
insert_single_values_expr too.
Correct issue from #5401 to support executemany + return_defaults
for a PK that is explicitly pre-generated, meaning we aren't actually
getting RETURNING but need to return it from compiled_parameters.
Fixes: #5263
Change-Id: Id68e5c158c4f9ebc33b61c06a448907921c2a657
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Note the PR has a few remaining doc linking issues
listed in the comment that must be addressed separately.
Signed-off-by: aplatkouski <5857672+aplatkouski@users.noreply.github.com>
Closes: #5371
Pull-request: https://github.com/sqlalchemy/sqlalchemy/pull/5371
Pull-request-sha: 7e7d233cf3a0c66980c27db0fcdb3c7d93bc2510
Change-Id: I9c36e8d8804483950db4b42c38ee456e384c59e3
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The psycopg2 dialect now defaults to using the very performant
``execute_values()`` psycopg2 extension for compiled INSERT statements,
and also impements RETURNING support when this extension is used. This
allows INSERT statements that even include an autoincremented SERIAL
or IDENTITY value to run very fast while still being able to return the
newly generated primary key values. The ORM will then integrate this
new feature in a separate change.
Implements RETURNING for insert with executemany
Adds support to return_defaults() mode and inserted_primary_key
to support mutiple INSERTed rows, via return_defauls_rows
and inserted_primary_key_rows accessors.
within default execution context, new cached compiler
getters are used to fetch primary keys from rows
inserted_primary_key now returns a plain tuple. this
is not yet a row-like object however this can be
added.
Adds distinct "values_only" and "batch" modes, as
"values" has a lot of benefits but "batch" breaks
cursor.rowcount
psycopg2 minimum version 2.7 so we can remove the
large number of checks for very old versions of
psycopg2
simplify tests to no longer distinguish between
native and non-native json
Fixes: #5401
Change-Id: Ic08fd3423d4c5d16ca50994460c0c234868bd61c
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This patch makes several improvements in the area of
bulk updates and deletes as well as the new session mechanics.
RETURNING is now used for an UPDATE or DELETE statement
emitted for a diaelct that supports "full returning"
in order to satisfy the "fetch" strategy; this currently
includes PostgreSQL and SQL Server. The Oracle dialect
does not support RETURNING for more than one row,
so a new dialect capability "full_returning" is added
in addition to the existing "implicit_returning", indicating
this dialect supports RETURNING for zero or more rows,
not just a single identity row.
The "fetch" strategy will gracefully degrade to
the previous SELECT mechanics for dialects that do not
support RETURNING.
Additionally, the "fetch" strategy will attempt to use
evaluation for the VALUES that were UPDATEd, rather
than just expiring the updated attributes. Values should
be evalutable in all cases where the value is not
a SQL expression.
The new approach also incurs some changes in the
session.execute mechanics, where do_orm_execute() event
handlers can now be chained to each return results;
this is in turn used by the handler to detect on a
per-bind basis if the fetch strategy needs to
do a SELECT or if it can do RETURNING. A test suite is
added to test_horizontal_shard that breaks up a single
UPDATE or DELETE operation among multiple backends
where some are SQLite and don't support RETURNING and
others are PostgreSQL and do.
The session event mechanics are corrected
in terms of the "orm pre execute" hook, which now
receives a flag "is_reentrant" so that the two
ORM implementations for this can skip on their work
if they are being called inside of ORMExecuteState.invoke(),
where previously bulk update/delete were calling its
SELECT a second time.
In order for "fetch" to get the correct identity when
called as pre-execute, it also requests the identity_token
for each mapped instance which is now added as an optional
capability of a SELECT for ORM columns. the identity_token
that's placed by horizontal_sharding is now made available
within each result row, so that even when fetching a
merged result of plain rows we can tell which row belongs
to which identity token.
The evaluator that takes place within the ORM bulk update and delete for
synchronize_session="evaluate" now supports the IN and NOT IN operators.
Tuple IN is also supported.
Fixes: #1653
Change-Id: I2292b56ae004b997cef0ba4d3fc350ae1dd5efc1
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Added new reflection method :meth:`.Inspector.get_sequence_names` which
returns all the sequences defined. Support for this method has been added
to the backend that support :class:`.Sequence`: PostgreSql, Oracle,
MSSQL and MariaDB >= 10.3.
Fixes: #2056
Change-Id: I0949696a39aa28c849edf2504779241f7443778a
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Fixes: #5331
Change-Id: Ia795a4d4d8ae4944d8a160d18f8b917177acf0de
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