sqlalchemy-declarative-extensions


Namesqlalchemy-declarative-extensions JSON
Version 0.15.7 PyPI version JSON
download
home_pageNone
SummaryLibrary to declare additional kinds of objects not natively supported by SQLAlchemy/Alembic.
upload_time2024-11-12 14:41:31
maintainerNone
docs_urlNone
authorNone
requires_python<4,>=3.8
licenseApache License Version 2.0, January 2004 http://www.apache.org/licenses/ TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 1. Definitions. "License" shall mean the terms and conditions for use, reproduction, and distribution as defined by Sections 1 through 9 of this document. "Licensor" shall mean the copyright owner or entity authorized by the copyright owner that is granting the License. "Legal Entity" shall mean the union of the acting entity and all other entities that control, are controlled by, or are under common control with that entity. For the purposes of this definition, "control" means (i) the power, direct or indirect, to cause the direction or management of such entity, whether by contract or otherwise, or (ii) ownership of fifty percent (50%) or more of the outstanding shares, or (iii) beneficial ownership of such entity. "You" (or "Your") shall mean an individual or Legal Entity exercising permissions granted by this License. "Source" form shall mean the preferred form for making modifications, including but not limited to software source code, documentation source, and configuration files. "Object" form shall mean any form resulting from mechanical transformation or translation of a Source form, including but not limited to compiled object code, generated documentation, and conversions to other media types. "Work" shall mean the work of authorship, whether in Source or Object form, made available under the License, as indicated by a copyright notice that is included in or attached to the work (an example is provided in the Appendix below). "Derivative Works" shall mean any work, whether in Source or Object form, that is based on (or derived from) the Work and for which the editorial revisions, annotations, elaborations, or other modifications represent, as a whole, an original work of authorship. For the purposes of this License, Derivative Works shall not include works that remain separable from, or merely link (or bind by name) to the interfaces of, the Work and Derivative Works thereof. "Contribution" shall mean any work of authorship, including the original version of the Work and any modifications or additions to that Work or Derivative Works thereof, that is intentionally submitted to Licensor for inclusion in the Work by the copyright owner or by an individual or Legal Entity authorized to submit on behalf of the copyright owner. For the purposes of this definition, "submitted" means any form of electronic, verbal, or written communication sent to the Licensor or its representatives, including but not limited to communication on electronic mailing lists, source code control systems, and issue tracking systems that are managed by, or on behalf of, the Licensor for the purpose of discussing and improving the Work, but excluding communication that is conspicuously marked or otherwise designated in writing by the copyright owner as "Not a Contribution." "Contributor" shall mean Licensor and any individual or Legal Entity on behalf of whom a Contribution has been received by Licensor and subsequently incorporated within the Work. 2. Grant of Copyright License. Subject to the terms and conditions of this License, each Contributor hereby grants to You a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare Derivative Works of, publicly display, publicly perform, sublicense, and distribute the Work and such Derivative Works in Source or Object form. 3. Grant of Patent License. Subject to the terms and conditions of this License, each Contributor hereby grants to You a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable (except as stated in this section) patent license to make, have made, use, offer to sell, sell, import, and otherwise transfer the Work, where such license applies only to those patent claims licensable by such Contributor that are necessarily infringed by their Contribution(s) alone or by combination of their Contribution(s) with the Work to which such Contribution(s) was submitted. If You institute patent litigation against any entity (including a cross-claim or counterclaim in a lawsuit) alleging that the Work or a Contribution incorporated within the Work constitutes direct or contributory patent infringement, then any patent licenses granted to You under this License for that Work shall terminate as of the date such litigation is filed. 4. Redistribution. You may reproduce and distribute copies of the Work or Derivative Works thereof in any medium, with or without modifications, and in Source or Object form, provided that You meet the following conditions: (a) You must give any other recipients of the Work or Derivative Works a copy of this License; and (b) You must cause any modified files to carry prominent notices stating that You changed the files; and (c) You must retain, in the Source form of any Derivative Works that You distribute, all copyright, patent, trademark, and attribution notices from the Source form of the Work, excluding those notices that do not pertain to any part of the Derivative Works; and (d) If the Work includes a "NOTICE" text file as part of its distribution, then any Derivative Works that You distribute must include a readable copy of the attribution notices contained within such NOTICE file, excluding those notices that do not pertain to any part of the Derivative Works, in at least one of the following places: within a NOTICE text file distributed as part of the Derivative Works; within the Source form or documentation, if provided along with the Derivative Works; or, within a display generated by the Derivative Works, if and wherever such third-party notices normally appear. The contents of the NOTICE file are for informational purposes only and do not modify the License. You may add Your own attribution notices within Derivative Works that You distribute, alongside or as an addendum to the NOTICE text from the Work, provided that such additional attribution notices cannot be construed as modifying the License. You may add Your own copyright statement to Your modifications and may provide additional or different license terms and conditions for use, reproduction, or distribution of Your modifications, or for any such Derivative Works as a whole, provided Your use, reproduction, and distribution of the Work otherwise complies with the conditions stated in this License. 5. Submission of Contributions. Unless You explicitly state otherwise, any Contribution intentionally submitted for inclusion in the Work by You to the Licensor shall be under the terms and conditions of this License, without any additional terms or conditions. Notwithstanding the above, nothing herein shall supersede or modify the terms of any separate license agreement you may have executed with Licensor regarding such Contributions. 6. Trademarks. This License does not grant permission to use the trade names, trademarks, service marks, or product names of the Licensor, except as required for reasonable and customary use in describing the origin of the Work and reproducing the content of the NOTICE file. 7. Disclaimer of Warranty. Unless required by applicable law or agreed to in writing, Licensor provides the Work (and each Contributor provides its Contributions) on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied, including, without limitation, any warranties or conditions of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A PARTICULAR PURPOSE. You are solely responsible for determining the appropriateness of using or redistributing the Work and assume any risks associated with Your exercise of permissions under this License. 8. Limitation of Liability. In no event and under no legal theory, whether in tort (including negligence), contract, or otherwise, unless required by applicable law (such as deliberate and grossly negligent acts) or agreed to in writing, shall any Contributor be liable to You for damages, including any direct, indirect, special, incidental, or consequential damages of any character arising as a result of this License or out of the use or inability to use the Work (including but not limited to damages for loss of goodwill, work stoppage, computer failure or malfunction, or any and all other commercial damages or losses), even if such Contributor has been advised of the possibility of such damages. 9. Accepting Warranty or Additional Liability. While redistributing the Work or Derivative Works thereof, You may choose to offer, and charge a fee for, acceptance of support, warranty, indemnity, or other liability obligations and/or rights consistent with this License. However, in accepting such obligations, You may act only on Your own behalf and on Your sole responsibility, not on behalf of any other Contributor, and only if You agree to indemnify, defend, and hold each Contributor harmless for any liability incurred by, or claims asserted against, such Contributor by reason of your accepting any such warranty or additional liability. END OF TERMS AND CONDITIONS APPENDIX: How to apply the Apache License to your work. To apply the Apache License to your work, attach the following boilerplate notice, with the fields enclosed by brackets "[]" replaced with your own identifying information. (Don't include the brackets!) The text should be enclosed in the appropriate comment syntax for the file format. We also recommend that a file or class name and description of purpose be included on the same "printed page" as the copyright notice for easier identification within third-party archives. Copyright [yyyy] [name of copyright owner] Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
keywords alembic declarative function grant mysql postgresql role schema snowflake sqlalchemy sqlite trigger view
VCS
bugtrack_url
requirements No requirements were recorded.
Travis-CI No Travis.
coveralls test coverage No coveralls.
            # SQLAlchemy Declarative Extensions

[![Actions Status](https://github.com/dancardin/sqlalchemy-declarative-extensions/workflows/test/badge.svg)](https://github.com/dancardin/sqlalchemy-declarative-extensions/actions)
[![Coverage Status](https://coveralls.io/repos/github/DanCardin/sqlalchemy-declarative-extensions/badge.svg?branch=main)](https://coveralls.io/github/DanCardin/sqlalchemy-declarative-extensions?branch=main)
[![Documentation Status](https://readthedocs.org/projects/sqlalchemy-declarative-extensions/badge/?version=latest)](https://sqlalchemy-declarative-extensions.readthedocs.io/en/latest/?badge=latest)

See the full documentation
[here](https://sqlalchemy-declarative-extensions.readthedocs.io/en/latest/).

Adds extensions to SQLAlchemy (and/or Alembic) which allows declaratively
stating the existence of additional kinds of objects about your database not
natively supported by SQLAlchemy/Alembic.

The primary function(s) of this library include:

- Registering onto the SQLAlchemy event system such that `metadata.create_all`
  creates these objects.
- (Optionally) Registers into Alembic such that
  `alembic revision --autogenerate` automatically creates/updates/deletes
  declared objects.

Object support includes:

|                | Postgres | MySQL | SQLite | Snowflake |
| -------------- | -------- | ----- | ------ | --------- |
| Schemas        | ✓        | N/A   | ✓      | ✓         |
| Views          | ✓        | ✓     | ✓      | ✓         |
| Roles          | ✓        |       | N/A    | ✓         |
| Grants         | ✓        |       | N/A    |           |
| Default Grants | ✓        |       | N/A    |           |
| Functions      | ✓        | ✓     |        |           |
| Procedures     | ✓        | ✓     |        |           |
| Triggers       | ✓        | ✓     |        |           |
| Databases      | ✓        |       | N/A    | ✓         |
| Rows (data)    | ✓        | ✓     | ✓      | ✓         |
| "Audit Tables" | ✓        |       |        |           |

Notes:

- "Row" is implemented with pure SQLAlchemy concepts, so should work for any
  dialect that you can use SQLAlchemy to connect to.
- "Audit Tables" are a higher-level set of functions/triggers which record data
  changes against some source table.

In principle, this library **can** absolutely support any database supported by
SQLAlchemy, and capable of being introspected enough to support detection of
different kinds of objects. In reality, the existence of implementations are going to
be purely driven by actual usage/contributions/requests.

See [docs on dialect support](https://sqlalchemy-declarative-extensions.readthedocs.io/en/latest/contributing/dialect-support.html)
for information on how to improve support for a given dialect. Also feel free to submit an issue!

## Kitchen Sink Example (using all available features)

```python
from sqlalchemy import Column, types, select
from sqlalchemy.orm import as_declarative
from sqlalchemy_declarative_extensions import (
    declarative_database, Schemas, Roles, Row, View, view,
)
from sqlalchemy_declarative_extensions.dialects.postgresql import (
    DefaultGrant, Function, Trigger, Role
)
from sqlalchemy_declarative_extensions.audit import audit


@declarative_database
@as_declarative
class Base:
    # Note: each object type also has a plural version (i.e. Schemas/Roles/etc) where you can specify
    # collection-level options like `ignore_unspecified`).
    #
    # If you dont set any collection-level options, you can instead use raw list/iterable as the collection.
    schemas = Schemas().are("example")
    roles = Roles(ignore_unspecified=True).are(
        Role("read", login=False),
        Role(
            "app",
            in_roles=['read']
        ),
    )
    grants = [
        DefaultGrant.on_tables_in_schema("public", 'example').grant("select", to="read"),
        DefaultGrant.on_sequences_in_schema("public").grant("usage", to="read"),
        Grant.new("usage", to="read").on_schemas("example")
    ]
    rows = [
        Row('foo', id=1),
    ]
    views = [
        View("low_foo", "select * from foo where i < 10"),
    ]
    functions = [
        Function(
            "fancy_function",
            """
            BEGIN
            INSERT INTO foo (id) select NEW.id + 1;
            RETURN NULL;
            END
            """,
            language="plpgsql",
            returns="trigger",
        ),
    ]
    triggers = [
        Trigger.after("insert", on="foo", execute="fancy_function")
        .named("on_insert_foo")
        .when("pg_trigger_depth() < 1")
        .for_each_row(),
    ]


@audit()
class Foo(Base):
    __tablename__ = 'foo'

    id = Column(types.Integer(), primary_key=True)


audit_table = Foo.__audit_table__


@view(Base)
class HighFoo:
    __tablename__ = "high_foo"
    __view__ = select(Foo.__table__).where(Foo.__table__.c.id >= 10)
```

Note, there is also support for declaring objects directly through the
`MetaData` for users not using sqlalchemy's declarative API.

## Event Registration

By default, the above example does not automatically do anything. Depending on
the context, you can use one of two registration hooks:
`register_sqlalchemy_events` or `register_alembic_events`.

### `register_sqlalchemy_events`

This registers events in SQLAlchemy's event system such that a
`metadata.create_all(...)` call will create the declared database objects.

```python
from sqlalchemy_declarative_extensions import register_sqlalchemy_events

metadata = Base.metadata  # Given the example above.
register_sqlalchemy_events(metadata)
# Which is equivalent to...
register_sqlalchemy_events(metadata, schemas=False, roles=False, grants=False, rows=False)
```

All object types are opt in, and should be explicitly included in order to get
registered.

Practically, this is to avoid issues with testing. In **most** cases the
`metadata.create_all` call will be run in tests, a context where it's more
likely that you dont **need** grants or grants, and where parallel test
execution could lead to issues with role or schema creation, depending on your
setup.

### `register_alembic_events`

This registers comparators in Alembic's registration system such that an
`alembic revision --autogenerate` command will diff the existing database state
against the declared database objects, and issue statements to
create/update/delete objects in order to match the declared state.

```python
# alembic's `env.py`
from sqlalchemy_declarative_extensions import register_alembic_events

register_alembic_events()
# Which is equivalent to...
register_sqlalchemy_events(schemas=True, roles=True, grants=True, rows=True)
```

All object types are opt out but can be excluded.

In contrast to `register_sqlalchemy_events`, it's much more likely that you're
declaring most of these object types in order to have alembic track them

## Alembic-utils

[Alembic Utils](https://github.com/olirice/alembic_utils) is the primary library
against which this library can be compared. At time of writing, **most** (but
not all) object types supported by alembic-utils are supported by this library.
One might begin to question when to use which library.

Below is a list of points on which the two libraries diverge. But note that you
**can** certainly use both in tandem! It doesn't need to be one or the other,
and certainly for any object types which do not overlap, you might **need** to
use both.

- Database Support

  - Alembic Utils seems to explicitly only support PostgreSQL.

  - This library is designed to support any dialect (in theory). Certainly
    PostgreSQL is **best** supported, but there does exist support for specific
    kinds of objects to varying levels of support for Snowflake, SQLite, and MySQL,
    so far.

- Architecture

  - Alembic Utils is directly tied to Alembic and does not support SQLAlchemy's
    `MetaData.create_all`. It's also the responsibility of the user to
    discover/register objects in alembic.

  - This library **depends** only on SQLAlchemy, although it also supports
    alembic. Support for `MetaData.create_all` can be important for creating all
    object types in tests. It also is designed such that objects are registered
    on the `MetaData` itself, so there is no need for any specific discovery
    phase.

- Scope

  - Alembic Utils declares specific, individual objects. I.e. you instantiate
    one specific `PGGrantTable` or `PGView` instance and Alembic know knows you
    want that object to be created. It cannot drop objects it is not already
    aware of.

  - This library declares the objects the system as a whole expects to exist.
    Similar to Alembic's behavior on tables, it will (by default) detect any
    **undeclared** objects that should not exist and drop them. That means, you
    can rely on this object to ensure the state of your migrations matches the
    state of your database exactly.

- Migration history

  - Alembic Utils imports and references its own objects in your migrations
    history. This can be unfortunate, in that it deeply ties your migrations
    history to alembic-utils.

    (In fact, this can be a sticking point, trying to convert **away** from
    `alembic_utils`, because it will attempt to drop all the (e.g `PGView`)
    instances previously created when we replaced it with this library.)

  - This library, by contrast, prefers to emit the raw SQL of the operation into
    your migration. That means you know the exact commands that will execute in
    your migration, which can be helpful in debugging failure. It also means, if
    at any point you decide to stop use of the library (or pause a given type of
    object, due to a bug), you can! This library's behaviors are primarily very
    much `--autogenerate`-time only.

- Abstraction Level

  - Alembic Utils appears to define a very "literal" interface (for example,
    `PGView` accepts the whole view definition as a raw literal string).

  - This library tries to, as much as possible, provide a more abstracted
    interface that enables more compatibility with SQLAlchemy (For example
    `View` accepts SQLAlchemy objects which can be coerced into a `SELECT`). It
    also tends towards "builder" interfaces which progressively produce a object
    (Take a look at the `DefaultGrant` above, for an example of where that's
    helpful).

A separate note on conversion/compatibility. Where possible, this library tries
to support alembic-utils native objects as stand-ins for the objects defined in
this library. For example, `alembic_utils.pg_view.PGView` can be declared
instead of a `sqlalchemy_declarative_extensions.View`, and we will internally
coerce it into the appropriate type. Hopefully this eases any transitional
costs, or issues using one or the other library.

            

Raw data

            {
    "_id": null,
    "home_page": null,
    "name": "sqlalchemy-declarative-extensions",
    "maintainer": null,
    "docs_url": null,
    "requires_python": "<4,>=3.8",
    "maintainer_email": null,
    "keywords": "alembic, declarative, function, grant, mysql, postgresql, role, schema, snowflake, sqlalchemy, sqlite, trigger, view",
    "author": null,
    "author_email": "Dan Cardin <ddcardin@gmail.com>",
    "download_url": "https://files.pythonhosted.org/packages/69/05/72144f9c2a2d1525af052e2aa580a7c3c83d02060d7df455d1d967a875d8/sqlalchemy_declarative_extensions-0.15.7.tar.gz",
    "platform": null,
    "description": "# SQLAlchemy Declarative Extensions\n\n[![Actions Status](https://github.com/dancardin/sqlalchemy-declarative-extensions/workflows/test/badge.svg)](https://github.com/dancardin/sqlalchemy-declarative-extensions/actions)\n[![Coverage Status](https://coveralls.io/repos/github/DanCardin/sqlalchemy-declarative-extensions/badge.svg?branch=main)](https://coveralls.io/github/DanCardin/sqlalchemy-declarative-extensions?branch=main)\n[![Documentation Status](https://readthedocs.org/projects/sqlalchemy-declarative-extensions/badge/?version=latest)](https://sqlalchemy-declarative-extensions.readthedocs.io/en/latest/?badge=latest)\n\nSee the full documentation\n[here](https://sqlalchemy-declarative-extensions.readthedocs.io/en/latest/).\n\nAdds extensions to SQLAlchemy (and/or Alembic) which allows declaratively\nstating the existence of additional kinds of objects about your database not\nnatively supported by SQLAlchemy/Alembic.\n\nThe primary function(s) of this library include:\n\n- Registering onto the SQLAlchemy event system such that `metadata.create_all`\n  creates these objects.\n- (Optionally) Registers into Alembic such that\n  `alembic revision --autogenerate` automatically creates/updates/deletes\n  declared objects.\n\nObject support includes:\n\n|                | Postgres | MySQL | SQLite | Snowflake |\n| -------------- | -------- | ----- | ------ | --------- |\n| Schemas        | \u2713        | N/A   | \u2713      | \u2713         |\n| Views          | \u2713        | \u2713     | \u2713      | \u2713         |\n| Roles          | \u2713        |       | N/A    | \u2713         |\n| Grants         | \u2713        |       | N/A    |           |\n| Default Grants | \u2713        |       | N/A    |           |\n| Functions      | \u2713        | \u2713     |        |           |\n| Procedures     | \u2713        | \u2713     |        |           |\n| Triggers       | \u2713        | \u2713     |        |           |\n| Databases      | \u2713        |       | N/A    | \u2713         |\n| Rows (data)    | \u2713        | \u2713     | \u2713      | \u2713         |\n| \"Audit Tables\" | \u2713        |       |        |           |\n\nNotes:\n\n- \"Row\" is implemented with pure SQLAlchemy concepts, so should work for any\n  dialect that you can use SQLAlchemy to connect to.\n- \"Audit Tables\" are a higher-level set of functions/triggers which record data\n  changes against some source table.\n\nIn principle, this library **can** absolutely support any database supported by\nSQLAlchemy, and capable of being introspected enough to support detection of\ndifferent kinds of objects. In reality, the existence of implementations are going to\nbe purely driven by actual usage/contributions/requests.\n\nSee [docs on dialect support](https://sqlalchemy-declarative-extensions.readthedocs.io/en/latest/contributing/dialect-support.html)\nfor information on how to improve support for a given dialect. Also feel free to submit an issue!\n\n## Kitchen Sink Example (using all available features)\n\n```python\nfrom sqlalchemy import Column, types, select\nfrom sqlalchemy.orm import as_declarative\nfrom sqlalchemy_declarative_extensions import (\n    declarative_database, Schemas, Roles, Row, View, view,\n)\nfrom sqlalchemy_declarative_extensions.dialects.postgresql import (\n    DefaultGrant, Function, Trigger, Role\n)\nfrom sqlalchemy_declarative_extensions.audit import audit\n\n\n@declarative_database\n@as_declarative\nclass Base:\n    # Note: each object type also has a plural version (i.e. Schemas/Roles/etc) where you can specify\n    # collection-level options like `ignore_unspecified`).\n    #\n    # If you dont set any collection-level options, you can instead use raw list/iterable as the collection.\n    schemas = Schemas().are(\"example\")\n    roles = Roles(ignore_unspecified=True).are(\n        Role(\"read\", login=False),\n        Role(\n            \"app\",\n            in_roles=['read']\n        ),\n    )\n    grants = [\n        DefaultGrant.on_tables_in_schema(\"public\", 'example').grant(\"select\", to=\"read\"),\n        DefaultGrant.on_sequences_in_schema(\"public\").grant(\"usage\", to=\"read\"),\n        Grant.new(\"usage\", to=\"read\").on_schemas(\"example\")\n    ]\n    rows = [\n        Row('foo', id=1),\n    ]\n    views = [\n        View(\"low_foo\", \"select * from foo where i < 10\"),\n    ]\n    functions = [\n        Function(\n            \"fancy_function\",\n            \"\"\"\n            BEGIN\n            INSERT INTO foo (id) select NEW.id + 1;\n            RETURN NULL;\n            END\n            \"\"\",\n            language=\"plpgsql\",\n            returns=\"trigger\",\n        ),\n    ]\n    triggers = [\n        Trigger.after(\"insert\", on=\"foo\", execute=\"fancy_function\")\n        .named(\"on_insert_foo\")\n        .when(\"pg_trigger_depth() < 1\")\n        .for_each_row(),\n    ]\n\n\n@audit()\nclass Foo(Base):\n    __tablename__ = 'foo'\n\n    id = Column(types.Integer(), primary_key=True)\n\n\naudit_table = Foo.__audit_table__\n\n\n@view(Base)\nclass HighFoo:\n    __tablename__ = \"high_foo\"\n    __view__ = select(Foo.__table__).where(Foo.__table__.c.id >= 10)\n```\n\nNote, there is also support for declaring objects directly through the\n`MetaData` for users not using sqlalchemy's declarative API.\n\n## Event Registration\n\nBy default, the above example does not automatically do anything. Depending on\nthe context, you can use one of two registration hooks:\n`register_sqlalchemy_events` or `register_alembic_events`.\n\n### `register_sqlalchemy_events`\n\nThis registers events in SQLAlchemy's event system such that a\n`metadata.create_all(...)` call will create the declared database objects.\n\n```python\nfrom sqlalchemy_declarative_extensions import register_sqlalchemy_events\n\nmetadata = Base.metadata  # Given the example above.\nregister_sqlalchemy_events(metadata)\n# Which is equivalent to...\nregister_sqlalchemy_events(metadata, schemas=False, roles=False, grants=False, rows=False)\n```\n\nAll object types are opt in, and should be explicitly included in order to get\nregistered.\n\nPractically, this is to avoid issues with testing. In **most** cases the\n`metadata.create_all` call will be run in tests, a context where it's more\nlikely that you dont **need** grants or grants, and where parallel test\nexecution could lead to issues with role or schema creation, depending on your\nsetup.\n\n### `register_alembic_events`\n\nThis registers comparators in Alembic's registration system such that an\n`alembic revision --autogenerate` command will diff the existing database state\nagainst the declared database objects, and issue statements to\ncreate/update/delete objects in order to match the declared state.\n\n```python\n# alembic's `env.py`\nfrom sqlalchemy_declarative_extensions import register_alembic_events\n\nregister_alembic_events()\n# Which is equivalent to...\nregister_sqlalchemy_events(schemas=True, roles=True, grants=True, rows=True)\n```\n\nAll object types are opt out but can be excluded.\n\nIn contrast to `register_sqlalchemy_events`, it's much more likely that you're\ndeclaring most of these object types in order to have alembic track them\n\n## Alembic-utils\n\n[Alembic Utils](https://github.com/olirice/alembic_utils) is the primary library\nagainst which this library can be compared. At time of writing, **most** (but\nnot all) object types supported by alembic-utils are supported by this library.\nOne might begin to question when to use which library.\n\nBelow is a list of points on which the two libraries diverge. But note that you\n**can** certainly use both in tandem! It doesn't need to be one or the other,\nand certainly for any object types which do not overlap, you might **need** to\nuse both.\n\n- Database Support\n\n  - Alembic Utils seems to explicitly only support PostgreSQL.\n\n  - This library is designed to support any dialect (in theory). Certainly\n    PostgreSQL is **best** supported, but there does exist support for specific\n    kinds of objects to varying levels of support for Snowflake, SQLite, and MySQL,\n    so far.\n\n- Architecture\n\n  - Alembic Utils is directly tied to Alembic and does not support SQLAlchemy's\n    `MetaData.create_all`. It's also the responsibility of the user to\n    discover/register objects in alembic.\n\n  - This library **depends** only on SQLAlchemy, although it also supports\n    alembic. Support for `MetaData.create_all` can be important for creating all\n    object types in tests. It also is designed such that objects are registered\n    on the `MetaData` itself, so there is no need for any specific discovery\n    phase.\n\n- Scope\n\n  - Alembic Utils declares specific, individual objects. I.e. you instantiate\n    one specific `PGGrantTable` or `PGView` instance and Alembic know knows you\n    want that object to be created. It cannot drop objects it is not already\n    aware of.\n\n  - This library declares the objects the system as a whole expects to exist.\n    Similar to Alembic's behavior on tables, it will (by default) detect any\n    **undeclared** objects that should not exist and drop them. That means, you\n    can rely on this object to ensure the state of your migrations matches the\n    state of your database exactly.\n\n- Migration history\n\n  - Alembic Utils imports and references its own objects in your migrations\n    history. This can be unfortunate, in that it deeply ties your migrations\n    history to alembic-utils.\n\n    (In fact, this can be a sticking point, trying to convert **away** from\n    `alembic_utils`, because it will attempt to drop all the (e.g `PGView`)\n    instances previously created when we replaced it with this library.)\n\n  - This library, by contrast, prefers to emit the raw SQL of the operation into\n    your migration. That means you know the exact commands that will execute in\n    your migration, which can be helpful in debugging failure. It also means, if\n    at any point you decide to stop use of the library (or pause a given type of\n    object, due to a bug), you can! This library's behaviors are primarily very\n    much `--autogenerate`-time only.\n\n- Abstraction Level\n\n  - Alembic Utils appears to define a very \"literal\" interface (for example,\n    `PGView` accepts the whole view definition as a raw literal string).\n\n  - This library tries to, as much as possible, provide a more abstracted\n    interface that enables more compatibility with SQLAlchemy (For example\n    `View` accepts SQLAlchemy objects which can be coerced into a `SELECT`). It\n    also tends towards \"builder\" interfaces which progressively produce a object\n    (Take a look at the `DefaultGrant` above, for an example of where that's\n    helpful).\n\nA separate note on conversion/compatibility. Where possible, this library tries\nto support alembic-utils native objects as stand-ins for the objects defined in\nthis library. For example, `alembic_utils.pg_view.PGView` can be declared\ninstead of a `sqlalchemy_declarative_extensions.View`, and we will internally\ncoerce it into the appropriate type. Hopefully this eases any transitional\ncosts, or issues using one or the other library.\n",
    "bugtrack_url": null,
    "license": "Apache License Version 2.0, January 2004 http://www.apache.org/licenses/  TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION  1. Definitions.  \"License\" shall mean the terms and conditions for use, reproduction, and distribution as defined by Sections 1 through 9 of this document.  \"Licensor\" shall mean the copyright owner or entity authorized by the copyright owner that is granting the License.  \"Legal Entity\" shall mean the union of the acting entity and all other entities that control, are controlled by, or are under common control with that entity. For the purposes of this definition, \"control\" means (i) the power, direct or indirect, to cause the direction or management of such entity, whether by contract or otherwise, or (ii) ownership of fifty percent (50%) or more of the outstanding shares, or (iii) beneficial ownership of such entity.  \"You\" (or \"Your\") shall mean an individual or Legal Entity exercising permissions granted by this License.  \"Source\" form shall mean the preferred form for making modifications, including but not limited to software source code, documentation source, and configuration files.  \"Object\" form shall mean any form resulting from mechanical transformation or translation of a Source form, including but not limited to compiled object code, generated documentation, and conversions to other media types.  \"Work\" shall mean the work of authorship, whether in Source or Object form, made available under the License, as indicated by a copyright notice that is included in or attached to the work (an example is provided in the Appendix below).  \"Derivative Works\" shall mean any work, whether in Source or Object form, that is based on (or derived from) the Work and for which the editorial revisions, annotations, elaborations, or other modifications represent, as a whole, an original work of authorship. For the purposes of this License, Derivative Works shall not include works that remain separable from, or merely link (or bind by name) to the interfaces of, the Work and Derivative Works thereof.  \"Contribution\" shall mean any work of authorship, including the original version of the Work and any modifications or additions to that Work or Derivative Works thereof, that is intentionally submitted to Licensor for inclusion in the Work by the copyright owner or by an individual or Legal Entity authorized to submit on behalf of the copyright owner. For the purposes of this definition, \"submitted\" means any form of electronic, verbal, or written communication sent to the Licensor or its representatives, including but not limited to communication on electronic mailing lists, source code control systems, and issue tracking systems that are managed by, or on behalf of, the Licensor for the purpose of discussing and improving the Work, but excluding communication that is conspicuously marked or otherwise designated in writing by the copyright owner as \"Not a Contribution.\"  \"Contributor\" shall mean Licensor and any individual or Legal Entity on behalf of whom a Contribution has been received by Licensor and subsequently incorporated within the Work.  2. Grant of Copyright License. Subject to the terms and conditions of this License, each Contributor hereby grants to You a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare Derivative Works of, publicly display, publicly perform, sublicense, and distribute the Work and such Derivative Works in Source or Object form.  3. Grant of Patent License. Subject to the terms and conditions of this License, each Contributor hereby grants to You a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable (except as stated in this section) patent license to make, have made, use, offer to sell, sell, import, and otherwise transfer the Work, where such license applies only to those patent claims licensable by such Contributor that are necessarily infringed by their Contribution(s) alone or by combination of their Contribution(s) with the Work to which such Contribution(s) was submitted. If You institute patent litigation against any entity (including a cross-claim or counterclaim in a lawsuit) alleging that the Work or a Contribution incorporated within the Work constitutes direct or contributory patent infringement, then any patent licenses granted to You under this License for that Work shall terminate as of the date such litigation is filed.  4. Redistribution. You may reproduce and distribute copies of the Work or Derivative Works thereof in any medium, with or without modifications, and in Source or Object form, provided that You meet the following conditions:  (a) You must give any other recipients of the Work or Derivative Works a copy of this License; and  (b) You must cause any modified files to carry prominent notices stating that You changed the files; and  (c) You must retain, in the Source form of any Derivative Works that You distribute, all copyright, patent, trademark, and attribution notices from the Source form of the Work, excluding those notices that do not pertain to any part of the Derivative Works; and  (d) If the Work includes a \"NOTICE\" text file as part of its distribution, then any Derivative Works that You distribute must include a readable copy of the attribution notices contained within such NOTICE file, excluding those notices that do not pertain to any part of the Derivative Works, in at least one of the following places: within a NOTICE text file distributed as part of the Derivative Works; within the Source form or documentation, if provided along with the Derivative Works; or, within a display generated by the Derivative Works, if and wherever such third-party notices normally appear. The contents of the NOTICE file are for informational purposes only and do not modify the License. You may add Your own attribution notices within Derivative Works that You distribute, alongside or as an addendum to the NOTICE text from the Work, provided that such additional attribution notices cannot be construed as modifying the License.  You may add Your own copyright statement to Your modifications and may provide additional or different license terms and conditions for use, reproduction, or distribution of Your modifications, or for any such Derivative Works as a whole, provided Your use, reproduction, and distribution of the Work otherwise complies with the conditions stated in this License.  5. Submission of Contributions. Unless You explicitly state otherwise, any Contribution intentionally submitted for inclusion in the Work by You to the Licensor shall be under the terms and conditions of this License, without any additional terms or conditions. Notwithstanding the above, nothing herein shall supersede or modify the terms of any separate license agreement you may have executed with Licensor regarding such Contributions.  6. Trademarks. This License does not grant permission to use the trade names, trademarks, service marks, or product names of the Licensor, except as required for reasonable and customary use in describing the origin of the Work and reproducing the content of the NOTICE file.  7. Disclaimer of Warranty. Unless required by applicable law or agreed to in writing, Licensor provides the Work (and each Contributor provides its Contributions) on an \"AS IS\" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied, including, without limitation, any warranties or conditions of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A PARTICULAR PURPOSE. You are solely responsible for determining the appropriateness of using or redistributing the Work and assume any risks associated with Your exercise of permissions under this License.  8. Limitation of Liability. In no event and under no legal theory, whether in tort (including negligence), contract, or otherwise, unless required by applicable law (such as deliberate and grossly negligent acts) or agreed to in writing, shall any Contributor be liable to You for damages, including any direct, indirect, special, incidental, or consequential damages of any character arising as a result of this License or out of the use or inability to use the Work (including but not limited to damages for loss of goodwill, work stoppage, computer failure or malfunction, or any and all other commercial damages or losses), even if such Contributor has been advised of the possibility of such damages.  9. Accepting Warranty or Additional Liability. While redistributing the Work or Derivative Works thereof, You may choose to offer, and charge a fee for, acceptance of support, warranty, indemnity, or other liability obligations and/or rights consistent with this License. However, in accepting such obligations, You may act only on Your own behalf and on Your sole responsibility, not on behalf of any other Contributor, and only if You agree to indemnify, defend, and hold each Contributor harmless for any liability incurred by, or claims asserted against, such Contributor by reason of your accepting any such warranty or additional liability.  END OF TERMS AND CONDITIONS  APPENDIX: How to apply the Apache License to your work.  To apply the Apache License to your work, attach the following boilerplate notice, with the fields enclosed by brackets \"[]\" replaced with your own identifying information. (Don't include the brackets!)  The text should be enclosed in the appropriate comment syntax for the file format. We also recommend that a file or class name and description of purpose be included on the same \"printed page\" as the copyright notice for easier identification within third-party archives.  Copyright [yyyy] [name of copyright owner]  Licensed under the Apache License, Version 2.0 (the \"License\"); you may not use this file except in compliance with the License. You may obtain a copy of the License at  http://www.apache.org/licenses/LICENSE-2.0  Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an \"AS IS\" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.",
    "summary": "Library to declare additional kinds of objects not natively supported by SQLAlchemy/Alembic.",
    "version": "0.15.7",
    "project_urls": null,
    "split_keywords": [
        "alembic",
        " declarative",
        " function",
        " grant",
        " mysql",
        " postgresql",
        " role",
        " schema",
        " snowflake",
        " sqlalchemy",
        " sqlite",
        " trigger",
        " view"
    ],
    "urls": [
        {
            "comment_text": "",
            "digests": {
                "blake2b_256": "41ee31b29904c247c944b503ecac94163787564f016526becdd033385dbf5094",
                "md5": "7736891dfbce253897588f2ab9fbd137",
                "sha256": "63589e1b7ac435490b142afe4d3bf81a3be4f18e844573b35e4a55f7d250d431"
            },
            "downloads": -1,
            "filename": "sqlalchemy_declarative_extensions-0.15.7-py3-none-any.whl",
            "has_sig": false,
            "md5_digest": "7736891dfbce253897588f2ab9fbd137",
            "packagetype": "bdist_wheel",
            "python_version": "py3",
            "requires_python": "<4,>=3.8",
            "size": 103236,
            "upload_time": "2024-11-12T14:41:30",
            "upload_time_iso_8601": "2024-11-12T14:41:30.097476Z",
            "url": "https://files.pythonhosted.org/packages/41/ee/31b29904c247c944b503ecac94163787564f016526becdd033385dbf5094/sqlalchemy_declarative_extensions-0.15.7-py3-none-any.whl",
            "yanked": false,
            "yanked_reason": null
        },
        {
            "comment_text": "",
            "digests": {
                "blake2b_256": "690572144f9c2a2d1525af052e2aa580a7c3c83d02060d7df455d1d967a875d8",
                "md5": "ea90acbf31163715023f00c8eddf240f",
                "sha256": "149bf853699daa1700c0edd1217fa15ad1d4f8b84aa8c92d60af5b93a706b518"
            },
            "downloads": -1,
            "filename": "sqlalchemy_declarative_extensions-0.15.7.tar.gz",
            "has_sig": false,
            "md5_digest": "ea90acbf31163715023f00c8eddf240f",
            "packagetype": "sdist",
            "python_version": "source",
            "requires_python": "<4,>=3.8",
            "size": 235786,
            "upload_time": "2024-11-12T14:41:31",
            "upload_time_iso_8601": "2024-11-12T14:41:31.457559Z",
            "url": "https://files.pythonhosted.org/packages/69/05/72144f9c2a2d1525af052e2aa580a7c3c83d02060d7df455d1d967a875d8/sqlalchemy_declarative_extensions-0.15.7.tar.gz",
            "yanked": false,
            "yanked_reason": null
        }
    ],
    "upload_time": "2024-11-12 14:41:31",
    "github": false,
    "gitlab": false,
    "bitbucket": false,
    "codeberg": false,
    "lcname": "sqlalchemy-declarative-extensions"
}
        
Elapsed time: 0.41689s