feat: support stale reads #146
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IlyaFaer
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Nov 16, 2021
IlyaFaer
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Nov 16, 2021
| @listens_for(Pool, "reset") | ||
| def reset_connection(dbapi_conn, connection_record): | ||
| """An event of returning a connection back to a pool.""" | ||
| dbapi_conn.connection.staleness = None |
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According to the docs, connection the hook to the Pool class will connect it to all the pools used by the dialect. In the test below a QueuedPool is used (by default), and it's working fine.
larkee
reviewed
Nov 17, 2021
| @@ -167,6 +167,14 @@ Note that execution options are applied lazily - on the `execute()` method call, | |||
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| ReadOnly/ReadWrite mode of a connection can't be changed while a transaction is in progress - first you must commit or rollback it. | |||
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| ### Stale reads | |||
| To use the Spanner [Stale Reads](https://cloud.google.com/spanner/docs/reads#perform-stale-read) with SQLAlchemy you can tweak the connection execution options with a wanted staleness value. For example: | |||
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Read timestamp and minimum read timestamp expect a datetime.datetime object.
Maximum staleness and exact staleness expect a datetime.timedelta object.
This should probably be documented here in some way, possibly with examples for each, WDYT?
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Okay, added examples for all of them
added 3 commits
November 17, 2021 12:46
larkee
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Nov 19, 2021
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🤖 I have created a release \*beep\* \*boop\* --- ## [1.0.0](https://www.github.com/googleapis/python-spanner-sqlalchemy/compare/v0.1.0...v1.0.0) (2021-12-08) ### Features * add code samples ([#55](https://www.github.com/googleapis/python-spanner-sqlalchemy/issues/55)) ([406c34b](https://www.github.com/googleapis/python-spanner-sqlalchemy/commit/406c34bdb21e01a1317c074fab34d87bb3d61020)) * set user-agent string to distinguish SQLAlchemy requests ([#116](https://www.github.com/googleapis/python-spanner-sqlalchemy/issues/116)) ([b5e1a21](https://www.github.com/googleapis/python-spanner-sqlalchemy/commit/b5e1a211a0475690feed36fd222a41c216d8fb82)) * support computed columns ([#139](https://www.github.com/googleapis/python-spanner-sqlalchemy/issues/139)) ([046ca97](https://www.github.com/googleapis/python-spanner-sqlalchemy/commit/046ca975778f4793e2c37d70d2a602546f9d4699)), closes [#137](https://www.github.com/googleapis/python-spanner-sqlalchemy/issues/137) * support JSON data type ([#135](https://www.github.com/googleapis/python-spanner-sqlalchemy/issues/135)) ([184a7d5](https://www.github.com/googleapis/python-spanner-sqlalchemy/commit/184a7d576a790bbbd049fe80d589af78831379b4)) * support read_only connections ([#125](https://www.github.com/googleapis/python-spanner-sqlalchemy/issues/125)) ([352c47d](https://www.github.com/googleapis/python-spanner-sqlalchemy/commit/352c47de7bb4ea1c30b50a7fe5aee0c4d102e80e)) * support stale reads ([#146](https://www.github.com/googleapis/python-spanner-sqlalchemy/issues/146)) ([d80cb27](https://www.github.com/googleapis/python-spanner-sqlalchemy/commit/d80cb2792437731c24905c7a6919468c37779c67)) ### Bug Fixes * ALTER COLUMN NOT NULL directive fails because of inappropriate syntax ([#124](https://www.github.com/googleapis/python-spanner-sqlalchemy/issues/124)) ([c433cda](https://www.github.com/googleapis/python-spanner-sqlalchemy/commit/c433cda99fd8544810c878328a272a3a9430630f)) * array columns reflection ([#119](https://www.github.com/googleapis/python-spanner-sqlalchemy/issues/119)) ([af3b97b](https://www.github.com/googleapis/python-spanner-sqlalchemy/commit/af3b97bfa4b3ed4b223384c9ed3fa0643204d8c9)), closes [#118](https://www.github.com/googleapis/python-spanner-sqlalchemy/issues/118) * calculate limit value correctly for offset only queries ([#160](https://www.github.com/googleapis/python-spanner-sqlalchemy/issues/160)) ([6844336](https://www.github.com/googleapis/python-spanner-sqlalchemy/commit/684433682ed29d9cde8c9898796024cefeb38493)) * correct typo in spanner_interleave_on_delete_cascade keyword ([#99](https://www.github.com/googleapis/python-spanner-sqlalchemy/issues/99)) ([a0ebf75](https://www.github.com/googleapis/python-spanner-sqlalchemy/commit/a0ebf758eda351c0a20103f9e8c2243f002b2e6e)) * raise Unimplemented error when creating temporary tables ([#159](https://www.github.com/googleapis/python-spanner-sqlalchemy/issues/159)) ([646d6ac](https://www.github.com/googleapis/python-spanner-sqlalchemy/commit/646d6ac24ccd0643b67abff9da28118e0a6f6e55)) * rollback failed exception log ([#106](https://www.github.com/googleapis/python-spanner-sqlalchemy/issues/106)) ([809e6ab](https://www.github.com/googleapis/python-spanner-sqlalchemy/commit/809e6abb29f82a7fbe6587d606e8d75283f2a2fe)) ### Documentation * add query hints example ([#153](https://www.github.com/googleapis/python-spanner-sqlalchemy/issues/153)) ([9c23804](https://www.github.com/googleapis/python-spanner-sqlalchemy/commit/9c23804746bc8c638b6c22f2cb6ea57778f7fd19)) * reformatted README titles ([#141](https://www.github.com/googleapis/python-spanner-sqlalchemy/issues/141)) ([a3ccbac](https://www.github.com/googleapis/python-spanner-sqlalchemy/commit/a3ccbac476679fe8048ed2109e5489b873278c9c)) * update benchmarks ([#155](https://www.github.com/googleapis/python-spanner-sqlalchemy/issues/155)) ([3500653](https://www.github.com/googleapis/python-spanner-sqlalchemy/commit/35006536e4de31dbcba022b73f0aadf39bc89e39)) ### Miscellaneous Chores * setup release 1.0.0 ([#165](https://www.github.com/googleapis/python-spanner-sqlalchemy/issues/165)) ([37a415d](https://www.github.com/googleapis/python-spanner-sqlalchemy/commit/37a415d071d39e99f233a1c15c1c4b89bd436570)) --- This PR was generated with [Release Please](https://github.com/googleapis/release-please). See [documentation](https://github.com/googleapis/release-please#release-please).
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