feat: support PostgreSQL isolation level statements #3706
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Add a `default_isolation_level` property for the Connection API. This property will be used by the JDBC driver and PGAdapter to set a default isolation level for all read/write transactions that are executed by a connection. Support for setting an isolation level for a single transaction will be added in a follow-up pull request.
Add an option to specify the isolation level for a single transaction. This isolation level overrides the current default isolation level that has been set for the connection. This option only has an effect for read/write transactions.
Adds support for PostgreSQL-dialect SQL statements for setting the isolation level of a transaction.
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| Package | Type | Package file | Manager | Update | Change | |---|---|---|---|---|---| | [com.google.cloud:google-cloud-spanner](https://github.com/googleapis/java-spanner) | dependencies | misk/gradle/libs.versions.toml | gradle | minor | `6.89.0` -> `6.90.0` | --- ### Release Notes <details> <summary>googleapis/java-spanner (com.google.cloud:google-cloud-spanner)</summary> ### [`v6.90.0`](https://github.com/googleapis/java-spanner/blob/HEAD/CHANGELOG.md#6900-2025-03-31) ##### Features - Add default_isolation_level connection property ([#​3702](googleapis/java-spanner#3702)) ([9472d23](googleapis/java-spanner@9472d23)) - Adds support for Interval datatype in Java client ([#​3416](googleapis/java-spanner#3416)) ([8be8f5e](googleapis/java-spanner@8be8f5e)) - Integration test for End to End tracing ([#​3691](googleapis/java-spanner#3691)) ([bf1a07a](googleapis/java-spanner@bf1a07a)) - Specify isolation level per transaction ([#​3704](googleapis/java-spanner#3704)) ([868f30f](googleapis/java-spanner@868f30f)) - Support PostgreSQL isolation level statements ([#​3706](googleapis/java-spanner#3706)) ([dda2e1d](googleapis/java-spanner@dda2e1d)) </details> --- ### Configuration 📅 **Schedule**: Branch creation - "after 6pm every weekday,before 2am every weekday" in timezone Australia/Melbourne, Automerge - At any time (no schedule defined). 🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied. ♻ **Rebasing**: Never, or you tick the rebase/retry checkbox. 🔕 **Ignore**: Close this PR and you won't be reminded about this update again. --- - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box --- This PR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate). GitOrigin-RevId: a63885015974acb6061bae5ca3b9d61136991376
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Adds support for PostgreSQL-dialect SQL statements for setting the isolation level of a transaction.