Second Milestone of R2DBC SPI 0.9 Released

Dear R2DBC Community,

We are thrilled to announce the second first milestone of the R2DBC 0.9 specification (0.9.0.M2) that ships several changes. One of them is a long-awaited feature to consume out parameters from stored procedures. Here’s a short summary of the changes:

• Consumption of OUT Parameters by introducing OutParameters. Row and OutParameters now share the common superinterface Readable.
• Introduction of the Result.map(Function<Readable, T>) method.
• Introduction of the Result.Segment API type hierarchy and Result.filter(Predicate<Segment>) and Result.flatMap(Function<Segment, Publisher<T>>) methods to consume arbitrary statement results.
• Lifecycle support by introducing the Lifecycle interface.
• Removal of generic type of ConnectionFactoryOptions.getValue(Option) and getRequiredValue(…).
• Deprecate RowMetadata.getColumnNames() and introduce RowMetadata.contains(String) to simplify constraints and usage around column presence checks.
• Support for Lock Wait and Statement Timeouts through Connection.setLockWaitTimeout(Duration) and Connection.setStatementTimeout(Duration) methods.

This release provides a stable revision of the specification for R2DBC implementors. We expect drivers and implementations to adopt these changes within the next weeks so that we can expect implementations to be available during August where we plan to finish the milestone release train with the bill of materials.

• Mailing list: https://groups.google.com/g/r2dbc
• Changelog: https://r2dbc.io/spec/0.9.0.M2/CHANGELOG.txt
• Specification document: https://r2dbc.io/spec/0.9.0.M2/spec/html/
• Javadoc: https://r2dbc.io/spec/0.9.0.M2/api/