pgx transaction example improvements #3808
Description
Version
1.28.0
What happened?
The example for how to do transactions with pgx added in #3557 will always run Rollback. The rollback will return an error which appears silent, but isn't if pgx is wrapped in opentelemetry tracing.
Instead of always doing a Rollback I believe you can make a context.WithCancel context and then defer cancel() will rollback the transaction if it's not already committed.
Relevant log output
Database schema
SQL queries
Configuration
Playground URL
No response
What operating system are you using?
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What database engines are you using?
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What type of code are you generating?
No response