Follow OpenTelemetry convention

[gitmalong]

According to your docs expanded code example I could not see that sql statements are packed into the db.statement field. Would be great if those conventions can be followed upon:

https://opentelemetry.io/docs/reference/specification/trace/semantic_conventions/database/

[hinohi]

Thanks for telling me.
I will change the implementation to conform to the official specifications as much as possible.

[gitmalong]

There is also an open PR at the sqlx crate to implement tracing directly into there. launchbadge/sqlx#2185 (comment)

[hinohi]

• otel spec に対応して db.statement や code.lineno を利用するようにしました
• sqlx の tracing は log のみであり、引き続きこのライブラリは有用なようです