WireDatabaseDialect::getRetryableErrorType()

Classify a query exception as a transient error that may be resolved by retrying

Since error codes are specific to the database engine, classification lives here in the dialect. Returns one of the following, or blank string when the error is not a known transient condition:

• deadlock: Server chose this statement as a deadlock victim or could not serialize it, and has already rolled back the entire transaction. No reconnect is needed, so it is safe to retry when no transaction is open (otherwise the whole transaction must be retried instead).
• gone-away: Server closed an idle connection. Retry requires a reconnect, which discards any open transaction.
• comm-failure: Connection to server failed mid-query. Retry requires a reconnect, which discards any open transaction.

Available since version 3.0.272.