Std.Db.withTransaction

fn

This is a callable function.

What it does

Run an action inside a transaction, and undo it if the action failed.

There is no rollback a caller can forget. A transaction left open holds

every row it touched against every other connection until something closes

it, and a caller that returned early on a failure — which is exactly when a

rollback matters most — is the commonest way one is left open.

A commit that itself fails is answered as a failure rather than swallowed:

a caller told its work was kept, when the server refused to keep it, would

carry on from a state that does not exist.

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• Result makes success and recoverable failure part of the function's type.