How can I insert and get last inserted id in mysql with transactions using quarkus reactive mysql client with mutiny api - reactive

Question

How would i go about creating a transaction, inserting a row, committing the transaction and getting the last inserted id. So the method should return a Uni<Integer>. I'm new to the mutiny api, I previously used the vertx.io chaining future handlers mechanism, and so it's a bit tough readjusting myself to work with the mutiny api. I have checked the documentation and think something similar to the following snippet should work, but i'm stumped on how to make it work and return Uni<Integer> from the last query instead of Uni<Void> from the tx.commit()
return this.client.begin()
.flatMap(tx -> tx
.preparedQuery("INSERT INTO person (firstname,lastname) VALUES ($1,$2)")
.execute(Tuple.of(person.getFirstName(),person.getLastName()))
.onItem().produceUni(id-> tx.query("SELECT LAST_INSERT_ID()"))
.onItem().produceUni(res -> tx.commit())
.onFailure().recoverWithUni(ex-> tx.rollback())
);

Answer 1

Try this:
return client.begin().onItem().produceUni(tx -> tx
.preparedQuery("INSERT INTO person (firstname,lastname) VALUES ($1,$2)").execute(Tuple.of(person.getFirstName(),person.getLastName()))
.onItem().produceUni(id -> tx.query("SELECT LAST_INSERT_ID()").execute())
.onItem().apply(rows -> rows.iterator().next().getInteger(0))
.onItem().produceUni(item -> tx.commit().on().item().produceUni(v -> Uni.createFrom().item(item)))
.on().failure().recoverWithUni(throwable -> {
return tx.rollback().on().failure().recoverWithItem((Void) null)
.on().item().produceUni(v -> Uni.createFrom().failure(throwable));
})
);
A SqlClientHelper is coming to Quarkus in a future version (hopefully 1.6). You will be able to simplify to:
return SqlClientHelper.inTransactionUni(client, tx -> tx
.preparedQuery("INSERT INTO person (firstname,lastname) VALUES ($1,$2)").execute(Tuple.of(person.getFirstName(),person.getLastName()))
.onItem().produceUni(id -> tx.query("SELECT LAST_INSERT_ID()").execute())
.onItem().apply(rows -> rows.iterator().next().getInteger(0))
);