Spring + R2DBC：如何关闭DatabaseClient和TransactionalOperator？

Question

I can create DatabaseClient and TransactionalOperator in my Spring Boot app using:

@Autowired public App(ConnectionFactory factory) {
    DatabaseClient dc = DatabaseClient.create(factory);
    TransactionalOperator to = TransactionalOperator.create(new R2dbcTransactionManager(factory));
}

But how do I close the DatabaseClient and TransactionalOperator and free the connections/resources?

Is this the best way to create the database connection for R2DBC in a Spring Boot app?

Answer 1

TL;DR: There's nothing to close unless you use a connection pool .

Spring Data R2DBC's DatabaseClient allocates a connection per invoked operation. It's similar to JdbcTemplate that asks its DataSource to create a Connection for each method that you invoke. Once a method call is finished, it releases (closes) the connection.

Same applies for DatabaseClient . Once an operation finishes, the underlying connection is closed.

When using TransactionalOperator or @Transactional there's a slight change in the behavior but similar to JDBC: R2DBC Connections are bound during an active transaction to the transaction itself which makes DatabaseClient to reuse the same connection until the transaction completes. After a transaction is completed, the bound connection is released.