R2DBC Postgres connection fails - spring-boot

Question

My connection config:
#Configuration
#EnableR2dbcRepositories
public class DatabaseConfiguration extends AbstractR2dbcConfiguration {
#Bean
public PostgresqlConnectionFactory connectionFactory() {
return new PostgresqlConnectionFactory(PostgresqlConnectionConfiguration.builder()
.host("r2dbc:postgresql://mydb.alfa")
.port(5432)
.username("admin")
.database("postgres")
.password(password)
.build()
);
}
}
My repository:
public interface ReactiveOdometerRepository extends ReactiveCrudRepository<OdometerEntity, String> {
Flux<OdometerEntity> findTop1By(String name);
}
My entity:
#Setter
public class OdometerEntity {
#Getter
#Id
private String name;
#Getter
private int value;
}
When I try querying the DB, it fails:
#PostMapping(value = "/query", produces = MediaType.APPLICATION_JSON_VALUE)
public int get(#RequestBody RequestObject request) {
return odometerRepository.findTop1ByName(request.getName()).getValue();
Error:
io.r2dbc.postgresql.PostgresqlConnectionFactory$PostgresConnectionException:
Cannot connect to r2dbc:postgresql://mydb.alfa/<unresolved>:5432
Not sure what the unresolved is doing in there.
How do I fix this error? thanks

Answer 1

You have to specify host name in the host, not the url there
PostgresqlConnectionFactory(
PostgresqlConnectionConfiguration.builder()
.host("localhost")
.database("blogdb")
.username("user")
.password("password")
.codecRegistrar(
EnumCodec
.builder()
.withEnum("post_status", Post.Status.class)
.build()
)
.build()
)
There are a few r2dbc connectionfactory examples from my Github.

Answer 2

Your host variable is wrong. It should contain only the name or ip-address of the host not the full URL.
So instead of host("r2dbc:postgresql://mydb.alfa") use host("mydb.alfa").
#Bean
public PostgresqlConnectionFactory connectionFactory() {
return new PostgresqlConnectionFactory(PostgresqlConnectionConfiguration.builder()
.host("mydb.alfa")
.port(5432)
.username("admin")
.database("postgres")
.password(password)
.build()
);
}