MariaDB Connector/R2DBC 1.1.4 Release Notes

Overview

MariaDB Connector/R2DBC is a non-blocking interface between Java applications and MariaDB Server. MariaDB Connector/R2DBC enables the development of Java 8+ applications for MariaDB database products.

MariaDB Connector/R2DBC 1.1.4 was released on 2023-03-27. This release is of GA (generally available) maturity. This release is compatible with R2DBC 1.0.0 specification.

Notable Changes

When MariaDB Connector/R2DBC 1.1.4 connects to a pre-existing TLS tunnel, host verification can be disabled. (R2DBC-80)
- The behavior can be configured using the sslTunnelDisableHostVerification Connection Parameter, which defaults to false.
- When the sslMode connection parameter is set to SslMode.TUNNEL, host verification can be disabled by setting sslTunnelDisableHostVerification to true.
- For example:

try {
     // Configure the Connection
     MariadbConnectionConfiguration conf = MariadbConnectionConfiguration.builder()
             .host("192.0.2.1")
             .port(8880) // tunnel port
             .username("db_user")
             .password("db_user_password")
             .database("test")
             .sslMode(SslMode.TUNNEL)
             .sslContextBuilderCustomizer(
                     sslContextBuilder -> sslContextBuilder
                             .protocols("TLSv1.3")
                             .keyManager(new File("/path/to/client/cert"), new File("/path/to/client/key")))
             .sslTunnelDisableHostVerification(true)
             .build();

     // Instantiate a Connection Factory
     MariadbConnectionFactory connFactory = new MariadbConnectionFactory(conf);

     MariadbConnection connection = connFactory.create().block();
     connection.close().block();

 } catch (java.lang.IllegalArgumentException e) {
     System.err.println("Issue encountered while getting connection");
     e.printStackTrace();
 }

When the useServerPrepStmts connection parameter is enabled, prepared statements can use the text protocol. (R2DBC-85)
- To use the text protocol in this scenario, prefix the query string with /text/ when creating the prepared statement.
- For example, to use the text protocol with the native R2DBC API:

connection
     .createStatement("/*text*/ call some_proc(?)")
     .bind(0, "connr2dbc_user@example.edu")
     .execute()
     .flatMap(...);

- Or to use the text protocol with Spring Data:

@Query("/*text*/ call some_proc(:emailparam)")
List<User> findUsersWithEmailAddress(@Param("emailparam") String emailParam);

MariaDB Connector/R2DBC 1.1.4 adds support for decoding TIMESTAMP and DATE "zero" date values ('0000-00-00') from MariaDB Xpand. (R2DBC-83)
- In previous releases, when the connector received a "zero" date value from Xpand, the value could not be decoded and the following error would be raised:

wrong month 0

Issues Fixed

When the useServerPrepStmts connection parameter is enabled, MEDIUMINT values are not properly decoded. (R2DBC-76)
- In Connector/R2DBC 1.1.2 and 1.1.3, when the binary protocol is used, the last byte of a MEDIUMINT value is not read from a result-set, so remaining values from the same row are read incorrectly.
When the Statement.returnGeneratedValues() method is called when connected to a version of MariaDB Server prior to 10.5, an error is raised. (R2DBC-77)
- In previous releases, the following error would be raised:

Cannot invoke "Object.getClass()" because "obj" is null

MariaDB Connector/R2DBC's internal statement parser improperly classifies user-defined variables in SELECT statements as named statement parameters. (R2DBC-79)
- In previous releases, the @amount token in the query below would be classified as a named statement parameter, instead of a user-defined variable.

SELECT @amount := 10;

Since a statement parameter does not exist with that name, the following error would be raised:

java.lang.IllegalStateException: Parameter at position 0 is not set.

Starting with this release, the internal statement parser can distinguish between user-defined variables and named statement parameters.
When a ConnectionFactory is used to construct a connection string from a ConnectionFactoryOptions instance, the restrictedAuth, rsaPublicKey, cachingRsaPublicKey, and allowPublicKeyRetrieval connection parameters are not properly parsed. (R2DBC-81)
When a server does not advertise the CLIENT_SESSION_TRACK capability (such as old versions of MariaDB Server, MySQL, and MariaDB Xpand), the MariadbConnection.getTransactionIsolationLevel() and MariadbConnection.setTransactionIsolationLevel(IsolationLevel isolationLevel) methods do not properly get or set the transaction isolation level. (R2DBC-82)

Resources

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