Release Notes for MariaDB Connector/Node.js 3.0.2

Overview

MariaDB Connector/Node.js is the interface between Node.js applications and MariaDB Server. MariaDB Connector/Node.js enables development of Node.js applications.

MariaDB Connector/Node.js 3.0.2 was released on 2022-10-27. This release is of General Availability (GA) maturity.

Notable Changes

  • Added the executeStream() method, which uses the event-driven architecture to process rows one by one, reducing the memory needed for processing. (CONJS-222)

    • executeStream() is a replacement for the execute() method in cases where the entire result set is too large to fit into memory.

    • The client must receive the entire result set in less time than defined by the net_read_timeout system variable or the read will be aborted. If the default value (30 seconds) is too short, you might need to configure a higher value.

    • The following example shows how to call the new executeStream() method using for-await-of (available starting with Node.js 10):

      const prepare = await shareConn.prepare('SELECT * FROM mysql.user where host = ?');
const stream = prepare.executeStream(['localhost']);
try {
 for await (const row of stream) {
   console.log(row);
 }
} catch (e) {
 queryStream.close();
}
prepare.close();

    • The following example shows how to call the new executeStream() method using events:

      const prepare = await shareConn.prepare('SELECT * FROM mysql.user where host = ?');
prepare.executeStream(['localhost'])
    .on("error", err => {
      console.log(err); //if error
    })
    .on("fields", meta => {
      console.log(meta); // [ ...]
    })
    .on("data", row => {
      console.log(row);
    })
    .on("end", () => {
      //ended
      prepare.close();
    });

  • Improved performance of the prepared statement cache. (CONJS-228)

  • Removed the please-upgrade-node package dependency. (CONJS-216)

  • For compatibility, some error codes have been updated to match the values from MariaDB Community Server 10.9. (CONJS-213)

Issues Fixed

  • The name metadata column can become corrupted. (CONJS-223)

  • When a connection is re-used with a connection pool, the session timezone is reset, which results in incorrect dates and times. (CONJS-211)

  • When a connection pool is used and the leakDetectionTimeout parameter is set to a non-zero value, an error is raised. (CONJS-212)

    • In previous releases, the following error is raised:

      /root/node_modules/mariadb/lib/pool.js:439
      if (value.leaked) counter++;
               ^

TypeError: Cannot read properties of null (reading 'leaked')

  • When connecting to a MySQL 8.0 server with caching_sha2_password, fast authentication using the server-side cache does not work. (CONJS-217)

    • In previous releases, the implementation of caching_sha2_password in Connector/Node.js requires the full authentication process to be performed each time a user connects.

    • Starting with this release, the implementation of caching_sha2_password in Connector/Node.js only requires the full authentication process to be performed the first time a user connects, and the user's subsequent connections can be authenticated against the server-side cache.

  • When batch inserts are performed or the pool.batch() method is called, the prepareCacheLength parameter does not properly restrict the size of the prepared statement cache. (CONJS-219)

  • When the idleTimeout parameter is set to 0, the idle connection timeout is not disabled and is set to 30 minutes instead. (CONJS-227)

  • metaAsArray, checkNumberRange, and pool.closed TypeScript options are not available. (CONJS-226, CONJS-224, CONJS-214)

  • When a prepared statement is executed after being closed, a ER_UNKNOWN_STMT_HANDLER error code is raised, which does not clearly mention the cause of the problem. (CONJS-215)

    • In previous releases, the following error is raised:

      'Unknown prepared statement handler (1) given to mysqld_stmt_execute'

    • Starting with this release, the following error is raised:

      'Execute fails, prepare command has already been closed'

Upgrade

MariaDB Connector/Node.js 3.0 is fully compatible with MariaDB Connector/Node.js 3.3. As a new fully compatible major version, MariaDB Connector/Node.js 3.3 supersedes MariaDB Connector/Node.js 3.0, and users should upgrade to 3.3.