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MySQL Connector/Node.js 8.0.16 has been released
Posted by: Gipson Pulla
Date: April 25, 2019 09:49AM

Dear MySQL users,

MySQL Connector/Node.js is a new Node.js driver for use with the X
DevAPI. This release, v8.0.16, is a maintenance release of the
MySQL Connector/Node.js 8.0 series.

The X DevAPI enables application developers to write code that combines
the strengths of the relational and document models using a modern,
NoSQL-like syntax that does not assume previous experience writing
traditional SQL.

MySQL Connector/Node.js can be downloaded through npm (see for details) or from

To learn more about how to write applications using the X DevAPI, see For more information
about how the X DevAPI is implemented in MySQL Connector/Node.js, and
its usage, see

Please note that the X DevAPI requires at least MySQL Server version
8.0 or higher with the X Plugin enabled. For general documentation
about how to get started using MySQL as a document store, see

Changes in MySQL Connector/Node.js 8.0.16 (2019-04-25, General

X DevAPI Notes

     * Connector/Node.js now supports connection attributes as
       key-value pairs that application programs can pass to the
       server. Connector/Node.js defines a default set of
       attributes, which can be disabled or enabled. In addition
       to these default attributes, applications can also
       provide their own set of custom attributes.

          + Specify connection attributes as a
            connection-attributes parameter in a connection
            string, or by using the connectionAttributes
            property using either a plain JavaScript object or
            JSON notation to specify the connection
            configuration options.
            The connection-attributes parameter value must be
            either empty (the same as specifying true), a
            Boolean value (true or false to enable or disable
            the default attribute set), or a list of zero or
            more key=value pair specifiers separated by commas
            (to be sent in addition to the default attribute
            set). Within a list, a missing key value evaluates
            as NULL.
            The connectionAttributes property allows passing
            user-defined attributes to the application using
            either a plain JavaScript object or JSON notation to
            specify the connection configuration options. Define
            each attribute in a nested object under
            connectionAttributes where the property names
            matches the attribute names, and the property values
            match the attribute values. Unlike
            connection-attributes, and while using plain
            JavaScript objects or JSON notation, if the
            connectionAttributes object contains duplicate keys
            then no error is thrown and the last value specified
            for a duplicate object key is chosen as the
            effective attribute value.
            Not sending the default client-defined attributes:
mysqlx.getSession('{ "user": "root", "connectionAttributes": false }')


mysqlx.getSession({ user: 'root', connectionAttributes: { foo: 'bar',
baz: 'qux', quux: '' } })

       Application-defined attribute names cannot begin with _
       because such names are reserved for internal attributes.
       If connection attributes are not specified in a valid
       way, an error occurs and the connection attempt fails.
       For general information about connection attributes, see
       Performance Schema Connection Attribute Tables

Functionality Added or Changed

     * Optimized the reuse of existing connections through
       client.getSession() by only re-authenticating if

     * For X DevAPI, performance for statements that are
       executed repeatedly (two or more times) is improved by
       using server-side prepared statements for the second and
       subsequent executions. This happens internally;
       applications need take no action and API behavior should
       be the same as previously. For statements that change,
       repreparation occurs as needed. Providing different data
       values or different offset() or limit() values does not
       count as a change. Instead, the new values are passed to
       a new invocation of the previously prepared statement.

Bugs Fixed

     * Idle pooled connections to MySQL Server were not reused,
       and instead new connections had to be recreated. (Bug

     * Executing client.close() would not close all associated
       connections in the connection pool. (Bug #29428477)

     * connectTimeout instead of maxIdleTime determined whether
       idle connections in the connection pool were reused
       rather than creating new connections. (Bug #29427271)

     * Released connections from the connection pool were not
       being reset and reused; instead new connections were
       being made. (Bug #29392088)

     * Date values in documents were converted to empty objects
       when inserted into a collection. (Bug #29179767, Bug

     * A queueTimeout value other than 0 (infinite) prevented
       the acquisition of old released connections from the
       connection pool. (Bug #29179372, Bug #93841)

On Behalf of MySQL/ORACLE RE Team
Gipson Pulla

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MySQL Connector/Node.js 8.0.16 has been released
April 25, 2019 09:49AM

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