The MySQL connector allows querying and creating tables in an external MySQL database. This can be used to join data between different systems like MySQL and Hive, or between two different MySQL instances.
To configure the MySQL connector, create a catalog properties file
etc/catalog named, for example,
mount the MySQL connector as the
Create the file with the following contents, replacing the
connection properties as appropriate for your setup:
connector.name=mysql connection-url=jdbc:mysql://example.net:3306 connection-user=root connection-password=secret
connection-url defines the connection information and parameters to pass
to the MySQL JDBC driver. The supported parameters for the URL are
available in the MySQL Developer Guide.
For example, the following
connection-url allows you to
configure the JDBC driver to interpret time values based on UTC as a timezone on
the server, and serves as a workaround for a known issue.
connection-password are typically required and
determine the user credentials for the connection, often a service user.
Multiple MySQL Servers#
You can have as many catalogs as you need, so if you have additional
MySQL servers, simply add another properties file to
with a different name (making sure it ends in
example, if you name the property file
will create a catalog named
sales using the configured connector.
The MySQL connector provides a schema for every MySQL database.
You can see the available MySQL databases by running
SHOW SCHEMAS FROM mysql;
If you have a MySQL database named
web, you can view the tables
in this database by running
SHOW TABLES FROM mysql.web;
You can see a list of the columns in the
clicks table in the
using either of the following:
DESCRIBE mysql.web.clicks; SHOW COLUMNS FROM mysql.web.clicks;
Finally, you can access the
clicks table in the
SELECT * FROM mysql.web.clicks;
If you used a different name for your catalog properties file, use
that catalog name instead of
mysql in the above examples.
MySQL Connector Limitations#
The following SQL statements are not yet supported:
CREATE TABLE (CREATE TABLE AS is supported)