MySQL

This writer sends data to a MySQL or MariaDB database.

Create New Configuration

Find the MySQL writer in the list of writers and create a new configuration. Name it.

Screenshot - Create configuration

The first step is to Set Up Credentials:

Screenshot - Main page

You need to provide a host name, user name, password, and a database name (MySQL schema).

Screenshot - Credentials

We highly recommend that you create dedicated credentials for the writer in your database. You can use the following SQL code to get started:

CREATE DATABASE writer_sample;
CREATE USER 'writer_sample' IDENTIFIED BY 'Writer_sample1';
GRANT CREATE TEMPORARY TABLES, CREATE, DROP, SELECT, INSERT, UPDATE ON writer_sample.*
    TO writer_sample;

It is also possible to secure the connection using an SSH tunnel.

Table Configuration

The next step is to configure the tables you want to write. Click Add New Table:

Screenshot - Add Table

Select an existing table from Storage:

Screenshot - Select Table

Then specify table configuration. Click the Edit Columns button to configure the table columns:

Screenshot - Configure Table

Use the preview icon to peek at the column contents.

Screenshot - Table Columns

For each column you can specify its

  • name in the destination database; you can also use the select box in the table header to bulk convert the case of all names.
  • data type (one of MySQL data types); you can also use the select box in the table header to bulk set the type for all columns. Setting the data type to IGNORE means that the column will not be present in the destination table.
  • nullable; when checked, the column will be marked as nullable and empty values ('') in that column will be converted to NULL. Use this for non-string columns with missing data.
  • default value; the provided value will be set as the default value of the column in the target table.

When done configuring the columns, don’t forget to save the settings.

Load Options

At the top of the page, you can specify the target table name and additional load options. There are two main options how the writer can write data to tables — Full Load and Incremental Load.

Screenshot - Table Options

In the Incremental Load mode, the data are bulk inserted into the destination table and the table structure must match (including the data types). That means the structure of the target table will not be modified. If the target table doesn’t exist, it will be created. If a primary key is defined on the table, the data is upserted. If no primary key is defined, the data is inserted.

In the Full Load mode, the table is completely overwritten including the table structure. The table is removed using the DROP command and recreated. The DROP command needs to acquire a table-level lock. This means that if the database is used by other applications which acquire table-level locks, the writer may freeze waiting for the locks to be released.

Additionally, you can specify a primary key of the table, a simple column data filter, and a filter for incremental processing.