Connecting to MySQL

Operation Steps

Please follow the steps below to connect to a MySQL data source.

1. Click "New Data Connection" in the upper right corner of the data connection page.

2. Select the MySQL data source from the data source types.

3. Fill in the required parameters for the data source connection as prompted.

   Connection Configuration Information Description

   Field	Description
   Name	The name of the connection. Required and unique within the user
   Host Address	The address of the database. If the url field is filled, the url will take precedence
   Port	The port of the database. If the url field is filled, the url will take precedence
   Username	The username for the database
   Password	The password for the database
   Database	The name of the database
   Max Connections	The maximum number of connections in the connection pool
   Encoding	The encoding setting for the database connection
   Prefer using database comment as dataset title	Choose whether to display the table name or the table comment as the title
   Use Azure MySQL 8.0.15	Due to a version number passing bug in Azure MySQL 8.0.15 (see Limitations in Azure Database for MySQL), if you need to connect to this version of MySQL on Azure, please set this parameter to 'Enabled'
   URL	The JDBC url of the database
   Transaction isolation level for read operations	This setting only affects reading data; writing data still uses the default isolation level
   Hierarchical loading of schema and tables	Default is Off. When enabled, schemas and tables are loaded hierarchically; only schemas are loaded during connection, and you need to click the schema to load the tables under it
   Query timeout (seconds)	Default is 600. When the data volume is large, you can appropriately increase the timeout
   Allow write operations	Indicates that this connection can be selected as an output connection in Data Integration and Batch Sync. You must have write permission to the database and pass verification before configuring this parameter.
   Support uploading files to specified path	Indicates the database name where the generated table will be stored when creating a local file dataset. You must have write permission to the database and pass verification before configuring this parameter.
   Only display tables under specified database/schema	When this option is selected and the database field is not empty, only tables under this db will be displayed

4. After filling in the parameters, click the Validate button to get the validation result (this checks the connectivity between HENGSHI SENSE and the configured data connection; you cannot add the connection if validation fails).

5. After validation passes, Allow write operations and Support uploading files to specified path will change from disabled to enabled, and you can choose whether to enable these options.

6. Click Execute Preset Code to pop up the preset code for this data source, then click the execute button.

7. Click the "Add" button to add the MySQL connection.

Please Note

1. Parameters marked with * are required; others are optional.
2. MySQL 5 and below do not support window functions, so Advanced Calculation is not supported; you must enable the Acceleration Engine to support it.
3. Due to a version number passing bug in Azure MySQL 8.0.15, if you need to connect to this version of MySQL on Azure, you need to specifically set the Use Azure MySQL option.
4. When connecting to a data source, you must execute the preset code. Failure to do so will result in certain functions being unavailable during data analysis. In addition, when upgrading from a version prior to 4.4 to 4.4, you need to execute the preset code for existing data connections in the system.

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Supported MySQL Versions

5.5, 5.6, 5.7, and 8.0

Data Connection Preview Support

Supports regular table and view tables that can be listed by show tables.

SQL Dataset Support for SQL

All SELECT-related features are supported, and the SELECT SQL statement must comply with MySQL syntax specifications.

Connection Authentication Instructions

Username and password authentication is supported. SSL, PAM, and other authentication methods are not supported.

Unsupported Field Types

The following field types in MySQL cannot be processed correctly:

• TIME
• GEOMETRY
• POINT
• LINESTRING
• POLYGON
• MULTIPOINT
• MULTILINESTRING
• MULTIPOLYGON
• GEOMETRYCOLLECTION