Enable the SingleStore JDBC Driver in KNIME

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SingleStore JDBC Driver

Rapidly create and deploy powerful Java applications that integrate with SingleStore.



Use standard data access components in KNIME to create charts and reports with SingleStore data.

One of the strengths of the CData JDBC Driver for SingleStore is its cross-platform support, enabling integration with major BI tools. Follow the procedure below to access SingleStore data in KNIME and to create a chart from SingleStore data using the report designer.

Define a New JDBC Connection to SingleStore Data

  1. Install the Report Designer extension: Click File -> Install KNIME Extensions, and filter on "Report".
  2. In a new workflow, click File -> Preferences and expand the KNIME -> Databases node to add cdata.jdbc.singlestore.jar. The driver JAR is located in the lib subfolder of the installation directory.
  3. In the Node Repository view, expand the Database -> Read/Write node and drag a Database Reader onto the workflow editor.
  4. Double-click the Database Reader and set the following properties:

    • Database Driver: In the menu, select the driver name, cdata.jdbc.singlestore.SingleStoreDriver
    • Database URL: Enter the connection properties. The JDBC URL begins with jdbc:singlestore: and is followed by a semicolon-separated list of connection properties.

      The following connection properties are required in order to connect to data.

      • Server: The host name or IP of the server hosting the SingleStore database.
      • Port: The port of the server hosting the SingleStore database.
      • Database (Optional): The default database to connect to when connecting to the SingleStore Server. If this is not set, tables from all databases will be returned.

      Connect Using Standard Authentication

      To authenticate using standard authentication, set the following:

      • User: The user which will be used to authenticate with the SingleStore server.
      • Password: The password which will be used to authenticate with the SingleStore server.

      Connect Using Integrated Security

      As an alternative to providing the standard username and password, you can set IntegratedSecurity to True to authenticate trusted users to the server via Windows Authentication.

      Connect Using SSL Authentication

      You can leverage SSL authentication to connect to SingleStore data via a secure session. Configure the following connection properties to connect to data:

      • SSLClientCert: Set this to the name of the certificate store for the client certificate. Used in the case of 2-way SSL, where truststore and keystore are kept on both the client and server machines.
      • SSLClientCertPassword: If a client certificate store is password-protected, set this value to the store's password.
      • SSLClientCertSubject: The subject of the TLS/SSL client certificate. Used to locate the certificate in the store.
      • SSLClientCertType: The certificate type of the client store.
      • SSLServerCert: The certificate to be accepted from the server.

      Connect Using SSH Authentication

      Using SSH, you can securely login to a remote machine. To access SingleStore data via SSH, configure the following connection properties:

      • SSHClientCert: Set this to the name of the certificate store for the client certificate.
      • SSHClientCertPassword: If a client certificate store is password-protected, set this value to the store's password.
      • SSHClientCertSubject: The subject of the TLS/SSL client certificate. Used to locate the certificate in the store.
      • SSHClientCertType: The certificate type of the client store.
      • SSHPassword: The password that you use to authenticate with the SSH server.
      • SSHPort: The port used for SSH operations.
      • SSHServer: The SSH authentication server you are trying to authenticate against.
      • SSHServerFingerPrint: The SSH Server fingerprint used for verification of the host you are connecting to.
      • SSHUser: Set this to the username that you use to authenticate with the SSH server.

      Built-in Connection String Designer

      For assistance in constructing the JDBC URL, use the connection string designer built into the SingleStore JDBC Driver. Either double-click the JAR file or execute the jar file from the command-line.

      java -jar cdata.jdbc.singlestore.jar

      Fill in the connection properties and copy the connection string to the clipboard.

      When you configure the JDBC URL, you may also want to set the Max Rows connection property. This will limit the number of rows returned, which is especially helpful for improving performance when designing reports and visualizations.

      A typical JDBC URL is below.

      jdbc:singlestore:User=myUser;Password=myPassword;Database=NorthWind;Server=myServer;Port=3306;
    • User Name: The username used to authenticate.
    • Password: The password used to authenticate.
    • SQL Statement: Enter an SQL query in the SQL Statement box or double-click a table. This article uses the query below to create a chart: SELECT ShipName, ShipCity FROM Orders WHERE ShipCountry = 'USA'
  5. Test the connection by clicking Fetch Metadata.

  6. Connect the Database Reader to a Data to Report node to supply the dataset to a range of data visualization controls. Click Execute and then click Edit Report at the top of the workflow to open the report designer perspective.
  7. You can now generate reports based on live data. To create a chart, drag the chart control from the palette to the report designer. In the resulting wizard, you can use the filtering and aggregation controls available in KNIME.

Troubleshooting

The following list shows how to resolve common errors:

  • Encountered duplicate row Id "Row1": To resolve this error, add the following to the knime.ini file located in your KNIME installation directory:-Dknime.database.fetchsize=0