8.8.3. Linking MySQL tables into OpenLink Virtuoso

  1. Start the Virtuoso Web User Interface

    Figure 8.392. Start


  2. Select the "Conductor" link in the Left Frame and Login as the "dba" user.

    Figure 8.393. Conductor


  3. Select the "Databases" -> "External Data Source" -> "Data Sources" tab menu items

    Figure 8.394. Databases


  4. Select the "Connect" button for the "mysqlma" MySQL DSN.

    Figure 8.395. Connect


  5. On successful connection Select the "Link Objects" button to obtain a list of available tables

    Figure 8.396. Link Objects

    Link Objects

  6. Select all the tables that are part of the "mysql" catalog.

    Figure 8.397. Select tables

    Select tables

  7. Ensure a primary key is assigned to all table that are to be used in the EDM generation phase.

    Figure 8.398. Catalog


  8. Change the Catalog for each table to be "mysql" using the "Set All" button.

  9. Select the "Link" button to link the selected tables into Virtuoso

    Figure 8.399. "Link" button

    "Link" button

  10. On completion of the Link process the tables will be displayed in the "External Linked Objects" tab.

    Figure 8.400. Completion


  11. The linked tables can be queried by clicking on the hyperlink in the "Local Name" column of the "External Linked Objects" tab above, which loads the Virtuoso "Interactive SQL" interface with the required SQL "Select" for retrieving the remote table data . We shall use the "mysql.mysqlma.artist" table to demonstrate this.

    Figure 8.401. Completion


  12. Then click the "Execute" button to run the query and retrieve the results from the remote table.

    Figure 8.402. Completion


  13. The tables can also be viewed as part of the Virtuoso "SQL Schema Objects" under the "mysql" catalog name.

    Figure 8.403. view tables

    view tables

    The Link process is now complete enabling the tables to be queried as if part of the Virtuoso Schema.