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---+ Linking Ingres Database Objects into Virtuoso

---++ Steps

   1 Start the Virtuoso Web User Interface.
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   1 Select the *Conductor* link in the left frame and login as the *dba* user.
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   1 Select the *Databases* -> *External Data Source* -> *Data Sources* tab menu items.
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   1 Click the *Connect* button for the *Ing10ma* Ingres DSN.
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   1 On succesful connection, select the *Link Objects* button to obtain a list of available tables.
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   1 Select all the tables that are part of the *TUT* catalog, and press the *Link* button to commence the linking process.
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   1 Change the Catalog for each table to *TUT* using the *Set All* button.
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   1 All the catalog names are changed to *TUT*.   
   1 Click the *Link* button to link the selected tables into Virtuoso.
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   1 On completion of the Link process, the tables will be displayed on the *External Linked Objects* tab.
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   1 The linked tables can be queried by clicking on the hyperlink in the *Local Name* column of the *External Linked Objects* tab above. This loads the Virtuoso *Interactive SQL* interface with the required SQL *Select* for retrieving the remote table data . We shall use the <b>TUT.ingma.book_list</b> table to demonstrate this.
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   1 Click the *Execute* button to run the query and retrieve the results from the remote table.
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   1 The tables can also be viewed as part of the Virtuoso *SQL Schema Objects* under the *TUT* catalog name.
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The Link process is now complete enabling the tables to be queried as if part of the Virtuoso Schema.

---++ Related

   * [[VOSSQL2RDF][Mapping SQL Data to Linked Data Views]]
   * [[VirtIngresEntityFrameworkUsage][Using Microsoft Entity Frameworks to Access Ingres Schema Objects with Virtuoso]]


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