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%META:TOPICPARENT{name="VirtLinkRemoteTables"}%
---+ Linking ODBC-accessible Database Objects (Tables, Views, and Stored Procedures) into Virtuoso
---++ Prerequisites
* <b>Virtuoso Universal Server, Commercial Edition</b>%BR%
Virtuoso Universal Server Release 6.x or later is recommended, optimally the latest version available.%BR%%BR%
* <b>ODBC Driver for RDBMS or other Data Source</b>%BR%
The Virtuoso Server uses an ODBC Driver for the RDBMS or other Data Source to link in the external Schema Objects (Tables, Views, and Stored Procedures). The Microsoft-supplied, Windows-bundled <b><nop>ODBC Driver for Microsoft Access</b> will be used in this document, and a functional ODBC Data Source Name (DSN) of <b><code>odbcma</code></b> will be assumed to exist on the machine hosting the Virtuoso Server. Any ODBC compliant driver should work.%BR%%BR%
* <b>RDBMS or other Data Source</b>%BR%
A DBMS hosting the required Schema Objects (Tables, Views, and Stored Procedures) needs to be available. This may be on any host which is TCP/IP accessible from the Virtuoso Server host. In this document, the Microsoft Access <b>Northwind</b> sample database will be used to demonstrate the process.%BR%%BR%
---++ Steps
1 Start the Virtuoso Web User Interface.
%BR%%BR%<img src="%ATTACHURLPATH%/VirtWebHome.png" style="wikiautogen"/>%BR%%BR%
1 Select the *Conductor* link in the left frame and login as the *dba* user.
%BR%%BR%<img src="%ATTACHURLPATH%/VirtConductor.png" style="wikiautogen"/>%BR%%BR%
1 Select the *Databases* -> *External Data Source* -> *Data Sources* tab menu items.
%BR%%BR%<img src="%ATTACHURLPATH%/VirtLinkODBC1.png" style="wikiautogen"/>%BR%%BR%
1 Select the *Connect* button for the *odbcma* ODBC to ODBC Bridge DSN.
%BR%%BR%<img src="%ATTACHURLPATH%/VirtLinkODBC2.png" style="wikiautogen"/>%BR%%BR%
1 On succesful connection, select the *Link Objects* button to obtain a list of available tables.
%BR%%BR%<img src="%ATTACHURLPATH%/VirtLinkODBC3.png" style="wikiautogen"/>%BR%%BR%
1 Select all the tables that are part of the *Northwind* catalog.
%BR%%BR%<img src="%ATTACHURLPATH%/VirtLinkODBC4.png" style="wikiautogen"/>%BR%%BR%
1 Change the Catalog for each table to be *NWIND* using the *Set All* button.
%BR%%BR%<img src="%ATTACHURLPATH%/VirtLinkODBC5.png" style="wikiautogen"/>%BR%%BR%
1 All the catalog names are changed to be *NWIND*.
%BR%%BR%<img src="%ATTACHURLPATH%/VirtLinkODBC6.png" style="wikiautogen"/>%BR%%BR%
1 Select the *Link* button to link the selected tables into Virtuoso.
%BR%%BR%<img src="%ATTACHURLPATH%/VirtLinkODBC7.png" style="wikiautogen"/>%BR%%BR%
1 On completion of the link process, the tables will be displayed in the *External Linked Objects* tab.
%BR%%BR%<img src="%ATTACHURLPATH%/VirtLinkODBC8.png" style="wikiautogen"/>%BR%%BR%
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 *NWIND.odbcma.Customers* table to demonstrate this.
%BR%%BR%<img src="%ATTACHURLPATH%/VirtLinkODBC10.png" style="wikiautogen"/>%BR%%BR%
1 Click the *Execute* button to run the query and retrieve the results from the remote table.
%BR%%BR%<img src="%ATTACHURLPATH%/VirtLinkODBC11.png" style="wikiautogen"/>%BR%%BR%
1 The tables can also be viewed as part of the Virtuoso *SQL Schema Objects* under the *NWIND* catalog name.
%BR%%BR%<img src="%ATTACHURLPATH%/VirtLinkODBC9.png" style="wikiautogen"/>%BR%%BR%
The link process is now complete, enabling the tables to be queried as if local to the Virtuoso instance.
---++ Related
* [[VOSSQL2RDF][Mapping SQL Data to Linked Data Views]]
* [[VirtODBCEntityFrameworkUsage][ Using Microsoft Entity Frameworks to Access Remote ODBC-accessible Schema Objects (Tables, Views, and Stored Procedures) with Virtuoso, via an ODBC-to-ODBC Bridge]]
CategoryDocumentation CategoryVirtuoso CategoryEntityFrameworks CategoryDotNET CategoryODBC CategoryODBCODBCBridge
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