Relational Databases with Control-ADO

The DB interfaces in WinCC OA offer the possibility of an access to external databases.

Under Windows the connection is made via the ADO standard. ADO (ActiveX Data Objects) is an interface developed by Microsoft for the manufacturer-independent access to all types of data sources, particularly databases. The data source for ADO is an OLE DB provider, ODBC-compatible databases may, however, also be addressed via an internal wrapper.

You can find an example of the ADO access to the OLE DB provider in the source directory, WinCC_OA_Path/source/SampleHistDB.xls.

Under Linux the Qt library (Qt) is used as interface for relational databases. The access is made either directly by means of the Native DB-API or by ODBC (www.unixodbc.org).