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OpenEdge Data Management: DataServer for ODBC
The DataServer Tutorial : Adding extended ABL support
 

Adding extended ABL support

The DataServer provides support for arrays, case-insensitive indexed fields, and the ABL ROWID function when certain objects exist in an ODBC data source. You can modify your data source to support these extended features. You can also add support for these features when you create new tables.
The DataServer maintains the columns that you add to your ODBC data-source tables to support these extended features. If non-OpenEdge applications are updating those data-source tables, these applications must be aware of the additional columns and update them appropriately. You can use triggers, if your data source supports them, to make sure that the columns are updated correctly.
The following sections describe how to modify an existing ODBC data source so that it supports arrays, case-insensitive indexes, and OpenEdge record identifiers. See ROWID function for alternate ways to support this function.
In this section: 
* Modifying tables to support arrays
* Modifying tables to support case-insensitive indexes