Database :: schemaVersion - Schema version
The property contains the schema version for which the database has been opened, i.e. the managed version for the dictionary or resource database. This is the last schema version, in most cases, but when opening the database for an older schema version, the older version number is stored in this property.
Return value: Scheme version ( int32 )
Schema versions are numbered consecutively beginning with 0. In order to refer to the current schema version, the version value may be set to -1.