Module org.apache.derby.engine
Package org.apache.derby.vti

Class VTITemplate

  • All Implemented Interfaces:
    AutoCloseable, ResultSet, Wrapper, AwareVTI
    Direct Known Subclasses:
    ForwardingVTI, SimpleJsonVTI, StringColumnVTI
    public abstract class VTITemplate
extends Object
implements ResultSet, AwareVTI
    An abstract implementation of ResultSet that is useful when writing table functions, read-only VTIs (virtual table interface), and the ResultSets returned by executeQuery in read-write VTI classes. This class implements most of the methods of the JDBC 4.0 interface java.sql.ResultSet, each one throwing a SQLException with the name of the method. A concrete subclass can then just implement the methods not implemented here and override any methods it needs to implement for correct functionality.

    The methods not implemented here are

    • next()
    • close()

    For table functions and virtual tables, the database engine only calls methods defined in the JDBC 2.0 definition of java.sql.ResultSet.