String getColumnClassName(int column) throws SQLException
Returns the fully-qualified name of the Java class whose instances are manufactured if the method ResultSet.getObject is called to retrieve a value from the column. ResultSet.getObject may return a subclass of the class returned by this method.
the first column is 1, the second is 2, ...
the fully-qualified name of the class in the Java programming language that would be used by the method ResultSet.getObject to retrieve the value in the specified column. This is the class name used for custom mapping.
SQLException - if a database access error occurs, column is less than 1 or greater than the number of columns or the object has been closed.
For more information, reference JDBC documentation for: ResultSetMetaData.getColumnClassName(int)