human
Complete the below
def _raise_if_duplicate_entry_error(integrity_error, engine_name):

    ''''Raise exception if two entries are duplicated.
    In this function will be raised DBDuplicateEntry exception if integrity
    error wrap unique constraint violation.'
    '''
assistant
#Here is the Python program you requested.
    def get_columns_from_uniq_cons_or_name(columns):
        uniqbase = 'uniq_'
        if (not columns.startswith(uniqbase)):
            if (engine_name == 'postgresql'):
                return [columns[(columns.index('_') + 1):columns.rindex('_')]]
            return [columns]
        return columns[len(uniqbase):].split('0')[1:]
    if (engine_name not in ['mysql', 'sqlite', 'postgresql']):
        return
    m = _DUP_KEY_RE_DB[engine_name].match(integrity_error.message)
    if (not m):
        return
    columns = m.group(1)
    if (engine_name == 'sqlite'):
        columns = columns.strip().split(',    ')
    else:
        columns = get_columns_from_uniq_cons_or_name(columns)
    raise exception.DBDuplicateEntry(columns, integrity_error)