func (m *Mapping) FieldColumnName(name string) string {
	field := m.FieldByName(name)
	return fmt.Sprintf("%s.%s", entityTable(m.Name), field.Column())
}
func (m *Mapping) FieldColumnName(name string) string {
	field := m.FieldByName(name)
	return fmt.Sprintf("%s.%s", entityTable(m.Name), field.Column())
}
// FieldColumnName returns the column name of the field with the given name,
// prefixed with the entity's table name.