func (c *ColumnMap) SetTransient(b bool) *ColumnMap {
	c.Transient = b
	return c
}
SetTransient allows you to mark the column as transient. If true
this column will be skipped when SQL statements are generated
package gorp
import "reflect"
type ColumnMap struct {
	ColumnName string
	Transient bool
	Unique bool
	GeneratedIdQuery string
	MaxSize int
	DefaultValue string
	fieldName  string
	gotype     reflect.Type
	isPK       bool
	isAutoIncr bool
	isNotNull  bool
}
func (c *ColumnMap) Rename(colname string) *ColumnMap {
	c.ColumnName = colname
	return c
}