func (session *Session) Where(query interface{}, args ...interface{}) *Session {
	session.statement.Where(query, args...)
	return session
}
Where provides custom query condition.
package xorm
import "github.com/go-xorm/builder"
func (session *Session) Sql(query string, args ...interface{}) *Session {
	return session.SQL(query, args...)
}
func (session *Session) SQL(query interface{}, args ...interface{}) *Session {
	session.statement.SQL(query, args...)
	return session
}