grailsIDmappingwithString.groovy

class CurrentCongestion {
	String id
	Date datatime
	String congestionLevel
	static mapping = {  
		table "chiangmai.current_congestion"  
	   	version false

	   	columns {	
				id column: 'sensor_group_id', generator: 'assigned', type: 'string' 
 				datatime column:'datatime'																			
				congestionLevel column:'congestion_level'
	   	}
	}
    static constraints = {
    }
}