Let see a simple example of how Groovy calls out the query
import groovy.sql.sql
sql = Sql.newInstance ('jdbc: jtds: sqlserver://serverName/dbName-Class;domain=domainName','username','password','net.sourceforge.jtds.jdbc.driver')
sql.eachRow ('select * from tableName') {print "$it.id--${it.firstName} –" }