client

type Connection interface {
	Use(dbName string) (err error)
	Execute(sql string, args ...interface{}) (ret [][]interface{}, err error)
	ExecuteAsync(sql string, args ...interface{}) (Future, error)
	BatchInsert(sql string, argsArray [][]interface{}) (err error)
	BatchInsertAsync(sql string, argsArray [][]interface{}) (Future, error)
	Close()
}

type Future interface {
	Get(timeout ...float64) ([][]interface{}, error) // timeout in seconds
}

type RangeArray [][2]interface{}