DB is interface that defines the functions on a database
type DB interface {
Connect() error
PingContext(ctx context.Context) error
Create() (*db.DB, error)
}
func New(dbType, datasource, caName string, tlsConfig *tls.ClientTLSConfig, csp bccsp.BCCSP, metricsProvider metrics.Provider) (DB, error)
New returns a DB interface for the request database type