spanner: encourage bind parameters in statements (#273)
spanner: encourage bind parameters in statements (#273)

Use parameter binding in the SQL statement.
GoogleCloudPlatform/golang-samples,danicat/golang-samples,GoogleCloudPlatform/golang-samples,adamyanliev/golang-samples,adamyanliev/golang-samples,adamyanliev/golang-samples,danicat/golang-samples,GoogleCloudPlatform/golang-samples,adamyanliev/golang-samples,danicat/golang-samples