TransactionSelector

This message is used to select the transaction in which a sessions.read or sessions.executeSql call runs.

See TransactionOptions for more information about transactions.

JSON representation 
{

  // Union field selector can be only one of the following:
  "singleUse": {
    object (TransactionOptions)
  },
  "id": string,
  "begin": {
    object (TransactionOptions)
  }
  // End of list of possible types for union field selector.
}
Fields
Union field selector. If no fields are set, the default is a single use transaction with strong concurrency. selector can be only one of the following:
singleUse

object (TransactionOptions)

Execute the read or SQL query in a temporary transaction. This is the most efficient way to execute a transaction that consists of a single SQL query.
id

string (bytes format)

Execute the read or SQL query in a previously-started transaction.

A base64-encoded string.
begin

object (TransactionOptions)

Begin a new transaction and execute this read or SQL query in it. The transaction ID of the new transaction is returned in ResultSetMetadata.transaction, which is a Transaction.