TransactionSelector

JSON representation

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

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` . }

 { 
 // 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 .