SPI_commit — commit the current transaction
void SPI_commit(void)
   SPI_commit commits the current transaction.  It is
   approximately equivalent to running the SQL
   command COMMIT.  After a transaction is committed, a new
   transaction has to be started
   using SPI_start_transaction before further database
   actions can be executed.
  
   This function can only be executed if the SPI connection has been set as
   nonatomic in the call to SPI_connect_ext.