41   Transaction* txn = txn_db->BeginTransaction(write_options);  in main()  local
42   assert(txn);  in main()
45   s = txn->Get(read_options, "abc", &value);  in main()
49   s = txn->Put("abc", "xyz");  in main()
65   s = txn->Commit();  in main()
67   delete txn;  in main()
86   txn = txn_db->BeginTransaction(write_options, txn_options);  in main()
88   const Snapshot* snapshot = txn->GetSnapshot();  in main()
96   s = txn->GetForUpdate(read_options, "abc", &value);  in main()
101   s = txn->Commit();  in main()
107   delete txn;  in main()
129   txn = txn_db->BeginTransaction(write_options, txn_options);  in main()
133   s = txn->Get(read_options, "x", &value);  in main()
135   s = txn->Put("x", "x");  in main()
148   txn->SetSnapshot();  in main()
152   s = txn->GetForUpdate(read_options, "y", &value);  in main()
155   txn->Put("y", "y");  in main()
159   s = txn->Commit();  in main()
161   delete txn;  in main()