19 function statementSuccessCallback(dbName, statementType)  argument
21     log(dbName + " " + statementType + " statement succeeded");
24 function statementErrorCallback(dbName, statementType, error)  argument
26     log(dbName + " " + statementType + " statement failed: " + error.message);
30 function runTransaction(db, dbName, val)  argument
35                      function(result) { statementSuccessCallback(dbName, "read"); },
36                      function(tx, error) { statementErrorCallback(dbName, "read", error); });
40                      function(result) { statementSuccessCallback(dbName, "write"); },
41                      function(tx, error) { statementErrorCallback(dbName, "write", error); });
44            log(dbName + " transaction failed: " + error.message);
48            log(dbName + " transaction succeeded");