8.1 Transaction Handling

8.1.1 Processing Warnings

8.1.2 Error Handling

Transactions can be used to group operations into an atomic unit. Either all operations of a transaction succeed when they are committed, or none. It is possible to roll back a transaction as long as it has not been committed.

Transactions can be started in a session using the startTransaction() method, committed with commitTransaction() and cancelled or rolled back with rollbackTransaction(). This is illustrated in the following example. The example assumes that the test schema exists and that the collection my_collection does not exist.

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var mysqlx = require('mysqlx');

// Connect to server
var session = mysqlx.getSession( {
  host: 'localhost', port: 33060,
  user: 'user', password: 'password' } );

// Get the Schema test
var db = session.getSchema('test');

// Create a new collection
var myColl = db.createCollection('my_collection');

// Start a transaction
session.startTransaction();
try {
  myColl.add({name: 'Rohit', age: 18, height: 1.76}).execute();
  myColl.add({name: 'Misaki', age: 24, height: 1.65}).execute();
  myColl.add({name: 'Leon', age: 39, height: 1.9}).execute();

  // Commit the transaction if everything went well
  session.commit();

  print('Data inserted successfully.');
}
catch (err) {
  // Rollback the transaction in case of an error
  session.rollback();

  // Printing the error message
  print('Data could not be inserted: ' + err.message);
}