* @param args the program arguments
*/
public static void main(String[] args) {
// 1. Connect to a database
VFactory factory = new MongoDBVFactory();
VDatabase db = factory.createDatabase();
db.connect("mongomvcc-five-minutes-tutorial");
// Checkout the "master" branch
VBranch master = db.checkout(VConstants.MASTER);
// 2. Put something into the index
VCollection persons = master.getCollection("persons");
Map<String, Object> elvis = factory.createDocument();
elvis.put("name", "Elvis");
elvis.put("age", 3);
persons.insert(elvis);
// insert another person
persons.insert(factory.createDocument("name", "Peter"));
// 3. Commit index to the database
long firstCid = master.commit();
// 4. Read documents from the database
VCursor c = persons.find();
for (Map<String, Object> person : c) {
System.out.print("Person { name: " + person.get("name"));
if (person.containsKey("age")) {
System.out.print(", age: " + person.get("age"));
}
System.out.println(" }");
}
Map<String, Object> elvis2 = persons.findOne(factory.createDocument("name", "Elvis"));
if (elvis2 != null) {
System.out.println("Elvis lives!");
}
// 5. Make another commit
persons.insert(factory.createDocument("name", "Max"));
elvis.put("age", 4);
persons.insert(elvis);
master.commit();
// 6. Checkout a previous version
System.out.println("There are " + persons.find().size() + " persons");
Map<String, Object> elvis3 = persons.findOne(factory.createDocument("name", "Elvis"));
System.out.println("Elvis is now " + elvis3.get("age") + " years old");
VBranch oldMaster = db.checkout(firstCid);
VCollection oldPersons = oldMaster.getCollection("persons");
System.out.println("Previously, there were only " + oldPersons.find().size() + " persons");
Map<String, Object> oldElvis = oldPersons.findOne(factory.createDocument("name", "Elvis"));
System.out.println("Last year, Elvis was " + oldElvis.get("age") + " years old");
// 7. Drop the database
db.drop();
}